commit 4ac212ad4e8fafc22fa147fc255ff5fa5435cf33
author Stephen Smalley <sds@tycho.nsa.gov> Wed Aug 29 08:51:50 2007 -0400
committer James Morris <jmorris@localhost.localdomain> Thu Aug 30 20:22:47 2007 -0400
tree 9ab703429a2b24ccafc6748c1e0f2147f2b47114
parent a1c582d0720f2eff61043e90711767decf37b917

SELinux: clear parent death signal on SID transitions

Clear parent death signal on SID transitions to prevent unauthorized
signaling between SIDs.

Signed-off-by:  Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Eric Paris <eparis@parisplace.org>
Signed-off-by: James Morris <jmorris@localhost.localdomain>

security/selinux/hooks.c

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index d8bc417..3694662 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1907,6 +1907,9 @@
 		spin_unlock_irq(&current->sighand->siglock);
 	}
 
+	/* Always clear parent death signal on SID transitions. */
+	current->pdeath_signal = 0;
+
 	/* Check whether the new SID can inherit resource limits
 	   from the old SID.  If not, reset all soft limits to
 	   the lower of the current task's hard limit and the init