From patchwork Wed Mar 2 13:46:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766046 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98BC5C43217 for ; Wed, 2 Mar 2022 13:50:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242480AbiCBNvg (ORCPT ); Wed, 2 Mar 2022 08:51:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58162 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242382AbiCBNvI (ORCPT ); Wed, 2 Mar 2022 08:51:08 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3166CC55A1; Wed, 2 Mar 2022 05:50:25 -0800 (PST) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222Bm7Lw007634; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=DfUt7CUSXuxdJceegAgR/IDVY5F54an8OwIpQOK5YCo=; b=VIfhoyor2mLa0T9xB9NJd5U9yv251Hg0grlhssc4oQkSP2p8F+Vcgnif37P+IVp0M56H I3/8TmqVNii9kflUn4l8+o/6aQt0h/VsLVU9JuKEdzcMIosXYhsncJUBSkf+2cYEo3c9 cNrvru9u6hDgoSiSCDup8jPItsZJuTJ/ndz4Fb5cXOXi6Vt0BPkhcNtDMHvr2lcrGlhn LK6WrDNXrlSKkUDXwunzDQVIbU9T/p0y/F/jO42Q2aYuplT5r0VZLA1PgSiNdkMcwBtE /v09ZR5v90sAdR1o+v+PCrhfjbt0l2j18H6amD+3uZ06iutOK0sznxcChm3Pam/sB9a3 EQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej81ctg9c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:01 +0000 Received: from m0098420.ppops.net (m0098420.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222Dl4OM028772; Wed, 2 Mar 2022 13:50:01 GMT Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej81ctg8v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:01 +0000 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222DmUWO005334; Wed, 2 Mar 2022 13:50:00 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma01dal.us.ibm.com with ESMTP id 3efbuany38-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222Dnvbt34406862 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:57 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F367911206B; Wed, 2 Mar 2022 13:49:56 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D6712112072; Wed, 2 Mar 2022 13:49:56 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:56 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger Subject: [PATCH v11 01/27] ima: Return error code obtained from securityfs functions Date: Wed, 2 Mar 2022 08:46:36 -0500 Message-Id: <20220302134703.1273041-2-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ZA7KyhWiC5plxNC9yEeSGwyxqR9gUeuZ X-Proofpoint-ORIG-GUID: HZUET_dK2ZcyAN__v1fPs-2tr8DE_TCH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 malwarescore=0 priorityscore=1501 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: If an error occurs when creating a securityfs file, return the exact error code to the caller. Signed-off-by: Stefan Berger Reviewed-by: Mimi Zohar --- security/integrity/ima/ima_fs.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 3ad8f7734208..cd1683dad3bf 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -452,47 +452,61 @@ static const struct file_operations ima_measure_policy_ops = { int __init ima_fs_init(void) { + int ret; + ima_dir = securityfs_create_dir("ima", integrity_dir); if (IS_ERR(ima_dir)) - return -1; + return PTR_ERR(ima_dir); ima_symlink = securityfs_create_symlink("ima", NULL, "integrity/ima", NULL); - if (IS_ERR(ima_symlink)) + if (IS_ERR(ima_symlink)) { + ret = PTR_ERR(ima_symlink); goto out; + } binary_runtime_measurements = securityfs_create_file("binary_runtime_measurements", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_measurements_ops); - if (IS_ERR(binary_runtime_measurements)) + if (IS_ERR(binary_runtime_measurements)) { + ret = PTR_ERR(binary_runtime_measurements); goto out; + } ascii_runtime_measurements = securityfs_create_file("ascii_runtime_measurements", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_ascii_measurements_ops); - if (IS_ERR(ascii_runtime_measurements)) + if (IS_ERR(ascii_runtime_measurements)) { + ret = PTR_ERR(ascii_runtime_measurements); goto out; + } runtime_measurements_count = securityfs_create_file("runtime_measurements_count", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_measurements_count_ops); - if (IS_ERR(runtime_measurements_count)) + if (IS_ERR(runtime_measurements_count)) { + ret = PTR_ERR(runtime_measurements_count); goto out; + } violations = securityfs_create_file("violations", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_htable_violations_ops); - if (IS_ERR(violations)) + if (IS_ERR(violations)) { + ret = PTR_ERR(violations); goto out; + } ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS, ima_dir, NULL, &ima_measure_policy_ops); - if (IS_ERR(ima_policy)) + if (IS_ERR(ima_policy)) { + ret = PTR_ERR(ima_policy); goto out; + } return 0; out: @@ -503,5 +517,6 @@ int __init ima_fs_init(void) securityfs_remove(binary_runtime_measurements); securityfs_remove(ima_symlink); securityfs_remove(ima_dir); - return -1; + + return ret; } From patchwork Wed Mar 2 13:46:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766057 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4C23C4332F for ; Wed, 2 Mar 2022 13:51:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237447AbiCBNvq (ORCPT ); Wed, 2 Mar 2022 08:51:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242454AbiCBNv3 (ORCPT ); Wed, 2 Mar 2022 08:51:29 -0500 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C61BC5DAB; Wed, 2 Mar 2022 05:50:33 -0800 (PST) Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222BSfua031088; Wed, 2 Mar 2022 13:50:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=cUJtAy4PX1MvoaW5WNjcTOGS64qH4Yh6n8vvHnHPMnE=; b=Jx8HcJZzuw2LkWn2v9LqATQaSyQIqjoBEF2LnjJlSbtKNA99TLcuxfTWvBiIbwqxmE7S NqrWx39JEIsoo8TCwAYDaLVvlHIXBGmgIDU5UXMv6UlrWYcq8DXdPsc792jzhwPUPkr9 tGZHrUt968ZqigIUhqfXURcsji0v+TWd+dH8n9DRFFz4LJmcYdByV6mjNLxQcE0N36Op jci9VWlgAVPszEZhWA3oRm8ZUyrB8Q2Tsb8cCMStDFiTHDuu5V3rk+N8qXOhnrvB884B RNJRgHcAO6Nw6+LQozCKHrV+NTpGcZLd7bd9VurrLTHQQd0G9xnvP9TlRM8SjDkDGfSN eQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej5ccf5ws-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from m0127361.ppops.net (m0127361.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DarBv036610; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej5ccf5wb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222Dn40K026692; Wed, 2 Mar 2022 13:49:58 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma03dal.us.ibm.com with ESMTP id 3egfsscpng-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:58 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnvOu34537746 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:57 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2506811206B; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 05B6F112070; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:56 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Christian Brauner , John Johansen , Matthew Garrett , Micah Morton , Kentaro Takeda , Jarkko Sakkinen , Stefan Berger Subject: [PATCH v11 02/27] securityfs: rework dentry creation Date: Wed, 2 Mar 2022 08:46:37 -0500 Message-Id: <20220302134703.1273041-3-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 7iHcLZnClTqAWEiwtj0xPtzpQCLZumEL X-Proofpoint-GUID: nsPHtg-QajQ9hhoSY61B64-fLdXhOpSX X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 phishscore=0 clxscore=1011 bulkscore=0 mlxlogscore=999 adultscore=0 mlxscore=0 priorityscore=1501 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: From: Christian Brauner When securityfs creates a new file or directory via securityfs_create_dentry() it will take an additional reference on the newly created dentry after it has attached the new inode to the new dentry and added it to the hashqueues. If we contrast this with debugfs which has the same underlying logic as securityfs. It uses a similar pairing as securityfs. Where securityfs has the securityfs_create_dentry() and securityfs_remove() pairing, debugfs has the __debugfs_create_file() and debugfs_remove() pairing. In contrast to securityfs, debugfs doesn't take an additional reference on the newly created dentry in __debugfs_create_file() which would need to be put in debugfs_remove(). The additional dget() isn't a problem per se. In the current implementation of securityfs each created dentry pins the filesystem via until it is removed. Since it is virtually guaranteed that there is at least one user of securityfs that has created dentries the initial securityfs mount cannot go away until all dentries have been removed. Since most of the users of the initial securityfs mount don't go away until the system is shutdown the initial securityfs won't go away when unmounted. Instead a mount will usually surface the same superblock as before. The additional dget() doesn't matter in this scenario since it is required that all dentries have been cleaned up by the respective users before the superblock can be destroyed, i.e. superblock shutdown is tied to the lifetime of the associated dentries. However, in order to support ima namespaces we need to extend securityfs to support being mounted outside of the initial user namespace. For namespaced users the pinning logic doesn't make sense. Whereas in the initial namespace the securityfs instance and the associated data structures of its users can't go away for reason explained earlier users of non-initial securityfs instances do go away when the last users of the namespace are gone. So for those users we neither want to duplicate the pinning logic nor make the global securityfs instance display different information based on the namespace. Both options would be really messy and hacky. Instead we will simply give each namespace its own securityfs instance similar to how each ipc namespace has its own mqueue instance and all entries in there are cleaned up on umount or when the last user of the associated namespace is gone. This means that the superblock's lifetime isn't tied to the dentries. Instead the last umount, without any fds kept open, will trigger a clean shutdown. But now the additional dget() gets in the way. Instead of being able to rely on the generic superblock shutdown logic we would need to drop the additional dentry reference during superblock shutdown for all associated users. That would force the use of a generic coordination mechanism for current and future users of securityfs which is unnecessary. Simply remove the additional dget() in securityfs_dentry_create(). In securityfs_remove() we will call dget() to take an additional reference on the dentry about to be removed. After simple_unlink() or simple_rmdir() have dropped the dentry refcount we can call d_delete() which will either turn the dentry into negative dentry if our earlier dget() is the only reference to the dentry, i.e. it has no other users, or remove it from the hashqueues in case there are additional users. All of these changes should not have any effect on the userspace semantics of the initial securityfs mount. Signed-off-by: Christian Brauner Cc: John Johansen Cc: Matthew Garrett Cc: Micah Morton Cc: Kentaro Takeda Cc: James Morris Cc: Jarkko Sakkinen Signed-off-by: Stefan Berger Reviewed-by: Mimi Zohar --- security/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/inode.c b/security/inode.c index 6c326939750d..13e6780c4444 100644 --- a/security/inode.c +++ b/security/inode.c @@ -159,7 +159,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, inode->i_fop = fops; } d_instantiate(dentry, inode); - dget(dentry); inode_unlock(dir); return dentry; @@ -302,10 +301,12 @@ void securityfs_remove(struct dentry *dentry) dir = d_inode(dentry->d_parent); inode_lock(dir); if (simple_positive(dentry)) { + dget(dentry); if (d_is_dir(dentry)) simple_rmdir(dir, dentry); else simple_unlink(dir, dentry); + d_delete(dentry); dput(dentry); } inode_unlock(dir); From patchwork Wed Mar 2 13:46:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766056 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C839CC4321E for ; Wed, 2 Mar 2022 13:51:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242264AbiCBNvp (ORCPT ); Wed, 2 Mar 2022 08:51:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242439AbiCBNv2 (ORCPT ); Wed, 2 Mar 2022 08:51:28 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 346A4C5D8A; Wed, 2 Mar 2022 05:50:30 -0800 (PST) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222Bm619007624; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=tD2KDm69mKJLTpIzvWk3XCQ248a8+6+3r1o2QpnCBqo=; b=CwT3pMnEtTUtKEkmPz2dviMWhmG7QNIbFjTHi65YiQuZ8e/Gqj+VWSfGmT5hc12cE8Xr U3fdpiHYlc5SzTT7nHgq/Ya5pXeYLfhU1slb5lwoqsz646dkLT94qKhbVq5eCikI9Vfg ++9NRIFBAJKTdsCen1WX88RcBmhZ7anbiZO6Y5weFrKVfqmrcGH5V+22LqgEpj4QV01R CcGrUFsoEZA/X8NXZGVuEwzw6Xz+fye7Tla6nQ3Tp2NuILXXUb5cciLGdh20qrNjmQbL VsMNuTIhAw6GetVESCGKmRSQP1d9hJ03TIvDPGtFhJ8DqKm8purRqU6i/Prrld8TYtBy jg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej81ctg8g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from m0098420.ppops.net (m0098420.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DHgbG020392; Wed, 2 Mar 2022 13:49:59 GMT Received: from ppma03wdc.us.ibm.com (ba.79.3fa9.ip4.static.sl-reverse.com [169.63.121.186]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej81ctg8a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from pps.filterd (ppma03wdc.us.ibm.com [127.0.0.1]) by ppma03wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222DnBle031307; Wed, 2 Mar 2022 13:49:58 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma03wdc.us.ibm.com with ESMTP id 3efbua4v0a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:58 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnvI534406870 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:57 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4B1A711206B; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2AEE1112071; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger , Christian Brauner , James Bottomley Subject: [PATCH v11 03/27] securityfs: Extend securityfs with namespacing support Date: Wed, 2 Mar 2022 08:46:38 -0500 Message-Id: <20220302134703.1273041-4-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: dtmU1og7Ju4x0CXW8yxuxKmGsU8VuBtd X-Proofpoint-ORIG-GUID: BAdPhe8QViInYquiLulYHxVaKc_SZKLJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 malwarescore=0 priorityscore=1501 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Enable multiple instances of securityfs by keying each instance with a pointer to the user namespace it belongs to. Since we do not need the pinning of the filesystem for the virtualization case, limit the usage of simple_pin_fs() and simpe_release_fs() to the case when the init_user_ns is active. This simplifies the cleanup for the virtualization case where usage of securityfs_remove() to free dentries is therefore not needed anymore. For the initial securityfs, i.e. the one mounted in the host userns mount, nothing changes. The rules for securityfs_remove() are as before and it is still paired with securityfs_create(). Specifically, a file created via securityfs_create_dentry() in the initial securityfs mount still needs to be removed by a call to securityfs_remove(). Creating a new dentry in the initial securityfs mount still pins the filesystem like it always did. Consequently, the initial securityfs mount is not destroyed on umount/shutdown as long as at least one user of it still has dentries that it hasn't removed with a call to securityfs_remove(). Prevent mounting of an instance of securityfs in another user namespace than it belongs to. Also, prevent accesses to files and directories by a user namespace that is neither the user namespace it belongs to nor an ancestor of the user namespace that the instance of securityfs belongs to. Do not prevent access if securityfs was bind-mounted and therefore the init_user_ns is the owning user namespace. Suggested-by: Christian Brauner Signed-off-by: Stefan Berger Signed-off-by: James Bottomley --- security/inode.c | 72 ++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 61 insertions(+), 11 deletions(-) diff --git a/security/inode.c b/security/inode.c index 13e6780c4444..e525ba960063 100644 --- a/security/inode.c +++ b/security/inode.c @@ -21,9 +21,37 @@ #include #include #include +#include -static struct vfsmount *mount; -static int mount_count; +static struct vfsmount *init_securityfs_mount; +static int init_securityfs_mount_count; + +static int securityfs_permission(struct user_namespace *mnt_userns, + struct inode *inode, int mask) +{ + int err; + + err = generic_permission(&init_user_ns, inode, mask); + if (!err) { + /* Unless bind-mounted, deny access if current_user_ns() is not + * ancestor. + */ + if (inode->i_sb->s_user_ns != &init_user_ns && + !in_userns(current_user_ns(), inode->i_sb->s_user_ns)) + err = -EACCES; + } + + return err; +} + +static const struct inode_operations securityfs_dir_inode_operations = { + .permission = securityfs_permission, + .lookup = simple_lookup, +}; + +static const struct inode_operations securityfs_file_inode_operations = { + .permission = securityfs_permission, +}; static void securityfs_free_inode(struct inode *inode) { @@ -40,20 +68,25 @@ static const struct super_operations securityfs_super_operations = { static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc) { static const struct tree_descr files[] = {{""}}; + struct user_namespace *ns = fc->user_ns; int error; + if (WARN_ON(ns != current_user_ns())) + return -EINVAL; + error = simple_fill_super(sb, SECURITYFS_MAGIC, files); if (error) return error; sb->s_op = &securityfs_super_operations; + sb->s_root->d_inode->i_op = &securityfs_dir_inode_operations; return 0; } static int securityfs_get_tree(struct fs_context *fc) { - return get_tree_single(fc, securityfs_fill_super); + return get_tree_keyed(fc, securityfs_fill_super, fc->user_ns); } static const struct fs_context_operations securityfs_context_ops = { @@ -71,6 +104,7 @@ static struct file_system_type fs_type = { .name = "securityfs", .init_fs_context = securityfs_init_fs_context, .kill_sb = kill_litter_super, + .fs_flags = FS_USERNS_MOUNT, }; /** @@ -109,6 +143,7 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, const struct file_operations *fops, const struct inode_operations *iops) { + struct user_namespace *ns = current_user_ns(); struct dentry *dentry; struct inode *dir, *inode; int error; @@ -118,12 +153,19 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, pr_debug("securityfs: creating file '%s'\n",name); - error = simple_pin_fs(&fs_type, &mount, &mount_count); - if (error) - return ERR_PTR(error); + if (ns == &init_user_ns) { + error = simple_pin_fs(&fs_type, &init_securityfs_mount, + &init_securityfs_mount_count); + if (error) + return ERR_PTR(error); + } - if (!parent) - parent = mount->mnt_root; + if (!parent) { + if (ns == &init_user_ns) + parent = init_securityfs_mount->mnt_root; + else + return ERR_PTR(-EINVAL); + } dir = d_inode(parent); @@ -148,7 +190,7 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); inode->i_private = data; if (S_ISDIR(mode)) { - inode->i_op = &simple_dir_inode_operations; + inode->i_op = &securityfs_dir_inode_operations; inode->i_fop = &simple_dir_operations; inc_nlink(inode); inc_nlink(dir); @@ -156,6 +198,7 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, inode->i_op = iops ? iops : &simple_symlink_inode_operations; inode->i_link = data; } else { + inode->i_op = &securityfs_file_inode_operations; inode->i_fop = fops; } d_instantiate(dentry, inode); @@ -167,7 +210,9 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, dentry = ERR_PTR(error); out: inode_unlock(dir); - simple_release_fs(&mount, &mount_count); + if (ns == &init_user_ns) + simple_release_fs(&init_securityfs_mount, + &init_securityfs_mount_count); return dentry; } @@ -293,11 +338,14 @@ EXPORT_SYMBOL_GPL(securityfs_create_symlink); */ void securityfs_remove(struct dentry *dentry) { + struct user_namespace *ns; struct inode *dir; if (!dentry || IS_ERR(dentry)) return; + ns = dentry->d_sb->s_user_ns; + dir = d_inode(dentry->d_parent); inode_lock(dir); if (simple_positive(dentry)) { @@ -310,7 +358,9 @@ void securityfs_remove(struct dentry *dentry) dput(dentry); } inode_unlock(dir); - simple_release_fs(&mount, &mount_count); + if (ns == &init_user_ns) + simple_release_fs(&init_securityfs_mount, + &init_securityfs_mount_count); } EXPORT_SYMBOL_GPL(securityfs_remove); From patchwork Wed Mar 2 13:46:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766058 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1AD77C433EF for ; Wed, 2 Mar 2022 13:51:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242575AbiCBNvu (ORCPT ); Wed, 2 Mar 2022 08:51:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242510AbiCBNvh (ORCPT ); Wed, 2 Mar 2022 08:51:37 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B785C5DAD; Wed, 2 Mar 2022 05:50:37 -0800 (PST) Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222Cs6Xv032084; Wed, 2 Mar 2022 13:50:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=k9vH2ljTPG8FyL2MC6FnF8Yqo37LXwgVy3dKVjr63mU=; b=Akfh6/WLDDmI4gMNTky7XMnDpNL3wmuzBXmdOf/IB2KtFeWeiyqbARiQ7Uuhk+bfdPXe JwaX2MUKrB/dfXg/4z6zzVPYZ3iX5ITdSp93YX8B7DYNW3xa1OV1c2+gsY5oawXQpwzb fgLA2Gja4GZ/RiGzk75GITMZLJeFb7e5XRdYcun7wbYevXD/qODol/TN0GxX2tIyfVkU caQxFbsEIf5+3TABABM48w2lAeBXyCKjplhMNDzhXOR0rUL0WhpdNtfFU2qXPQy6xjRb McUL+lNsqXTDTRazdMifw+fT47nBMiPu4WW524e4p/1sTThLP2HQSPlX7nSDJwRrwJtf 6w== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej90as4j8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from m0098416.ppops.net (m0098416.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DYSwD026369; Wed, 2 Mar 2022 13:49:59 GMT Received: from ppma01wdc.us.ibm.com (fd.55.37a9.ip4.static.sl-reverse.com [169.55.85.253]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej90as4hy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from pps.filterd (ppma01wdc.us.ibm.com [127.0.0.1]) by ppma01wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222DmaGZ013694; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma01wdc.us.ibm.com with ESMTP id 3efbu9vt88-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:58 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnvCu34210072 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:57 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7B048112073; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 531A2112075; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger , Christian Brauner Subject: [PATCH v11 04/27] ima: Define ima_namespace struct and start moving variables into it Date: Wed, 2 Mar 2022 08:46:39 -0500 Message-Id: <20220302134703.1273041-5-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: QlDy8ditp8tJFuPq3uEdtC1ZnWTASd1m X-Proofpoint-GUID: Cn_En4NjawhwYNJOdOuX_Ya-PT2p5sMg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 phishscore=0 clxscore=1015 mlxlogscore=999 lowpriorityscore=0 spamscore=0 adultscore=0 bulkscore=0 suspectscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Define the ima_namespace structure and the ima_namespace variable init_ima_ns for the host's IMA namespace. Implement the basic functions ima_ns_init() and ima_init_namespace() for namespacing support. Move variables related to the IMA policy into the ima_namespace. This way the IMA policy of an IMA namespace can be set and displayed using a front-end like securityfs. In preparation for IMA namespacing, update the existing functions to pass the ima_namespace struct. For now, use &init_ima_ns as the current ima_namespace when a function that is related to a policy rule is called. Signed-off-by: Stefan Berger Acked-by: Christian Brauner Reviewed-by: Mimi Zohar --- v11: - Updated commit text - Added comments to some fields in the ima_namespace struct v9: - squashed patched 2 and 3 of v8 - ima_post_read_file: only access ima_appraise in case of init_ima_ns --- security/integrity/ima/Makefile | 2 +- security/integrity/ima/ima.h | 53 ++++--- security/integrity/ima/ima_api.c | 8 +- security/integrity/ima/ima_appraise.c | 28 ++-- security/integrity/ima/ima_asymmetric_keys.c | 4 +- security/integrity/ima/ima_fs.c | 16 ++- security/integrity/ima/ima_init.c | 12 +- security/integrity/ima/ima_init_ima_ns.c | 29 ++++ security/integrity/ima/ima_main.c | 87 +++++++----- security/integrity/ima/ima_policy.c | 142 ++++++++++--------- security/integrity/ima/ima_queue_keys.c | 11 +- 11 files changed, 248 insertions(+), 144 deletions(-) create mode 100644 security/integrity/ima/ima_init_ima_ns.c diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile index 2499f2485c04..f8a5e5f3975d 100644 --- a/security/integrity/ima/Makefile +++ b/security/integrity/ima/Makefile @@ -7,7 +7,7 @@ obj-$(CONFIG_IMA) += ima.o ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \ - ima_policy.o ima_template.o ima_template_lib.o + ima_policy.o ima_template.o ima_template_lib.o ima_init_ima_ns.o ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index be965a8715e4..9bcde1a24e74 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -20,6 +20,7 @@ #include #include #include +#include #include #include "../integrity.h" @@ -43,9 +44,6 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 }; #define NR_BANKS(chip) ((chip != NULL) ? chip->nr_allocated_banks : 0) -/* current content of the policy */ -extern int ima_policy_flag; - /* bitset of digests algorithms allowed in the setxattr hook */ extern atomic_t ima_setxattr_allowed_hash_algorithms; @@ -119,6 +117,17 @@ struct ima_kexec_hdr { u64 count; }; +struct ima_namespace { + /* policy rules */ + struct list_head ima_default_rules; /* Kconfig, builtin & arch rules */ + struct list_head ima_policy_rules; /* arch & custom rules */ + struct list_head ima_temp_rules; + + struct list_head __rcu *ima_rules; /* Pointer to the current policy */ + int ima_policy_flag; +} __randomize_layout; +extern struct ima_namespace init_ima_ns; + extern const int read_idmap[]; #ifdef CONFIG_HAVE_IMA_KEXEC @@ -136,6 +145,7 @@ extern bool ima_canonical_fmt; /* Internal IMA function definitions */ int ima_init(void); int ima_fs_init(void); +int ima_ns_init(void); int ima_add_template_entry(struct ima_template_entry *entry, int violation, const char *op, struct inode *inode, const unsigned char *filename); @@ -243,18 +253,19 @@ void ima_init_key_queue(void); bool ima_should_queue_key(void); bool ima_queue_key(struct key *keyring, const void *payload, size_t payload_len); -void ima_process_queued_keys(void); +void ima_process_queued_keys(struct ima_namespace *ns); #else static inline void ima_init_key_queue(void) {} static inline bool ima_should_queue_key(void) { return false; } static inline bool ima_queue_key(struct key *keyring, const void *payload, size_t payload_len) { return false; } -static inline void ima_process_queued_keys(void) {} +static inline void ima_process_queued_keys(struct ima_namespace *ns) {} #endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */ /* LIM API function definitions */ -int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, +int ima_get_action(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, const struct cred *cred, u32 secid, int mask, enum ima_hooks func, int *pcr, struct ima_template_desc **template_desc, @@ -268,7 +279,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, int pcr, struct ima_template_desc *template_desc); -int process_buffer_measurement(struct user_namespace *mnt_userns, +int process_buffer_measurement(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, const void *buf, int size, const char *eventname, enum ima_hooks func, int pcr, const char *func_data, @@ -285,17 +297,18 @@ void ima_free_template_entry(struct ima_template_entry *entry); const char *ima_d_path(const struct path *path, char **pathbuf, char *filename); /* IMA policy related functions */ -int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, +int ima_match_policy(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, const struct cred *cred, u32 secid, enum ima_hooks func, int mask, int flags, int *pcr, struct ima_template_desc **template_desc, const char *func_data, unsigned int *allowed_algos); -void ima_init_policy(void); -void ima_update_policy(void); -void ima_update_policy_flags(void); -ssize_t ima_parse_add_rule(char *); -void ima_delete_rules(void); -int ima_check_policy(void); +void ima_init_policy(struct ima_namespace *ns); +void ima_update_policy(struct ima_namespace *ns); +void ima_update_policy_flags(struct ima_namespace *ns); +ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule); +void ima_delete_rules(struct ima_namespace *ns); +int ima_check_policy(struct ima_namespace *ns); void *ima_policy_start(struct seq_file *m, loff_t *pos); void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos); void ima_policy_stop(struct seq_file *m, void *v); @@ -311,14 +324,16 @@ int ima_policy_show(struct seq_file *m, void *v); #define IMA_APPRAISE_KEXEC 0x40 #ifdef CONFIG_IMA_APPRAISE -int ima_check_blacklist(struct integrity_iint_cache *iint, +int ima_check_blacklist(struct ima_namespace *ns, + struct integrity_iint_cache *iint, const struct modsig *modsig, int pcr); int ima_appraise_measurement(enum ima_hooks func, struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig); -int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode, +int ima_must_appraise(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, int mask, enum ima_hooks func); void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, @@ -329,7 +344,8 @@ int ima_read_xattr(struct dentry *dentry, struct evm_ima_xattr_data **xattr_value); #else -static inline int ima_check_blacklist(struct integrity_iint_cache *iint, +static inline int ima_check_blacklist(struct ima_namespace *ns, + struct integrity_iint_cache *iint, const struct modsig *modsig, int pcr) { return 0; @@ -346,7 +362,8 @@ static inline int ima_appraise_measurement(enum ima_hooks func, return INTEGRITY_UNKNOWN; } -static inline int ima_must_appraise(struct user_namespace *mnt_userns, +static inline int ima_must_appraise(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, int mask, enum ima_hooks func) { diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index a64fb0130b01..2df0d8549c13 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -162,6 +162,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename, /** * ima_get_action - appraise & measure decision based on policy. + * @ns: IMA namespace that has the policy * @mnt_userns: user namespace of the mount the inode was found from * @inode: pointer to the inode associated with the object being validated * @cred: pointer to credentials structure to validate @@ -185,7 +186,8 @@ void ima_add_violation(struct file *file, const unsigned char *filename, * Returns IMA_MEASURE, IMA_APPRAISE mask. * */ -int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, +int ima_get_action(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, const struct cred *cred, u32 secid, int mask, enum ima_hooks func, int *pcr, struct ima_template_desc **template_desc, @@ -193,9 +195,9 @@ int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, { int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH; - flags &= ima_policy_flag; + flags &= ns->ima_policy_flag; - return ima_match_policy(mnt_userns, inode, cred, secid, func, mask, + return ima_match_policy(ns, mnt_userns, inode, cred, secid, func, mask, flags, pcr, template_desc, func_data, allowed_algos); } diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 17232bbfb9f9..f1b99b895c68 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -68,7 +68,8 @@ bool is_ima_appraise_enabled(void) * * Return 1 to appraise or hash */ -int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode, +int ima_must_appraise(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, int mask, enum ima_hooks func) { u32 secid; @@ -77,7 +78,7 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode, return 0; security_current_getsecid_subj(&secid); - return ima_match_policy(mnt_userns, inode, current_cred(), secid, + return ima_match_policy(ns, mnt_userns, inode, current_cred(), secid, func, mask, IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL, NULL); } @@ -341,7 +342,8 @@ static int modsig_verify(enum ima_hooks func, const struct modsig *modsig, * * Returns -EPERM if the hash is blacklisted. */ -int ima_check_blacklist(struct integrity_iint_cache *iint, +int ima_check_blacklist(struct ima_namespace *ns, + struct integrity_iint_cache *iint, const struct modsig *modsig, int pcr) { enum hash_algo hash_algo; @@ -357,7 +359,8 @@ int ima_check_blacklist(struct integrity_iint_cache *iint, rc = is_binary_blacklisted(digest, digestsize); if ((rc == -EPERM) && (iint->flags & IMA_MEASURE)) - process_buffer_measurement(&init_user_ns, NULL, digest, digestsize, + process_buffer_measurement(ns, &init_user_ns, NULL, + digest, digestsize, "blacklisted-hash", NONE, pcr, NULL, false, NULL, 0); } @@ -527,14 +530,16 @@ void ima_inode_post_setattr(struct user_namespace *mnt_userns, struct dentry *dentry) { struct inode *inode = d_backing_inode(dentry); + struct ima_namespace *ns = &init_ima_ns; struct integrity_iint_cache *iint; int action; - if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode) + if (!(ns->ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode) || !(inode->i_opflags & IOP_XATTR)) return; - action = ima_must_appraise(mnt_userns, inode, MAY_ACCESS, POST_SETATTR); + action = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS, + POST_SETATTR); iint = integrity_iint_find(inode); if (iint) { set_bit(IMA_CHANGE_ATTR, &iint->atomic_flags); @@ -559,11 +564,12 @@ static int ima_protect_xattr(struct dentry *dentry, const char *xattr_name, return 0; } -static void ima_reset_appraise_flags(struct inode *inode, int digsig) +static void ima_reset_appraise_flags(struct ima_namespace *ns, + struct inode *inode, int digsig) { struct integrity_iint_cache *iint; - if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)) + if (!(ns->ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)) return; iint = integrity_iint_find(inode); @@ -641,6 +647,7 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len) { const struct evm_ima_xattr_data *xvalue = xattr_value; + struct ima_namespace *ns = &init_ima_ns; int digsig = 0; int result; @@ -658,18 +665,19 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, if (result) return result; - ima_reset_appraise_flags(d_backing_inode(dentry), digsig); + ima_reset_appraise_flags(ns, d_backing_inode(dentry), digsig); } return result; } int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name) { + struct ima_namespace *ns = &init_ima_ns; int result; result = ima_protect_xattr(dentry, xattr_name, NULL, 0); if (result == 1 || evm_revalidate_status(xattr_name)) { - ima_reset_appraise_flags(d_backing_inode(dentry), 0); + ima_reset_appraise_flags(ns, d_backing_inode(dentry), 0); if (result == 1) result = 0; } diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c index f6aa0b47a772..70d87df26068 100644 --- a/security/integrity/ima/ima_asymmetric_keys.c +++ b/security/integrity/ima/ima_asymmetric_keys.c @@ -30,6 +30,7 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key, const void *payload, size_t payload_len, unsigned long flags, bool create) { + struct ima_namespace *ns = &init_ima_ns; bool queued = false; /* Only asymmetric keys are handled by this hook. */ @@ -60,7 +61,8 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key, * if the IMA policy is configured to measure a key linked * to the given keyring. */ - process_buffer_measurement(&init_user_ns, NULL, payload, payload_len, + process_buffer_measurement(ns, &init_user_ns, NULL, + payload, payload_len, keyring->description, KEY_CHECK, 0, keyring->description, false, NULL, 0); } diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index cd1683dad3bf..f7ad93a56982 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -271,7 +271,7 @@ static const struct file_operations ima_ascii_measurements_ops = { .release = seq_release, }; -static ssize_t ima_read_policy(char *path) +static ssize_t ima_read_policy(struct ima_namespace *ns, char *path) { void *data = NULL; char *datap; @@ -296,7 +296,7 @@ static ssize_t ima_read_policy(char *path) datap = data; while (size > 0 && (p = strsep(&datap, "\n"))) { pr_debug("rule: %s\n", p); - rc = ima_parse_add_rule(p); + rc = ima_parse_add_rule(ns, p); if (rc < 0) break; size -= rc; @@ -314,6 +314,7 @@ static ssize_t ima_read_policy(char *path) static ssize_t ima_write_policy(struct file *file, const char __user *buf, size_t datalen, loff_t *ppos) { + struct ima_namespace *ns = &init_ima_ns; char *data; ssize_t result; @@ -336,7 +337,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, goto out_free; if (data[0] == '/') { - result = ima_read_policy(data); + result = ima_read_policy(ns, data); } else if (ima_appraise & IMA_APPRAISE_POLICY) { pr_err("signed policy file (specified as an absolute pathname) required\n"); integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, @@ -344,7 +345,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, 1, 0); result = -EACCES; } else { - result = ima_parse_add_rule(data); + result = ima_parse_add_rule(ns, data); } mutex_unlock(&ima_write_mutex); out_free: @@ -410,11 +411,12 @@ static int ima_open_policy(struct inode *inode, struct file *filp) static int ima_release_policy(struct inode *inode, struct file *file) { const char *cause = valid_policy ? "completed" : "failed"; + struct ima_namespace *ns = &init_ima_ns; if ((file->f_flags & O_ACCMODE) == O_RDONLY) return seq_release(inode, file); - if (valid_policy && ima_check_policy() < 0) { + if (valid_policy && ima_check_policy(ns) < 0) { cause = "failed"; valid_policy = 0; } @@ -424,13 +426,13 @@ static int ima_release_policy(struct inode *inode, struct file *file) "policy_update", cause, !valid_policy, 0); if (!valid_policy) { - ima_delete_rules(); + ima_delete_rules(ns); valid_policy = 1; clear_bit(IMA_FS_BUSY, &ima_fs_flags); return 0; } - ima_update_policy(); + ima_update_policy(ns); #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY) securityfs_remove(ima_policy); ima_policy = NULL; diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index b26fa67476b4..d6b829c360d7 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -104,15 +104,15 @@ static int __init ima_add_boot_aggregate(void) #ifdef CONFIG_IMA_LOAD_X509 void __init ima_load_x509(void) { - int unset_flags = ima_policy_flag & IMA_APPRAISE; + int unset_flags = init_ima_ns.ima_policy_flag & IMA_APPRAISE; - ima_policy_flag &= ~unset_flags; + init_ima_ns.ima_policy_flag &= ~unset_flags; integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH); /* load also EVM key to avoid appraisal */ evm_load_x509(); - ima_policy_flag |= unset_flags; + init_ima_ns.ima_policy_flag |= unset_flags; } #endif @@ -120,6 +120,10 @@ int __init ima_init(void) { int rc; + rc = ima_ns_init(); + if (rc) + return rc; + ima_tpm_chip = tpm_default_chip(); if (!ima_tpm_chip) pr_info("No TPM chip found, activating TPM-bypass!\n"); @@ -145,7 +149,7 @@ int __init ima_init(void) if (rc != 0) return rc; - ima_init_policy(); + ima_init_policy(&init_ima_ns); rc = ima_fs_init(); if (rc != 0) diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c new file mode 100644 index 000000000000..c919a456b525 --- /dev/null +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2016-2022 IBM Corporation + * Author: + * Yuqiong Sun + * Stefan Berger + */ + +#include "ima.h" + +static int ima_init_namespace(struct ima_namespace *ns) +{ + INIT_LIST_HEAD(&ns->ima_default_rules); + INIT_LIST_HEAD(&ns->ima_policy_rules); + INIT_LIST_HEAD(&ns->ima_temp_rules); + ns->ima_rules = (struct list_head __rcu *)(&ns->ima_default_rules); + ns->ima_policy_flag = 0; + + return 0; +} + +int __init ima_ns_init(void) +{ + return ima_init_namespace(&init_ima_ns); +} + +struct ima_namespace init_ima_ns = { +}; +EXPORT_SYMBOL(init_ima_ns); diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 8c6e4514d494..9dc48ea216a5 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -185,10 +185,11 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint, */ void ima_file_free(struct file *file) { + struct ima_namespace *ns = &init_ima_ns; struct inode *inode = file_inode(file); struct integrity_iint_cache *iint; - if (!ima_policy_flag || !S_ISREG(inode->i_mode)) + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode)) return; iint = integrity_iint_find(inode); @@ -198,7 +199,8 @@ void ima_file_free(struct file *file) ima_check_last_writer(iint, inode, file); } -static int process_measurement(struct file *file, const struct cred *cred, +static int process_measurement(struct ima_namespace *ns, + struct file *file, const struct cred *cred, u32 secid, char *buf, loff_t size, int mask, enum ima_hooks func) { @@ -217,18 +219,18 @@ static int process_measurement(struct file *file, const struct cred *cred, enum hash_algo hash_algo; unsigned int allowed_algos = 0; - if (!ima_policy_flag || !S_ISREG(inode->i_mode)) + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode)) return 0; /* Return an IMA_MEASURE, IMA_APPRAISE, IMA_AUDIT action * bitmask based on the appraise/audit/measurement policy. * Included is the appraise submask. */ - action = ima_get_action(file_mnt_user_ns(file), inode, cred, secid, + action = ima_get_action(ns, file_mnt_user_ns(file), inode, cred, secid, mask, func, &pcr, &template_desc, NULL, &allowed_algos); violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) && - (ima_policy_flag & IMA_MEASURE)); + (ns->ima_policy_flag & IMA_MEASURE)); if (!action && !violation_check) return 0; @@ -346,7 +348,7 @@ static int process_measurement(struct file *file, const struct cred *cred, xattr_value, xattr_len, modsig, pcr, template_desc); if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) { - rc = ima_check_blacklist(iint, modsig, pcr); + rc = ima_check_blacklist(ns, iint, modsig, pcr); if (rc != -EPERM) { inode_lock(inode); rc = ima_appraise_measurement(func, iint, file, @@ -405,12 +407,13 @@ static int process_measurement(struct file *file, const struct cred *cred, */ int ima_file_mmap(struct file *file, unsigned long prot) { + struct ima_namespace *ns = &init_ima_ns; u32 secid; if (file && (prot & PROT_EXEC)) { security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, NULL, - 0, MAY_EXEC, MMAP_CHECK); + return process_measurement(ns, file, current_cred(), secid, + NULL, 0, MAY_EXEC, MMAP_CHECK); } return 0; @@ -430,6 +433,7 @@ int ima_file_mmap(struct file *file, unsigned long prot) */ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot) { + struct ima_namespace *ns = &init_ima_ns; struct ima_template_desc *template = NULL; struct file *file = vma->vm_file; char filename[NAME_MAX]; @@ -442,13 +446,13 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot) int pcr; /* Is mprotect making an mmap'ed file executable? */ - if (!(ima_policy_flag & IMA_APPRAISE) || !vma->vm_file || + if (!(ns->ima_policy_flag & IMA_APPRAISE) || !vma->vm_file || !(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC)) return 0; security_current_getsecid_subj(&secid); inode = file_inode(vma->vm_file); - action = ima_get_action(file_mnt_user_ns(vma->vm_file), inode, + action = ima_get_action(ns, file_mnt_user_ns(vma->vm_file), inode, current_cred(), secid, MAY_EXEC, MMAP_CHECK, &pcr, &template, NULL, NULL); @@ -484,17 +488,18 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot) */ int ima_bprm_check(struct linux_binprm *bprm) { + struct ima_namespace *ns = &init_ima_ns; int ret; u32 secid; security_current_getsecid_subj(&secid); - ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0, - MAY_EXEC, BPRM_CHECK); + ret = process_measurement(ns, bprm->file, current_cred(), secid, NULL, + 0, MAY_EXEC, BPRM_CHECK); if (ret) return ret; security_cred_getsecid(bprm->cred, &secid); - return process_measurement(bprm->file, bprm->cred, secid, NULL, 0, + return process_measurement(ns, bprm->file, bprm->cred, secid, NULL, 0, MAY_EXEC, CREDS_CHECK); } @@ -510,21 +515,23 @@ int ima_bprm_check(struct linux_binprm *bprm) */ int ima_file_check(struct file *file, int mask) { + struct ima_namespace *ns = &init_ima_ns; u32 secid; security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, NULL, 0, + return process_measurement(ns, file, current_cred(), secid, NULL, 0, mask & (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND), FILE_CHECK); } EXPORT_SYMBOL_GPL(ima_file_check); -static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) +static int __ima_inode_hash(struct ima_namespace *ns, + struct inode *inode, char *buf, size_t buf_size) { struct integrity_iint_cache *iint; int hash_algo; - if (!ima_policy_flag) + if (!ns->ima_policy_flag) return -EOPNOTSUPP; iint = integrity_iint_find(inode); @@ -574,10 +581,12 @@ static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) */ int ima_file_hash(struct file *file, char *buf, size_t buf_size) { + struct ima_namespace *ns = &init_ima_ns; + if (!file) return -EINVAL; - return __ima_inode_hash(file_inode(file), buf, buf_size); + return __ima_inode_hash(ns, file_inode(file), buf, buf_size); } EXPORT_SYMBOL_GPL(ima_file_hash); @@ -601,10 +610,12 @@ EXPORT_SYMBOL_GPL(ima_file_hash); */ int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) { + struct ima_namespace *ns = &init_ima_ns; + if (!inode) return -EINVAL; - return __ima_inode_hash(inode, buf, buf_size); + return __ima_inode_hash(ns, inode, buf, buf_size); } EXPORT_SYMBOL_GPL(ima_inode_hash); @@ -620,13 +631,14 @@ EXPORT_SYMBOL_GPL(ima_inode_hash); void ima_post_create_tmpfile(struct user_namespace *mnt_userns, struct inode *inode) { + struct ima_namespace *ns = &init_ima_ns; struct integrity_iint_cache *iint; int must_appraise; - if (!ima_policy_flag || !S_ISREG(inode->i_mode)) + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode)) return; - must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS, + must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS, FILE_CHECK); if (!must_appraise) return; @@ -652,14 +664,15 @@ void ima_post_create_tmpfile(struct user_namespace *mnt_userns, void ima_post_path_mknod(struct user_namespace *mnt_userns, struct dentry *dentry) { + struct ima_namespace *ns = &init_ima_ns; struct integrity_iint_cache *iint; struct inode *inode = dentry->d_inode; int must_appraise; - if (!ima_policy_flag || !S_ISREG(inode->i_mode)) + if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode)) return; - must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS, + must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS, FILE_CHECK); if (!must_appraise) return; @@ -688,6 +701,7 @@ void ima_post_path_mknod(struct user_namespace *mnt_userns, int ima_read_file(struct file *file, enum kernel_read_file_id read_id, bool contents) { + struct ima_namespace *ns = &init_ima_ns; enum ima_hooks func; u32 secid; @@ -710,7 +724,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id, /* Read entire file for all partial reads. */ func = read_idmap[read_id] ?: FILE_CHECK; security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, NULL, + return process_measurement(ns, file, current_cred(), secid, NULL, 0, MAY_READ, func); } @@ -738,6 +752,7 @@ const int read_idmap[READING_MAX_ID] = { int ima_post_read_file(struct file *file, void *buf, loff_t size, enum kernel_read_file_id read_id) { + struct ima_namespace *ns = &init_ima_ns; enum ima_hooks func; u32 secid; @@ -746,14 +761,15 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, return 0; if (!file || !buf || size == 0) { /* should never happen */ - if (ima_appraise & IMA_APPRAISE_ENFORCE) + if (ns == &init_ima_ns && + (ima_appraise & IMA_APPRAISE_ENFORCE)) return -EACCES; return 0; } func = read_idmap[read_id] ?: FILE_CHECK; security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, buf, size, + return process_measurement(ns, file, current_cred(), secid, buf, size, MAY_READ, func); } @@ -841,6 +857,7 @@ int ima_post_load_data(char *buf, loff_t size, /** * process_buffer_measurement - Measure the buffer or the buffer data hash + * @ns: IMA namespace that has the policy * @mnt_userns: user namespace of the mount the inode was found from * @inode: inode associated with the object being measured (NULL for KEY_CHECK) * @buf: pointer to the buffer that needs to be added to the log. @@ -859,7 +876,8 @@ int ima_post_load_data(char *buf, loff_t size, * has been written to the passed location but not added to a measurement entry, * a negative value otherwise. */ -int process_buffer_measurement(struct user_namespace *mnt_userns, +int process_buffer_measurement(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, const void *buf, int size, const char *eventname, enum ima_hooks func, int pcr, const char *func_data, @@ -887,7 +905,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns, if (digest && digest_len < digest_hash_len) return -EINVAL; - if (!ima_policy_flag && !digest) + if (!ns->ima_policy_flag && !digest) return -ENOENT; template = ima_template_desc_buf(); @@ -906,7 +924,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns, */ if (func) { security_current_getsecid_subj(&secid); - action = ima_get_action(mnt_userns, inode, current_cred(), + action = ima_get_action(ns, mnt_userns, inode, current_cred(), secid, 0, func, &pcr, &template, func_data, NULL); if (!(action & IMA_MEASURE) && !digest) @@ -943,7 +961,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns, if (digest) memcpy(digest, iint.ima_hash->digest, digest_hash_len); - if (!ima_policy_flag || (func && !(action & IMA_MEASURE))) + if (!ns->ima_policy_flag || (func && !(action & IMA_MEASURE))) return 1; ret = ima_alloc_init_template(&event_data, &entry, template); @@ -977,6 +995,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns, */ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) { + struct ima_namespace *ns = &init_ima_ns; struct fd f; if (!buf || !size) @@ -986,7 +1005,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) if (!f.file) return; - process_buffer_measurement(file_mnt_user_ns(f.file), file_inode(f.file), + process_buffer_measurement(ns, + file_mnt_user_ns(f.file), file_inode(f.file), buf, size, "kexec-cmdline", KEXEC_CMDLINE, 0, NULL, false, NULL, 0); fdput(f); @@ -1016,10 +1036,12 @@ int ima_measure_critical_data(const char *event_label, const void *buf, size_t buf_len, bool hash, u8 *digest, size_t digest_len) { + struct ima_namespace *ns = &init_ima_ns; + if (!event_name || !event_label || !buf || !buf_len) return -ENOPARAM; - return process_buffer_measurement(&init_user_ns, NULL, buf, buf_len, + return process_buffer_measurement(ns, &init_user_ns, NULL, buf, buf_len, event_name, CRITICAL_DATA, 0, event_label, hash, digest, digest_len); @@ -1028,6 +1050,7 @@ EXPORT_SYMBOL_GPL(ima_measure_critical_data); static int __init init_ima(void) { + struct ima_namespace *ns = &init_ima_ns; int error; ima_appraise_parse_cmdline(); @@ -1052,7 +1075,7 @@ static int __init init_ima(void) pr_warn("Couldn't register LSM notifier, error %d\n", error); if (!error) - ima_update_policy_flags(); + ima_update_policy_flags(ns); return error; } diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 2a1f6418b10a..b0e1c16b7f37 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -52,7 +52,6 @@ #define INVALID_PCR(a) (((a) < 0) || \ (a) >= (sizeof_field(struct integrity_iint_cache, measured_pcrs) * 8)) -int ima_policy_flag; static int temp_ima_appraise; static int build_ima_appraise __ro_after_init; @@ -233,11 +232,6 @@ static struct ima_rule_entry critical_data_rules[] __ro_after_init = { /* An array of architecture specific rules */ static struct ima_rule_entry *arch_policy_entry __ro_after_init; -static LIST_HEAD(ima_default_rules); -static LIST_HEAD(ima_policy_rules); -static LIST_HEAD(ima_temp_rules); -static struct list_head __rcu *ima_rules = (struct list_head __rcu *)(&ima_default_rules); - static int ima_policy __initdata; static int __init default_measure_policy_setup(char *str) @@ -454,12 +448,12 @@ static bool ima_rule_contains_lsm_cond(struct ima_rule_entry *entry) * to the old, stale LSM policy. Update the IMA LSM based rules to reflect * the reloaded LSM policy. */ -static void ima_lsm_update_rules(void) +static void ima_lsm_update_rules(struct ima_namespace *ns) { struct ima_rule_entry *entry, *e; int result; - list_for_each_entry_safe(entry, e, &ima_policy_rules, list) { + list_for_each_entry_safe(entry, e, &ns->ima_policy_rules, list) { if (!ima_rule_contains_lsm_cond(entry)) continue; @@ -474,10 +468,12 @@ static void ima_lsm_update_rules(void) int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event, void *lsm_data) { + struct ima_namespace *ns = &init_ima_ns; + if (event != LSM_POLICY_CHANGE) return NOTIFY_DONE; - ima_lsm_update_rules(); + ima_lsm_update_rules(ns); return NOTIFY_OK; } @@ -669,6 +665,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func) /** * ima_match_policy - decision based on LSM and other conditions + * @ns: IMA namespace that has the policy * @mnt_userns: user namespace of the mount the inode was found from * @inode: pointer to an inode for which the policy decision is being made * @cred: pointer to a credentials structure for which the policy decision is @@ -688,7 +685,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func) * list when walking it. Reads are many orders of magnitude more numerous * than writes so ima_match_policy() is classical RCU candidate. */ -int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, +int ima_match_policy(struct ima_namespace *ns, + struct user_namespace *mnt_userns, struct inode *inode, const struct cred *cred, u32 secid, enum ima_hooks func, int mask, int flags, int *pcr, struct ima_template_desc **template_desc, @@ -702,7 +700,7 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, *template_desc = ima_template_desc_current(); rcu_read_lock(); - ima_rules_tmp = rcu_dereference(ima_rules); + ima_rules_tmp = rcu_dereference(ns->ima_rules); list_for_each_entry_rcu(entry, ima_rules_tmp, list) { if (!(entry->action & actmask)) @@ -746,8 +744,8 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, } /** - * ima_update_policy_flags() - Update global IMA variables - * + * ima_update_policy_flags() - Update namespaced IMA variables + * @ns: IMA namespace that has the policy * Update ima_policy_flag and ima_setxattr_allowed_hash_algorithms * based on the currently loaded policy. * @@ -760,14 +758,14 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, * * Context: called after a policy update and at system initialization. */ -void ima_update_policy_flags(void) +void ima_update_policy_flags(struct ima_namespace *ns) { struct ima_rule_entry *entry; int new_policy_flag = 0; struct list_head *ima_rules_tmp; rcu_read_lock(); - ima_rules_tmp = rcu_dereference(ima_rules); + ima_rules_tmp = rcu_dereference(ns->ima_rules); list_for_each_entry_rcu(entry, ima_rules_tmp, list) { /* * SETXATTR_CHECK rules do not implement a full policy check @@ -797,7 +795,7 @@ void ima_update_policy_flags(void) if (!ima_appraise) new_policy_flag &= ~IMA_APPRAISE; - ima_policy_flag = new_policy_flag; + ns->ima_policy_flag = new_policy_flag; } static int ima_appraise_flag(enum ima_hooks func) @@ -813,7 +811,8 @@ static int ima_appraise_flag(enum ima_hooks func) return 0; } -static void add_rules(struct ima_rule_entry *entries, int count, +static void add_rules(struct ima_namespace *ns, + struct ima_rule_entry *entries, int count, enum policy_rule_list policy_rule) { int i = 0; @@ -822,7 +821,7 @@ static void add_rules(struct ima_rule_entry *entries, int count, struct ima_rule_entry *entry; if (policy_rule & IMA_DEFAULT_POLICY) - list_add_tail(&entries[i].list, &ima_default_rules); + list_add_tail(&entries[i].list, &ns->ima_default_rules); if (policy_rule & IMA_CUSTOM_POLICY) { entry = kmemdup(&entries[i], sizeof(*entry), @@ -830,7 +829,7 @@ static void add_rules(struct ima_rule_entry *entries, int count, if (!entry) continue; - list_add_tail(&entry->list, &ima_policy_rules); + list_add_tail(&entry->list, &ns->ima_policy_rules); } if (entries[i].action == APPRAISE) { if (entries != build_appraise_rules) @@ -843,9 +842,10 @@ static void add_rules(struct ima_rule_entry *entries, int count, } } -static int ima_parse_rule(char *rule, struct ima_rule_entry *entry); +static int ima_parse_rule(struct ima_namespace *ns, + char *rule, struct ima_rule_entry *entry); -static int __init ima_init_arch_policy(void) +static int __init ima_init_arch_policy(struct ima_namespace *ns) { const char * const *arch_rules; const char * const *rules; @@ -873,7 +873,7 @@ static int __init ima_init_arch_policy(void) result = strscpy(rule, *rules, sizeof(rule)); INIT_LIST_HEAD(&arch_policy_entry[i].list); - result = ima_parse_rule(rule, &arch_policy_entry[i]); + result = ima_parse_rule(ns, rule, &arch_policy_entry[i]); if (result) { pr_warn("Skipping unknown architecture policy rule: %s\n", rule); @@ -888,26 +888,27 @@ static int __init ima_init_arch_policy(void) /** * ima_init_policy - initialize the default measure rules. - * + * @ns: IMA namespace to which the policy belongs to * ima_rules points to either the ima_default_rules or the new ima_policy_rules. */ -void __init ima_init_policy(void) +void __init ima_init_policy(struct ima_namespace *ns) { int build_appraise_entries, arch_entries; /* if !ima_policy, we load NO default rules */ if (ima_policy) - add_rules(dont_measure_rules, ARRAY_SIZE(dont_measure_rules), + add_rules(ns, dont_measure_rules, + ARRAY_SIZE(dont_measure_rules), IMA_DEFAULT_POLICY); switch (ima_policy) { case ORIGINAL_TCB: - add_rules(original_measurement_rules, + add_rules(ns, original_measurement_rules, ARRAY_SIZE(original_measurement_rules), IMA_DEFAULT_POLICY); break; case DEFAULT_TCB: - add_rules(default_measurement_rules, + add_rules(ns, default_measurement_rules, ARRAY_SIZE(default_measurement_rules), IMA_DEFAULT_POLICY); break; @@ -921,11 +922,11 @@ void __init ima_init_policy(void) * and custom policies, prior to other appraise rules. * (Highest priority) */ - arch_entries = ima_init_arch_policy(); + arch_entries = ima_init_arch_policy(ns); if (!arch_entries) pr_info("No architecture policies found\n"); else - add_rules(arch_policy_entry, arch_entries, + add_rules(ns, arch_policy_entry, arch_entries, IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY); /* @@ -933,7 +934,7 @@ void __init ima_init_policy(void) * signatures, prior to other appraise rules. */ if (ima_use_secure_boot) - add_rules(secure_boot_rules, ARRAY_SIZE(secure_boot_rules), + add_rules(ns, secure_boot_rules, ARRAY_SIZE(secure_boot_rules), IMA_DEFAULT_POLICY); /* @@ -945,39 +946,41 @@ void __init ima_init_policy(void) build_appraise_entries = ARRAY_SIZE(build_appraise_rules); if (build_appraise_entries) { if (ima_use_secure_boot) - add_rules(build_appraise_rules, build_appraise_entries, + add_rules(ns, build_appraise_rules, + build_appraise_entries, IMA_CUSTOM_POLICY); else - add_rules(build_appraise_rules, build_appraise_entries, + add_rules(ns, build_appraise_rules, + build_appraise_entries, IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY); } if (ima_use_appraise_tcb) - add_rules(default_appraise_rules, + add_rules(ns, default_appraise_rules, ARRAY_SIZE(default_appraise_rules), IMA_DEFAULT_POLICY); if (ima_use_critical_data) - add_rules(critical_data_rules, + add_rules(ns, critical_data_rules, ARRAY_SIZE(critical_data_rules), IMA_DEFAULT_POLICY); atomic_set(&ima_setxattr_allowed_hash_algorithms, 0); - ima_update_policy_flags(); + ima_update_policy_flags(ns); } /* Make sure we have a valid policy, at least containing some rules. */ -int ima_check_policy(void) +int ima_check_policy(struct ima_namespace *ns) { - if (list_empty(&ima_temp_rules)) + if (list_empty(&ns->ima_temp_rules)) return -EINVAL; return 0; } /** * ima_update_policy - update default_rules with new measure rules - * + * @ns: IMA namespace that has the policy * Called on file .release to update the default rules with a complete new * policy. What we do here is to splice ima_policy_rules and ima_temp_rules so * they make a queue. The policy may be updated multiple times and this is the @@ -986,16 +989,17 @@ int ima_check_policy(void) * Policy rules are never deleted so ima_policy_flag gets zeroed only once when * we switch from the default policy to user defined. */ -void ima_update_policy(void) +void ima_update_policy(struct ima_namespace *ns) { - struct list_head *policy = &ima_policy_rules; + struct list_head *policy = &ns->ima_policy_rules; - list_splice_tail_init_rcu(&ima_temp_rules, policy, synchronize_rcu); + list_splice_tail_init_rcu(&ns->ima_temp_rules, policy, + synchronize_rcu); - if (ima_rules != (struct list_head __rcu *)policy) { - ima_policy_flag = 0; + if (ns->ima_rules != (struct list_head __rcu *)policy) { + ns->ima_policy_flag = 0; - rcu_assign_pointer(ima_rules, policy); + rcu_assign_pointer(ns->ima_rules, policy); /* * IMA architecture specific policy rules are specified * as strings and converted to an array of ima_entry_rules @@ -1004,10 +1008,10 @@ void ima_update_policy(void) */ kfree(arch_policy_entry); } - ima_update_policy_flags(); + ima_update_policy_flags(ns); /* Custom IMA policy has been loaded */ - ima_process_queued_keys(); + ima_process_queued_keys(ns); } /* Keep the enumeration in sync with the policy_tokens! */ @@ -1077,7 +1081,8 @@ static const match_table_t policy_tokens = { {Opt_err, NULL} }; -static int ima_lsm_rule_init(struct ima_rule_entry *entry, +static int ima_lsm_rule_init(struct ima_namespace *ns, + struct ima_rule_entry *entry, substring_t *args, int lsm_rule, int audit_type) { int result; @@ -1097,7 +1102,8 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, pr_warn("rule for LSM \'%s\' is undefined\n", entry->lsm[lsm_rule].args_p); - if (ima_rules == (struct list_head __rcu *)(&ima_default_rules)) { + if (ns->ima_rules == + (struct list_head __rcu *)&ns->ima_default_rules) { kfree(entry->lsm[lsm_rule].args_p); entry->lsm[lsm_rule].args_p = NULL; result = -EINVAL; @@ -1324,7 +1330,8 @@ static unsigned int ima_parse_appraise_algos(char *arg) return res; } -static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) +static int ima_parse_rule(struct ima_namespace *ns, + char *rule, struct ima_rule_entry *entry) { struct audit_buffer *ab; char *from; @@ -1674,37 +1681,37 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) break; case Opt_obj_user: ima_log_string(ab, "obj_user", args[0].from); - result = ima_lsm_rule_init(entry, args, + result = ima_lsm_rule_init(ns, entry, args, LSM_OBJ_USER, AUDIT_OBJ_USER); break; case Opt_obj_role: ima_log_string(ab, "obj_role", args[0].from); - result = ima_lsm_rule_init(entry, args, + result = ima_lsm_rule_init(ns, entry, args, LSM_OBJ_ROLE, AUDIT_OBJ_ROLE); break; case Opt_obj_type: ima_log_string(ab, "obj_type", args[0].from); - result = ima_lsm_rule_init(entry, args, + result = ima_lsm_rule_init(ns, entry, args, LSM_OBJ_TYPE, AUDIT_OBJ_TYPE); break; case Opt_subj_user: ima_log_string(ab, "subj_user", args[0].from); - result = ima_lsm_rule_init(entry, args, + result = ima_lsm_rule_init(ns, entry, args, LSM_SUBJ_USER, AUDIT_SUBJ_USER); break; case Opt_subj_role: ima_log_string(ab, "subj_role", args[0].from); - result = ima_lsm_rule_init(entry, args, + result = ima_lsm_rule_init(ns, entry, args, LSM_SUBJ_ROLE, AUDIT_SUBJ_ROLE); break; case Opt_subj_type: ima_log_string(ab, "subj_type", args[0].from); - result = ima_lsm_rule_init(entry, args, + result = ima_lsm_rule_init(ns, entry, args, LSM_SUBJ_TYPE, AUDIT_SUBJ_TYPE); break; @@ -1805,12 +1812,13 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) /** * ima_parse_add_rule - add a rule to ima_policy_rules + * @ns: IMA namespace that has the policy * @rule - ima measurement policy rule * * Avoid locking by allowing just one writer at a time in ima_write_policy() * Returns the length of the rule parsed, an error code on failure */ -ssize_t ima_parse_add_rule(char *rule) +ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule) { static const char op[] = "update_policy"; char *p; @@ -1834,7 +1842,7 @@ ssize_t ima_parse_add_rule(char *rule) INIT_LIST_HEAD(&entry->list); - result = ima_parse_rule(p, entry); + result = ima_parse_rule(ns, p, entry); if (result) { ima_free_rule(entry); integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, @@ -1843,23 +1851,24 @@ ssize_t ima_parse_add_rule(char *rule) return result; } - list_add_tail(&entry->list, &ima_temp_rules); + list_add_tail(&entry->list, &ns->ima_temp_rules); return len; } /** - * ima_delete_rules() called to cleanup invalid in-flight policy. + * ima_delete_rules - called to cleanup invalid in-flight policy. + * @ns: IMA namespace that has the policy * We don't need locking as we operate on the temp list, which is * different from the active one. There is also only one user of * ima_delete_rules() at a time. */ -void ima_delete_rules(void) +void ima_delete_rules(struct ima_namespace *ns) { struct ima_rule_entry *entry, *tmp; temp_ima_appraise = 0; - list_for_each_entry_safe(entry, tmp, &ima_temp_rules, list) { + list_for_each_entry_safe(entry, tmp, &ns->ima_temp_rules, list) { list_del(&entry->list); ima_free_rule(entry); } @@ -1885,12 +1894,13 @@ static const char *const mask_tokens[] = { void *ima_policy_start(struct seq_file *m, loff_t *pos) { + struct ima_namespace *ns = &init_ima_ns; loff_t l = *pos; struct ima_rule_entry *entry; struct list_head *ima_rules_tmp; rcu_read_lock(); - ima_rules_tmp = rcu_dereference(ima_rules); + ima_rules_tmp = rcu_dereference(ns->ima_rules); list_for_each_entry_rcu(entry, ima_rules_tmp, list) { if (!l--) { rcu_read_unlock(); @@ -1903,6 +1913,7 @@ void *ima_policy_start(struct seq_file *m, loff_t *pos) void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos) { + struct ima_namespace *ns = &init_ima_ns; struct ima_rule_entry *entry = v; rcu_read_lock(); @@ -1910,8 +1921,8 @@ void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos) rcu_read_unlock(); (*pos)++; - return (&entry->list == &ima_default_rules || - &entry->list == &ima_policy_rules) ? NULL : entry; + return (&entry->list == &ns->ima_default_rules || + &entry->list == &ns->ima_policy_rules) ? NULL : entry; } void ima_policy_stop(struct seq_file *m, void *v) @@ -2174,6 +2185,7 @@ int ima_policy_show(struct seq_file *m, void *v) */ bool ima_appraise_signature(enum kernel_read_file_id id) { + struct ima_namespace *ns = &init_ima_ns; struct ima_rule_entry *entry; bool found = false; enum ima_hooks func; @@ -2185,7 +2197,7 @@ bool ima_appraise_signature(enum kernel_read_file_id id) func = read_idmap[id] ?: FILE_CHECK; rcu_read_lock(); - ima_rules_tmp = rcu_dereference(ima_rules); + ima_rules_tmp = rcu_dereference(ns->ima_rules); list_for_each_entry_rcu(entry, ima_rules_tmp, list) { if (entry->action != APPRAISE) continue; diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c index 93056c03bf5a..e366a21dd8be 100644 --- a/security/integrity/ima/ima_queue_keys.c +++ b/security/integrity/ima/ima_queue_keys.c @@ -10,6 +10,7 @@ #include #include +#include #include #include "ima.h" @@ -42,7 +43,7 @@ static bool timer_expired; static void ima_keys_handler(struct work_struct *work) { timer_expired = true; - ima_process_queued_keys(); + ima_process_queued_keys(&init_ima_ns); } /* @@ -130,11 +131,15 @@ bool ima_queue_key(struct key *keyring, const void *payload, * This function sets ima_process_keys to true and processes queued keys. * From here on keys will be processed right away (not queued). */ -void ima_process_queued_keys(void) +void ima_process_queued_keys(struct ima_namespace *ns) { struct ima_key_entry *entry, *tmp; bool process = false; + /* only applies to init_ima_ns */ + if (ns != &init_ima_ns) + return; + if (ima_process_keys) return; @@ -159,7 +164,7 @@ void ima_process_queued_keys(void) list_for_each_entry_safe(entry, tmp, &ima_keys, list) { if (!timer_expired) - process_buffer_measurement(&init_user_ns, NULL, + process_buffer_measurement(ns, &init_user_ns, NULL, entry->payload, entry->payload_len, entry->keyring_name, From patchwork Wed Mar 2 13:46:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766055 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD53BC43217 for ; Wed, 2 Mar 2022 13:51:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242484AbiCBNvo (ORCPT ); Wed, 2 Mar 2022 08:51:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242437AbiCBNv2 (ORCPT ); Wed, 2 Mar 2022 08:51:28 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E54E1C5D89; Wed, 2 Mar 2022 05:50:29 -0800 (PST) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222DJ7g6003535; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=4UXUDAETnUah9fRVnj8wSJGeIBkvnEwOPlI6Ze7yjPg=; b=Q6T+hX9HFpi6G2oXTrZDw+DGoKVJQysEILLHJ4AlCyZbcEQD2lg1/c57LQAYVdXwjCKz Qsr/vmQE42mgX+ihKXT38BtssYL+sQgybzNFAvadF+6VegotbVswiwq6u6U151sbRVWx jHxlbnGGw1jpM/+VqxTIpLm25h5zbeSdc+IGZe1/MfK7rNO3ikyRzUm9eqWVhfkORxZt 03V/197J/oNPyBdaDHR/DBNQqNmxTxvCkHCheaLChoxY55FWKru089kIIuKwC7Kd7EZe XDpIKtrBihGs/MPrU3OcCGWyIWlBEKdVtBoioSf51rr1IQbXunRBKbncZ6oUHCHlPxZz Cg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej9bsgjr8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:01 +0000 Received: from m0098394.ppops.net (m0098394.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DKHkP005283; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej9bsgjqr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222Dm7si019606; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma04dal.us.ibm.com with ESMTP id 3efbua5y46-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnvN534210074 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:57 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A618811206B; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8804311206F; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger , Christian Brauner Subject: [PATCH v11 05/27] ima: Move arch_policy_entry into ima_namespace Date: Wed, 2 Mar 2022 08:46:40 -0500 Message-Id: <20220302134703.1273041-6-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 1_cZ8RAnd0Rmgu-nptZ1YLOpBtp8izE3 X-Proofpoint-GUID: ZSS7fOxGNW6U2lGOuatPw78dfmnck80p X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=999 spamscore=0 clxscore=1015 phishscore=0 priorityscore=1501 adultscore=0 malwarescore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: The architecture-specific policy rules, currently defined for EFI and powerpc, require the kexec kernel image and kernel modules to be validly signed and measured, based on the system's secure boot and/or trusted boot mode and the IMA_ARCH_POLICY Kconfig option being enabled. To avoid special-casing init_ima_ns as much as possible, move the arch_policy_entry into the ima_namespace. When freeing the arch_policy_entry set the pointer to NULL. Signed-off-by: Stefan Berger Acked-by: Christian Brauner Reviewed-by: Mimi Zohar --- security/integrity/ima/ima.h | 3 +++ security/integrity/ima/ima_init_ima_ns.c | 1 + security/integrity/ima/ima_policy.c | 23 +++++++++++------------ 3 files changed, 15 insertions(+), 12 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 9bcde1a24e74..2305bf223a98 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -125,6 +125,9 @@ struct ima_namespace { struct list_head __rcu *ima_rules; /* Pointer to the current policy */ int ima_policy_flag; + + /* An array of architecture specific rules */ + struct ima_rule_entry *arch_policy_entry; } __randomize_layout; extern struct ima_namespace init_ima_ns; diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c index c919a456b525..ae33621c3955 100644 --- a/security/integrity/ima/ima_init_ima_ns.c +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -15,6 +15,7 @@ static int ima_init_namespace(struct ima_namespace *ns) INIT_LIST_HEAD(&ns->ima_temp_rules); ns->ima_rules = (struct list_head __rcu *)(&ns->ima_default_rules); ns->ima_policy_flag = 0; + ns->arch_policy_entry = NULL; return 0; } diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index b0e1c16b7f37..05b2bc06ab0c 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -229,9 +229,6 @@ static struct ima_rule_entry critical_data_rules[] __ro_after_init = { {.action = MEASURE, .func = CRITICAL_DATA, .flags = IMA_FUNC}, }; -/* An array of architecture specific rules */ -static struct ima_rule_entry *arch_policy_entry __ro_after_init; - static int ima_policy __initdata; static int __init default_measure_policy_setup(char *str) @@ -860,9 +857,10 @@ static int __init ima_init_arch_policy(struct ima_namespace *ns) for (rules = arch_rules; *rules != NULL; rules++) arch_entries++; - arch_policy_entry = kcalloc(arch_entries + 1, - sizeof(*arch_policy_entry), GFP_KERNEL); - if (!arch_policy_entry) + ns->arch_policy_entry = kcalloc(arch_entries + 1, + sizeof(*ns->arch_policy_entry), + GFP_KERNEL); + if (!ns->arch_policy_entry) return 0; /* Convert each policy string rules to struct ima_rule_entry format */ @@ -872,13 +870,13 @@ static int __init ima_init_arch_policy(struct ima_namespace *ns) result = strscpy(rule, *rules, sizeof(rule)); - INIT_LIST_HEAD(&arch_policy_entry[i].list); - result = ima_parse_rule(ns, rule, &arch_policy_entry[i]); + INIT_LIST_HEAD(&ns->arch_policy_entry[i].list); + result = ima_parse_rule(ns, rule, &ns->arch_policy_entry[i]); if (result) { pr_warn("Skipping unknown architecture policy rule: %s\n", rule); - memset(&arch_policy_entry[i], 0, - sizeof(*arch_policy_entry)); + memset(&ns->arch_policy_entry[i], 0, + sizeof(ns->arch_policy_entry[i])); continue; } i++; @@ -926,7 +924,7 @@ void __init ima_init_policy(struct ima_namespace *ns) if (!arch_entries) pr_info("No architecture policies found\n"); else - add_rules(ns, arch_policy_entry, arch_entries, + add_rules(ns, ns->arch_policy_entry, arch_entries, IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY); /* @@ -1006,7 +1004,8 @@ void ima_update_policy(struct ima_namespace *ns) * on boot. After loading a custom policy, free the * architecture specific rules stored as an array. */ - kfree(arch_policy_entry); + kfree(ns->arch_policy_entry); + ns->arch_policy_entry = NULL; } ima_update_policy_flags(ns); From patchwork Wed Mar 2 13:46:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766054 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2159AC433EF for ; Wed, 2 Mar 2022 13:51:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242494AbiCBNvl (ORCPT ); Wed, 2 Mar 2022 08:51:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242438AbiCBNv2 (ORCPT ); Wed, 2 Mar 2022 08:51:28 -0500 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B9DFC5D86; Wed, 2 Mar 2022 05:50:28 -0800 (PST) Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222CRUrB032008; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=3XeW/tnbBJp3eT49UWJECmSneJnuuG6joTjd4yNX9EY=; b=A35tZfBqEtajt19LKYA1e533Rzc/27K04vmLtY/peBW7sZguIlComEvGkPyJcMVKf/w1 n+xLfX5j6AjhtP1N88Efyf9oSkSve+LLGbN8RLH/E2mL8dZABGuFJPxUX6lwVTwpLa0e ul/n8fkLoneoROj5BAxB00gNcE7EnfQUSDFsdEVJJX54pSpr5IWW2DqLcdbnunL4ciHU AzbTSPrq1BntSF62IjeMy085ylNwnKSEDdhsUUCCey9502L3MFB4xXrsET9EVML795DX JHWvwJXwA6xYqqnVqhXOO4o1RLQKgaZYs3GOYMfT+rxTyYdLKB95ZeozsEgnvE9vQiMQ vw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej4h3r921-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from m0098421.ppops.net (m0098421.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DkPMp026042; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma03wdc.us.ibm.com (ba.79.3fa9.ip4.static.sl-reverse.com [169.63.121.186]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej4h3r91q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from pps.filterd (ppma03wdc.us.ibm.com [127.0.0.1]) by ppma03wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222Dn8l1031300; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma03wdc.us.ibm.com with ESMTP id 3efbua4v0b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnvFf29950276 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:58 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D67EF11206B; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AC2CE112070; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger , Christian Brauner Subject: [PATCH v11 06/27] ima: Move ima_htable into ima_namespace Date: Wed, 2 Mar 2022 08:46:41 -0500 Message-Id: <20220302134703.1273041-7-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: uy6AAOvNXYsT4W1AwlLqtbphD525GvPy X-Proofpoint-GUID: fPBf3SypnuCl5cug0y8pyke1ES6WYlQ9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 spamscore=0 adultscore=0 suspectscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Move ima_htable into ima_namespace. This way a front-end like securityfs can show the number of measurement records and number of violations of an IMA namespace. Signed-off-by: Stefan Berger Acked-by: Christian Brauner Reviewed-by: Mimi Zohar --- security/integrity/ima/ima.h | 33 +++++++++++++--------- security/integrity/ima/ima_api.c | 18 +++++++----- security/integrity/ima/ima_fs.c | 8 ++++-- security/integrity/ima/ima_init.c | 7 +++-- security/integrity/ima/ima_init_ima_ns.c | 4 +++ security/integrity/ima/ima_kexec.c | 3 +- security/integrity/ima/ima_main.c | 14 +++++---- security/integrity/ima/ima_queue.c | 36 ++++++++++++------------ security/integrity/ima/ima_template.c | 5 ++-- 9 files changed, 76 insertions(+), 52 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 2305bf223a98..78798cfcf46c 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -117,6 +117,12 @@ struct ima_kexec_hdr { u64 count; }; +struct ima_h_table { + atomic_long_t len; /* number of stored measurements in the list */ + atomic_long_t violations; + struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; +}; + struct ima_namespace { /* policy rules */ struct list_head ima_default_rules; /* Kconfig, builtin & arch rules */ @@ -128,6 +134,8 @@ struct ima_namespace { /* An array of architecture specific rules */ struct ima_rule_entry *arch_policy_entry; + + struct ima_h_table ima_htable; } __randomize_layout; extern struct ima_namespace init_ima_ns; @@ -149,7 +157,8 @@ extern bool ima_canonical_fmt; int ima_init(void); int ima_fs_init(void); int ima_ns_init(void); -int ima_add_template_entry(struct ima_template_entry *entry, int violation, +int ima_add_template_entry(struct ima_namespace *ns, + struct ima_template_entry *entry, int violation, const char *op, struct inode *inode, const unsigned char *filename); int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); @@ -158,7 +167,8 @@ int ima_calc_buffer_hash(const void *buf, loff_t len, int ima_calc_field_array_hash(struct ima_field_data *field_data, struct ima_template_entry *entry); int ima_calc_boot_aggregate(struct ima_digest_data *hash); -void ima_add_violation(struct file *file, const unsigned char *filename, +void ima_add_violation(struct ima_namespace *ns, + struct file *file, const unsigned char *filename, struct integrity_iint_cache *iint, const char *op, const char *cause); int ima_init_crypto(void); @@ -171,8 +181,10 @@ struct ima_template_desc *ima_template_desc_current(void); struct ima_template_desc *ima_template_desc_buf(void); struct ima_template_desc *lookup_template_desc(const char *name); bool ima_template_has_modsig(const struct ima_template_desc *ima_template); -int ima_restore_measurement_entry(struct ima_template_entry *entry); -int ima_restore_measurement_list(loff_t bufsize, void *buf); +int ima_restore_measurement_entry(struct ima_namespace *ns, + struct ima_template_entry *entry); +int ima_restore_measurement_list(struct ima_namespace *ns, + loff_t bufsize, void *buf); int ima_measurements_show(struct seq_file *m, void *v); unsigned long ima_get_binary_runtime_size(void); int ima_init_template(void); @@ -186,13 +198,6 @@ int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event, */ extern spinlock_t ima_queue_lock; -struct ima_h_table { - atomic_long_t len; /* number of stored measurements in the list */ - atomic_long_t violations; - struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; -}; -extern struct ima_h_table ima_htable; - static inline unsigned int ima_hash_key(u8 *digest) { /* there is no point in taking a hash of part of a digest */ @@ -277,7 +282,8 @@ int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func); int ima_collect_measurement(struct integrity_iint_cache *iint, struct file *file, void *buf, loff_t size, enum hash_algo algo, struct modsig *modsig); -void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, +void ima_store_measurement(struct ima_namespace *ns, + struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, int pcr, @@ -293,7 +299,8 @@ void ima_audit_measurement(struct integrity_iint_cache *iint, int ima_alloc_init_template(struct ima_event_data *event_data, struct ima_template_entry **entry, struct ima_template_desc *template_desc); -int ima_store_template(struct ima_template_entry *entry, int violation, +int ima_store_template(struct ima_namespace *ns, + struct ima_template_entry *entry, int violation, struct inode *inode, const unsigned char *filename, int pcr); void ima_free_template_entry(struct ima_template_entry *entry); diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index 2df0d8549c13..bee35ebb3a38 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -99,7 +99,8 @@ int ima_alloc_init_template(struct ima_event_data *event_data, * * Returns 0 on success, error code otherwise */ -int ima_store_template(struct ima_template_entry *entry, +int ima_store_template(struct ima_namespace *ns, + struct ima_template_entry *entry, int violation, struct inode *inode, const unsigned char *filename, int pcr) { @@ -119,7 +120,8 @@ int ima_store_template(struct ima_template_entry *entry, } } entry->pcr = pcr; - result = ima_add_template_entry(entry, violation, op, inode, filename); + result = ima_add_template_entry(ns, entry, violation, op, inode, + filename); return result; } @@ -130,7 +132,8 @@ int ima_store_template(struct ima_template_entry *entry, * By extending the PCR with 0xFF's instead of with zeroes, the PCR * value is invalidated. */ -void ima_add_violation(struct file *file, const unsigned char *filename, +void ima_add_violation(struct ima_namespace *ns, + struct file *file, const unsigned char *filename, struct integrity_iint_cache *iint, const char *op, const char *cause) { @@ -144,14 +147,14 @@ void ima_add_violation(struct file *file, const unsigned char *filename, int result; /* can overflow, only indicator */ - atomic_long_inc(&ima_htable.violations); + atomic_long_inc(&ns->ima_htable.violations); result = ima_alloc_init_template(&event_data, &entry, NULL); if (result < 0) { result = -ENOMEM; goto err_out; } - result = ima_store_template(entry, violation, inode, + result = ima_store_template(ns, entry, violation, inode, filename, CONFIG_IMA_MEASURE_PCR_IDX); if (result < 0) ima_free_template_entry(entry); @@ -299,7 +302,8 @@ int ima_collect_measurement(struct integrity_iint_cache *iint, * * Must be called with iint->mutex held. */ -void ima_store_measurement(struct integrity_iint_cache *iint, +void ima_store_measurement(struct ima_namespace *ns, + struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, int pcr, @@ -334,7 +338,7 @@ void ima_store_measurement(struct integrity_iint_cache *iint, return; } - result = ima_store_template(entry, violation, inode, filename, pcr); + result = ima_store_template(ns, entry, violation, inode, filename, pcr); if ((!result || result == -EEXIST) && !(file->f_flags & O_DIRECT)) { iint->flags |= IMA_MEASURED; iint->measured_pcrs |= (0x1 << pcr); diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index f7ad93a56982..dca7fe32d65e 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -52,7 +52,10 @@ static ssize_t ima_show_htable_violations(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { - return ima_show_htable_value(buf, count, ppos, &ima_htable.violations); + struct ima_namespace *ns = &init_ima_ns; + + return ima_show_htable_value(buf, count, ppos, + &ns->ima_htable.violations); } static const struct file_operations ima_htable_violations_ops = { @@ -64,8 +67,9 @@ static ssize_t ima_show_measurements_count(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { - return ima_show_htable_value(buf, count, ppos, &ima_htable.len); + struct ima_namespace *ns = &init_ima_ns; + return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.len); } static const struct file_operations ima_measurements_count_ops = { diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index d6b829c360d7..22ca5d872be0 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -39,7 +39,7 @@ struct tpm_chip *ima_tpm_chip; * a different value.) Violations add a zero entry to the measurement * list and extend the aggregate PCR value with ff...ff's. */ -static int __init ima_add_boot_aggregate(void) +static int __init ima_add_boot_aggregate(struct ima_namespace *ns) { static const char op[] = "add_boot_aggregate"; const char *audit_cause = "ENOMEM"; @@ -86,7 +86,7 @@ static int __init ima_add_boot_aggregate(void) goto err_out; } - result = ima_store_template(entry, violation, NULL, + result = ima_store_template(ns, entry, violation, NULL, boot_aggregate_name, CONFIG_IMA_MEASURE_PCR_IDX); if (result < 0) { @@ -145,7 +145,8 @@ int __init ima_init(void) rc = ima_init_digests(); if (rc != 0) return rc; - rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */ + /* boot aggregate must be first entry */ + rc = ima_add_boot_aggregate(&init_ima_ns); if (rc != 0) return rc; diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c index ae33621c3955..1945fa8cfc4d 100644 --- a/security/integrity/ima/ima_init_ima_ns.c +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -17,6 +17,10 @@ static int ima_init_namespace(struct ima_namespace *ns) ns->ima_policy_flag = 0; ns->arch_policy_entry = NULL; + atomic_long_set(&ns->ima_htable.len, 0); + atomic_long_set(&ns->ima_htable.violations, 0); + memset(&ns->ima_htable.queue, 0, sizeof(ns->ima_htable.queue)); + return 0; } diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 13753136f03f..d7cc5cca6f84 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -146,7 +146,8 @@ void ima_load_kexec_buffer(void) rc = ima_get_kexec_buffer(&kexec_buffer, &kexec_buffer_size); switch (rc) { case 0: - rc = ima_restore_measurement_list(kexec_buffer_size, + rc = ima_restore_measurement_list(&init_ima_ns, + kexec_buffer_size, kexec_buffer); if (rc != 0) pr_err("Failed to restore the measurement list: %d\n", diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 9dc48ea216a5..c654c28fda14 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -112,7 +112,8 @@ static int mmap_violation_check(enum ima_hooks func, struct file *file, * could result in a file measurement error. * */ -static void ima_rdwr_violation_check(struct file *file, +static void ima_rdwr_violation_check(struct ima_namespace *ns, + struct file *file, struct integrity_iint_cache *iint, int must_measure, char **pathbuf, @@ -145,10 +146,10 @@ static void ima_rdwr_violation_check(struct file *file, *pathname = ima_d_path(&file->f_path, pathbuf, filename); if (send_tomtou) - ima_add_violation(file, *pathname, iint, + ima_add_violation(ns, file, *pathname, iint, "invalid_pcr", "ToMToU"); if (send_writers) - ima_add_violation(file, *pathname, iint, + ima_add_violation(ns, file, *pathname, iint, "invalid_pcr", "open_writers"); } @@ -249,7 +250,7 @@ static int process_measurement(struct ima_namespace *ns, } if (!rc && violation_check) - ima_rdwr_violation_check(file, iint, action & IMA_MEASURE, + ima_rdwr_violation_check(ns, file, iint, action & IMA_MEASURE, &pathbuf, &pathname, filename); inode_unlock(inode); @@ -344,7 +345,7 @@ static int process_measurement(struct ima_namespace *ns, pathname = ima_d_path(&file->f_path, &pathbuf, filename); if (action & IMA_MEASURE) - ima_store_measurement(iint, file, pathname, + ima_store_measurement(ns, iint, file, pathname, xattr_value, xattr_len, modsig, pcr, template_desc); if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) { @@ -970,7 +971,8 @@ int process_buffer_measurement(struct ima_namespace *ns, goto out; } - ret = ima_store_template(entry, violation, NULL, event_data.buf, pcr); + ret = ima_store_template(ns, entry, violation, NULL, event_data.buf, + pcr); if (ret < 0) { audit_cause = "store_entry"; ima_free_template_entry(entry); diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index 532da87ce519..43961d5cd2ef 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -31,13 +31,6 @@ static unsigned long binary_runtime_size; static unsigned long binary_runtime_size = ULONG_MAX; #endif -/* key: inode (before secure-hashing a file) */ -struct ima_h_table ima_htable = { - .len = ATOMIC_LONG_INIT(0), - .violations = ATOMIC_LONG_INIT(0), - .queue[0 ... IMA_MEASURE_HTABLE_SIZE - 1] = HLIST_HEAD_INIT -}; - /* mutex protects atomicity of extending measurement list * and extending the TPM PCR aggregate. Since tpm_extend can take * long (and the tpm driver uses a mutex), we can't use the spinlock. @@ -45,8 +38,10 @@ struct ima_h_table ima_htable = { static DEFINE_MUTEX(ima_extend_list_mutex); /* lookup up the digest value in the hash table, and return the entry */ -static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value, - int pcr) +static struct ima_queue_entry *ima_lookup_digest_entry + (struct ima_namespace *ns, + u8 *digest_value, + int pcr) { struct ima_queue_entry *qe, *ret = NULL; unsigned int key; @@ -54,7 +49,7 @@ static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value, key = ima_hash_key(digest_value); rcu_read_lock(); - hlist_for_each_entry_rcu(qe, &ima_htable.queue[key], hnext) { + hlist_for_each_entry_rcu(qe, &ns->ima_htable.queue[key], hnext) { rc = memcmp(qe->entry->digests[ima_hash_algo_idx].digest, digest_value, hash_digest_size[ima_hash_algo]); if ((rc == 0) && (qe->entry->pcr == pcr)) { @@ -90,7 +85,8 @@ static int get_binary_runtime_size(struct ima_template_entry *entry) * * (Called with ima_extend_list_mutex held.) */ -static int ima_add_digest_entry(struct ima_template_entry *entry, +static int ima_add_digest_entry(struct ima_namespace *ns, + struct ima_template_entry *entry, bool update_htable) { struct ima_queue_entry *qe; @@ -106,10 +102,12 @@ static int ima_add_digest_entry(struct ima_template_entry *entry, INIT_LIST_HEAD(&qe->later); list_add_tail_rcu(&qe->later, &ima_measurements); - atomic_long_inc(&ima_htable.len); + atomic_long_inc(&ns->ima_htable.len); if (update_htable) { key = ima_hash_key(entry->digests[ima_hash_algo_idx].digest); - hlist_add_head_rcu(&qe->hnext, &ima_htable.queue[key]); + hlist_add_head_rcu(&qe->hnext, &ns->ima_htable.queue[key]); + } else { + INIT_HLIST_NODE(&qe->hnext); } if (binary_runtime_size != ULONG_MAX) { @@ -156,7 +154,8 @@ static int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr) * kexec, maintain the total memory size required for serializing the * binary_runtime_measurements. */ -int ima_add_template_entry(struct ima_template_entry *entry, int violation, +int ima_add_template_entry(struct ima_namespace *ns, + struct ima_template_entry *entry, int violation, const char *op, struct inode *inode, const unsigned char *filename) { @@ -169,14 +168,14 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation, mutex_lock(&ima_extend_list_mutex); if (!violation && !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE)) { - if (ima_lookup_digest_entry(digest, entry->pcr)) { + if (ima_lookup_digest_entry(ns, digest, entry->pcr)) { audit_cause = "hash_exists"; result = -EEXIST; goto out; } } - result = ima_add_digest_entry(entry, + result = ima_add_digest_entry(ns, entry, !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE)); if (result < 0) { audit_cause = "ENOMEM"; @@ -201,12 +200,13 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation, return result; } -int ima_restore_measurement_entry(struct ima_template_entry *entry) +int ima_restore_measurement_entry(struct ima_namespace *ns, + struct ima_template_entry *entry) { int result = 0; mutex_lock(&ima_extend_list_mutex); - result = ima_add_digest_entry(entry, 0); + result = ima_add_digest_entry(ns, entry, 0); mutex_unlock(&ima_extend_list_mutex); return result; } diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c index db1ad6d7a57f..e5c33a3f0296 100644 --- a/security/integrity/ima/ima_template.c +++ b/security/integrity/ima/ima_template.c @@ -404,7 +404,8 @@ static int ima_restore_template_data(struct ima_template_desc *template_desc, } /* Restore the serialized binary measurement list without extending PCRs. */ -int ima_restore_measurement_list(loff_t size, void *buf) +int ima_restore_measurement_list(struct ima_namespace *ns, + loff_t size, void *buf) { char template_name[MAX_TEMPLATE_NAME_LEN]; unsigned char zero[TPM_DIGEST_SIZE] = { 0 }; @@ -520,7 +521,7 @@ int ima_restore_measurement_list(loff_t size, void *buf) entry->pcr = !ima_canonical_fmt ? *(u32 *)(hdr[HDR_PCR].data) : le32_to_cpu(*(__le32 *)(hdr[HDR_PCR].data)); - ret = ima_restore_measurement_entry(entry); + ret = ima_restore_measurement_entry(ns, entry); if (ret < 0) break; From patchwork Wed Mar 2 13:46:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766047 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0612EC43219 for ; Wed, 2 Mar 2022 13:50:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242491AbiCBNvg (ORCPT ); Wed, 2 Mar 2022 08:51:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242380AbiCBNvI (ORCPT ); Wed, 2 Mar 2022 08:51:08 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E53A6C558B; Wed, 2 Mar 2022 05:50:24 -0800 (PST) Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222CHWFU030291; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=9oPBiRGh40X/4zS0dakvZoES3JUeduaKeVg6NuTgpE8=; b=YkS0O77RXGMRcTkslgARBuzRV+OEOlxfPgeG+e6twwgo8vMNVTiDkwLlu6leRGZfbXeG QZQQknJynVxwdwpYmdF/a+eEctV2oqGiVzkbs0hn9a5x82YcWYh8y0JUKxnuWwMexyYp 0nbAWIlzaK6WKqsifWjoj08tjvMdXredeH2otLlgyCarPcSwD7YvE+7SbC6H3uZ1niL6 QnJuqux7kDr8AuhcJJr2q8jb+fRKPfE+Ez1mH4EVdL1bdUryfJSc+oaEvjpdmu9E9EyM 8g/oKJLsEyLD/BudIxSe+XmuiGFEoDNRRLthMsr4blX1nYi1PY66qyeVTJ7hV3XgCSxC Kg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej38v9p93-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:01 +0000 Received: from m0098404.ppops.net (m0098404.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DGQC0013269; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma04wdc.us.ibm.com (1a.90.2fa9.ip4.static.sl-reverse.com [169.47.144.26]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ej38v9p88-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from pps.filterd (ppma04wdc.us.ibm.com [127.0.0.1]) by ppma04wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222Dn8YT008499; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma04wdc.us.ibm.com with ESMTP id 3eftrrppqf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222Dnw4D47645060 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:58 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 01E64112070; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D90D411206F; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger Subject: [PATCH v11 07/27] ima: Move measurement list related variables into ima_namespace Date: Wed, 2 Mar 2022 08:46:42 -0500 Message-Id: <20220302134703.1273041-8-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: EqwDN5T28GmHyGSrYATGhyB5J2NMqKJV X-Proofpoint-GUID: HUrdvaFoO_EGfa2yPGuNNdhNCkCkS8yQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 suspectscore=0 clxscore=1015 impostorscore=0 adultscore=0 malwarescore=0 priorityscore=1501 spamscore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Move measurement list related variables into the ima_namespace. This way a front-end like securityfs can show the measurement list inside an IMA namespace. Also, in order for kexec to allocate memory for the existing measurement list, the measurement list memory size is stored in the binary_runtime_size variable. To avoid special-casing init_ima_ns, as much as possible, move it into the ima_namespace. Signed-off-by: Stefan Berger Reviewed-by: Mimi Zohar --- security/integrity/ima/ima.h | 5 +++-- security/integrity/ima/ima_fs.c | 6 ++++-- security/integrity/ima/ima_init_ima_ns.c | 5 +++++ security/integrity/ima/ima_kexec.c | 12 ++++++----- security/integrity/ima/ima_queue.c | 27 +++++++++++------------- 5 files changed, 31 insertions(+), 24 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 78798cfcf46c..82e8af2bf698 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -106,7 +106,6 @@ struct ima_queue_entry { struct list_head later; /* place in ima_measurements list */ struct ima_template_entry *entry; }; -extern struct list_head ima_measurements; /* list of all measurements */ /* Some details preceding the binary serialized measurement list */ struct ima_kexec_hdr { @@ -136,6 +135,8 @@ struct ima_namespace { struct ima_rule_entry *arch_policy_entry; struct ima_h_table ima_htable; + struct list_head ima_measurements; /* list of all measurements */ + unsigned long binary_runtime_size; /* used by init_ima_ns */ } __randomize_layout; extern struct ima_namespace init_ima_ns; @@ -186,7 +187,7 @@ int ima_restore_measurement_entry(struct ima_namespace *ns, int ima_restore_measurement_list(struct ima_namespace *ns, loff_t bufsize, void *buf); int ima_measurements_show(struct seq_file *m, void *v); -unsigned long ima_get_binary_runtime_size(void); +unsigned long ima_get_binary_runtime_size(struct ima_namespace *ns); int ima_init_template(void); void ima_init_template_list(void); int __init ima_init_digests(void); diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index dca7fe32d65e..5ef0e2b2cf64 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -80,12 +80,13 @@ static const struct file_operations ima_measurements_count_ops = { /* returns pointer to hlist_node */ static void *ima_measurements_start(struct seq_file *m, loff_t *pos) { + struct ima_namespace *ns = &init_ima_ns; loff_t l = *pos; struct ima_queue_entry *qe; /* we need a lock since pos could point beyond last element */ rcu_read_lock(); - list_for_each_entry_rcu(qe, &ima_measurements, later) { + list_for_each_entry_rcu(qe, &ns->ima_measurements, later) { if (!l--) { rcu_read_unlock(); return qe; @@ -97,6 +98,7 @@ static void *ima_measurements_start(struct seq_file *m, loff_t *pos) static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos) { + struct ima_namespace *ns = &init_ima_ns; struct ima_queue_entry *qe = v; /* lock protects when reading beyond last element @@ -107,7 +109,7 @@ static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos) rcu_read_unlock(); (*pos)++; - return (&qe->later == &ima_measurements) ? NULL : qe; + return (&qe->later == &ns->ima_measurements) ? NULL : qe; } static void ima_measurements_stop(struct seq_file *m, void *v) diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c index 1945fa8cfc4d..a7477072c587 100644 --- a/security/integrity/ima/ima_init_ima_ns.c +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -20,6 +20,11 @@ static int ima_init_namespace(struct ima_namespace *ns) atomic_long_set(&ns->ima_htable.len, 0); atomic_long_set(&ns->ima_htable.violations, 0); memset(&ns->ima_htable.queue, 0, sizeof(ns->ima_htable.queue)); + INIT_LIST_HEAD(&ns->ima_measurements); + if (IS_ENABLED(CONFIG_IMA_KEXEC) && ns == &init_ima_ns) + ns->binary_runtime_size = 0; + else + ns->binary_runtime_size = ULONG_MAX; return 0; } diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index d7cc5cca6f84..fd5da31f19ee 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -15,7 +15,8 @@ #include "ima.h" #ifdef CONFIG_IMA_KEXEC -static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer, +static int ima_dump_measurement_list(struct ima_namespace *ns, + unsigned long *buffer_size, void **buffer, unsigned long segment_size) { struct ima_queue_entry *qe; @@ -36,7 +37,7 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer, memset(&khdr, 0, sizeof(khdr)); khdr.version = 1; - list_for_each_entry_rcu(qe, &ima_measurements, later) { + list_for_each_entry_rcu(qe, &ns->ima_measurements, later) { if (file.count < file.size) { khdr.count++; ima_measurements_show(&file, qe); @@ -84,6 +85,7 @@ void ima_add_kexec_buffer(struct kimage *image) struct kexec_buf kbuf = { .image = image, .buf_align = PAGE_SIZE, .buf_min = 0, .buf_max = ULONG_MAX, .top_down = true }; + struct ima_namespace *ns = &init_ima_ns; unsigned long binary_runtime_size; /* use more understandable variable names than defined in kbuf */ @@ -96,11 +98,11 @@ void ima_add_kexec_buffer(struct kimage *image) * Reserve an extra half page of memory for additional measurements * added during the kexec load. */ - binary_runtime_size = ima_get_binary_runtime_size(); + binary_runtime_size = ima_get_binary_runtime_size(ns); if (binary_runtime_size >= ULONG_MAX - PAGE_SIZE) kexec_segment_size = ULONG_MAX; else - kexec_segment_size = ALIGN(ima_get_binary_runtime_size() + + kexec_segment_size = ALIGN(ima_get_binary_runtime_size(ns) + PAGE_SIZE / 2, PAGE_SIZE); if ((kexec_segment_size == ULONG_MAX) || ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages() / 2)) { @@ -108,7 +110,7 @@ void ima_add_kexec_buffer(struct kimage *image) return; } - ima_dump_measurement_list(&kexec_buffer_size, &kexec_buffer, + ima_dump_measurement_list(ns, &kexec_buffer_size, &kexec_buffer, kexec_segment_size); if (!kexec_buffer) { pr_err("Not enough memory for the kexec measurement buffer.\n"); diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index 43961d5cd2ef..0355c2b0932c 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -24,13 +24,6 @@ /* pre-allocated array of tpm_digest structures to extend a PCR */ static struct tpm_digest *digests; -LIST_HEAD(ima_measurements); /* list of all measurements */ -#ifdef CONFIG_IMA_KEXEC -static unsigned long binary_runtime_size; -#else -static unsigned long binary_runtime_size = ULONG_MAX; -#endif - /* mutex protects atomicity of extending measurement list * and extending the TPM PCR aggregate. Since tpm_extend can take * long (and the tpm driver uses a mutex), we can't use the spinlock. @@ -100,7 +93,7 @@ static int ima_add_digest_entry(struct ima_namespace *ns, qe->entry = entry; INIT_LIST_HEAD(&qe->later); - list_add_tail_rcu(&qe->later, &ima_measurements); + list_add_tail_rcu(&qe->later, &ns->ima_measurements); atomic_long_inc(&ns->ima_htable.len); if (update_htable) { @@ -110,12 +103,14 @@ static int ima_add_digest_entry(struct ima_namespace *ns, INIT_HLIST_NODE(&qe->hnext); } - if (binary_runtime_size != ULONG_MAX) { + if (ns->binary_runtime_size != ULONG_MAX) { int size; size = get_binary_runtime_size(entry); - binary_runtime_size = (binary_runtime_size < ULONG_MAX - size) ? - binary_runtime_size + size : ULONG_MAX; + ns->binary_runtime_size = + (ns->binary_runtime_size < ULONG_MAX - size) + ? ns->binary_runtime_size + size + : ULONG_MAX; } return 0; } @@ -123,14 +118,16 @@ static int ima_add_digest_entry(struct ima_namespace *ns, /* * Return the amount of memory required for serializing the * entire binary_runtime_measurement list, including the ima_kexec_hdr - * structure. + * structure. Carrying the measurement list across kexec is limited + * to init_ima_ns. */ -unsigned long ima_get_binary_runtime_size(void) +unsigned long ima_get_binary_runtime_size(struct ima_namespace *ns) { - if (binary_runtime_size >= (ULONG_MAX - sizeof(struct ima_kexec_hdr))) + if (ns->binary_runtime_size >= + (ULONG_MAX - sizeof(struct ima_kexec_hdr))) return ULONG_MAX; else - return binary_runtime_size + sizeof(struct ima_kexec_hdr); + return ns->binary_runtime_size + sizeof(struct ima_kexec_hdr); } static int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr) From patchwork Wed Mar 2 13:46:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766051 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2C14C433EF for ; Wed, 2 Mar 2022 13:50:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242558AbiCBNvj (ORCPT ); Wed, 2 Mar 2022 08:51:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242435AbiCBNv2 (ORCPT ); Wed, 2 Mar 2022 08:51:28 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D585FBB57E; Wed, 2 Mar 2022 05:50:25 -0800 (PST) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222CJGBg030686; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=LU0JvP2cqapWU92webgcHAEwLhlV8qlim8yGnD9+XXQ=; b=Ig18AZs6ZWYGpMddUFt+l7QBkVOYQiHB0mrK4YhOC7VWRylK0OUQRqPRergrgvHlbYnQ 1etEDGpYRNo+3aiBoNE/5HHdxqtNdvwZeToznIaAwgAPzWeHaZdCIuFqJf3HbvkpGuhZ 6dJHSOSKuhtNLx/DNnGG0nVWZLoIJTjt0BwqPKS0Up97fJ5vMzcjMX6fhoPxWPly6doy tmSGjQ6ijJ1igEFFi2woqTj4PxNofYX+WAzW4F6GM/ZtdER9ABKp1X9ahdn54M1Ggyh5 4cIwAsdQHU7OtdjV6ATgz1w6DaxbVTr3HQ9/rPz0/4WunNx3LNhyqQFq63mY9h2eUaMn vw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej8fj9u0b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222CutgU005564; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej8fj9u00-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from pps.filterd (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222Dn94d031206; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma02wdc.us.ibm.com with ESMTP id 3efbua4v6u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnwoT56295750 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:58 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 23BAC11206B; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 06D6D112072; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:57 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger , Christian Brauner Subject: [PATCH v11 08/27] ima: Move some IMA policy and filesystem related variables into ima_namespace Date: Wed, 2 Mar 2022 08:46:43 -0500 Message-Id: <20220302134703.1273041-9-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0MM2wBAIErDTykOWIEvKbip2ExyzdZN3 X-Proofpoint-ORIG-GUID: ltuZziWwk8FkXnFSCJYAxQPQUkMmL1in X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 suspectscore=0 adultscore=0 clxscore=1015 impostorscore=0 malwarescore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Move the variables ima_write_mutex, ima_fs_flag, and valid_policy, which are related to updating the IMA policy, into the ima_namespace. This way each IMA namespace can set these variables independently in its instance of securityfs. Signed-off-by: Stefan Berger Acked-by: Christian Brauner Reviewed-by: Mimi Zohar --- security/integrity/ima/ima.h | 5 ++++ security/integrity/ima/ima_fs.c | 32 +++++++++++------------- security/integrity/ima/ima_init_ima_ns.c | 4 +++ 3 files changed, 23 insertions(+), 18 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 82e8af2bf698..a144edfdb9a1 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -137,6 +137,11 @@ struct ima_namespace { struct ima_h_table ima_htable; struct list_head ima_measurements; /* list of all measurements */ unsigned long binary_runtime_size; /* used by init_ima_ns */ + + /* securityfs support related variables */ + struct mutex ima_write_mutex; + unsigned long ima_fs_flags; + int valid_policy; } __randomize_layout; extern struct ima_namespace init_ima_ns; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 5ef0e2b2cf64..4cf786f0bba8 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -24,8 +24,6 @@ #include "ima.h" -static DEFINE_MUTEX(ima_write_mutex); - bool ima_canonical_fmt; static int __init default_canonical_fmt_setup(char *str) { @@ -36,8 +34,6 @@ static int __init default_canonical_fmt_setup(char *str) } __setup("ima_canonical_fmt", default_canonical_fmt_setup); -static int valid_policy = 1; - static ssize_t ima_show_htable_value(char __user *buf, size_t count, loff_t *ppos, atomic_long_t *val) { @@ -338,7 +334,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, goto out; } - result = mutex_lock_interruptible(&ima_write_mutex); + result = mutex_lock_interruptible(&ns->ima_write_mutex); if (result < 0) goto out_free; @@ -353,12 +349,12 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, } else { result = ima_parse_add_rule(ns, data); } - mutex_unlock(&ima_write_mutex); + mutex_unlock(&ns->ima_write_mutex); out_free: kfree(data); out: if (result < 0) - valid_policy = 0; + ns->valid_policy = 0; return result; } @@ -375,8 +371,6 @@ enum ima_fs_flags { IMA_FS_BUSY, }; -static unsigned long ima_fs_flags; - #ifdef CONFIG_IMA_READ_POLICY static const struct seq_operations ima_policy_seqops = { .start = ima_policy_start, @@ -391,6 +385,8 @@ static const struct seq_operations ima_policy_seqops = { */ static int ima_open_policy(struct inode *inode, struct file *filp) { + struct ima_namespace *ns = &init_ima_ns; + if (!(filp->f_flags & O_WRONLY)) { #ifndef CONFIG_IMA_READ_POLICY return -EACCES; @@ -402,7 +398,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp) return seq_open(filp, &ima_policy_seqops); #endif } - if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags)) + if (test_and_set_bit(IMA_FS_BUSY, &ns->ima_fs_flags)) return -EBUSY; return 0; } @@ -416,25 +412,25 @@ static int ima_open_policy(struct inode *inode, struct file *filp) */ static int ima_release_policy(struct inode *inode, struct file *file) { - const char *cause = valid_policy ? "completed" : "failed"; struct ima_namespace *ns = &init_ima_ns; + const char *cause = ns->valid_policy ? "completed" : "failed"; if ((file->f_flags & O_ACCMODE) == O_RDONLY) return seq_release(inode, file); - if (valid_policy && ima_check_policy(ns) < 0) { + if (ns->valid_policy && ima_check_policy(ns) < 0) { cause = "failed"; - valid_policy = 0; + ns->valid_policy = 0; } pr_info("policy update %s\n", cause); integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, - "policy_update", cause, !valid_policy, 0); + "policy_update", cause, !ns->valid_policy, 0); - if (!valid_policy) { + if (!ns->valid_policy) { ima_delete_rules(ns); - valid_policy = 1; - clear_bit(IMA_FS_BUSY, &ima_fs_flags); + ns->valid_policy = 1; + clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); return 0; } @@ -443,7 +439,7 @@ static int ima_release_policy(struct inode *inode, struct file *file) securityfs_remove(ima_policy); ima_policy = NULL; #elif defined(CONFIG_IMA_WRITE_POLICY) - clear_bit(IMA_FS_BUSY, &ima_fs_flags); + clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); #elif defined(CONFIG_IMA_READ_POLICY) inode->i_mode &= ~S_IWUSR; #endif diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c index a7477072c587..425eed1c6838 100644 --- a/security/integrity/ima/ima_init_ima_ns.c +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -26,6 +26,10 @@ static int ima_init_namespace(struct ima_namespace *ns) else ns->binary_runtime_size = ULONG_MAX; + mutex_init(&ns->ima_write_mutex); + ns->valid_policy = 1; + ns->ima_fs_flags = 0; + return 0; } From patchwork Wed Mar 2 13:46:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766049 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B292C433FE for ; Wed, 2 Mar 2022 13:50:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242519AbiCBNvh (ORCPT ); Wed, 2 Mar 2022 08:51:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242428AbiCBNv2 (ORCPT ); Wed, 2 Mar 2022 08:51:28 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79B1DC55A3; Wed, 2 Mar 2022 05:50:25 -0800 (PST) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222DmSAg013181; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=K5NXUSoSyLuz4AI/royCZOMTb8jgxNpPPQg7laYI3NU=; b=HzMwemp77/9hXGKZwk49ElfwiFj05l0YybVdjL+lBz8hjJ9R8f5zYHYBDTvORVo0/vSP v/12gnM0SytZq4sZlLCg8jqOWDmDCRTqEqAgq4DT+9UC+rXNmFu3OW6Vm5e094z8jNd5 JnJWyP7NmOR/dt6SRq64xq0shfVKq/MiQFwfBcSxhzpAN/YpZiJLKA6qFZo9bGcIP8BZ uD1q+BWdBV/uWE/tnh1pg9DgwX9/YO9XzpHESuvWb8cl0YZqQTuqpUssv2PY5VvAtBCs RdJ0djG8hv6ArAmLC4OhWL10WPFeagC5OkW9BRcXpTO8NmpIdoUW4W+/WrgWrLuWsAD8 NQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej9st80p6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from m0098413.ppops.net (m0098413.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222DmfYL013448; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma05wdc.us.ibm.com (1b.90.2fa9.ip4.static.sl-reverse.com [169.47.144.27]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej9st80nx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from pps.filterd (ppma05wdc.us.ibm.com [127.0.0.1]) by ppma05wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222Dn6SX032076; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma05wdc.us.ibm.com with ESMTP id 3ej75rh31s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222Dnw4Z56295752 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:58 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4501F11206B; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2888711206F; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger , Christian Brauner Subject: [PATCH v11 09/27] ima: Move IMA securityfs files into ima_namespace or onto stack Date: Wed, 2 Mar 2022 08:46:44 -0500 Message-Id: <20220302134703.1273041-10-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 7fQa9FRveqdIe_f4DVfTJGCHpRMooQhd X-Proofpoint-ORIG-GUID: fr3QNECMG4LGNfnD1_SG8JRjlASyz-gV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 suspectscore=0 mlxscore=0 adultscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Earlier we simplified how dentry creation and deletion is manged in securityfs. This allows us to move IMA securityfs files from global variables directly into ima_fs_ns_init() itself. We can now rely on those dentries to be cleaned up when the securityfs instance is cleaned when the last reference to it is dropped. Things are slightly different for the initial IMA namespace. In contrast to non-initial IMA namespaces it has pinning logic binding the lifetime of the securityfs superblock to created dentries. We need to keep this behavior to not regress userspace. Since IMA never removes most of the securityfs files the initial securityfs instance stays pinned. This also means even for the initial IMA namespace we don't need to keep references to these dentries anywhere. The ima_policy file is the exception since IMA can end up removing it on systems that don't allow reading or extending the IMA custom policy. Signed-off-by: Stefan Berger Acked-by: Christian Brauner Reviewed-by: Mimi Zohar --- v9: - Revert renaming of ima_policy to policy_dentry --- security/integrity/ima/ima.h | 2 ++ security/integrity/ima/ima_fs.c | 37 ++++++++++++++++++--------------- 2 files changed, 22 insertions(+), 17 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index a144edfdb9a1..b35c8504ef87 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -142,6 +142,8 @@ struct ima_namespace { struct mutex ima_write_mutex; unsigned long ima_fs_flags; int valid_policy; + + struct dentry *ima_policy; } __randomize_layout; extern struct ima_namespace init_ima_ns; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 4cf786f0bba8..89d3113ceda1 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -359,14 +359,6 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, return result; } -static struct dentry *ima_dir; -static struct dentry *ima_symlink; -static struct dentry *binary_runtime_measurements; -static struct dentry *ascii_runtime_measurements; -static struct dentry *runtime_measurements_count; -static struct dentry *violations; -static struct dentry *ima_policy; - enum ima_fs_flags { IMA_FS_BUSY, }; @@ -436,8 +428,8 @@ static int ima_release_policy(struct inode *inode, struct file *file) ima_update_policy(ns); #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY) - securityfs_remove(ima_policy); - ima_policy = NULL; + securityfs_remove(ns->ima_policy); + ns->ima_policy = NULL; #elif defined(CONFIG_IMA_WRITE_POLICY) clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); #elif defined(CONFIG_IMA_READ_POLICY) @@ -454,8 +446,14 @@ static const struct file_operations ima_measure_policy_ops = { .llseek = generic_file_llseek, }; -int __init ima_fs_init(void) +static int __init ima_fs_ns_init(struct ima_namespace *ns) { + struct dentry *ima_dir; + struct dentry *ima_symlink = NULL; + struct dentry *binary_runtime_measurements = NULL; + struct dentry *ascii_runtime_measurements = NULL; + struct dentry *runtime_measurements_count = NULL; + struct dentry *violations = NULL; int ret; ima_dir = securityfs_create_dir("ima", integrity_dir); @@ -504,17 +502,17 @@ int __init ima_fs_init(void) goto out; } - ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS, - ima_dir, NULL, - &ima_measure_policy_ops); - if (IS_ERR(ima_policy)) { - ret = PTR_ERR(ima_policy); + ns->ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS, + ima_dir, NULL, + &ima_measure_policy_ops); + if (IS_ERR(ns->ima_policy)) { + ret = PTR_ERR(ns->ima_policy); goto out; } return 0; out: - securityfs_remove(ima_policy); + securityfs_remove(ns->ima_policy); securityfs_remove(violations); securityfs_remove(runtime_measurements_count); securityfs_remove(ascii_runtime_measurements); @@ -524,3 +522,8 @@ int __init ima_fs_init(void) return ret; } + +int __init ima_fs_init(void) +{ + return ima_fs_ns_init(&init_ima_ns); +} From patchwork Wed Mar 2 13:46:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12766038 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AFB9C4167B for ; Wed, 2 Mar 2022 13:50:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242357AbiCBNvM (ORCPT ); Wed, 2 Mar 2022 08:51:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242370AbiCBNvH (ORCPT ); Wed, 2 Mar 2022 08:51:07 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C489171CB8; Wed, 2 Mar 2022 05:50:23 -0800 (PST) Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 222Cs5pR032064; Wed, 2 Mar 2022 13:50:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=Ok/ZVa0Zn5afwWWIsvo0VeyoQjq4ZT6PHqYNBt3roYQ=; b=sXrgqyRnA1KvmUdegCMZgJm6+uV9wLoRRN8Ar9VANWhw52T76uc0E2dhQOUM4swGB1uA TO18Zy7yFwBwuXp4OE3fxX1sBUDLbvh0EfMVf5d7z7biRZhPbhJYiXpMYnCEjyUINaeS sqxmwDX6hV+ZxG9HAcmkPU01hkI51uHTiIkcrTW/K8DTm1IoB+c6jR31I0e/hcwMtOF0 gQjljWxzmBIC9RX5Dnz10vCfhmLwKzizkIp2mI2//d+snEXhxPXwn0dCiehqCZvQePQY DU/S7RPVDBVjmF0R06iCnyYcW82saRgqWmxm6XLIOB+FFgA7C0naVpCdiJVL32tSzXNk uw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej90as4jn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:01 +0000 Received: from m0098416.ppops.net (m0098416.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 222CuaLT003443; Wed, 2 Mar 2022 13:50:00 GMT Received: from ppma03wdc.us.ibm.com (ba.79.3fa9.ip4.static.sl-reverse.com [169.63.121.186]) by mx0b-001b2d01.pphosted.com with ESMTP id 3ej90as4j6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:50:00 +0000 Received: from pps.filterd (ppma03wdc.us.ibm.com [127.0.0.1]) by ppma03wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 222DnGCt031344; Wed, 2 Mar 2022 13:49:59 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma03wdc.us.ibm.com with ESMTP id 3efbua4v0e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Mar 2022 13:49:59 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 222DnwFK56295756 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Mar 2022 13:49:58 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 668B711206F; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 49B56112070; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 2 Mar 2022 13:49:58 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger Subject: [PATCH v11 10/27] ima: Move ima_lsm_policy_notifier into ima_namespace Date: Wed, 2 Mar 2022 08:46:45 -0500 Message-Id: <20220302134703.1273041-11-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220302134703.1273041-1-stefanb@linux.ibm.com> References: <20220302134703.1273041-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: b1rdC8jV0YIc0ivEo2Jpf59fbbf7oVf7 X-Proofpoint-GUID: kAFxuh3WexSBomtopmDRi4RNR16JVJcI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-02_06,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 phishscore=0 clxscore=1015 mlxlogscore=999 lowpriorityscore=0 spamscore=0 adultscore=0 bulkscore=0 suspectscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203020057 Precedence: bulk List-ID: Move the ima_lsm_policy_notifier into the ima_namespace. Each IMA namespace can now register its own LSM policy change notifier callback. The policy change notifier for the init_ima_ns still remains in init_ima() and therefore handle the registration of the callback for all other namespaces in init_ima_namespace(). Rate-limit the kernel warning 'rule for LSM