From 9e7c8f8c62c1e1cda203b5bfaba4575b141e42e7 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 4 Jun 2015 16:22:16 -0400 Subject: 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 Signed-off-by: Paul Moore --- security/selinux/hooks.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'security') diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 99c4a00cce4e..8abbd548ece9 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2416,10 +2416,12 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm) for (i = 0; i < 3; i++) do_setitimer(i, &itimer, NULL); spin_lock_irq(¤t->sighand->siglock); - if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) { - __flush_signals(current); + if (!fatal_signal_pending(current)) { + flush_sigqueue(¤t->pending); + flush_sigqueue(¤t->signal->shared_pending); flush_signal_handlers(current, 1); sigemptyset(¤t->blocked); + recalc_sigpending(); } spin_unlock_irq(¤t->sighand->siglock); } -- cgit v1.2.3