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authorOleg Nesterov <oleg@redhat.com>2015-06-04 16:22:16 -0400
committerPaul Moore <pmoore@redhat.com>2015-06-04 16:22:16 -0400
commit9e7c8f8c62c1e1cda203b5bfaba4575b141e42e7 (patch)
treeffbe4be8b34649fd07898137aeb74404f4fa093f /kernel/signal.c
parentcded3fffbeab777e6ad2ec05d4a3b62c5caca0f3 (diff)
downloadop-kernel-dev-9e7c8f8c62c1e1cda203b5bfaba4575b141e42e7.zip
op-kernel-dev-9e7c8f8c62c1e1cda203b5bfaba4575b141e42e7.tar.gz
signals: don't abuse __flush_signals() in selinux_bprm_committed_creds()
selinux_bprm_committed_creds()->__flush_signals() is not right, we shouldn't clear TIF_SIGPENDING unconditionally. There can be other reasons for signal_pending(): freezing(), JOBCTL_PENDING_MASK, and potentially more. Also change this code to check fatal_signal_pending() rather than SIGNAL_GROUP_EXIT, it looks a bit better. Now we can kill __flush_signals() before it finds another buggy user. Note: this code looks racy, we can flush a signal which was sent after the task SID has been updated. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Paul Moore <pmoore@redhat.com>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index d51c5dd..d497250 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -414,21 +414,16 @@ void flush_sigqueue(struct sigpending *queue)
}
/*
- * Flush all pending signals for a task.
+ * Flush all pending signals for this kthread.
*/
-void __flush_signals(struct task_struct *t)
-{
- clear_tsk_thread_flag(t, TIF_SIGPENDING);
- flush_sigqueue(&t->pending);
- flush_sigqueue(&t->signal->shared_pending);
-}
-
void flush_signals(struct task_struct *t)
{
unsigned long flags;
spin_lock_irqsave(&t->sighand->siglock, flags);
- __flush_signals(t);
+ clear_tsk_thread_flag(t, TIF_SIGPENDING);
+ flush_sigqueue(&t->pending);
+ flush_sigqueue(&t->signal->shared_pending);
spin_unlock_irqrestore(&t->sighand->siglock, flags);
}
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