This is a note to let you know that I've just added the patch titled

netfilter: bridge: ebt_among: add more missing match size checks

to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: netfilter-bridge-ebt_among-add-more-missing-match-size-checks.patch and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From c8d70a700a5b486bfa8e5a7d33d805389f6e59f9 Mon Sep 17 00:00:00 2001

From: Florian Westphal fw@strlen.de Date: Fri, 9 Mar 2018 14:27:31 +0100 Subject: netfilter: bridge: ebt_among: add more missing match size checks

From: Florian Westphal fw@strlen.de

commit c8d70a700a5b486bfa8e5a7d33d805389f6e59f9 upstream.

ebt_among is special, it has a dynamic match size and is exempt from the central size checks.

commit c4585a2823edf ("bridge: ebt_among: add missing match size checks") added validation for pool size, but missed fact that the macros ebt_among_wh_src/dst can already return out-of-bound result because they do not check value of wh_src/dst_ofs (an offset) vs. the size of the match that userspace gave to us.

v2: check that offset has correct alignment. Paolo Abeni points out that we should also check that src/dst wormhash arrays do not overlap, and src + length lines up with start of dst (or vice versa). v3: compact wormhash_sizes_valid() part

NB: Fixes tag is intentionally wrong, this bug exists from day one when match was added for 2.6 kernel. Tag is there so stable maintainers will notice this one too.

Tested with same rules from the earlier patch.

Fixes: c4585a2823edf ("bridge: ebt_among: add missing match size checks") Reported-by: syzbot+bdabab6f1983a03fc009@syzkaller.appspotmail.com Signed-off-by: Florian Westphal fw@strlen.de Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- net/bridge/netfilter/ebt_among.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)

--- a/net/bridge/netfilter/ebt_among.c +++ b/net/bridge/netfilter/ebt_among.c @@ -177,6 +177,28 @@ static bool poolsize_invalid(const struc return w && w->poolsize >= (INT_MAX / sizeof(struct ebt_mac_wormhash_tuple)); }

+static bool wormhash_offset_invalid(int off, unsigned int len) +{ + if (off == 0) /* not present */ + return false; + + if (off < (int)sizeof(struct ebt_among_info) || + off % __alignof__(struct ebt_mac_wormhash)) + return true; + + off += sizeof(struct ebt_mac_wormhash); + + return off > len; +} + +static bool wormhash_sizes_valid(const struct ebt_mac_wormhash *wh, int a, int b) +{ + if (a == 0) + a = sizeof(struct ebt_among_info); + + return ebt_mac_wormhash_size(wh) + a == b; +} + static int ebt_among_mt_check(const struct xt_mtchk_param *par) { const struct ebt_among_info *info = par->matchinfo; @@ -189,6 +211,10 @@ static int ebt_among_mt_check(const stru if (expected_length > em->match_size) return -EINVAL;

+ if (wormhash_offset_invalid(info->wh_dst_ofs, em->match_size) || + wormhash_offset_invalid(info->wh_src_ofs, em->match_size)) + return -EINVAL; + wh_dst = ebt_among_wh_dst(info); if (poolsize_invalid(wh_dst)) return -EINVAL; @@ -201,6 +227,14 @@ static int ebt_among_mt_check(const stru if (poolsize_invalid(wh_src)) return -EINVAL;

+ if (info->wh_src_ofs < info->wh_dst_ofs) { + if (!wormhash_sizes_valid(wh_src, info->wh_src_ofs, info->wh_dst_ofs)) + return -EINVAL; + } else { + if (!wormhash_sizes_valid(wh_dst, info->wh_dst_ofs, info->wh_src_ofs)) + return -EINVAL; + } + expected_length += ebt_mac_wormhash_size(wh_src);

if (em->match_size != EBT_ALIGN(expected_length)) {

Patches currently in stable-queue which might be from fw@strlen.de are

queue-3.18/netfilter-x_tables-add-and-use-xt_check_proc_name.patch queue-3.18/xfrm_user-uncoditionally-validate-esn-replay-attribute-struct.patch queue-3.18/netfilter-bridge-ebt_among-add-more-missing-match-size-checks.patch