linux-kernel - [PATCH v6 00/16] Infrastructure to allow fixing exec deadlocks

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Date:   Fri, 20 Mar 2020 21:24:03 +0100
From:   Bernd Edlinger <bernd.edlinger@...mail.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        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>,
        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 v6 00/16] Infrastructure to allow fixing exec deadlocks

This is an infrastructure change that makes way for fixing this issue.
Each patch was already posted previously so this is just a cleanup of
the original mailing list thread(s) which got out of control by now.

Everything started here:
https://lore.kernel.org/lkml/AM6PR03MB5170B06F3A2B75EFB98D071AE4E60@AM6PR03MB5170.eurprd03.prod.outlook.com/

I added reviewed-by tags from the mailing list threads, except when
withdrawn.

It took a lot longer than expected to collect everything from the
mailinglist threads, since several commit messages have been infected
with typos, and they got fixed without a new patch version.

- Correct the point of no return.
- Add two new mutexes to replace cred_guard_mutex.
- Fix each use of cred_guard_mutex.
- Update documentation.
- Add a test case.

Bernd Edlinger (11):
  exec: Fix a deadlock in strace
  selftests/ptrace: add test cases for dead-locks
  mm: docs: Fix a comment in process_vm_rw_core
  kernel: doc: remove outdated comment cred.c
  kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve
  proc: Use new infrastructure to fix deadlocks in execve
  proc: io_accounting: Use new infrastructure to fix deadlocks in execve
  perf: Use new infrastructure to fix deadlocks in execve
  pidfd: Use new infrastructure to fix deadlocks in execve
  exec: Fix dead-lock in de_thread with ptrace_attach
  doc: Update documentation of ->exec_*_mutex

Eric W. Biederman (5):
  exec: Only compute current once in flush_old_exec
  exec: Factor unshare_sighand out of de_thread and call it separately
  exec: Move cleanup of posix timers on exec out of de_thread
  exec: Move exec_mmap right after de_thread in flush_old_exec
  exec: Add exec_update_mutex to replace cred_guard_mutex

 Documentation/security/credentials.rst    |  29 +++++--
 fs/exec.c                                 | 122 ++++++++++++++++++++++--------
 fs/proc/base.c                            |  23 +++---
 include/linux/binfmts.h                   |   8 +-
 include/linux/sched/signal.h              |  17 ++++-
 init/init_task.c                          |   3 +-
 kernel/cred.c                             |   4 +-
 kernel/events/core.c                      |  12 +--
 kernel/fork.c                             |   7 +-
 kernel/kcmp.c                             |   8 +-
 kernel/pid.c                              |   4 +-
 kernel/ptrace.c                           |  20 ++++-
 kernel/seccomp.c                          |  15 ++--
 mm/process_vm_access.c                    |   2 +-
 tools/testing/selftests/ptrace/Makefile   |   4 +-
 tools/testing/selftests/ptrace/vmaccess.c |  86 +++++++++++++++++++++
 16 files changed, 278 insertions(+), 86 deletions(-)
 create mode 100644 tools/testing/selftests/ptrace/vmaccess.c

-- 
1.9.1