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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-10 10:33:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-10 10:33:55 -0800 |
| commit | eccc876724927ff3b9ff91f36f7b6b159e948f0c (patch) | |
| tree | 034dea9d11432421320e2ed0e5a2d36025cc808a | |
| parent | e2f0c565ec70eb9e4d3b98deb5892af62de8b98d (diff) | |
| parent | 77f6ab8b7768cf5e6bdd0e72499270a0671506ee (diff) | |
| download | bmc-eccc876724927ff3b9ff91f36f7b6b159e948f0c.tar.gz | |
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull core dump fix from Al Viro:
"Fix for multithreaded coredump playing fast and loose with getting
registers of secondary threads; if a secondary gets caught in the
middle of exit(2), the conditition it will be stopped in for dumper to
examine might be unusual enough for things to go wrong.
Quite a few architectures are fine with that, but some are not."
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
don't dump the threads that had been already exiting when zapped.
| -rw-r--r-- | kernel/exit.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 87a2d515de0d5b..1f236ed375f83c 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -454,7 +454,10 @@ static void exit_mm(void) mmap_read_unlock(mm); self.task = current; - self.next = xchg(&core_state->dumper.next, &self); + if (self.task->flags & PF_SIGNALED) + self.next = xchg(&core_state->dumper.next, &self); + else + self.task = NULL; /* * Implies mb(), the result of xchg() must be visible * to core_state->dumper. |