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check mutex owner in pthread_cond_wait

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when used with error-checking mutexes, pthread_cond_wait is required
to fail with EPERM if the mutex is not locked by the caller.
previously we relied on pthread_mutex_unlock to generate the error,
but this is not valid, since in the case of such invalid usage the
internal state of the cond variable has already been potentially
corrupted (due to access outside the control of the mutex). thus, we
have to check first.
This commit is contained in:
Rich Felker 2011-09-27 18:17:27 -04:00
parent d8dc1df1c2
commit bfae1a8b71
1 changed files with 3 additions and 0 deletions
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3
src/thread/pthread_cond_timedwait.c
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@ -37,6 +37,9 @@ int pthread_cond_timedwait(pthread_cond_t *c, pthread_mutex_t *m, const struct t
struct cm cm = { .c=c, .m=m };
int r, e=0, seq;
if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK &&
(m->_m_lock&INT_MAX) != __pthread_self()->tid) return EPERM;
if (ts && ts->tv_nsec >= 1000000000UL)
return EINVAL;