From: Eric W. Biederman <ebiederm@xmission.com>
Date: Fri, 3 Feb 2012 02:54:02 +0000 (-0800)
Subject: userns: Convert sched_set_affinity and sched_set_scheduler's permission checks
X-Git-Tag: v3.5-rc1~107^2~25
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9c806aa06f8e121c6058db8e8073798aa5c4355b;p=karo-tx-linux.git

userns: Convert sched_set_affinity and sched_set_scheduler's permission checks

- Compare kuids with uid_eq
- kuid are uniuqe across all user namespaces so there is no longer the
  need for a user_namespace comparison.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 96bff855b866..b189fecaef90 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4042,11 +4042,8 @@ static bool check_same_owner(struct task_struct *p)
 
 	rcu_read_lock();
 	pcred = __task_cred(p);
-	if (cred->user_ns == pcred->user_ns)
-		match = (cred->euid == pcred->euid ||
-			 cred->euid == pcred->uid);
-	else
-		match = false;
+	match = (uid_eq(cred->euid, pcred->euid) ||
+		 uid_eq(cred->euid, pcred->uid));
 	rcu_read_unlock();
 	return match;
 }