linux-kernel - Re: [PATCH v2] net: ping: check minimum size on ICMP header length

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Date:   Mon, 05 Dec 2016 13:36:11 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     keescook@...omium.org
Cc:     netdev@...r.kernel.org, mchong@...gle.com, i@...nker017.me,
        kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
        kaber@...sh.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ping: check minimum size on ICMP header length

From: Kees Cook <keescook@...omium.org>
Date: Mon, 5 Dec 2016 10:34:38 -0800

> Prior to commit c0371da6047a ("put iov_iter into msghdr") in v3.19, there
> was no check that the iovec contained enough bytes for an ICMP header,
> and the read loop would walk across neighboring stack contents. Since the
> iov_iter conversion, bad arguments are noticed, but the returned error is
> EFAULT. Returning EINVAL is a clearer error and also solves the problem
> prior to v3.19.
> 
> This was found using trinity with KASAN on v3.18:
 ...
> CVE-2016-8399
> 
> Reported-by: Qidan He <i@...nker017.me>
> Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
> Cc: stable@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Applied and queued up for -stable, thanks.