linux-kernel - [PATCH review 05/16] userns: Allow unprivileged users to create new namespaces

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Message-Id: <1353337961-12962-5-git-send-email-ebiederm@xmission.com>
Date:	Mon, 19 Nov 2012 07:12:30 -0800
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Linux Containers <containers@...ts.linux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH review 05/16] userns: Allow unprivileged users to create new namespaces

From: "Eric W. Biederman" <ebiederm@...ssion.com>

If an unprivileged user has the appropriate capabilities in their
current user namespace allow the creation of new namespaces.

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 kernel/nsproxy.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 7f8b051..a214e0e 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -122,6 +122,7 @@ out_ns:
 int copy_namespaces(unsigned long flags, struct task_struct *tsk)
 {
 	struct nsproxy *old_ns = tsk->nsproxy;
+	struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns);
 	struct nsproxy *new_ns;
 	int err = 0;
 
@@ -134,7 +135,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
 				CLONE_NEWPID | CLONE_NEWNET)))
 		return 0;
 
-	if (!capable(CAP_SYS_ADMIN)) {
+	if (!ns_capable(user_ns, CAP_SYS_ADMIN)) {
 		err = -EPERM;
 		goto out;
 	}
@@ -191,7 +192,7 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
 			       CLONE_NEWNET | CLONE_NEWPID)))
 		return 0;
 
-	if (!capable(CAP_SYS_ADMIN))
+	if (!nsown_capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
 	*new_nsp = create_new_namespaces(unshare_flags, current,
-- 
1.7.5.4

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