[PATCH 1/2] SELinux: Add security hooks to {get,set}affinity

[James Morris]

From: David Quigley <dpquigl@xxxxxxxxxxxxx>

This patch adds LSM hooks into the setaffinity and getaffinity functions 
to enable security modules to control these operations between tasks with 
different security attributes. This implementation uses the existing 
task_setscheduler and task_getscheduler LSM hooks.

This is aimed at 2.6.18 inclusion to cover new code currently unmediated 
by SELinux.

Please apply.

Signed-Off-By: David Quigley <dpquigl@xxxxxxxxxxxxx>
Acked-by:  Stephen Smalley <sds@xxxxxxxxxxxxx>
Signed-off-by: James Morrisj <jmorris@xxxxxxxxx>

---

kernel/sched.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff -uprN -X /home/dpquigl/dontdiff linux-2.6.17-rc6-mm2/kernel/sched.c linux-2.6.17-rc6-mm2-affinity/kernel/sched.c
--- linux-2.6.17-rc6-mm2/kernel/sched.c	2006-06-15 09:46:28.000000000 -0400
+++ linux-2.6.17-rc6-mm2-affinity/kernel/sched.c	2006-06-15 09:51:55.000000000 -0400
@@ -4266,6 +4266,10 @@ long sched_setaffinity(pid_t pid, cpumas
 			!capable(CAP_SYS_NICE))
 		goto out_unlock;
 
+	retval = security_task_setscheduler(p, 0, NULL);
+	if (retval)
+		goto out_unlock;
+
 	cpus_allowed = cpuset_cpus_allowed(p);
 	cpus_and(new_mask, new_mask, cpus_allowed);
 	retval = set_cpus_allowed(p, new_mask);
@@ -4334,7 +4338,10 @@ long sched_getaffinity(pid_t pid, cpumas
 	if (!p)
 		goto out_unlock;
 
-	retval = 0;
+	retval = security_task_getscheduler(p);
+	if (retval)
+		goto out_unlock;
+
 	cpus_and(*mask, p->cpus_allowed, cpu_online_map);
 
 out_unlock:


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