[RFC][PATCH] Restore LSM hook calls to setpriority and setpgid

[RFC][PATCH] Restore LSM hook calls to setpriority and setpgid

[Stephen D. Smalley]

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.

If anyone has any objections to these changes, please let me know.

 sys.c |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)
-----

===== kernel/sys.c 1.38 vs edited =====
--- 1.38/kernel/sys.c	Thu Dec  5 21:56:43 2002
+++ edited/kernel/sys.c	Tue Jan 14 16:02:15 2003
@@ -212,18 +212,25 @@
 
 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 @@
 	}
 
 ok_pgid:
+	err = security_task_setpgid(p, pgid);
+	if (err)
+		goto out;
+
 	if (p->pgrp != pgid) {
 		detach_pid(p, PIDTYPE_PGID);
 		p->pgrp = pgid;


--
Stephen Smalley, NSA
sds@epoch.ncsc.mil