linux-kernel - [PATCH 21/43] userns: Convert sched_set_affinity and sched_set

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Date:	Sat,  7 Apr 2012 22:15:17 -0700
From:	"\"Eric W. Beiderman" <ebiederm@...ssion.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	<linux-fsdevel@...r.kernel.org>,
	<linux-security-module@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 21/43] userns: Convert sched_set_affinity and sched_set_scheduler's permission checks

From: Eric W. Biederman <ebiederm@...ssion.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@...ssion.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

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