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| author | Oleg Nesterov <oleg@redhat.com> | 2015-11-06 16:32:31 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 17:50:42 -0800 |
| commit | 5fa534c987784c4811757a34c425aff3ce3b5037 (patch) | |
| tree | 09aa19be1afc7e10913f29758055c2056d5d3695 /kernel/signal.c | |
| parent | 9317bb9696566e6759203ffcaa80481b725785b3 (diff) | |
| download | op-kernel-dev-5fa534c987784c4811757a34c425aff3ce3b5037.zip op-kernel-dev-5fa534c987784c4811757a34c425aff3ce3b5037.tar.gz | |
coredump: ensure all coredumping tasks have SIGNAL_GROUP_COREDUMP
task_will_free_mem() is wrong in many ways, and in particular the
SIGNAL_GROUP_COREDUMP check is not reliable: a task can participate in the
coredumping without SIGNAL_GROUP_COREDUMP bit set.
change zap_threads() paths to always set SIGNAL_GROUP_COREDUMP even if
other CLONE_VM processes can't react to SIGKILL. Fortunately, at least
oom-kill case if fine; it kills all tasks sharing the same mm, so it
should also kill the process which actually dumps the core.
The change in prepare_signal() is not strictly necessary, it just ensures
that the patch does not bring another subtle behavioural change. But it
reminds us that this SIGNAL_GROUP_EXIT/COREDUMP case needs more changes.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Kyle Walker <kwalker@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Stanislav Kozina <skozina@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index f2cbd4e..c0b01fe 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -788,7 +788,7 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force) sigset_t flush; if (signal->flags & (SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP)) { - if (signal->flags & SIGNAL_GROUP_COREDUMP) + if (!(signal->flags & SIGNAL_GROUP_EXIT)) return sig == SIGKILL; /* * The process is in the middle of dying, nothing to do. |
