diff options
| author |   Lontke Michael <michael.lontke@elektrobit.com> | 2022-08-31 14:03:26 +0200 |
|---|---|---|
| committer |   Casey Schaufler <casey@schaufler-ca.com> | 2022-09-27 10:33:03 -0700 |
| commit | 4ca165fc6c49c3b0100f61524ffbca4743d46e8d (patch) | |
| tree | d4173b1c3e8290074b3329be13e39a44d2d51629 /security | |
| parent | Linux 6.0-rc3 (diff) | |
| download | linux-dev-4ca165fc6c49c3b0100f61524ffbca4743d46e8d.tar.xz linux-dev-4ca165fc6c49c3b0100f61524ffbca4743d46e8d.zip | |
SMACK: Add sk_clone_security LSM hook
Using smk_of_current() during sk_alloc_security hook leads in
rare cases to a faulty initialization of the security context
of the created socket.
By adding the LSM hook sk_clone_security to SMACK this initialization
fault is corrected by copying the security context of the old socket
pointer to the newly cloned one.
Co-authored-by: Martin Ostertag: <martin.ostertag@elektrobit.com>
Signed-off-by: Lontke Michael <michael.lontke@elektrobit.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/smack/smack_lsm.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 001831458fa2..077bf6fd569b 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2279,6 +2279,21 @@ static void smack_sk_free_security(struct sock *sk) } /** + * smack_sk_clone_security - Copy security context + * @sk: the old socket + * @newsk: the new socket + * + * Copy the security context of the old socket pointer to the cloned + */ +static void smack_sk_clone_security(const struct sock *sk, struct sock *newsk) +{ + struct socket_smack *ssp_old = sk->sk_security; + struct socket_smack *ssp_new = newsk->sk_security; + + *ssp_new = *ssp_old; +} + +/** * smack_ipv4host_label - check host based restrictions * @sip: the object end * @@ -4851,6 +4866,7 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), + LSM_HOOK_INIT(sk_clone_security, smack_sk_clone_security), LSM_HOOK_INIT(sock_graft, smack_sock_graft), LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), |