From 6e588814ea9a536ac74a7f09f127a6843a80d817 Mon Sep 17 00:00:00 2001 From: jooseong lee Date: Wed, 20 Jul 2016 10:07:11 +0900 Subject: [PATCH] Smack: Assign smack_known_web label for kernel thread's socket in the sk_alloc_security hook 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 --- 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 4213de5b5014..44731d3d5f65 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2312,8 +2312,16 @@ 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; -- 2.34.1