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authorOleg Nesterov <oleg@redhat.com>2015-06-04 23:22:16 +0300
committerPaul Moore <pmoore@redhat.com>2015-06-04 23:22:16 +0300
commit9e7c8f8c62c1e1cda203b5bfaba4575b141e42e7 (patch)
treeffbe4be8b34649fd07898137aeb74404f4fa093f /security
parentcded3fffbeab777e6ad2ec05d4a3b62c5caca0f3 (diff)
downloadlinux-9e7c8f8c62c1e1cda203b5bfaba4575b141e42e7.tar.xz
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 'security')
-rw-r--r--security/selinux/hooks.c6
1 files changed, 4 insertions, 2 deletions
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(&current->sighand->siglock);
- if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) {
- __flush_signals(current);
+ if (!fatal_signal_pending(current)) {
+ flush_sigqueue(&current->pending);
+ flush_sigqueue(&current->signal->shared_pending);
flush_signal_handlers(current, 1);
sigemptyset(&current->blocked);
+ recalc_sigpending();
}
spin_unlock_irq(&current->sighand->siglock);
}