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Fix setxid race handling exiting threads

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This commit is contained in:
Andreas Schwab 2010-06-25 10:41:17 +02:00
parent 2bc174332b
commit 523df51151
2 changed files with 15 additions and 1 deletions
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5
nptl/ChangeLog
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@ -1,3 +1,8 @@
2011-08-31 Andreas Schwab <schwab@redhat.com>
* allocatestack.c (setxid_mark_thread): Ensure that the exiting
thread is woken up.
2011-08-20 David S. Miller <davem@davemloft.net> 2011-08-20 David S. Miller <davem@davemloft.net>
* Makefile (tst-cleanup0.out): Fix typo in output redirection. * Makefile (tst-cleanup0.out): Fix typo in output redirection.

11
nptl/allocatestack.c
View File

@ -999,7 +999,16 @@ setxid_mark_thread (struct xid_command *cmdp, struct pthread *t)
/* If the thread is exiting right now, ignore it. */ /* If the thread is exiting right now, ignore it. */
if ((ch & EXITING_BITMASK) != 0) if ((ch & EXITING_BITMASK) != 0)
return; {
/* Release the futex if there is no other setxid in
progress. */
if ((ch & SETXID_BITMASK) == 0)
{
t->setxid_futex = 1;
lll_futex_wake (&t->setxid_futex, 1, LLL_PRIVATE);
}
return;
}
} }
while (atomic_compare_and_exchange_bool_acq (&t->cancelhandling, while (atomic_compare_and_exchange_bool_acq (&t->cancelhandling,
ch | SETXID_BITMASK, ch)); ch | SETXID_BITMASK, ch));