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Protect sigqueue_take() call by child process's lock, it fixed a

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potential race with ptrace 'attach' which changes parent of the
child process.
This commit is contained in:
David Xu 2006-10-24 12:04:21 +00:00
parent 3c925ad2aa
commit e94cc4ac30
1 changed files with 2 additions and 2 deletions

4
sys/kern/kern_exit.c

@ -843,11 +843,11 @@ loop:
td->td_retval[0] = p->p_pid;
if (status)
*status = W_STOPCODE(p->p_xstat);
PROC_UNLOCK(p);
PROC_LOCK(q);
sigqueue_take(p->p_ksi);
PROC_UNLOCK(q);
PROC_UNLOCK(p);
return (0);
}
@ -856,11 +856,11 @@ loop:
sx_xunlock(&proctree_lock);
td->td_retval[0] = p->p_pid;
p->p_flag &= ~P_CONTINUED;
PROC_UNLOCK(p);
PROC_LOCK(q);
sigqueue_take(p->p_ksi);
PROC_UNLOCK(q);
PROC_UNLOCK(p);
if (status)
*status = SIGCONT;