[PATCH] lsm: add task_setioprio hook
Implement an LSM hook for setting a task's IO priority, similar to the hook
for setting a tasks's nice value.
A previous version of this LSM hook was included in an older version of
multiadm by Jan Engelhardt, although I don't recall it being submitted
upstream.
Also included is the corresponding SELinux hook, which re-uses the setsched
permission in the proccess class.
Signed-off-by: James Morris <jmorris@namei.org>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/ioprio.c b/fs/ioprio.c
index ca77008..7fa76ed 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -24,15 +24,21 @@
#include <linux/blkdev.h>
#include <linux/capability.h>
#include <linux/syscalls.h>
+#include <linux/security.h>
static int set_task_ioprio(struct task_struct *task, int ioprio)
{
+ int err;
struct io_context *ioc;
if (task->uid != current->euid &&
task->uid != current->uid && !capable(CAP_SYS_NICE))
return -EPERM;
+ err = security_task_setioprio(task, ioprio);
+ if (err)
+ return err;
+
task_lock(task);
task->ioprio = ioprio;