From: David Quigley <[email protected]>
This patch adds a security hook call to enable security modules to control
the ability to attach a task to a cpuset. While limited control over this
operation is possible via permission checks on the pseudo fs interface,
those checks are not sufficient to control access to the target task,
which is looked up in this function. The existing task_setscheduler hook
is re-used for this operation since this falls under the same class of
operations.
This is aimed at 2.6.18 inclusion to cover new code currently unmediated
by SELinux.
Please apply.
Signed-Off-By: David Quigley <[email protected]>
Acked-by: Stephen Smalley <[email protected]>
Signed-off-by: James Morris <[email protected]>
---
kernel/cpuset.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff -uprN -X /home/dpquigl/dontdiff linux-2.6.17-rc6-mm2/kernel/cpuset.c linux-2.6.17-rc6-mm2-attach/kernel/cpuset.c
--- linux-2.6.17-rc6-mm2/kernel/cpuset.c 2006-06-15 09:46:28.000000000 -0400
+++ linux-2.6.17-rc6-mm2-attach/kernel/cpuset.c 2006-06-15 09:52:43.000000000 -0400
@@ -41,6 +41,7 @@
#include <linux/rcupdate.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
+#include <linux/security.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
@@ -1177,6 +1178,7 @@ static int attach_task(struct cpuset *cs
cpumask_t cpus;
nodemask_t from, to;
struct mm_struct *mm;
+ int retval;
if (sscanf(pidbuf, "%d", &pid) != 1)
return -EIO;
@@ -1205,6 +1207,12 @@ static int attach_task(struct cpuset *cs
get_task_struct(tsk);
}
+ retval = security_task_setscheduler(tsk, 0, NULL);
+ if (retval) {
+ put_task_struct(tsk);
+ return retval;
+ }
+
mutex_lock(&callback_mutex);
task_lock(tsk);
-
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