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netfilter: ebtables: reject non-bridge targets 

the ebtables evaluation loop expects targets to return
positive values (jumps), or negative values (absolute verdicts).

This is completely different from what xtables does.
In xtables, targets are expected to return the standard netfilter
verdicts, i.e. NF_DROP, NF_ACCEPT, etc.

ebtables will consider these as jumps.

Therefore reject any target found due to unspec fallback.
v2: also reject watchers.  ebtables ignores their return value, so
a target that assumes skb ownership (and returns NF_STOLEN) causes
use-after-free.

The only watchers in the 'ebtables' front-end are log and nflog;
both have AF_BRIDGE specific wrappers on kernel side.

Reported-by: syzbot+2b43f681169a2a0d306a@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-06-06 12:14:56 +02:00 committed by Pablo Neira Ayuso
parent 9e8c8dabb7
commit 11ff7288be
1 changed files with 13 additions and 0 deletions
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13
net/bridge/netfilter/ebtables.c
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@ -396,6 +396,12 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct xt_tgchk_param *par,
watcher = xt_request_find_target(NFPROTO_BRIDGE, w->u.name, 0);
if (IS_ERR(watcher))
return PTR_ERR(watcher);
if (watcher->family != NFPROTO_BRIDGE) {
module_put(watcher->me);
return -ENOENT;
}
w->u.watcher = watcher;
par->target = watcher;
@ -715,6 +721,13 @@ ebt_check_entry(struct ebt_entry *e, struct net *net,
goto cleanup_watchers;
}
/* Reject UNSPEC, xtables verdicts/return values are incompatible */
if (target->family != NFPROTO_BRIDGE) {
module_put(target->me);
ret = -ENOENT;
goto cleanup_watchers;
}
t->u.target = target;
if (t->u.target == &ebt_standard_target) {
if (gap < sizeof(struct ebt_standard_target)) {