Commit 3e412ccc authored by David Howells's avatar David Howells
Browse files

selinux: Implement the watch_key security hook 



Implement the watch_key security hook to make sure that a key grants the
caller View permission in order to set a watch on a key.

For the moment, the watch_devices security hook is left unimplemented as
it's not obvious what the object should be since the queue is global and
didn't previously exist.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: default avatarJames Morris <jamorris@linux.microsoft.com>
parent 8c0637e9

security/selinux/hooks.c

+14 −0
Original line number Diff line number Diff line
@@ -6619,6 +6619,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer) 
	*_buffer = context;

	return rc;

}



#ifdef CONFIG_KEY_NOTIFICATIONS

static int selinux_watch_key(struct key *key)

{

	struct key_security_struct *ksec = key->security;

	u32 sid = current_sid();



	return avc_has_perm(&selinux_state,

			    sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);

}

#endif

#endif



#ifdef CONFIG_SECURITY_INFINIBAND
@@ -7134,6 +7145,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { 
	LSM_HOOK_INIT(key_free, selinux_key_free),

	LSM_HOOK_INIT(key_permission, selinux_key_permission),

	LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),

#ifdef CONFIG_KEY_NOTIFICATIONS

	LSM_HOOK_INIT(watch_key, selinux_watch_key),

#endif

#endif



#ifdef CONFIG_AUDIT