Received: by 2002:a25:e7d8:0:0:0:0:0 with SMTP id e207csp1119073ybh; Sat, 14 Mar 2020 18:33:45 -0700 (PDT) X-Google-Smtp-Source: ADFU+vs3DIZOgvZ/6bnQoC7wBiDc+Z9QYAckEih7e+E46xCFTMxEXTsxXEYy0BVgxZ2p/isBEQn4 X-Received: by 2002:aca:d553:: with SMTP id m80mr12815736oig.30.1584236025170; Sat, 14 Mar 2020 18:33:45 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1584236025; cv=pass; d=google.com; s=arc-20160816; b=1JqswuqV4nFG+ce1tr88g3tOW0bfTUr3ZLV9fKYihjRymZbQE1m7ARZaCU3YvIkjP2 eO0W+cV9uF/oYq93vW9RWXXHPyR5XwBpQ+Lcp9rDHZH1W3TkzDVJtn9Yj0Z6JDDWrFSn FhFs3FkiHTWbUl3A/VnCE4eueZ7a/RZJopVRwqoXEDZUeiAOXgAGxRsXgRY3itZESCyt MrX8VRhXO8aAz7vt0HhoHe1V3l9htHm10eOTNETzg/jBxr56JIOrb/cFe2rEDwlPlfvo W98meFfPDyFcNbik3xLujYCp6HnCVqr2vBaxcahEmw54k6gq8qWSbBkNA+aNYbWI6h31 Cqfw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:content-transfer-encoding :content-language:in-reply-to:user-agent:date:message-id:references :cc:to:subject:from; bh=aQWV7K6+3M3gN5MtM5XTBxzVRYuEhMrr29I0KpA+cQc=; b=HisoMHmv2smlu6Xbt8uSJU5Vfr6H+EwKdp3feFpr4hmbQuHC9L0PZiGbusIpHJRhb6 QPj9UutOIsEe0i+qxVHkRBMEVuQf13+6c13JDG+m76LMPlQ6H8tvQled9Oe+kJSn9jh4 xWmaF0s8bsJoM+yK887Sr95CtFnBIiylRQMwjtC5OzyP6x0RIgwlk7FRn39B2FzFuyxW D/hml9vRvd2FWDRP5Si3yWvDVuNjpJt0NMANiNXx91wYDPGMKQZ3jdFBrMbIYNGJzQmq 6dNS2LiSUfnJF5cGL3UVH0O4Xyt4HYgGD3th5fsFqki4RC/lqkItp5baNsHMA+xA8CPE 80xA== ARC-Authentication-Results: i=2; mx.google.com; arc=pass (i=1 spf=pass spfdomain=hotmail.de dkim=pass dkdomain=hotmail.de dmarc=pass fromdomain=hotmail.de); spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id r17si6124777otq.138.2020.03.14.18.33.33; Sat, 14 Mar 2020 18:33:45 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; arc=pass (i=1 spf=pass spfdomain=hotmail.de dkim=pass dkdomain=hotmail.de dmarc=pass fromdomain=hotmail.de); spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727082AbgCOBaF (ORCPT + 99 others); Sat, 14 Mar 2020 21:30:05 -0400 Received: from mail-oln040092065028.outbound.protection.outlook.com ([40.92.65.28]:1938 "EHLO EUR01-HE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727050AbgCOBaD (ORCPT ); Sat, 14 Mar 2020 21:30:03 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=S8wzEONNYj+i5nqJILtLMFdIgk2xsR5diUdyl0j/llF+I8oV2ahSZI0Ueuw8cnjjJ9oUqXlmS8OvVgmRlbZ6wMpgbS+ZwMDIYPMQzCs7EIQQ58h6usm+QAN3X8erFZu81gduBNuPgeW9PRbgWI49On8egQGEHzoQU3l0cys5mcK23PlyJu7MCIPROsIqt/6hJa5MS0Lk3scfexokk9A60cbKlogNOJdBoUgdcXDmLuFLKV8UpCdQ0NP7XKwS9hUf0aDPKxKySiX7q40UjK8M6yLmB8t6oOAch6/l/hTqOoMD21pCAUk0IgUaPVO1SnvMlqEIJU5OInnBqtEQDa0LQQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=aQWV7K6+3M3gN5MtM5XTBxzVRYuEhMrr29I0KpA+cQc=; b=GX1zI0RnAivSA2w3pwN3+tIkKo2SwuA7tOeOPZ5ZarY9ekuJTXAq6xv/mskC7viH2i1UOPYzqHPb7+sJR3mzRWeVy+znETIfNLhPwNtXYUUCI1jvw81iN8EqXYuAjHxYvocpFeSll+fYhIo7gX8fFryvCwKdBYjmBfYSFYKC86L/PSO4/G+LXLGYejVgnF/HSpGebT9dlkWZCro6ulCqtyU0CHo/xuRV/ipVfcKDLv1npqG2K+ZfQ0Y71czXohElk2rmsQojqK/UafDxk+qLvD8gD0Ieto32//xs4xPHp+aoX3AUxibloTXbB9Coyr3g53uSLtICAk5DE7RoDN4hNw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=hotmail.de; dmarc=pass action=none header.from=hotmail.de; dkim=pass header.d=hotmail.de; arc=none Received: from HE1EUR01FT018.eop-EUR01.prod.protection.outlook.com (2a01:111:e400:7e18::36) by HE1EUR01HT229.eop-EUR01.prod.protection.outlook.com (2a01:111:e400:7e18::471) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2814.14; Sat, 14 Mar 2020 09:13:02 +0000 Received: from AM6PR03MB5170.eurprd03.prod.outlook.com (10.152.0.51) by HE1EUR01FT018.mail.protection.outlook.com (10.152.0.175) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2814.14 via Frontend Transport; Sat, 14 Mar 2020 09:13:02 +0000 X-IncomingTopHeaderMarker: OriginalChecksum:9874A653B683B2AE6740553C9DB31FD712F44B3CFF756D21E387F885308AEACA;UpperCasedChecksum:B3C560AACEDBF426AB4419F5DD0A0DE9D70C901630FD74FF017195B54C0223B2;SizeAsReceived:10353;Count:50 Received: from AM6PR03MB5170.eurprd03.prod.outlook.com ([fe80::1956:d274:cab3:b4dd]) by AM6PR03MB5170.eurprd03.prod.outlook.com ([fe80::1956:d274:cab3:b4dd%6]) with mapi id 15.20.2814.018; Sat, 14 Mar 2020 09:13:02 +0000 From: Bernd Edlinger Subject: [PATCH 1/2] exec: Fix dead-lock in de_thread with ptrace_attach To: Kirill Tkhai , "Eric W. Biederman" Cc: Christian Brauner , Kees Cook , Jann Horn , Jonathan Corbet , Alexander Viro , Andrew Morton , Alexey Dobriyan , Thomas Gleixner , Oleg Nesterov , Frederic Weisbecker , Andrei Vagin , Ingo Molnar , "Peter Zijlstra (Intel)" , Yuyang Du , David Hildenbrand , Sebastian Andrzej Siewior , Anshuman Khandual , David Howells , James Morris , Greg Kroah-Hartman , Shakeel Butt , Jason Gunthorpe , Christian Kellner , Andrea Arcangeli , Aleksa Sarai , "Dmitry V. Levin" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "stable@vger.kernel.org" , "linux-api@vger.kernel.org" References: <87v9nlii0b.fsf@x220.int.ebiederm.org> <87a74xi4kz.fsf@x220.int.ebiederm.org> <87r1y8dqqz.fsf@x220.int.ebiederm.org> <87tv32cxmf.fsf_-_@x220.int.ebiederm.org> <87v9ne5y4y.fsf_-_@x220.int.ebiederm.org> <87zhcq4jdj.fsf_-_@x220.int.ebiederm.org> <87d09hn4kt.fsf@x220.int.ebiederm.org> <87lfo5lju6.fsf@x220.int.ebiederm.org> <6002ac56-025a-d50f-e89d-1bf42a072323@virtuozzo.com> Message-ID: Date: Sat, 14 Mar 2020 10:12:59 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 In-Reply-To: <6002ac56-025a-d50f-e89d-1bf42a072323@virtuozzo.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: ZR0P278CA0015.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:16::25) To AM6PR03MB5170.eurprd03.prod.outlook.com (2603:10a6:20b:ca::23) X-Microsoft-Original-Message-ID: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.101] (92.77.140.102) by ZR0P278CA0015.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:16::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2814.13 via Frontend Transport; Sat, 14 Mar 2020 09:13:00 +0000 X-Microsoft-Original-Message-ID: X-TMN: [JV5Rp9V8izNxMMC4Xu4j7QTWfk9lx0hD] X-MS-PublicTrafficType: Email X-IncomingHeaderCount: 50 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-Correlation-Id: b89af16d-a0a9-4ef3-e317-08d7c7f7e598 X-MS-TrafficTypeDiagnostic: HE1EUR01HT229: X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: YZ5EDCtWGGspf2dUHOBsy8Uxo0I+LTFzMQ+CCFsNGh4TkWybo2phWOrg1Vs4yi7VbPPIOf89HVekrMI6r5DFnqAbmjViQnXyi8maz2FPB0KAw1w8aJjQ7SJn1mZ0FgZM6/bVCEmc4meGDZ67PvxIW4/i72bT6ew2VwFF8bAXEAZ9rr+WVFMsQNj2kQsGo8+W X-MS-Exchange-AntiSpam-MessageData: 3Mlawo9jDqkiQ24bBGf88oK04cHc1ZXx4wadlzrdt+7yY+F+5dDUde7RLmsuG1QXQVNjPwIInujEi9HjtOhVld+bHznSlKaDPY3wqR/z3Owm4q/tLQRy/BEMfLIm1BiZYnLqDWmSY9HNEwQlUW2lrA== X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b89af16d-a0a9-4ef3-e317-08d7c7f7e598 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Mar 2020 09:13:02.2953 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1EUR01HT229 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This removes the last users of cred_guard_mutex and replaces it with a new mutex exec_guard_mutex, and a boolean unsafe_execve_in_progress. This addresses the case when at least one of the sibling threads is traced, and therefore the trace process may dead-lock in ptrace_attach, but de_thread will need to wait for the tracer to continue execution. The solution is to detect this situation and make ptrace_attach and similar functions return -EAGAIN, but only in a situation where a dead-lock is imminent. This means this is an API change, but only when the process is traced while execve happens in a multi-threaded application. See tools/testing/selftests/ptrace/vmaccess.c for a test case that gets fixed by this change. Signed-off-by: Bernd Edlinger --- fs/exec.c | 44 +++++++++++++++++++++++++++++++++++--------- fs/proc/base.c | 13 ++++++++----- include/linux/sched/signal.h | 14 +++++++++----- init/init_task.c | 2 +- kernel/cred.c | 2 +- kernel/fork.c | 2 +- kernel/ptrace.c | 20 +++++++++++++++++--- kernel/seccomp.c | 15 +++++++++------ 8 files changed, 81 insertions(+), 31 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index 11974a1..6b78518 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1073,14 +1073,26 @@ static int de_thread(struct task_struct *tsk) struct signal_struct *sig = tsk->signal; struct sighand_struct *oldsighand = tsk->sighand; spinlock_t *lock = &oldsighand->siglock; + struct task_struct *t = tsk; if (thread_group_empty(tsk)) goto no_thread_group; + spin_lock_irq(lock); + while_each_thread(tsk, t) { + if (unlikely(t->ptrace)) + sig->unsafe_execve_in_progress = true; + } + + if (unlikely(sig->unsafe_execve_in_progress)) { + spin_unlock_irq(lock); + mutex_unlock(&sig->exec_guard_mutex); + spin_lock_irq(lock); + } + /* * Kill all other threads in the thread group. */ - spin_lock_irq(lock); if (signal_group_exit(sig)) { /* * Another group action in progress, just @@ -1424,22 +1436,30 @@ void finalize_exec(struct linux_binprm *bprm) EXPORT_SYMBOL(finalize_exec); /* - * Prepare credentials and lock ->cred_guard_mutex. + * Prepare credentials and lock ->exec_guard_mutex. * install_exec_creds() commits the new creds and drops the lock. * Or, if exec fails before, free_bprm() should release ->cred and * and unlock. */ static int prepare_bprm_creds(struct linux_binprm *bprm) { - if (mutex_lock_interruptible(¤t->signal->cred_guard_mutex)) + int ret; + + if (mutex_lock_interruptible(¤t->signal->exec_guard_mutex)) return -ERESTARTNOINTR; + ret = -EAGAIN; + if (unlikely(current->signal->unsafe_execve_in_progress)) + goto out; + bprm->cred = prepare_exec_creds(); if (likely(bprm->cred)) return 0; - mutex_unlock(¤t->signal->cred_guard_mutex); - return -ENOMEM; + ret = -ENOMEM; +out: + mutex_unlock(¤t->signal->exec_guard_mutex); + return ret; } static void free_bprm(struct linux_binprm *bprm) @@ -1448,7 +1468,10 @@ static void free_bprm(struct linux_binprm *bprm) if (bprm->cred) { if (bprm->called_exec_mmap) mutex_unlock(¤t->signal->exec_update_mutex); - mutex_unlock(¤t->signal->cred_guard_mutex); + if (unlikely(current->signal->unsafe_execve_in_progress)) + mutex_lock(¤t->signal->exec_guard_mutex); + current->signal->unsafe_execve_in_progress = false; + mutex_unlock(¤t->signal->exec_guard_mutex); abort_creds(bprm->cred); } if (bprm->file) { @@ -1492,19 +1515,22 @@ void install_exec_creds(struct linux_binprm *bprm) if (get_dumpable(current->mm) != SUID_DUMP_USER) perf_event_exit_task(current); /* - * cred_guard_mutex must be held at least to this point to prevent + * exec_guard_mutex must be held at least to this point to prevent * ptrace_attach() from altering our determination of the task's * credentials; any time after this it may be unlocked. */ security_bprm_committed_creds(bprm); mutex_unlock(¤t->signal->exec_update_mutex); - mutex_unlock(¤t->signal->cred_guard_mutex); + if (unlikely(current->signal->unsafe_execve_in_progress)) + mutex_lock(¤t->signal->exec_guard_mutex); + current->signal->unsafe_execve_in_progress = false; + mutex_unlock(¤t->signal->exec_guard_mutex); } EXPORT_SYMBOL(install_exec_creds); /* * determine how safe it is to execute the proposed program - * - the caller must hold ->cred_guard_mutex to protect against + * - the caller must hold ->exec_guard_mutex to protect against * PTRACE_ATTACH or seccomp thread-sync */ static void check_unsafe_exec(struct linux_binprm *bprm) diff --git a/fs/proc/base.c b/fs/proc/base.c index 6b13fc4..a428536 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2680,14 +2680,17 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, } /* Guard against adverse ptrace interaction */ - rv = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); + rv = mutex_lock_interruptible(¤t->signal->exec_guard_mutex); if (rv < 0) goto out_free; - rv = security_setprocattr(PROC_I(inode)->op.lsm, - file->f_path.dentry->d_name.name, page, - count); - mutex_unlock(¤t->signal->cred_guard_mutex); + if (unlikely(current->signal->unsafe_execve_in_progress)) + rv = -EAGAIN; + else + rv = security_setprocattr(PROC_I(inode)->op.lsm, + file->f_path.dentry->d_name.name, + page, count); + mutex_unlock(¤t->signal->exec_guard_mutex); out_free: kfree(page); out: diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index a29df79..e83cef2 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -212,6 +212,13 @@ struct signal_struct { #endif /* + * Set while execve is executing but is *not* holding + * exec_guard_mutex to avoid possible dead-locks. + * Only valid when exec_guard_mutex is held. + */ + bool unsafe_execve_in_progress; + + /* * Thread is the potential origin of an oom condition; kill first on * oom */ @@ -222,11 +229,8 @@ struct signal_struct { struct mm_struct *oom_mm; /* recorded mm when the thread group got * killed by the oom killer */ - struct mutex cred_guard_mutex; /* guard against foreign influences on - * credential calculations - * (notably. ptrace) - * Deprecated do not use in new code. - * Use exec_update_mutex instead. + struct mutex exec_guard_mutex; /* Held while execve runs, except when + * a sibling thread is being traced. */ struct mutex exec_update_mutex; /* Held while task_struct is being * updated during exec, and may have diff --git a/init/init_task.c b/init/init_task.c index bd403ed..6f96327 100644 --- a/init/init_task.c +++ b/init/init_task.c @@ -25,7 +25,7 @@ }, .multiprocess = HLIST_HEAD_INIT, .rlim = INIT_RLIMITS, - .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex), + .exec_guard_mutex = __MUTEX_INITIALIZER(init_signals.exec_guard_mutex), .exec_update_mutex = __MUTEX_INITIALIZER(init_signals.exec_update_mutex), #ifdef CONFIG_POSIX_TIMERS .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers), diff --git a/kernel/cred.c b/kernel/cred.c index 71a7926..341ca59 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -295,7 +295,7 @@ struct cred *prepare_creds(void) /* * Prepare credentials for current to perform an execve() - * - The caller must hold ->cred_guard_mutex + * - The caller must hold ->exec_guard_mutex */ struct cred *prepare_exec_creds(void) { diff --git a/kernel/fork.c b/kernel/fork.c index e23ccac..98012f7 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1593,7 +1593,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) sig->oom_score_adj = current->signal->oom_score_adj; sig->oom_score_adj_min = current->signal->oom_score_adj_min; - mutex_init(&sig->cred_guard_mutex); + mutex_init(&sig->exec_guard_mutex); mutex_init(&sig->exec_update_mutex); return 0; diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 43d6179..221759e 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -392,9 +392,13 @@ static int ptrace_attach(struct task_struct *task, long request, * under ptrace. */ retval = -ERESTARTNOINTR; - if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) + if (mutex_lock_interruptible(&task->signal->exec_guard_mutex)) goto out; + retval = -EAGAIN; + if (unlikely(task->signal->unsafe_execve_in_progress)) + goto unlock_creds; + task_lock(task); retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS); task_unlock(task); @@ -447,7 +451,7 @@ static int ptrace_attach(struct task_struct *task, long request, unlock_tasklist: write_unlock_irq(&tasklist_lock); unlock_creds: - mutex_unlock(&task->signal->cred_guard_mutex); + mutex_unlock(&task->signal->exec_guard_mutex); out: if (!retval) { /* @@ -472,10 +476,18 @@ static int ptrace_attach(struct task_struct *task, long request, */ static int ptrace_traceme(void) { - int ret = -EPERM; + int ret; + + if (mutex_lock_interruptible(¤t->signal->exec_guard_mutex)) + return -ERESTARTNOINTR; + + ret = -EAGAIN; + if (unlikely(current->signal->unsafe_execve_in_progress)) + goto unlock_creds; write_lock_irq(&tasklist_lock); /* Are we already being traced? */ + ret = -EPERM; if (!current->ptrace) { ret = security_ptrace_traceme(current->parent); /* @@ -490,6 +502,8 @@ static int ptrace_traceme(void) } write_unlock_irq(&tasklist_lock); +unlock_creds: + mutex_unlock(¤t->signal->exec_guard_mutex); return ret; } diff --git a/kernel/seccomp.c b/kernel/seccomp.c index b6ea3dc..acd6960 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -329,7 +329,7 @@ static int is_ancestor(struct seccomp_filter *parent, /** * seccomp_can_sync_threads: checks if all threads can be synchronized * - * Expects sighand and cred_guard_mutex locks to be held. + * Expects sighand and exec_guard_mutex locks to be held. * * Returns 0 on success, -ve on error, or the pid of a thread which was * either not in the correct seccomp mode or did not have an ancestral @@ -339,9 +339,12 @@ static inline pid_t seccomp_can_sync_threads(void) { struct task_struct *thread, *caller; - BUG_ON(!mutex_is_locked(¤t->signal->cred_guard_mutex)); + BUG_ON(!mutex_is_locked(¤t->signal->exec_guard_mutex)); assert_spin_locked(¤t->sighand->siglock); + if (unlikely(current->signal->unsafe_execve_in_progress)) + return -EAGAIN; + /* Validate all threads being eligible for synchronization. */ caller = current; for_each_thread(caller, thread) { @@ -371,7 +374,7 @@ static inline pid_t seccomp_can_sync_threads(void) /** * seccomp_sync_threads: sets all threads to use current's filter * - * Expects sighand and cred_guard_mutex locks to be held, and for + * Expects sighand and exec_guard_mutex locks to be held, and for * seccomp_can_sync_threads() to have returned success already * without dropping the locks. * @@ -380,7 +383,7 @@ static inline void seccomp_sync_threads(unsigned long flags) { struct task_struct *thread, *caller; - BUG_ON(!mutex_is_locked(¤t->signal->cred_guard_mutex)); + BUG_ON(!mutex_is_locked(¤t->signal->exec_guard_mutex)); assert_spin_locked(¤t->sighand->siglock); /* Synchronize all threads. */ @@ -1319,7 +1322,7 @@ static long seccomp_set_mode_filter(unsigned int flags, * while another thread is in the middle of calling exec. */ if (flags & SECCOMP_FILTER_FLAG_TSYNC && - mutex_lock_killable(¤t->signal->cred_guard_mutex)) + mutex_lock_killable(¤t->signal->exec_guard_mutex)) goto out_put_fd; spin_lock_irq(¤t->sighand->siglock); @@ -1337,7 +1340,7 @@ static long seccomp_set_mode_filter(unsigned int flags, out: spin_unlock_irq(¤t->sighand->siglock); if (flags & SECCOMP_FILTER_FLAG_TSYNC) - mutex_unlock(¤t->signal->cred_guard_mutex); + mutex_unlock(¤t->signal->exec_guard_mutex); out_put_fd: if (flags & SECCOMP_FILTER_FLAG_NEW_LISTENER) { if (ret) { -- 1.9.1