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authorOleg Nesterov <oleg@redhat.com>2015-11-06 16:32:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commit5fa534c987784c4811757a34c425aff3ce3b5037 (patch)
tree09aa19be1afc7e10913f29758055c2056d5d3695 /kernel
parent9317bb9696566e6759203ffcaa80481b725785b3 (diff)
downloadlinux-5fa534c987784c4811757a34c425aff3ce3b5037.tar.bz2
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')
-rw-r--r--kernel/signal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index f2cbd4ed5cd4..c0b01fe24bbd 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.