[PATCH] Restore LSM hook calls to setpriority and setpgid

This patch restores the LSM hook calls in setpriority and setpgid to
2.5.58.  These hooks were previously added as of 2.5.27, but the hook
calls were subsequently lost as a result of other changes to the code
as of 2.5.37.

Ingo has signed off on this patch, and no one else has objected.

kernel/sys.c

@@ -212,18 +212,25 @@ cond_syscall(sys_delete_module)
 
 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {
+	int no_nice;
+
 	if (p->uid != current->euid &&
 		p->uid != current->uid && !capable(CAP_SYS_NICE)) {
 		error = -EPERM;
 		goto out;
 	}
-
+	if (niceval < task_nice(p) && !capable(CAP_SYS_NICE)) {
+		error = -EACCES;
+		goto out;
+	}
+	no_nice = security_task_setnice(p, niceval);
+	if (no_nice) {
+		error = no_nice;
+		goto out;
+	}
 	if (error == -ESRCH)
 		error = 0;
-	if (niceval < task_nice(p) && !capable(CAP_SYS_NICE))
-		error = -EACCES;
-	else
-		set_user_nice(p, niceval);
+	set_user_nice(p, niceval);
 out:
 	return error;
 }
@@ -944,6 +951,10 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	}
 
 ok_pgid:
+	err = security_task_setpgid(p, pgid);
+	if (err)
+		goto out;
+
 	if (p->pgrp != pgid) {
 		detach_pid(p, PIDTYPE_PGID);
 		p->pgrp = pgid;