@@ -1445,6 +1445,12 @@
* from devices (as a global set).
* @watch: The watch object
*
+ * @post_notification:
+ * Check to see if a watch notification can be posted to a particular
+ * queue.
+ * @q_cred: The credentials of the target watch queue.
+ * @cred: The event-triggerer's credentials
+ * @n: The notification being posted
*
* Security hooks for using the eBPF maps and programs functionalities through
* eBPF syscalls.
@@ -1729,6 +1735,9 @@ union security_list_options {
int (*watch_sb)(struct watch *watch, struct super_block *sb);
int (*watch_key)(struct watch *watch, struct key *key);
int (*watch_devices)(struct watch *watch);
+ int (*post_notification)(const struct cred *q_cred,
+ const struct cred *cred,
+ struct watch_notification *n);
#endif /* CONFIG_WATCH_QUEUE */
#ifdef CONFIG_SECURITY_NETWORK
@@ -2014,6 +2023,7 @@ struct security_hook_heads {
struct hlist_head watch_sb;
struct hlist_head watch_key;
struct hlist_head watch_devices;
+ struct hlist_head post_notification;
#endif /* CONFIG_WATCH_QUEUE */
#ifdef CONFIG_SECURITY_NETWORK
struct hlist_head unix_stream_connect;
@@ -59,6 +59,7 @@ struct fs_parameter;
enum fs_value_type;
struct fsinfo_kparams;
struct watch;
+struct watch_notification;
/* Default (no) options for the capable function */
#define CAP_OPT_NONE 0x0
@@ -402,6 +403,9 @@ int security_watch_mount(struct watch *watch, struct path *path);
int security_watch_sb(struct watch *watch, struct super_block *sb);
int security_watch_key(struct watch *watch, struct key *key);
int security_watch_devices(struct watch *watch);
+int security_post_notification(const struct cred *q_cred,
+ const struct cred *cred,
+ struct watch_notification *n);
#endif /* CONFIG_WATCH_QUEUE */
#else /* CONFIG_SECURITY */
@@ -1239,6 +1243,12 @@ static inline int security_watch_devices(struct watch *watch)
{
return 0;
}
+static inline int security_post_notification(const struct cred *q_cred,
+ const struct cred *cred,
+ struct watch_notification *n)
+{
+ return 0;
+}
#endif /* CONFIG_WATCH_QUEUE */
#endif /* CONFIG_SECURITY */
@@ -1950,6 +1950,12 @@ int security_watch_devices(struct watch *watch)
return call_int_hook(watch_devices, 0, watch);
}
+int security_post_notification(const struct cred *q_cred,
+ const struct cred *cred,
+ struct watch_notification *n)
+{
+ return call_int_hook(post_notification, 0, q_cred, cred, n);
+}
#endif /* CONFIG_WATCH_QUEUE */
#ifdef CONFIG_SECURITY_NETWORK
Add a security hook that allows an LSM to rule on whether a notification message is allowed to be inserted into a particular watch queue. The hook is given the following information: (1) The credentials of the triggerer (which may be init_cred for a system notification, eg. a hardware error). (2) The credentials of the creator of the watch buffer. (3) The notification message. Signed-off-by: David Howells <dhowells@redhat.com> cc: Casey Schaufler <casey@schaufler-ca.com> cc: Stephen Smalley <sds@tycho.nsa.gov> cc: linux-security-module@vger.kernel.org --- include/linux/lsm_hooks.h | 10 ++++++++++ include/linux/security.h | 10 ++++++++++ security/security.c | 6 ++++++ 3 files changed, 26 insertions(+)