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authorDavid Quigley <dpquigl@tycho.nsa.gov>2006-06-23 13:04:00 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 18:42:54 +0400
commit22fb52dd736a62e24c44c50739007496265dc38c (patch)
tree06cc6dcff21df6e18f189c6895cf6aa313e7a8ea
parente7834f8fccd791225a1cf91c2c3e740ad8e2e145 (diff)
downloadlinux-22fb52dd736a62e24c44c50739007496265dc38c.tar.xz
[PATCH] SELinux: add security hook call to mediate attach_task (kernel/cpuset.c)
Add 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. Signed-off-by: David Quigley <dpquigl@tycho.nsa.gov> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org> Acked-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--kernel/cpuset.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 77f45ffd5ea1..b602f73fb38d 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -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, char *pidbuf, char **ppathbuf)
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, char *pidbuf, char **ppathbuf)
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);