Commit 606a9a02 authored by Tim Gardner's avatar Tim Gardner Committed by Patrick McHardy

netfilter: xt_recent: check for unsupported user space flags

Signed-off-by: default avatarTim Gardner <tim.gardner@canonical.com>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent 0079c5ae
......@@ -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)
......
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