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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>
This commit is contained in:
jooseong lee 2016-11-03 11:54:39 +01:00 committed by Casey Schaufler
parent 07d9a38068
commit 08382c9f6e
1 changed files with 10 additions and 2 deletions
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12
security/smack/smack_lsm.c
View File

@ -2337,8 +2337,16 @@ 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;