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

Greg KH
2007-10-08T18:41:43Z

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From: Stephen Smalley <sds@tycho.nsa.gov>

commit 4ac212ad4e8fafc22fa147fc255ff5fa5435cf33 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
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

--