security: remove unused parameter from security_task_setscheduler()

All security modules shouldn't change sched_param parameter of
security_task_setscheduler().  This is not only meaningless, but also
make a harmful result if caller pass a static variable.

This patch remove policy and sched_param parameter from
security_task_setscheduler() becuase none of security module is
using it.

Cc: James Morris <jmorris@namei.org>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: James Morris <jmorris@namei.org>

4 files changed, 7 insertions, 12 deletions

diff --git a/security/commoncap.c b/security/commoncap.c
index 9d172e6e330c..5e632b4857e4 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -719,14 +719,11 @@ static int cap_safe_nice(struct task_struct *p)
 /**
  * cap_task_setscheduler - Detemine if scheduler policy change is permitted
  * @p: The task to affect
- * @policy: The policy to effect
- * @lp: The parameters to the scheduling policy
  *
  * Detemine if the requested scheduler policy change is permitted for the
  * specified task, returning 0 if permission is granted, -ve if denied.
  */
-int cap_task_setscheduler(struct task_struct *p, int policy,
-                           struct sched_param *lp)
+int cap_task_setscheduler(struct task_struct *p)
 {
         return cap_safe_nice(p);
 }
diff --git a/security/security.c b/security/security.c
index 43b6463ebbfb..1cbcdfa4b015 100644
--- a/security/security.c
+++ b/security/security.c
@@ -778,10 +778,9 @@ int security_task_setrlimit(struct task_struct *p, unsigned int resource,
         return security_ops->task_setrlimit(p, resource, new_rlim);
 }
 
-int security_task_setscheduler(struct task_struct *p,
-                                int policy, struct sched_param *lp)
+int security_task_setscheduler(struct task_struct *p)
 {
-        return security_ops->task_setscheduler(p, policy, lp);
+        return security_ops->task_setscheduler(p);
 }
 
 int security_task_getscheduler(struct task_struct *p)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4796ddd4e721..db2b331de89a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3354,11 +3354,11 @@ static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
         return 0;
 }
 
-static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
+static int selinux_task_setscheduler(struct task_struct *p)
 {
         int rc;
 
-        rc = cap_task_setscheduler(p, policy, lp);
+        rc = cap_task_setscheduler(p);
         if (rc)
                 return rc;
 
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index c448d57ae2b7..174aec44bfac 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1281,12 +1281,11 @@ static int smack_task_getioprio(struct task_struct *p)
  *
  * Return 0 if read access is permitted
  */
-static int smack_task_setscheduler(struct task_struct *p, int policy,
-                                   struct sched_param *lp)
+static int smack_task_setscheduler(struct task_struct *p)
 {
         int rc;
 
-        rc = cap_task_setscheduler(p, policy, lp);
+        rc = cap_task_setscheduler(p);
         if (rc == 0)
                 rc = smk_curacc_on_task(p, MAY_WRITE);
         return rc;