linux-hardening - Re: [PATCH v3 1/2] lib: introduce simple error-checking wrapper for memparse()

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Message-ID: <202601080954.272AAE6217@keescook>
Date: Thu, 8 Jan 2026 09:55:27 -0800
From: Kees Cook <kees@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dmitry Antipov <dmantipov@...dex.ru>, Carlos Maiolino <cem@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Shevchenko <andy@...nel.org>, linux-xfs@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 1/2] lib: introduce simple error-checking wrapper for
 memparse()

On Thu, Jan 08, 2026 at 09:42:42AM -0800, Andrew Morton wrote:
> On Thu, 8 Jan 2026 09:06:49 -0800 Kees Cook <kees@...nel.org> wrote:
> 
> > On Thu, Jan 08, 2026 at 07:52:15PM +0300, Dmitry Antipov wrote:
> > > Introduce 'memvalue()' which uses 'memparse()' to parse a string
> > > with optional memory suffix into a non-negative number. If parsing
> > > has succeeded, returns 0 and stores the result at the location
> > > specified by the second argument. Otherwise returns -EINVAL and
> > > leaves the location untouched.
> > > 
> > > Suggested-by: Christoph Hellwig <hch@...radead.org>
> > > Suggested-by: Kees Cook <kees@...nel.org>
> > > Signed-off-by: Dmitry Antipov <dmantipov@...dex.ru>
> > 
> > LGTM, thanks!
> > 
> > Reviewed-by: Kees Cook <kees@...nel.org>
> 
> Thanks, I'll add both these to mm.git's mm-nonmm-unstable branch for
> testing.
> 
> If XFS people would prefer to take [2/2] via the xfs tree then please
> lmk and I'll send it over when [1/2] is upstreamed.  Or we can take
> both patches via the xfs tree.  Or something.  Sending out an acked-by:
> would be simplest!

I assumed this would go via xfs tree, but I'm happy to do whatever.

-- 
Kees Cook