lsm: move the perf hook comments to security/security.c

This patch relocates the LSM hook function comments to the function
definitions, in keeping with the current kernel conventions.  This
should make the hook descriptions more easily discoverable and easier
to maintain.

While formatting changes have been done to better fit the kernel-doc
style, content changes have been kept to a minimum and limited to
text which was obviously incorrect and/or outdated.  It is expected
the future patches will improve the quality of the function header
comments.

Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Author: pcmoore

include/linux/lsm_hooks.h

@@ -196,23 +196,6 @@
  *	@what: kernel feature being accessed.
  *	Return 0 if permission is granted.
  *
- * Security hooks for perf events
- *
- * @perf_event_open:
- *	Check whether the @type of perf_event_open syscall is allowed.
- *	Return 0 if permission is granted.
- * @perf_event_alloc:
- *	Allocate and save perf_event security info.
- *	Return 0 on success, error on failure.
- * @perf_event_free:
- *	Release (free) perf_event security info.
- * @perf_event_read:
- *	Read perf_event security info if allowed.
- *	Return 0 if permission is granted.
- * @perf_event_write:
- *	Write perf_event security info if allowed.
- *	Return 0 if permission is granted.
- *
  * Security hooks for io_uring
  *
  * @uring_override_creds:

security/security.c

@@ -4927,26 +4927,65 @@ int security_locked_down(enum lockdown_reason what)
 EXPORT_SYMBOL(security_locked_down);
 
 #ifdef CONFIG_PERF_EVENTS
+/**
+ * security_perf_event_open() - Check if a perf event open is allowed
+ * @attr: perf event attribute
+ * @type: type of event
+ *
+ * Check whether the @type of perf_event_open syscall is allowed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
 int security_perf_event_open(struct perf_event_attr *attr, int type)
 {
 	return call_int_hook(perf_event_open, 0, attr, type);
 }
 
+/**
+ * security_perf_event_alloc() - Allocate a perf event LSM blob
+ * @event: perf event
+ *
+ * Allocate and save perf_event security info.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
 int security_perf_event_alloc(struct perf_event *event)
 {
 	return call_int_hook(perf_event_alloc, 0, event);
 }
 
+/**
+ * security_perf_event_free() - Free a perf event LSM blob
+ * @event: perf event
+ *
+ * Release (free) perf_event security info.
+ */
 void security_perf_event_free(struct perf_event *event)
 {
 	call_void_hook(perf_event_free, event);
 }
 
+/**
+ * security_perf_event_read() - Check if reading a perf event label is allowed
+ * @event: perf event
+ *
+ * Read perf_event security info if allowed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
 int security_perf_event_read(struct perf_event *event)
 {
 	return call_int_hook(perf_event_read, 0, event);
 }
 
+/**
+ * security_perf_event_write() - Check if writing a perf event label is allowed
+ * @event: perf event
+ *
+ * Write perf_event security info if allowed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
 int security_perf_event_write(struct perf_event *event)
 {
 	return call_int_hook(perf_event_write, 0, event);