IB/core: Enforce security on management datagrams

Allocate and free a security context when creating and destroying a MAD
agent.  This context is used for controlling access to PKeys and sending
and receiving SMPs.

When sending or receiving a MAD check that the agent has permission to
access the PKey for the Subnet Prefix of the port.

During MAD and snoop agent registration for SMI QPs check that the
calling process has permission to access the manage the subnet  and
register a callback with the LSM to be notified of policy changes. When
notificaiton of a policy change occurs recheck permission and set a flag
indicating sending and receiving SMPs is allowed.

When sending and receiving MADs check that the agent has access to the
SMI if it's on an SMI QP.  Because security policy can change it's
possible permission was allowed when creating the agent, but no longer
is.

Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Acked-by: Doug Ledford <dledford@redhat.com>
[PM: remove the LSM hook init code]
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/security/security.c b/security/security.c
index b59be0d6535f..714433e3e9a2 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1544,6 +1544,12 @@ int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
 }
 EXPORT_SYMBOL(security_ib_pkey_access);
 
+int security_ib_endport_manage_subnet(void *sec, const char *dev_name, u8 port_num)
+{
+	return call_int_hook(ib_endport_manage_subnet, 0, sec, dev_name, port_num);
+}
+EXPORT_SYMBOL(security_ib_endport_manage_subnet);
+
 int security_ib_alloc_security(void **sec)
 {
 	return call_int_hook(ib_alloc_security, 0, sec);