[patch 11/12] SELinux: clear parent death signal on SID transitions

[Greg KH]

From: Stephen Smalley <sds@xxxxxxxxxxxxx>

commit 4ac212ad4e8fafc22fa147fc255ff5fa5435cf33 upstream.

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

Signed-off-by:  Stephen Smalley <sds@xxxxxxxxxxxxx>
Acked-by: Eric Paris <eparis@xxxxxxxxxxxxxx>
Signed-off-by: James Morris <jmorris@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 security/selinux/hooks.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1906,6 +1906,9 @@ static void selinux_bprm_post_apply_cred
 		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

-- 
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