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From:   ebiederm@xmission.com (Eric W. Biederman)
To:     Bernd Edlinger <bernd.edlinger@hotmail.de>
Cc:     Christian Brauner <christian.brauner@ubuntu.com>,
        Kees Cook <keescook@chromium.org>,
        Jann Horn <jannh@google.com>, Jonathan Corbet <corbet@lwn.net>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Oleg Nesterov <oleg@redhat.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Andrei Vagin <avagin@gmail.com>,
        Ingo Molnar <mingo@kernel.org>,
        "Peter Zijlstra \(Intel\)" <peterz@infradead.org>,
        Yuyang Du <duyuyang@gmail.com>,
        David Hildenbrand <david@redhat.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        David Howells <dhowells@redhat.com>,
        James Morris <jamorris@linux.microsoft.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Shakeel Butt <shakeelb@google.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Christian Kellner <christian@kellner.me>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Aleksa Sarai <cyphar@cyphar.com>,
        "Dmitry V. Levin" <ldv@altlinux.org>,
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        "stable\@vger.kernel.org" <stable@vger.kernel.org>,
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Date:   Tue, 10 Mar 2020 10:35:41 -0500
In-Reply-To: <AM6PR03MB51701C6F60699F99C5C67E0BE4FF0@AM6PR03MB5170.eurprd03.prod.outlook.com>
        (Bernd Edlinger's message of "Tue, 10 Mar 2020 14:43:21 +0100")
Message-ID: <875zfcxlwy.fsf@x220.int.ebiederm.org>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Subject: Re: [PATCH 0/4] Use new infrastructure to fix deadlocks in execve
Sender: linux-kernel-owner@vger.kernel.org
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Bernd Edlinger <bernd.edlinger@hotmail.de> writes:

> This is a follow up on Eric's patch series to
> fix the deadlocks observed with ptracing when execve
> in multi-threaded applications.
>
> This fixes the simple and most important case where
> the cred_guard_mutex causes strace to deadlock.
>
> This also adds a test case (which is only partially
> fixed so far, the rest of the fixes will follow
> soon).
>
> Two trivial comment fixes are also included.
>
> Bernd Edlinger (4):
>   exec: Fix a deadlock in ptrace
>   selftests/ptrace: add test cases for dead-locks
>   mm: docs: Fix a comment in process_vm_rw_core
>   kernel: doc: remove outdated comment in prepare_kernel_cred
>
>  kernel/cred.c                             |  2 -
>  kernel/fork.c                             |  4 +-
>  mm/process_vm_access.c                    |  2 +-
>  tools/testing/selftests/ptrace/Makefile   |  4 +-
>  tools/testing/selftests/ptrace/vmaccess.c | 86 +++++++++++++++++++++++++++++++
>  5 files changed, 91 insertions(+), 7 deletions(-)
>  create mode 100644 tools/testing/selftests/ptrace/vmaccess.c

Applied.

Thank you,
Eric