[PATCH 21/43] userns: Convert sched_set_affinity and sched_set_scheduler's permission checks

["Eric W. Beiderman]

From: Eric W. Biederman <ebiederm at xmission.com>

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

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 kernel/sched/core.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 96bff85..b189fec 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;
 }
-- 
1.7.2.5