netfilter: xt_recent: check for unsupported user space flags
Signed-off-by: Tim Gardner <tim.gardner@canonical.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
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@ -20,6 +20,9 @@ enum {
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/* Only allowed with --rcheck and --update */
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#define XT_RECENT_MODIFIERS (XT_RECENT_TTL|XT_RECENT_REAP)
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#define XT_RECENT_VALID_FLAGS (XT_RECENT_CHECK|XT_RECENT_SET|XT_RECENT_UPDATE|\
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XT_RECENT_REMOVE|XT_RECENT_TTL|XT_RECENT_REAP)
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struct xt_recent_mtinfo {
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__u32 seconds;
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__u32 hit_count;
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@ -319,6 +319,11 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
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get_random_bytes(&hash_rnd, sizeof(hash_rnd));
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hash_rnd_inited = true;
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}
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if (info->check_set & ~XT_RECENT_VALID_FLAGS) {
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pr_info(KBUILD_MODNAME ": Unsupported user space flags "
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"(%08x)\n", info->check_set);
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return false;
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}
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if (hweight8(info->check_set &
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(XT_RECENT_SET | XT_RECENT_REMOVE |
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XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
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