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

Eric W. Biederman
2021-12-13T22:51:08Z

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