netdev - Re: [PATCH net v2 1/3] netfilter: synproxy: Fix out of bounds when parsing TCP options

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Date:   Thu, 10 Jun 2021 18:43:52 +0200
From:   Florian Westphal <fw@...len.de>
To:     Maxim Mikityanskiy <maximmi@...dia.com>
Cc:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Patrick McHardy <kaber@...sh.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Christoph Paasch <cpaasch@...le.com>,
        Peter Krystad <peter.krystad@...ux.intel.com>,
        Young Xiao <92siuyang@...il.com>, netdev@...r.kernel.org,
        mptcp@...ts.linux.dev
Subject: Re: [PATCH net v2 1/3] netfilter: synproxy: Fix out of bounds when
 parsing TCP options

Maxim Mikityanskiy <maximmi@...dia.com> wrote:
> The TCP option parser in synproxy (synproxy_parse_options) could read
> one byte out of bounds. When the length is 1, the execution flow gets
> into the loop, reads one byte of the opcode, and if the opcode is
> neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds
> the length of 1.
> 
> This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack
> out of bounds when parsing TCP options.").

Reviewed-by: Florian Westphal <fw@...len.de>