From patchwork Fri Jul 26 23:39:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 11062029 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 31C7D13B1 for ; Fri, 26 Jul 2019 23:39:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2798A28B20 for ; Fri, 26 Jul 2019 23:39:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1B34D28B21; Fri, 26 Jul 2019 23:39:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5359128B3C for ; Fri, 26 Jul 2019 23:39:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727805AbfGZXjh (ORCPT ); Fri, 26 Jul 2019 19:39:37 -0400 Received: from sonic314-27.consmr.mail.ne1.yahoo.com ([66.163.189.153]:45310 "EHLO sonic314-27.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727813AbfGZXjh (ORCPT ); Fri, 26 Jul 2019 19:39:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1564184375; bh=pBDl/1vQPZOTGhA3y1ZBLm/3xBXXHuqBGnmdEc2nJIk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=TTUDxSJQF+8o0CKI9PlbXN+aBhcu8qYuu5cGVQ7X7Y0TURldVHma6p9RO5wKhT4NlD0d2xuCPO6EI5N4tslAdFAmfwxTCBsg5ei33tUqRy/3N3yaYfBwe0CQK2FyzS/bSfC5awmsU3+zTdTAu33ZNrWLcxia8uam1F3RV/o8OoE60LN2S6ncq9sni33FoTgwyvgbYcioEw9iu5c/9ft72RtEMjUikrWv5pmLM1qhS5To6mAaO8FS0SLputqVGd6WBkeyvMP3Ju6EMI3hZ7Jts8M1+HMbKO5ILbda9kGYPMMmDYwtc6N28Lw0dmBJ43/pJYE9Oem0X9+WwwPfFzyC+Q== X-YMail-OSG: 0DX1N34VM1khdQpozTpduRTfzQ2.m_FOXVWmsHrjKqGVRPV5mv1hzv6UuBmIpAF .7vJZ3..SE6VyVxBkB593LN9kRgz5qB0VyeFBfH.MlSck.lq9oWltxECma78saaXC.WqhMWbnnM0 ZbKbHQWLBbK6NI7ZNmcB5VqjOFfB_Oo6G2VikmcUecURdULLhO_Ga4oXW3C7oDpGGhUYobyMjlVB rQpezvNirLFjqa9O0YfBvzIbweH7jFDnsngkC6yB0_TOgxczaPs.ChsoRTzuY528IV_G3nscB11n hCVSrbwkflotnqCKYko2QpBf6HPufBzWIVNhdb75s2rzHCsz2SyLN7BY1AhoI7eeJ_sDpWKWRLwG qgfFY410tW.mkovR_TiePrh53fGOUhzJtsWc1C4ZD6mdPMIx2IOvG6enFDgnL8BJKQVz7MOmIVcL h1rZzf6vKV1OLbcM148oLAcgMI_1EKGHoUxzoA3SPgpcbBJjL06xPz9yZ_R9wryXHy3OdROXaHEj EoaHMRKecoQxoVrfQy_80d..KdCiYSuy9XLUQEzLbGBWabp69L9PwyLPujyoM2PbqM1rF4xCaRdV XNyFpZ9mUs8tRESs7HSO7yl5sjLUYJMi9QbH.zo2d.S.nfUyNwG.QKH75SAvbvB.1p.TysQq8cIi 7xdkq8GuE5GNrBNKvhuW7YhccRP9xFDguYU7PkXI2V3H.8ZX.GMxZqrQMf7pwwYBP1l2pXZsF_if H2HO5hAj.whmn7sYJ4cmzV0l4VDk_yBTmHHyqai_6k_uORMk5aRTtLd9G5_speTndhQBb.VJ0NkA aHmY7UyfkljGys3HgVcbZYW66qfzLA3vL5SHU18dAhgeBgnRCm7DjQorACSxwm.cYCLbHCfZ_Ku6 gq7KZY1PiQyorAOHyQ_vi2VEhR46vYdrGUO.r_10GEwzfyDu8twAVMPIYNGb_whSgVPrCcqFCEjy bVM32OC9npmHJ6WcKiBQm34mNjCZs_ALXMKAWtGB_.QmbvBCc04v.J0mocFjSXYpt6__1__qRA2f c.OpnVCiV1orxZACZh4nOFZmS7OOzUx3yUCRiOvpOYCqYJYAx0eXiSLPx6FOgvXMHmBJcDBF_UBN k0KU5yX9gV.whKRV1MPa5H.QA9bE0xeEyXOdVeYofRY9pN9klVTZFSx3YMAv5.99tLpfgtYXVbse Y_KOFydKSF9KIXzhsue6WsCddAvx4xPImjsjSw8hmLIgoPsXrBNJURORU0hbOphIFZGo6KV4eFZN uf.dzSgFY3JW4KWbQxHdPLet9320wr83sjj98E9wU6g-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic314.consmr.mail.ne1.yahoo.com with HTTP; Fri, 26 Jul 2019 23:39:35 +0000 Received: by smtp419.mail.ne1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID faf3134ce3e2400a4a56efaeaba728ba; Fri, 26 Jul 2019 23:39:31 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: [PATCH 05/27] LSM: Use lsmblob in security_kernel_act_as Date: Fri, 26 Jul 2019 16:39:01 -0700 Message-Id: <20190726233923.2570-6-casey@schaufler-ca.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190726233923.2570-1-casey@schaufler-ca.com> References: <20190726233923.2570-1-casey@schaufler-ca.com> MIME-Version: 1.0 Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Change the security_kernel_act_as interface to use a lsmblob structure in place of the single u32 secid in support of module stacking. Change it's only caller, set_security_override, to do the same. Change that one's only caller, set_security_override_from_ctx, to call it with the new parameter type. Reviewed-by: Kees Cook Reviewed-by: John Johansen Signed-off-by: Casey Schaufler --- include/linux/cred.h | 3 ++- include/linux/security.h | 5 +++-- kernel/cred.c | 10 ++++++---- security/security.c | 14 ++++++++++++-- 4 files changed, 23 insertions(+), 9 deletions(-) diff --git a/include/linux/cred.h b/include/linux/cred.h index efb6edf32de7..9a21c376ed97 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -22,6 +22,7 @@ struct cred; struct inode; +struct lsmblob; /* * COW Supplementary groups list @@ -165,7 +166,7 @@ extern const struct cred *override_creds(const struct cred *); extern void revert_creds(const struct cred *); extern struct cred *prepare_kernel_cred(struct task_struct *); extern int change_create_files_as(struct cred *, struct inode *); -extern int set_security_override(struct cred *, u32); +extern int set_security_override(struct cred *, struct lsmblob *); extern int set_security_override_from_ctx(struct cred *, const char *); extern int set_create_files_as(struct cred *, struct inode *); extern int cred_fscmp(const struct cred *, const struct cred *); diff --git a/include/linux/security.h b/include/linux/security.h index 4f8b478bc3a1..313e45a3cac3 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -388,7 +388,7 @@ void security_cred_free(struct cred *cred); int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp); void security_transfer_creds(struct cred *new, const struct cred *old); void security_cred_getsecid(const struct cred *c, u32 *secid); -int security_kernel_act_as(struct cred *new, u32 secid); +int security_kernel_act_as(struct cred *new, struct lsmblob *blob); int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_module_request(char *kmod_name); int security_kernel_load_data(enum kernel_load_data_id id); @@ -971,7 +971,8 @@ static inline void security_transfer_creds(struct cred *new, { } -static inline int security_kernel_act_as(struct cred *cred, u32 secid) +static inline int security_kernel_act_as(struct cred *cred, + struct lsmblob *blob) { return 0; } diff --git a/kernel/cred.c b/kernel/cred.c index 45d77284aed0..71c14dda107e 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -701,14 +701,14 @@ EXPORT_SYMBOL(prepare_kernel_cred); /** * set_security_override - Set the security ID in a set of credentials * @new: The credentials to alter - * @secid: The LSM security ID to set + * @blob: The LSM security information to set * * Set the LSM security ID in a set of credentials so that the subjective * security is overridden when an alternative set of credentials is used. */ -int set_security_override(struct cred *new, u32 secid) +int set_security_override(struct cred *new, struct lsmblob *blob) { - return security_kernel_act_as(new, secid); + return security_kernel_act_as(new, blob); } EXPORT_SYMBOL(set_security_override); @@ -724,6 +724,7 @@ EXPORT_SYMBOL(set_security_override); */ int set_security_override_from_ctx(struct cred *new, const char *secctx) { + struct lsmblob blob; u32 secid; int ret; @@ -731,7 +732,8 @@ int set_security_override_from_ctx(struct cred *new, const char *secctx) if (ret < 0) return ret; - return set_security_override(new, secid); + lsmblob_init(&blob, secid); + return set_security_override(new, &blob); } EXPORT_SYMBOL(set_security_override_from_ctx); diff --git a/security/security.c b/security/security.c index fa6e425e6f29..fa7ab1334f22 100644 --- a/security/security.c +++ b/security/security.c @@ -1627,9 +1627,19 @@ void security_cred_getsecid(const struct cred *c, u32 *secid) } EXPORT_SYMBOL(security_cred_getsecid); -int security_kernel_act_as(struct cred *new, u32 secid) +int security_kernel_act_as(struct cred *new, struct lsmblob *blob) { - return call_int_hook(kernel_act_as, 0, new, secid); + struct security_hook_list *hp; + int rc; + + hlist_for_each_entry(hp, &security_hook_heads.kernel_act_as, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + rc = hp->hook.kernel_act_as(new, blob->secid[hp->lsmid->slot]); + if (rc != 0) + return rc; + } + return 0; } int security_kernel_create_files_as(struct cred *new, struct inode *inode)