Messages in this thread Patch in this message | | | Subject | [PATCH 10/11] selinux: Implement the watch_key security hook [ver #7] | From | David Howells <> | Date | Fri, 30 Aug 2019 14:58:40 +0100 |
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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: David Howells <dhowells@redhat.com> ---
security/selinux/hooks.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 74dd46de01b6..a63249ad98ab 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6533,6 +6533,17 @@ 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 = cred_sid(current_cred()); + + return avc_has_perm(&selinux_state, + sid, ksec->sid, SECCLASS_KEY, KEY_NEED_VIEW, NULL); +} +#endif #endif #ifdef CONFIG_SECURITY_INFINIBAND @@ -6965,6 +6976,9 @@ 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
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