linux-kernel - Re: net/netlink: another global-out-of-bounds in genl_family_rcv_msg/validate

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Date:   Thu, 3 Nov 2016 16:22:35 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Matti Vaittinen <matti.vaittinen@...ia.com>,
        Tycho Andersen <tycho.andersen@...onical.com>,
        stephen hemminger <stephen@...workplumber.org>,
        Tom Herbert <tom@...bertland.com>,
        Florian Westphal <fw@...len.de>,
        netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/netlink: another global-out-of-bounds in genl_family_rcv_msg/validate_nla

On Thu, Nov 3, 2016 at 4:04 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> Hi,
>
> I've got the following error report while running the syzkaller fuzzer:
>
> BUG: KASAN: global-out-of-bounds in validate_nla+0x49b/0x4e0 at addr
> ffffffff84452de0
> Read of size 2 by task syz-executor/19055
> Address belongs to variable ip_vs_cmd_policy+0x20/0x40

LOL, seems a typo

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index c3c809b..a6e44ef 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2845,7 +2845,7 @@ static struct genl_family ip_vs_genl_family = {
        .hdrsize        = 0,
        .name           = IPVS_GENL_NAME,
        .version        = IPVS_GENL_VERSION,
-       .maxattr        = IPVS_CMD_MAX,
+       .maxattr        = IPVS_CMD_ATTR_MAX,
        .netnsok        = true,         /* Make ipvsadm to work on netns */
 };