linux-kernel - Re: [PATCH] sh: Replace all non-returning strlcpy with strscpy

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Message-ID: <202306141203.0CAB93DD13@keescook>
Date:   Wed, 14 Jun 2023 12:03:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     ysato@...rs.sourceforge.jp, azeemshaikh38@...il.com,
        dalias@...c.org, linux-kernel@...r.kernel.org,
        rdunlap@...radead.org, linux-sh@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] sh: Replace all non-returning strlcpy with strscpy

On Wed, Jun 14, 2023 at 08:49:13PM +0200, John Paul Adrian Glaubitz wrote:
> Hi Kees!
> 
> On Wed, 2023-06-14 at 11:44 -0700, Kees Cook wrote:
> > On Tue, 30 May 2023 16:30:41 +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().
> > > No return values were used, so direct replacement is safe.
> > > 
> > > [...]
> > 
> > Build tested with sh4 GCC 13.1 from:
> > https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/13.1.0/
> > 
> > with defconfig and:
> > 	CONFIG_CPU_SUBTYPE_SH7343=y
> > 	CONFIG_SH_DMA=y
> > 	CONFIG_SH_DMA_API=y
> > 
> > Applied to for-next/hardening, thanks!
> > 
> > [1/1] sh: Replace all non-returning strlcpy with strscpy
> >       https://git.kernel.org/kees/c/ca64da3052be
> > 
> 
> Apologies, this fell off my table. I should have acked and tested this being the
> SuperH maintainer. If you can still update the patch in your tree, I can both
> test and ack this patch.

Absolutely! Thanks for double-checking. :)

-Kees

-- 
Kees Cook