perf/core: Call LSM hook after copying perf_event_attr

It passes the attr struct to the security_perf_event_open() but it's
not initialized yet.

Fixes: da97e18 ("perf_event: Add support for LSM and SELinux checks")
Signed-off-by: Namhyung Kim <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Joel Fernandes (Google) <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

Author: namhyung

kernel/events/core.c

@@ -12321,12 +12321,12 @@ SYSCALL_DEFINE5(perf_event_open,
 	if (flags & ~PERF_FLAG_ALL)
 		return -EINVAL;
 
-	/* Do we allow access to perf_event_open(2) ? */
-	err = security_perf_event_open(&attr, PERF_SECURITY_OPEN);
+	err = perf_copy_attr(attr_uptr, &attr);
 	if (err)
 		return err;
 
-	err = perf_copy_attr(attr_uptr, &attr);
+	/* Do we allow access to perf_event_open(2) ? */
+	err = security_perf_event_open(&attr, PERF_SECURITY_OPEN);
 	if (err)
 		return err;