From: Kees Cook <keescook@chromium.org>
To: Azeem Shaikh <azeemshaikh38@gmail.com>
Cc: Felix Fietkau <nbd@nbd.name>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Ryder Lee <ryder.lee@mediatek.com>,
linux-hardening@vger.kernel.org,
Shayne Chen <shayne.chen@mediatek.com>,
Sean Wang <sean.wang@mediatek.com>,
linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
Kalle Valo <kvalo@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org
Subject: Re: [PATCH] wifi: mt76: Replace strlcpy with strscpy
Date: Thu, 27 Jul 2023 10:02:28 -0700 [thread overview]
Message-ID: <202307271001.13EA5FB@keescook> (raw)
In-Reply-To: <CADmuW3UY=w0p-h1h4qOord7z1nFnvpyCOU3fcCaATm_PvFFUeA@mail.gmail.com>
On Tue, Jul 18, 2023 at 12:38:37AM -0400, Azeem Shaikh wrote:
> On Wed, Jul 12, 2023 at 7:54 PM Kees Cook <keescook@chromium.org> wrote:
> >
> > On Mon, Jul 03, 2023 at 06:12:56PM +0000, Azeem Shaikh wrote:
> > > strlcpy() reads the entire source buffer first.
> > > This read may exceed the destination size limit.
> > > This is both inefficient and can lead to linear read
> > > overflows if a source string is not NUL-terminated [1].
> > > In an effort to remove strlcpy() completely [2], replace
> > > strlcpy() here with strscpy().
> > >
> > > Direct replacement is safe here since DEV_ASSIGN is only used by
> > > TRACE macros and the return values are ignored.
> > >
> > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> > > [2] https://github.com/KSPP/linux/issues/89
> > >
> > > Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
> >
> > Looks good -- thing is using return values from the macros.
>
> Just to confirm, you mean *not* using return values from the macros?
I thought I'd replied to this, but I see it didn't happen: yes, I meant
"not using return values". Sorry for the confusion!
--
Kees Cook
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next prev parent reply other threads:[~2023-07-27 17:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-03 18:12 [PATCH] wifi: mt76: Replace strlcpy with strscpy Azeem Shaikh
2023-07-12 23:54 ` Kees Cook
2023-07-18 4:38 ` Azeem Shaikh
2023-07-27 17:02 ` Kees Cook [this message]
2023-07-27 15:52 ` Kees Cook
2023-07-27 16:00 ` Kalle Valo
2023-07-27 17:01 ` Kees Cook
2023-08-01 9:07 ` Kalle Valo
2023-08-02 10:09 ` wifi: mt76: Replace strlcpy() with strscpy() Kalle Valo
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