netdev - Re: [PATCH] mac80211: Recast pointer for trailing memcpy()

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Message-ID: <202106171229.824139CA76@keescook>
Date:   Thu, 17 Jun 2021 12:30:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     netdev@...r.kernel.org
Cc:     Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] mac80211: Recast pointer for trailing memcpy()

On Wed, Jun 16, 2021 at 09:27:09PM -0700, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy(), memmove(), and memset(), avoid
> intentionally writing across neighboring array fields.
> 
> Give memcpy() a specific source pointer type so it can correctly
> calculate the bounds of the copy.

Hmpf, please ignore this patch; sorry for the noise. This fix got
mis-tested on my end and does not solve the problem I was trying to solve.
I will return with a v2. :)

-- 
Kees Cook