linux-hardening - Re: [PATCH] net/mediatek: strlcpy withreturn

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Date:   Tue, 13 Jun 2023 10:11:26 -0400
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Jakub Kicinski <kuba@...nel.org>, linux-hardening@...r.kernel.org,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] net/mediatek: strlcpy withreturn

On Tue, Jun 13, 2023 at 4:35 AM Kalle Valo <kvalo@...nel.org> wrote:
>
> Azeem Shaikh <azeemshaikh38@...il.com> 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@...il.com>
>
> The title should be:
>
> wifi: mt7601u: replace strlcpy() with strscpy()
>
> I can fix that, no need to resend because of this.
>

Thanks Kalle!

> --
> https://patchwork.kernel.org/project/linux-wireless/patch/20230613003458.3538812-1-azeemshaikh38@gmail.com/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
>