Commit 998f5040 authored by David Howells's avatar David Howells
Browse files

security: Add hooks to rule on setting a watch 



Add security hooks that will allow an LSM to rule on whether or not a watch
may be set.  More than one hook is required as the watches watch different
types of object.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarJames Morris <jamorris@linux.microsoft.com>
cc: Casey Schaufler <casey@schaufler-ca.com>
cc: Stephen Smalley <sds@tycho.nsa.gov>
cc: linux-security-module@vger.kernel.org
parent c73be61c

include/linux/lsm_hook_defs.h

+4 −0
Original line number Diff line number Diff line
@@ -256,6 +256,10 @@ LSM_HOOK(int, 0, inode_getsecctx, struct inode *inode, void **ctx, 
#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE)

LSM_HOOK(int, 0, post_notification, const struct cred *w_cred,

	 const struct cred *cred, struct watch_notification *n)

#endif /* CONFIG_SECURITY && CONFIG_WATCH_QUEUE */



#if defined(CONFIG_SECURITY) && defined(CONFIG_KEY_NOTIFICATIONS)

LSM_HOOK(int, 0, watch_key, struct key *key)

#endif /* CONFIG_SECURITY && CONFIG_KEY_NOTIFICATIONS */



#ifdef CONFIG_SECURITY_NETWORK

include/linux/lsm_hooks.h

+5 −0
Original line number Diff line number Diff line
@@ -1446,6 +1446,11 @@ 
 *	@cred: The event-triggerer's credentials

 *	@n: The notification being posted

 *

 * @watch_key:

 *	Check to see if a process is allowed to watch for event notifications

 *	from a key or keyring.

 *	@key: The key to watch.

 *

 * Security hooks for using the eBPF maps and programs functionalities through

 * eBPF syscalls.

 *

include/linux/security.h

+9 −0
Original line number Diff line number Diff line
@@ -1290,6 +1290,15 @@ static inline int security_post_notification(const struct cred *w_cred, 
}

#endif



#if defined(CONFIG_SECURITY) && defined(CONFIG_KEY_NOTIFICATIONS)

int security_watch_key(struct key *key);

#else

static inline int security_watch_key(struct key *key)

{

	return 0;

}

#endif



#ifdef CONFIG_SECURITY_NETWORK



int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk);

security/security.c

+7 −0
Original line number Diff line number Diff line
@@ -2016,6 +2016,13 @@ int security_post_notification(const struct cred *w_cred, 
}

#endif /* CONFIG_WATCH_QUEUE */



#ifdef CONFIG_KEY_NOTIFICATIONS

int security_watch_key(struct key *key)

{

	return call_int_hook(watch_key, 0, key);

}

#endif



#ifdef CONFIG_SECURITY_NETWORK



int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)