[PATCH v2 4/4] smack: provide socketpair callback
From: casey@schaufler-ca.com (Casey Schaufler)
Date: 2018-05-04 22:01:32
Also in:
lkml, netdev, selinux
On 5/4/2018 7:28 AM, David Herrmann wrote:
From: Tom Gundersen <redacted> Make sure to implement the new socketpair callback so the SO_PEERSEC call on socketpair(2)s will return correct information. Signed-off-by: Tom Gundersen <redacted> Signed-off-by: David Herrmann <redacted>
This doesn't look like it will cause any problems. I've only been able to test it in a general way. I haven't created specific tests, but it passes the usual Smack use cases. Acked-by: Casey Schaufler <casey@schaufler-ca.com>
quoted hunk ↗ jump to hunk
--- security/smack/smack_lsm.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 0b414836bebd..dcb976f98df2 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c@@ -2842,6 +2842,27 @@ static int smack_socket_post_create(struct socket *sock, int family, return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); } +/** + * smack_socket_socketpair - create socket pair + * @socka: one socket + * @sockb: another socket + * + * Cross reference the peer labels for SO_PEERSEC + * + * Returns 0 on success, and error code otherwise + */ +static int smack_socket_socketpair(struct socket *socka, + struct socket *sockb) +{ + struct socket_smack *asp = socka->sk->sk_security; + struct socket_smack *bsp = sockb->sk->sk_security; + + asp->smk_packet = bsp->smk_out; + bsp->smk_packet = asp->smk_out; + + return 0; +} + #ifdef SMACK_IPV6_PORT_LABELING /** * smack_socket_bind - record port binding information.@@ -4724,6 +4745,7 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), + LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), #ifdef SMACK_IPV6_PORT_LABELING LSM_HOOK_INIT(socket_bind, smack_socket_bind), #endif
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