@@ -20,6 +20,9 @@ enum {
/* Only allowed with --rcheck and --update */
#define XT_RECENT_MODIFIERS (XT_RECENT_TTL|XT_RECENT_REAP)
+#define XT_RECENT_VALID_FLAGS (XT_RECENT_CHECK|XT_RECENT_SET|XT_RECENT_UPDATE|\
+ XT_RECENT_REMOVE|XT_RECENT_TTL|XT_RECENT_REAP)
+
struct xt_recent_mtinfo {
__u32 seconds;
__u32 hit_count;
@@ -319,6 +319,11 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
get_random_bytes(&hash_rnd, sizeof(hash_rnd));
hash_rnd_inited = true;
}
+ if (info->check_set & ~XT_RECENT_VALID_FLAGS) {
+ pr_info(KBUILD_MODNAME ": Unsupported user space flags "
+ "(%08x)\n", info->check_set);
+ return false;
+ }
if (hweight8(info->check_set &
(XT_RECENT_SET | XT_RECENT_REMOVE |
XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)