netdev - Re: net: heap out-of-bounds in fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune

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Date:   Thu, 20 Apr 2017 18:09:38 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: heap out-of-bounds in fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone

On Thu, Apr 20, 2017 at 5:39 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> On Thu, Apr 20, 2017 at 5:35 PM, David Ahern <dsa@...ulusnetworks.com> wrote:
>> On 4/20/17 9:28 AM, Andrey Konovalov wrote:
>>> This one seems to be much closer to what Dmitry reported intially.
>>
>> does not repro here; I ran in a loop and nothing.

Here's strace log, maybe it'll help figuring out why it doesn't reproduce:

# strace ./a.out
...
socket(PF_INET6, SOCK_RAW, IPPROTO_TCP) = 3
ioctl(3, SIOCSIFFLAGS, {ifr_name="lo",
ifr_flags=IFF_UP|IFF_PROMISC|IFF_ALLMULTI|0xffff8000}) = 0
socket(PF_INET6, SOCK_RAW|SOCK_CLOEXEC, 0x2b /* IPPROTO_??? */) = 4
socket(PF_INET6, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
ioctl(5, SIOCGIFINDEX, {ifr_name="ip6_vti0", ifr_index=26}) = 0
ioctl(4, SIOCSIFADDR, {ifr_name="?", ifr_addr={AF_X25,
"\0\0\32\0\0\0\254*b\333\263\177\0\0"}}) = 0
socket(PF_INET6, SOCK_STREAM|SOCK_NONBLOCK, 0x84 /* IPPROTO_??? */) = 6
ioctl(6, SIOCSIFFLAGS, {ifr_name="lo", ifr_flags=0xffff8000 /* IFF_??? */}) = 0
socket(PF_INET6, SOCK_RAW, 0x3 /* IPPROTO_??? */) = 7
ioctl(7, SIOCSIFFLAGS, {ifr_name="ip6_vti0",
ifr_flags=IFF_UP|IFF_PROMISC|IFF_ALLMULTI|0xffff8000}) = 0
ioctl(3, SIOCSIFFLAGS, {ifr_name="lo",
ifr_flags=IFF_UP|IFF_PROMISC|IFF_ALLMULTI|0xffff8000}) = 0
ioctl(6, SIOCSIFFLAGS, {ifr_name="lo", ifr_flags=0xffff8000 /* IFF_??? */}) = 0
exit_group(0)                           = ?

>
> You use the attached config, right?
>
>>
>> can you send output of "sysctl -a --pattern 'net.ipv6'"
>
> Uploaded here:
> https://gist.github.com/xairy/7b6988c9cd8fda5458005df05584ff27