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SubjectRe: [PATCH 1/1] Smack: Assign smack_known_web as default smk_in label for kernel thread's socket
On 1/22/2015 6:40 AM, Marcin Lis wrote:
> This change fixes the bug associated with sockets owned by kernel threads. These
> sockets, created usually by network devices' drivers tasks, received smk_in
> label from the task that created them - the "floor" label in the most cases. The
> result was that they were not able to receive data packets because of missing
> smack rules. The main reason of the access deny is that the socket smk_in label
> is placed as the object during smk check, kernel thread's capabilities are
> omitted.
>
> Signed-off-by: Marcin Lis <m.lis@samsung.com>

Applied to git://git.gitorious.org/smack-next/kernel.git#smack-for-4.1

> ---
> security/smack/smack_lsm.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index a688f7b..535a06a 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -2452,7 +2452,20 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
> static int smack_socket_post_create(struct socket *sock, int family,
> int type, int protocol, int kern)
> {
> - if (family != PF_INET || sock->sk == NULL)
> + struct socket_smack *ssp;
> +
> + if (sock->sk == NULL)
> + return 0;
> +
> + /*
> + * Sockets created by kernel threads receive web label.
> + */
> + if (unlikely(current->flags & PF_KTHREAD)) {
> + ssp = sock->sk->sk_security;
> + ssp->smk_in = &smack_known_web;
> + }
> +
> + if (family != PF_INET)
> return 0;
> /*
> * Set the outbound netlbl.



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