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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 3 Mar 2017 11:12:39 -0800
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Dmitry Vyukov <dvyukov@...gle.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>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: heap out-of-bounds in
 fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone

On 3/3/17 6:39 AM, Dmitry Vyukov wrote:
> I am getting heap out-of-bounds reports in
> fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone while running
> syzkaller fuzzer on 86292b33d4b79ee03e2f43ea0381ef85f077c760. They all
> follow the same pattern: an object of size 216 is allocated from
> ip_dst_cache slab, and then accessed at offset 272/276 withing
> fib6_walk. Looks like type confusion. Unfortunately this is not
> reproducible.

I'll take a look this weekend or Monday at the latest.