Smack: Assign smack_known_web label for kernel thread's socket in the sk_alloc_securi...

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

Change-Id: I614c5f0e6d59be5ca6b49f0581edfef79fc334cf
Signed-off-by: jooseong lee <jooseong.lee@samsung.com>

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index f0cea06..7e800c6 100644 (file)
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2145,8 +2145,16 @@ 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;