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From ea1c9711146e251c809ecf7eb348b548ac6e967c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Bollo?= <jose.bollo@iot.bzh>
Date: Wed, 2 Nov 2016 11:01:15 +0100
Subject: [PATCH 56/56] Smack: Assign smack_known_web label for kernel thread's
socket in the sk_alloc_security hook
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Creating struct sock by sk_alloc function in various kernel subsystems
like bluetooth dosen't call smack_socket_post_create(). In such case,
received sock label is the floor('_') label and makes access deny.
Refers-to: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7412301b76bd53ee53b860f611fc3b5b1c2245b5
Refers-to: https://review.tizen.org/gerrit/#/c/80717/4
Change-Id: I614c5f0e6d59be5ca6b49f0581edfef79fc334cf
Signed-off-by: jooseong lee <jooseong.lee@samsung.com>
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
---
security/smack/smack_lsm.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index ff696e7..94914db 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2075,8 +2075,16 @@ 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;
--
2.7.4
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