Signed-off-by: Claudio Scordino <cloud.of.andor@gmail.com>
--- sys.c	2006-04-18 12:54:38.000000000 -0400
+++ sys.new.c	2006-04-18 12:58:41.000000000 -0400
@@ -1767,9 +1767,29 @@
 
 asmlinkage long sys_getrusage(int who, struct rusage __user *ru)
 {
-	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
-		return -EINVAL;
-	return getrusage(current, who, ru);
+	struct rusage r;
+	struct task_struct* tsk = current;
+	read_lock(&tasklist_lock);
+	if ((who != RUSAGE_SELF) && (who != RUSAGE_CHILDREN)) {
+		tsk = find_task_by_pid(who);
+		if ((tsk == NULL) || (who <=0)) 
+			goto bad;
+		if (((current->uid != tsk->euid) ||
+			(current->uid != tsk->suid) ||
+			(current->uid != tsk->uid) ||
+			(current->gid != tsk->egid) ||
+			(current->gid != tsk->sgid) ||
+			(current->gid != tsk->gid)) && !capable(CAP_SYS_PTRACE))
+				goto bad;
+		who = RUSAGE_SELF;
+	}
+	k_getrusage(tsk, who, &r);
+	read_unlock(&tasklist_lock);
+	return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
+
+bad:
+	read_unlock(&tasklist_lock);
+	return tsk ? -EPERM : -EINVAL;
 }
 
 asmlinkage long sys_umask(int mask)