linux-kernel - [PATCH 0/8] signal: Cleanup of the signal->flags

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Date:   Mon, 13 Dec 2021 16:50:56 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     <linux-kernel@...r.kernel.org>
Cc:     <linux-arch@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexey Gladkov <legion@...nel.org>,
        Kyle Huey <me@...ehuey.com>, Oleg Nesterov <oleg@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...IV.linux.org.uk>, <linux-api@...r.kernel.org>
Subject: [PATCH 0/8] signal: Cleanup of the signal->flags


The special case of SIGKILL during coredumps is very fragile today and
while reading through the code I realized I have almost broken it twice.
So this simplifies that special case, removes SIGNAL_GROUP_COREDUMP
which has become unnecessary with the addition of signal->core_state,
and this removes the helper signal_group_exit which is misnamed and
is not used properly.

If you squint very hard there might be a user space visible difference
in behavior somewhere but I don't think there is one in practice.

These patches are on top of:
https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git/ signal-for-v5.17

After these patches have been reviewed it is my plan to apply them to my
signal-for-v5.17 branch.

Eric W. Biederman (8):
      signal: Make SIGKILL during coredumps an explicit special case
      signal: Drop signals received after a fatal signal has been processed
      signal: Have the oom killer detect coredumps using signal->core_state
      signal: During coredumps set SIGNAL_GROUP_EXIT in zap_process
      signal: Remove SIGNAL_GROUP_COREDUMP
      coredump: Stop setting signal->group_exit_task
      signal: Rename group_exit_task group_exec_task
      signal: Remove the helper signal_group_exit

 fs/coredump.c                | 20 +++++++++-----------
 fs/exec.c                    | 10 +++++-----
 include/linux/sched/signal.h | 18 +++---------------
 kernel/exit.c                | 12 ++++++++----
 kernel/signal.c              | 24 ++++++++++++++++--------
 mm/oom_kill.c                |  2 +-
 6 files changed, 42 insertions(+), 44 deletions(-)

Eric