[PATCHv2 0/1] prctl: move pdeath_signal from task_struct to signal_struct

[Filipe Brandenburger <filbranden@gmail.com>]

Hello,

This is a second version of the patch that I previously submitted under
title "prctl: pdeath_signal sent when parent thread (instead of parent
process) dies". As per the discussion on the original patch, I reworked
it to move pdeath_signal to signal_struct and make it truly per-process.

On Bugzilla #43300, there is some extra discussion and three test cases
including a transcript of their output running on the unpatched kernel
and on the patched kernel. The three test cases check three corner cases
where the current per-task pdeath_signal shows some behavior that is
counter intuitive and goes against what is in the documentation (the
prctl(2) manpage states that PR_SET_PDEATHSIG sets "the parent process
death signal of the calling process" which makes it clear that it is
supposed to be per-process.)

A link to the Bugzilla report:
https://bugzilla.kernel.org/show_bug.cgi?id=43300

Thanks,
Filipe


Filipe Brandenburger (1):
  prctl: move pdeath_signal from task_struct to signal_struct

 fs/exec.c                  |    2 +-
 include/linux/sched.h      |    7 ++++++-
 kernel/cred.c              |    2 +-
 kernel/exit.c              |    8 +++++---
 kernel/fork.c              |    1 -
 kernel/sys.c               |    5 +++--
 security/apparmor/domain.c |    2 +-
 security/selinux/hooks.c   |    2 +-
 security/smack/smack_lsm.c |    2 +-
 9 files changed, 19 insertions(+), 12 deletions(-)

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1.7.7.6