From: Mat Martineau <mathew.j.martineau@linux.intel.com>
To: Maxim Mikityanskiy <maximmi@nvidia.com>
Cc: Matthieu Baerts <matthieu.baerts@tessares.net>, mptcp@lists.linux.dev
Subject: Re: [PATCH net v2 2/3] mptcp: Fix out of bounds when parsing TCP options
Date: Thu, 10 Jun 2021 14:09:43 -0700 (PDT) [thread overview]
Message-ID: <4fee0cc-6928-2ae6-fa1d-134f5787cbe@linux.intel.com> (raw)
In-Reply-To: <82474768-2c86-b2b7-afeb-30618b2ce094@linux.intel.com>
On Thu, 10 Jun 2021, Mat Martineau wrote:
> On Thu, 10 Jun 2021, Maxim Mikityanskiy wrote:
>
>> The TCP option parser in mptcp (mptcp_get_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.").
>>
>> Cc: Young Xiao <92siuyang@gmail.com>
>> Fixes: cec37a6e41aa ("mptcp: Handle MP_CAPABLE options for outgoing
>> connections")
>> Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
>> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
>> ---
>> net/mptcp/options.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/net/mptcp/options.c b/net/mptcp/options.c
>> index 6b825fb3fa83..9b263f27ce9b 100644
>> --- a/net/mptcp/options.c
>> +++ b/net/mptcp/options.c
>> @@ -356,6 +356,8 @@ void mptcp_get_options(const struct sk_buff *skb,
>> length--;
>> continue;
>> default:
>> + if (length < 2)
>> + return;
>> opsize = *ptr++;
>> if (opsize < 2) /* "silly options" */
>> return;
>> --
>> 2.25.1
>
> Matthieu -
>
> Could you apply this in mptcp_net-next so it's easier to track when the patch
> finds its way to net-next?
>
> (MPTCP patchwork status set to "queued")
And to clarify for Maxim: we have a separate MPTCP git tree where we stage
MPTCP changes before submitting to net- or net-next. For your patch set
that has related changes across a few networking subsystems, sending
directly to netdev is the best thing to do.
We do have other queued changes for netdev so I think it would work well
to include this patch in our tree now, and it will automatically disappear
once it is fully merged upstream. Sometimes it takes a couple of weeks for
the net/master branch to get merged in to net-next/master.
--
Mat Martineau
Intel
next prev parent reply other threads:[~2021-06-10 21:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 16:40 [PATCH net v2 0/3] Fix out of bounds when parsing TCP options Maxim Mikityanskiy
2021-06-10 16:40 ` [PATCH net v2 1/3] netfilter: synproxy: " Maxim Mikityanskiy
2021-06-10 16:43 ` Florian Westphal
2021-06-10 16:40 ` [PATCH net v2 2/3] mptcp: " Maxim Mikityanskiy
2021-06-10 21:03 ` Mat Martineau
2021-06-10 21:09 ` Mat Martineau [this message]
2021-06-11 14:30 ` Matthieu Baerts
2021-06-10 16:40 ` [PATCH net v2 3/3] sch_cake: Fix out of bounds when parsing TCP options and header Maxim Mikityanskiy
2021-06-10 21:50 ` [PATCH net v2 0/3] Fix out of bounds when parsing TCP options patchwork-bot+netdevbpf
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