linux-kernel - [ 38/42] net: fix incorrect credentials passing

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Message-Id: <20130429184756.700158878@linuxfoundation.org>
Date:	Mon, 29 Apr 2013 12:02:20 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 38/42] net: fix incorrect credentials passing

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Linus Torvalds <torvalds@...ux-foundation.org>

[ Upstream commit 83f1b4ba917db5dc5a061a44b3403ddb6e783494 ]

Commit 257b5358b32f ("scm: Capture the full credentials of the scm
sender") changed the credentials passing code to pass in the effective
uid/gid instead of the real uid/gid.

Obviously this doesn't matter most of the time (since normally they are
the same), but it results in differences for suid binaries when the wrong
uid/gid ends up being used.

This just undoes that (presumably unintentional) part of the commit.

Reported-by: Andy Lutomirski <luto@...capital.net>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Serge E. Hallyn <serge@...lyn.com>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/scm.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -56,8 +56,8 @@ static __inline__ void scm_set_cred(stru
 	scm->pid  = get_pid(pid);
 	scm->cred = cred ? get_cred(cred) : NULL;
 	scm->creds.pid = pid_vnr(pid);
-	scm->creds.uid = cred ? cred->euid : INVALID_UID;
-	scm->creds.gid = cred ? cred->egid : INVALID_GID;
+	scm->creds.uid = cred ? cred->uid : INVALID_UID;
+	scm->creds.gid = cred ? cred->gid : INVALID_GID;
 }
 
 static __inline__ void scm_destroy_cred(struct scm_cookie *scm)


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