linux-kernel - [REVIEW][PATCH 2/5] userns: Allow PR_CAPBSET

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Date:	Thu, 29 Aug 2013 16:54:00 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Linux Containers <containers@...ts.linux-foundation.org>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	<linux-kernel@...r.kernel.org>, Richard Weinberger <richard@....at>
Subject: [REVIEW][PATCH 2/5] userns: Allow PR_CAPBSET_DROP in a user namespace.


As the capabilites and capability bounding set are per user namespace
properties it is safe to allow changing them with just CAP_SETPCAP
permission in the user namespace.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Tested-by: Richard Weinberger <richard@....at>
---
 security/commoncap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/security/commoncap.c b/security/commoncap.c
index c44b6fe..9fccf71 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -824,7 +824,7 @@ int cap_task_setnice(struct task_struct *p, int nice)
  */
 static long cap_prctl_drop(struct cred *new, unsigned long cap)
 {
-	if (!capable(CAP_SETPCAP))
+	if (!ns_capable(current_user_ns(), CAP_SETPCAP))
 		return -EPERM;
 	if (!cap_valid(cap))
 		return -EINVAL;
-- 
1.7.5.4

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