apparmor: add parameter to control whether policy hashing is used

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>

security/apparmor/policy_unpack.c

@@ -775,8 +775,9 @@ int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns)
 		if (error)
 			goto fail_profile;
 
-		error = aa_calc_profile_hash(profile, e.version, start,
-					     e.pos - start);
+		if (aa_g_hash_policy)
+			error = aa_calc_profile_hash(profile, e.version, start,
+						     e.pos - start);
 		if (error)
 			goto fail_profile;