linux-kernel - [PATCH] smack: Fix a bidirectional UDS connect check typo

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Date:	Mon, 29 Dec 2014 15:34:58 +0100
From:	Zbigniew Jasinski <z.jasinski@...sung.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] smack: Fix a bidirectional UDS connect check typo

The 54e70ec5eb090193b03e69d551fa6771a5a217c4 commit introduced a
bidirectional check that should have checked for mutual WRITE access
between two labels. Due to a typo subject's OUT label is checked with
object's OUT. Should be OUT to IN.

Signed-off-by: Zbigniew Jasinski <z.jasinski@...sung.com>
---
 security/smack/smack_lsm.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index b774029..30f61f8 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3313,7 +3313,7 @@ static int smack_unix_stream_connect(struct sock *sock,
 
 	if (!smack_privileged(CAP_MAC_OVERRIDE)) {
 		skp = ssp->smk_out;
-		okp = osp->smk_out;
+		okp = osp->smk_in;
 #ifdef CONFIG_AUDIT
 		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
 		smk_ad_setfield_u_net_sk(&ad, other);
@@ -3321,6 +3321,8 @@ static int smack_unix_stream_connect(struct sock *sock,
 		rc = smk_access(skp, okp, MAY_WRITE, &ad);
 		rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
 		if (rc == 0) {
+			okp = osp->smk_out;
+			skp = ssp->smk_in;
 			rc = smk_access(okp, skp, MAY_WRITE, NULL);
 			rc = smk_bu_note("UDS connect", okp, skp,
 						MAY_WRITE, rc);
-- 
1.7.9.5

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