linux-kernel - [ 105/124] af_unix: dont send SCM_CREDENTIAL when dest socket is NULL

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Date:	Tue,  2 Apr 2013 15:11:27 -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, Ding Tianhong <dingtianhong@...wei.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 105/124] af_unix: dont send SCM_CREDENTIAL when dest socket is NULL

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

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


From: dingtianhong <dingtianhong@...wei.com>

[ Upstream commit 14134f6584212d585b310ce95428014b653dfaf6 ]

SCM_SCREDENTIALS should apply to write() syscalls only either source or destination
socket asserted SOCK_PASSCRED. The original implememtation in maybe_add_creds is wrong,
and breaks several LSB testcases ( i.e. /tset/LSB.os/netowkr/recvfrom/T.recvfrom).

Origionally-authored-by: Karel Srot <ksrot@...hat.com>
Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/unix/af_unix.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1414,8 +1414,8 @@ static void maybe_add_creds(struct sk_bu
 	if (UNIXCB(skb).cred)
 		return;
 	if (test_bit(SOCK_PASSCRED, &sock->flags) ||
-	    !other->sk_socket ||
-	    test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) {
+	    (other->sk_socket &&
+	    test_bit(SOCK_PASSCRED, &other->sk_socket->flags))) {
 		UNIXCB(skb).pid  = get_pid(task_tgid(current));
 		UNIXCB(skb).cred = get_current_cred();
 	}


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