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netfilter: xt_recent: check for unsupported user space flags

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Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Tim Gardner 2010-03-17 16:18:56 +01:00 committed by Patrick McHardy
parent 0079c5aee3
commit 606a9a0263
2 changed files with 8 additions and 0 deletions
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3
include/linux/netfilter/xt_recent.h
View file

@ -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;

5
net/netfilter/xt_recent.c
View file

@ -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)