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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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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.
This commit is contained in:
Linus Torvalds 2020-11-10 10:33:55 -08:00
commit eccc876724
1 changed files with 4 additions and 1 deletions
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5
kernel/exit.c
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@ -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.