linux-kernel - [PATCH 0/4] Use new infrastructure to fix deadlocks in execve

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Message-ID: <AM6PR03MB51701C6F60699F99C5C67E0BE4FF0@AM6PR03MB5170.eurprd03.prod.outlook.com>
Date:   Tue, 10 Mar 2020 14:43:21 +0100
From:   Bernd Edlinger <bernd.edlinger@...mail.de>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Yuyang Du <duyuyang@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian Kellner <christian@...lner.me>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: [PATCH 0/4] Use new infrastructure to fix deadlocks in execve

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

-- 
1.9.1