From patchwork Wed May 22 22:28:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956721 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 9E3D776 for ; Wed, 22 May 2019 22:28:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B1F5F204BA for ; Wed, 22 May 2019 22:28:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A07CE205FC; Wed, 22 May 2019 22:28:16 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 338E9205C0 for ; Wed, 22 May 2019 22:28:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728050AbfEVW2M (ORCPT ); Wed, 22 May 2019 18:28:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50846 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725823AbfEVW2M (ORCPT ); Wed, 22 May 2019 18:28:12 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BC26E30821AE; Wed, 22 May 2019 22:28:11 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id C8E1B60BF1; Wed, 22 May 2019 22:28:10 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 1/7] keys: sparse: Fix key_fs[ug]id_changed() From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:10 +0100 Message-ID: <155856409010.10428.11692778420533145488.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Wed, 22 May 2019 22:28:11 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Sparse warnings are incurred by key_fs[ug]id_changed() due to unprotected accesses of tsk->cred, which is marked __rcu. Fix this by passing the new cred struct to these functions from commit_creds() rather than the task pointer. Signed-off-by: David Howells Reviewed-by: James Morris --- include/linux/key.h | 8 ++++---- kernel/cred.c | 4 ++-- security/keys/process_keys.c | 22 ++++++++++------------ 3 files changed, 16 insertions(+), 18 deletions(-) diff --git a/include/linux/key.h b/include/linux/key.h index 7099985e35a9..1f09aad1c98c 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -402,8 +402,8 @@ extern struct ctl_table key_sysctls[]; * the userspace interface */ extern int install_thread_keyring_to_cred(struct cred *cred); -extern void key_fsuid_changed(struct task_struct *tsk); -extern void key_fsgid_changed(struct task_struct *tsk); +extern void key_fsuid_changed(struct cred *new_cred); +extern void key_fsgid_changed(struct cred *new_cred); extern void key_init(void); #else /* CONFIG_KEYS */ @@ -418,8 +418,8 @@ extern void key_init(void); #define make_key_ref(k, p) NULL #define key_ref_to_ptr(k) NULL #define is_key_possessed(k) 0 -#define key_fsuid_changed(t) do { } while(0) -#define key_fsgid_changed(t) do { } while(0) +#define key_fsuid_changed(c) do { } while(0) +#define key_fsgid_changed(c) do { } while(0) #define key_init() do { } while(0) #endif /* CONFIG_KEYS */ diff --git a/kernel/cred.c b/kernel/cred.c index 45d77284aed0..3bd40de9e192 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -455,9 +455,9 @@ int commit_creds(struct cred *new) /* alter the thread keyring */ if (!uid_eq(new->fsuid, old->fsuid)) - key_fsuid_changed(task); + key_fsuid_changed(new); if (!gid_eq(new->fsgid, old->fsgid)) - key_fsgid_changed(task); + key_fsgid_changed(new); /* do it * RLIMIT_NPROC limits on user->processes have already been checked diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index f05f7125a7d5..ba5d3172cafe 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -293,28 +293,26 @@ static int install_session_keyring(struct key *keyring) /* * Handle the fsuid changing. */ -void key_fsuid_changed(struct task_struct *tsk) +void key_fsuid_changed(struct cred *new_cred) { /* update the ownership of the thread keyring */ - BUG_ON(!tsk->cred); - if (tsk->cred->thread_keyring) { - down_write(&tsk->cred->thread_keyring->sem); - tsk->cred->thread_keyring->uid = tsk->cred->fsuid; - up_write(&tsk->cred->thread_keyring->sem); + if (new_cred->thread_keyring) { + down_write(&new_cred->thread_keyring->sem); + new_cred->thread_keyring->uid = new_cred->fsuid; + up_write(&new_cred->thread_keyring->sem); } } /* * Handle the fsgid changing. */ -void key_fsgid_changed(struct task_struct *tsk) +void key_fsgid_changed(struct cred *new_cred) { /* update the ownership of the thread keyring */ - BUG_ON(!tsk->cred); - if (tsk->cred->thread_keyring) { - down_write(&tsk->cred->thread_keyring->sem); - tsk->cred->thread_keyring->gid = tsk->cred->fsgid; - up_write(&tsk->cred->thread_keyring->sem); + if (new_cred->thread_keyring) { + down_write(&new_cred->thread_keyring->sem); + new_cred->thread_keyring->gid = new_cred->fsgid; + up_write(&new_cred->thread_keyring->sem); } } From patchwork Wed May 22 22:28:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956723 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 DC44E76 for ; Wed, 22 May 2019 22:28:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ED363205C0 for ; Wed, 22 May 2019 22:28:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DAFC421F61; Wed, 22 May 2019 22:28:27 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 862CB205C0 for ; Wed, 22 May 2019 22:28:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728184AbfEVW2T (ORCPT ); Wed, 22 May 2019 18:28:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46910 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725823AbfEVW2S (ORCPT ); Wed, 22 May 2019 18:28:18 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7C4FD356F1; Wed, 22 May 2019 22:28:18 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id AD3D617AC6; Wed, 22 May 2019 22:28:17 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 2/7] keys: sparse: Fix incorrect RCU accesses From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:17 +0100 Message-ID: <155856409697.10428.15024260088836364169.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 22 May 2019 22:28:18 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Fix a pair of accesses that should be using RCU protection. rcu_dereference_protected() is needed to access task_struct::real_parent. current_cred() should be used to access current->cred. Signed-off-by: David Howells Reviewed-by: James Morris --- security/keys/keyctl.c | 3 ++- security/keys/request_key_auth.c | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 3e4053a217c3..0f947bcbad46 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -1524,7 +1524,8 @@ long keyctl_session_to_parent(void) ret = -EPERM; oldwork = NULL; - parent = me->real_parent; + parent = rcu_dereference_protected(me->real_parent, + lockdep_is_held(&tasklist_lock)); /* the parent mustn't be init and mustn't be a kernel thread */ if (parent->pid <= 1 || !parent->mm) diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c index bda6201c6c45..572c7a60473a 100644 --- a/security/keys/request_key_auth.c +++ b/security/keys/request_key_auth.c @@ -152,7 +152,7 @@ struct key *request_key_auth_new(struct key *target, const char *op, struct key *dest_keyring) { struct request_key_auth *rka, *irka; - const struct cred *cred = current->cred; + const struct cred *cred = current_cred(); struct key *authkey = NULL; char desc[20]; int ret = -ENOMEM; From patchwork Wed May 22 22:28:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956725 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 66F141395 for ; Wed, 22 May 2019 22:28:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7BC0C205C0 for ; Wed, 22 May 2019 22:28:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6EBD621F61; Wed, 22 May 2019 22:28:31 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 04DC0205C0 for ; Wed, 22 May 2019 22:28:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729155AbfEVW21 (ORCPT ); Wed, 22 May 2019 18:28:27 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50912 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726781AbfEVW20 (ORCPT ); Wed, 22 May 2019 18:28:26 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 350DD30001DD; Wed, 22 May 2019 22:28:26 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id 616A2544EF; Wed, 22 May 2019 22:28:25 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 3/7] keys: sparse: Fix kdoc mismatches From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:23 +0100 Message-ID: <155856410370.10428.4854212353631906601.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Wed, 22 May 2019 22:28:26 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Fix some kdoc argument description mismatches reported by sparse and give keyring_restrict() a description. Signed-off-by: David Howells cc: Mat Martineau Reviewed-by: James Morris --- security/keys/keyring.c | 10 +++++++--- security/keys/request_key.c | 2 +- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/security/keys/keyring.c b/security/keys/keyring.c index e14f09e3a4b0..5b218b270598 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -520,7 +520,7 @@ EXPORT_SYMBOL(keyring_alloc); * @keyring: The keyring being added to. * @type: The type of key being added. * @payload: The payload of the key intended to be added. - * @data: Additional data for evaluating restriction. + * @restriction_key: Keys providing additional data for evaluating restriction. * * Reject the addition of any links to a keyring. It can be overridden by * passing KEY_ALLOC_BYPASS_RESTRICTION to key_instantiate_and_link() when @@ -976,9 +976,13 @@ static bool keyring_detect_restriction_cycle(const struct key *dest_keyring, /** * keyring_restrict - Look up and apply a restriction to a keyring - * - * @keyring: The keyring to be restricted + * @keyring_ref: The keyring to be restricted + * @type: The key type that will provide the restriction checker. * @restriction: The restriction options to apply to the keyring + * + * Look up a keyring and apply a restriction to it. The restriction is managed + * by the specific key type, but can be configured by the options specified in + * the restriction string. */ int keyring_restrict(key_ref_t keyring_ref, const char *type, const char *restriction) diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 75d87f9e0f49..1f234b019437 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -24,7 +24,7 @@ /** * complete_request_key - Complete the construction of a key. - * @auth_key: The authorisation key. + * @authkey: The authorisation key. * @error: The success or failute of the construction. * * Complete the attempt to construct a key. The key will be negated From patchwork Wed May 22 22:28:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956727 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 A2EC81395 for ; Wed, 22 May 2019 22:28:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B922E205C0 for ; Wed, 22 May 2019 22:28:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AB1A421F61; Wed, 22 May 2019 22:28:34 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 50ED0205C0 for ; Wed, 22 May 2019 22:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729381AbfEVW2d (ORCPT ); Wed, 22 May 2019 18:28:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33544 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726781AbfEVW2d (ORCPT ); Wed, 22 May 2019 18:28:33 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E362DC04B93D; Wed, 22 May 2019 22:28:32 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id 202BB1001DE0; Wed, 22 May 2019 22:28:31 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 4/7] keys: Break bits out of key_unlink() From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:31 +0100 Message-ID: <155856411142.10428.16280282329908085391.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Wed, 22 May 2019 22:28:32 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Break bits out of key_unlink() into helper functions so that they can be used in implementing key_move(). Signed-off-by: David Howells Reviewed-by: James Morris --- security/keys/keyring.c | 86 ++++++++++++++++++++++++++++++++++++----------- 1 file changed, 65 insertions(+), 21 deletions(-) diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 5b218b270598..2cfeeeaa1ffa 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -1382,6 +1382,65 @@ int key_link(struct key *keyring, struct key *key) } EXPORT_SYMBOL(key_link); +/* + * Begin the process of unlinking a key from a keyring. + */ +static int __key_unlink_begin(struct key *keyring, unsigned int lock_nesting, + struct key *key, struct assoc_array_edit **_edit) + __acquires(&keyring->sem) +{ + struct assoc_array_edit *edit; + int ret; + + if (keyring->type != &key_type_keyring) + return -ENOTDIR; + + down_write_nested(&keyring->sem, lock_nesting); + + edit = assoc_array_delete(&keyring->keys, &keyring_assoc_array_ops, + &key->index_key); + if (IS_ERR(edit)) { + ret = PTR_ERR(edit); + goto error; + } + + if (!edit) { + ret = -ENOENT; + goto error; + } + + *_edit = edit; + return 0; + +error: + up_write(&keyring->sem); + return ret; +} + +/* + * Apply an unlink change. + */ +static void __key_unlink(struct key *keyring, struct key *key, + struct assoc_array_edit **_edit) +{ + assoc_array_apply_edit(*_edit); + *_edit = NULL; + key_payload_reserve(keyring, keyring->datalen - KEYQUOTA_LINK_BYTES); +} + +/* + * Finish unlinking a key from to a keyring. + */ +static void __key_unlink_end(struct key *keyring, + struct key *key, + struct assoc_array_edit *edit) + __releases(&keyring->sem) +{ + if (edit) + assoc_array_cancel_edit(edit); + up_write(&keyring->sem); +} + /** * key_unlink - Unlink the first link to a key from a keyring. * @keyring: The keyring to remove the link from. @@ -1407,28 +1466,13 @@ int key_unlink(struct key *keyring, struct key *key) key_check(keyring); key_check(key); - if (keyring->type != &key_type_keyring) - return -ENOTDIR; - - down_write(&keyring->sem); - - edit = assoc_array_delete(&keyring->keys, &keyring_assoc_array_ops, - &key->index_key); - if (IS_ERR(edit)) { - ret = PTR_ERR(edit); - goto error; - } - ret = -ENOENT; - if (edit == NULL) - goto error; - - assoc_array_apply_edit(edit); - key_payload_reserve(keyring, keyring->datalen - KEYQUOTA_LINK_BYTES); - ret = 0; + ret = __key_unlink_begin(keyring, 0, key, &edit); + if (ret < 0) + return ret; -error: - up_write(&keyring->sem); - return ret; + __key_unlink(keyring, key, &edit); + __key_unlink_end(keyring, key, edit); + return 0; } EXPORT_SYMBOL(key_unlink); From patchwork Wed May 22 22:28:38 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956729 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 1089676 for ; Wed, 22 May 2019 22:28:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2525E1FFFE for ; Wed, 22 May 2019 22:28:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 17C25228C8; Wed, 22 May 2019 22:28:42 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 9EBF71FFFE for ; Wed, 22 May 2019 22:28:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729475AbfEVW2k (ORCPT ); Wed, 22 May 2019 18:28:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47890 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726781AbfEVW2k (ORCPT ); Wed, 22 May 2019 18:28:40 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CFBA430001D9; Wed, 22 May 2019 22:28:39 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id CF64C60BF1; Wed, 22 May 2019 22:28:38 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 5/7] keys: Make __key_link_begin() handle lockdep nesting From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:38 +0100 Message-ID: <155856411812.10428.4394700002321005951.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Wed, 22 May 2019 22:28:39 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Make __key_link_begin() handle lockdep nesting for the implementation of key_move() where we have to lock two keyrings. Signed-off-by: David Howells Reviewed-by: James Morris --- security/keys/internal.h | 2 +- security/keys/key.c | 6 +++--- security/keys/keyring.c | 6 +++--- security/keys/request_key.c | 2 +- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/security/keys/internal.h b/security/keys/internal.h index 8f533c81aa8d..93513667ff9a 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -93,7 +93,7 @@ extern wait_queue_head_t request_key_conswq; extern struct key_type *key_type_lookup(const char *type); extern void key_type_put(struct key_type *ktype); -extern int __key_link_begin(struct key *keyring, +extern int __key_link_begin(struct key *keyring, unsigned int lock_nesting, const struct keyring_index_key *index_key, struct assoc_array_edit **_edit); extern int __key_link_check_live_key(struct key *keyring, struct key *key); diff --git a/security/keys/key.c b/security/keys/key.c index 696f1c092c50..e0750bc85b68 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -515,7 +515,7 @@ int key_instantiate_and_link(struct key *key, } if (keyring) { - ret = __key_link_begin(keyring, &key->index_key, &edit); + ret = __key_link_begin(keyring, 0, &key->index_key, &edit); if (ret < 0) goto error; @@ -583,7 +583,7 @@ int key_reject_and_link(struct key *key, if (keyring->restrict_link) return -EPERM; - link_ret = __key_link_begin(keyring, &key->index_key, &edit); + link_ret = __key_link_begin(keyring, 0, &key->index_key, &edit); } mutex_lock(&key_construction_mutex); @@ -860,7 +860,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, } index_key.desc_len = strlen(index_key.description); - ret = __key_link_begin(keyring, &index_key, &edit); + ret = __key_link_begin(keyring, 0, &index_key, &edit); if (ret < 0) { key_ref = ERR_PTR(ret); goto error_free_prep; diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 2cfeeeaa1ffa..cd669f758632 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -1202,7 +1202,7 @@ static int keyring_detect_cycle(struct key *A, struct key *B) /* * Preallocate memory so that a key can be linked into to a keyring. */ -int __key_link_begin(struct key *keyring, +int __key_link_begin(struct key *keyring, unsigned int lock_nesting, const struct keyring_index_key *index_key, struct assoc_array_edit **_edit) __acquires(&keyring->sem) @@ -1219,7 +1219,7 @@ int __key_link_begin(struct key *keyring, if (keyring->type != &key_type_keyring) return -ENOTDIR; - down_write(&keyring->sem); + down_write_nested(&keyring->sem, lock_nesting); ret = -EKEYREVOKED; if (test_bit(KEY_FLAG_REVOKED, &keyring->flags)) @@ -1366,7 +1366,7 @@ int key_link(struct key *keyring, struct key *key) key_check(keyring); key_check(key); - ret = __key_link_begin(keyring, &key->index_key, &edit); + ret = __key_link_begin(keyring, 0, &key->index_key, &edit); if (ret == 0) { kdebug("begun {%d,%d}", keyring->serial, refcount_read(&keyring->usage)); ret = __key_link_check_restriction(keyring, key); diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 1f234b019437..e3653c6f85c6 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -372,7 +372,7 @@ static int construct_alloc_key(struct keyring_search_context *ctx, set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags); if (dest_keyring) { - ret = __key_link_begin(dest_keyring, &ctx->index_key, &edit); + ret = __key_link_begin(dest_keyring, 0, &ctx->index_key, &edit); if (ret < 0) goto link_prealloc_failed; } From patchwork Wed May 22 22:28:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956731 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 00D311395 for ; Wed, 22 May 2019 22:28:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 157EA1FFFE for ; Wed, 22 May 2019 22:28:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 095AF21F61; Wed, 22 May 2019 22:28:49 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 4989C1FFFE for ; Wed, 22 May 2019 22:28:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729576AbfEVW2r (ORCPT ); Wed, 22 May 2019 18:28:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47908 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726781AbfEVW2r (ORCPT ); Wed, 22 May 2019 18:28:47 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C89A63001757; Wed, 22 May 2019 22:28:46 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id C1ECD6063A; Wed, 22 May 2019 22:28:45 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 6/7] keys: Add a keyctl to move a key between keyrings From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:45 +0100 Message-ID: <155856412507.10428.15987388402707639951.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Wed, 22 May 2019 22:28:46 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Add a keyctl to atomically move a link to a key from one keyring to another. The key must exist in "from" keyring and a flag can be given to cause the operation to fail if there's a matching key already in the "to" keyring. This can be done with: keyctl(KEYCTL_MOVE, key_serial_t key, key_serial_t from_keyring, key_serial_t to_keyring, unsigned int flags); The key being moved must grant Link permission and both keyrings must grant Write permission. flags should be 0 or KEYCTL_MOVE_EXCL, with the latter preventing displacement of a matching key from the "to" keyring. Signed-off-by: David Howells --- include/linux/key.h | 5 ++ include/uapi/linux/keyctl.h | 3 + security/keys/compat.c | 3 + security/keys/internal.h | 1 security/keys/keyctl.c | 55 +++++++++++++++++++++++++++ security/keys/keyring.c | 88 +++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 155 insertions(+) diff --git a/include/linux/key.h b/include/linux/key.h index 1f09aad1c98c..612e1cf84049 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -310,6 +310,11 @@ extern int key_update(key_ref_t key, extern int key_link(struct key *keyring, struct key *key); +extern int key_move(struct key *key, + struct key *from_keyring, + struct key *to_keyring, + unsigned int flags); + extern int key_unlink(struct key *keyring, struct key *key); diff --git a/include/uapi/linux/keyctl.h b/include/uapi/linux/keyctl.h index f45ee0f69c0c..fd9fb11b312b 100644 --- a/include/uapi/linux/keyctl.h +++ b/include/uapi/linux/keyctl.h @@ -67,6 +67,7 @@ #define KEYCTL_PKEY_SIGN 27 /* Create a public key signature */ #define KEYCTL_PKEY_VERIFY 28 /* Verify a public key signature */ #define KEYCTL_RESTRICT_KEYRING 29 /* Restrict keys allowed to link to a keyring */ +#define KEYCTL_MOVE 30 /* Move keys between keyrings */ /* keyctl structures */ struct keyctl_dh_params { @@ -112,4 +113,6 @@ struct keyctl_pkey_params { __u32 __spare[7]; }; +#define KEYCTL_MOVE_EXCL 0x00000001 /* Do not displace from the to-keyring */ + #endif /* _LINUX_KEYCTL_H */ diff --git a/security/keys/compat.c b/security/keys/compat.c index 9482df601dc3..b326bc4f84d7 100644 --- a/security/keys/compat.c +++ b/security/keys/compat.c @@ -159,6 +159,9 @@ COMPAT_SYSCALL_DEFINE5(keyctl, u32, option, return keyctl_pkey_verify(compat_ptr(arg2), compat_ptr(arg3), compat_ptr(arg4), compat_ptr(arg5)); + case KEYCTL_MOVE: + return keyctl_keyring_move(arg2, arg3, arg4, arg5); + default: return -EOPNOTSUPP; } diff --git a/security/keys/internal.h b/security/keys/internal.h index 93513667ff9a..821819b4ee13 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -215,6 +215,7 @@ extern long keyctl_update_key(key_serial_t, const void __user *, size_t); extern long keyctl_revoke_key(key_serial_t); extern long keyctl_keyring_clear(key_serial_t); extern long keyctl_keyring_link(key_serial_t, key_serial_t); +extern long keyctl_keyring_move(key_serial_t, key_serial_t, key_serial_t, unsigned int); extern long keyctl_keyring_unlink(key_serial_t, key_serial_t); extern long keyctl_describe_key(key_serial_t, char __user *, size_t); extern long keyctl_keyring_search(key_serial_t, const char __user *, diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 0f947bcbad46..46188cda177e 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -572,6 +572,55 @@ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) return ret; } +/* + * Move a link to a key from one keyring to another, displacing any matching + * key from the destination keyring. + * + * The key must grant the caller Link permission and both keyrings must grant + * the caller Write permission. There must also be a link in the from keyring + * to the key. If both keyrings are the same, nothing is done. + * + * If successful, 0 will be returned. + */ +long keyctl_keyring_move(key_serial_t id, key_serial_t from_ringid, + key_serial_t to_ringid, unsigned int flags) +{ + key_ref_t key_ref, from_ref, to_ref; + long ret; + + if (flags & ~KEYCTL_MOVE_EXCL) + return -EINVAL; + + key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); + if (IS_ERR(key_ref)) { + ret = PTR_ERR(key_ref); + goto error; + } + + from_ref = lookup_user_key(from_ringid, 0, KEY_NEED_WRITE); + if (IS_ERR(from_ref)) { + ret = PTR_ERR(from_ref); + goto error2; + } + + to_ref = lookup_user_key(to_ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); + if (IS_ERR(to_ref)) { + ret = PTR_ERR(to_ref); + goto error3; + } + + ret = key_move(key_ref_to_ptr(key_ref), key_ref_to_ptr(from_ref), + key_ref_to_ptr(to_ref), flags); + + key_ref_put(to_ref); +error3: + key_ref_put(from_ref); +error2: + key_ref_put(key_ref); +error: + return ret; +} + /* * Return a description of a key to userspace. * @@ -1772,6 +1821,12 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, (const void __user *)arg4, (const void __user *)arg5); + case KEYCTL_MOVE: + return keyctl_keyring_move((key_serial_t)arg2, + (key_serial_t)arg3, + (key_serial_t)arg4, + (unsigned int)arg5); + default: return -EOPNOTSUPP; } diff --git a/security/keys/keyring.c b/security/keys/keyring.c index cd669f758632..df3144f9c1aa 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -1476,6 +1476,94 @@ int key_unlink(struct key *keyring, struct key *key) } EXPORT_SYMBOL(key_unlink); +/** + * key_move - Move a key from one keyring to another + * @key: The key to move + * @from_keyring: The keyring to remove the link from. + * @to_keyring: The keyring to make the link in. + * @flags: Qualifying flags, such as KEYCTL_MOVE_EXCL. + * + * Make a link in @to_keyring to a key, such that the keyring holds a reference + * on that key and the key can potentially be found by searching that keyring + * whilst simultaneously removing a link to the key from @from_keyring. + * + * This function will write-lock both keyring's semaphores and will consume + * some of the user's key data quota to hold the link on @to_keyring. + * + * Returns 0 if successful, -ENOTDIR if either keyring isn't a keyring, + * -EKEYREVOKED if either keyring has been revoked, -ENFILE if the second + * keyring is full, -EDQUOT if there is insufficient key data quota remaining + * to add another link or -ENOMEM if there's insufficient memory. If + * KEYCTL_MOVE_EXCL is set, then -EEXIST will be returned if there's already a + * matching key in @to_keyring. + * + * It is assumed that the caller has checked that it is permitted for a link to + * be made (the keyring should have Write permission and the key Link + * permission). + */ +int key_move(struct key *key, + struct key *from_keyring, + struct key *to_keyring, + unsigned int flags) +{ + struct assoc_array_edit *from_edit, *to_edit; + int ret; + + kenter("%d,%d,%d", key->serial, from_keyring->serial, to_keyring->serial); + + if (from_keyring == to_keyring) + return 0; + + key_check(key); + key_check(from_keyring); + key_check(to_keyring); + + /* We have to be very careful here to take the keyring locks in the + * right order, lest we open ourselves to deadlocking against another + * move operation. + */ + if (from_keyring < to_keyring) { + ret = __key_unlink_begin(from_keyring, 0, key, &from_edit); + if (ret < 0) + goto out; + ret = __key_link_begin(to_keyring, 1, &key->index_key, &to_edit); + if (ret < 0) { + assoc_array_cancel_edit(from_edit); + goto out; + } + } else { + ret = __key_link_begin(to_keyring, 0, &key->index_key, &to_edit); + if (ret < 0) + goto out; + ret = __key_unlink_begin(from_keyring, 1, key, &from_edit); + if (ret < 0) { + __key_link_end(to_keyring, &key->index_key, to_edit); + goto out; + } + } + + ret = -EEXIST; + if (to_edit->dead_leaf && (flags & KEYCTL_MOVE_EXCL)) + goto error; + + ret = __key_link_check_restriction(to_keyring, key); + if (ret < 0) + goto error; + ret = __key_link_check_live_key(to_keyring, key); + if (ret < 0) + goto error; + + __key_unlink(from_keyring, key, &from_edit); + __key_link(key, &to_edit); +error: + __key_unlink_end(from_keyring, key, from_edit); + __key_link_end(to_keyring, &key->index_key, to_edit); +out: + kleave(" = %d", ret); + return ret; +} +EXPORT_SYMBOL(key_move); + /** * keyring_clear - Clear a keyring * @keyring: The keyring to clear. From patchwork Wed May 22 22:28:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 10956733 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 EB3F81395 for ; Wed, 22 May 2019 22:28:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0C7B31FFFE for ; Wed, 22 May 2019 22:28:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0105621F61; Wed, 22 May 2019 22:28:57 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 A71081FFFE for ; Wed, 22 May 2019 22:28:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729640AbfEVW25 (ORCPT ); Wed, 22 May 2019 18:28:57 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56602 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726781AbfEVW24 (ORCPT ); Wed, 22 May 2019 18:28:56 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id AC3643179155; Wed, 22 May 2019 22:28:56 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-142.rdu2.redhat.com [10.10.121.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id D1A4519C4F; Wed, 22 May 2019 22:28:55 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 7/7] keys: Grant Link permission to possessers of request_key auth keys From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:52 +0100 Message-ID: <155856413201.10428.13385006340817641517.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Wed, 22 May 2019 22:28:56 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Grant Link permission to the possessers of request_key authentication keys, thereby allowing a daemon that is servicing upcalls to arrange things such that only the necessary auth key is passed to the actual service program and not all the daemon's pending auth keys. Signed-off-by: David Howells Reviewed-by: James Morris --- security/keys/request_key_auth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c index 572c7a60473a..ec5226557023 100644 --- a/security/keys/request_key_auth.c +++ b/security/keys/request_key_auth.c @@ -204,7 +204,7 @@ struct key *request_key_auth_new(struct key *target, const char *op, authkey = key_alloc(&key_type_request_key_auth, desc, cred->fsuid, cred->fsgid, cred, - KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH | + KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH | KEY_POS_LINK | KEY_USR_VIEW, KEY_ALLOC_NOT_IN_QUOTA, NULL); if (IS_ERR(authkey)) { ret = PTR_ERR(authkey);