netdev - [PATCH net-next 08/17] net: Allow userns root to force the scm creds

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Message-Id: <1353070992-5552-8-git-send-email-ebiederm@xmission.com>
Date:	Fri, 16 Nov 2012 05:03:03 -0800
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	David Miller <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>, Serge Hallyn <serge@...lyn.com>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH net-next 08/17] net: Allow userns root to force the scm creds

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

If the user calling sendmsg has the appropriate privieleges
in their user namespace allow them to set the uid, gid, and
pid in the SCM_CREDENTIALS control message to any valid value.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 net/core/scm.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/scm.c b/net/core/scm.c
index ab57084..57fb1ee 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -51,11 +51,11 @@ static __inline__ int scm_check_creds(struct ucred *creds)
 	if (!uid_valid(uid) || !gid_valid(gid))
 		return -EINVAL;
 
-	if ((creds->pid == task_tgid_vnr(current) || capable(CAP_SYS_ADMIN)) &&
+	if ((creds->pid == task_tgid_vnr(current) || nsown_capable(CAP_SYS_ADMIN)) &&
 	    ((uid_eq(uid, cred->uid)   || uid_eq(uid, cred->euid) ||
-	      uid_eq(uid, cred->suid)) || capable(CAP_SETUID)) &&
+	      uid_eq(uid, cred->suid)) || nsown_capable(CAP_SETUID)) &&
 	    ((gid_eq(gid, cred->gid)   || gid_eq(gid, cred->egid) ||
-	      gid_eq(gid, cred->sgid)) || capable(CAP_SETGID))) {
+	      gid_eq(gid, cred->sgid)) || nsown_capable(CAP_SETGID))) {
 	       return 0;
 	}
 	return -EPERM;
-- 
1.7.5.4

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