linux-kernel - Re: [PATCH] net: check passed optlen before reading

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Message-ID: <CA+FuTSeDTJxbPvN6hkXFMaBspVHwL+crOxzC2ukWRzxvKma9bA@mail.gmail.com>
Date:   Wed, 29 Dec 2021 10:08:40 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Tamir Duberstein <tamird@...il.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: check passed optlen before reading

On Tue, Dec 28, 2021 at 6:54 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 28 Dec 2021 16:02:29 -0500 Tamir Duberstein wrote:
> > Errant brace in the earlier version.
> >
> > From 8586be4d72c6c583b1085d2239076987e1b7c43a Mon Sep 17 00:00:00 2001
> > From: Tamir Duberstein <tamird@...il.com>
> > Date: Tue, 28 Dec 2021 15:09:11 -0500
> > Subject: [PATCH v2] net: check passed optlen before reading
> >
> > Add a check that the user-provided option is at least as long as the
> > number of bytes we intend to read. Before this patch we would blindly
> > read sizeof(int) bytes even in cases where the user passed
> > optlen<sizeof(int), which would potentially read garbage or fault.
> >
> > Discovered by new tests in https://github.com/google/gvisor/pull/6957 .
> >
> > Signed-off-by: Tamir Duberstein <tamird@...il.com>
>
> Your patches are corrupted by your email client.
>
> Can you try sending the latest version with git send-email?

Then perhaps also update the subject line to make it more clear where
this applies: "ipv6: raw: check passed optlen before reading".