meta-agl-bsp/meta-freescale-layer/recipes-kernel/linux/files/0004-Smack-Assign-smack_known_web-label-for-kernel-thread.patch

   1 From c8bbb0f916de54610513e376070aea531af19dd6 Mon Sep 17 00:00:00 2001
   2 From: jooseong lee <jooseong.lee@samsung.com>
   3 Date: Thu, 3 Nov 2016 10:55:43 +0100
   4 Subject: [PATCH 4/4] Smack: Assign smack_known_web label for kernel thread's
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Assign smack_known_web label for kernel thread's socket in the sk_alloc_security hook
  10
  11 Creating struct sock by sk_alloc function in various kernel subsystems
  12 like bluetooth dosen't call smack_socket_post_create(). In such case,
  13 received sock label is the floor('_') label and makes access deny.
  14
  15 Refers-to: https://review.tizen.org/gerrit/#/c/80717/4
  16
  17 Change-Id: I2e5c9359bfede84a988fd4d4d74cdb9dfdfc52d8
  18 Signed-off-by: jooseong lee <jooseong.lee@samsung.com>
  19 Signed-off-by: José Bollo <jose.bollo@iot.bzh>
  20 ---
  21  security/smack/smack_lsm.c | 12 ++++++++++--
  22  1 file changed, 10 insertions(+), 2 deletions(-)
  23
  24 diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
  25 index e45f0a3..a3f3ccc 100644
  26 --- a/security/smack/smack_lsm.c
  27 +++ b/security/smack/smack_lsm.c
  28 @@ -2107,8 +2107,16 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
  29         if (ssp == NULL)
  30                 return -ENOMEM;
  31
  32 -       ssp->smk_in = skp;
  33 -       ssp->smk_out = skp;
  34 +       /*
  35 +        * Sockets created by kernel threads receive web label.
  36 +        */
  37 +       if (unlikely(current->flags & PF_KTHREAD)) {
  38 +               ssp->smk_in = &smack_known_web;
  39 +               ssp->smk_out = &smack_known_web;
  40 +       } else {
  41 +               ssp->smk_in = skp;
  42 +               ssp->smk_out = skp;
  43 +       }
  44         ssp->smk_packet = NULL;
  45
  46         sk->sk_security = ssp;
  47 --
  48 2.7.4
  49