From: jooseong lee <jooseong.lee@samsung.com>
Date: Thu, 3 Nov 2016 10:54:39 +0000 (+0100)
Subject: BACKPORT: Smack: Assign smack_known_web label for kernel thread's
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d8c5f96afa5f1ecf0a4ddbaeca457a12f3690709;p=platform%2Fkernel%2Flinux-stable.git

BACKPORT: Smack: Assign smack_known_web label for kernel thread's

Assign smack_known_web label for kernel thread's socket

Creating struct sock by sk_alloc function in various kernel subsystems
like bluetooth doesn't call smack_socket_post_create(). In such case,
received sock label is the floor('_') label and makes access deny.

Signed-off-by: jooseong lee <jooseong.lee@samsung.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
(cherry-picked from upstream 08382c9f6efe08b8bb30645c2744480cbd8f161a)
---

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 2b747ad1afbf..03de2725adcb 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2313,8 +2313,16 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
 	if (ssp == NULL)
 		return -ENOMEM;
 
-	ssp->smk_in = skp;
-	ssp->smk_out = skp;
+	/*
+	 * Sockets created by kernel threads receive web label.
+	 */
+	if (unlikely(current->flags & PF_KTHREAD)) {
+		ssp->smk_in = &smack_known_web;
+		ssp->smk_out = &smack_known_web;
+	} else {
+		ssp->smk_in = skp;
+		ssp->smk_out = skp;
+	}
 	ssp->smk_packet = NULL;
 
 	sk->sk_security = ssp;