linux-hardening - Re: [PATCH] pstore: migrate to crypto acomp interface (take 2)

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Message-ID: <202210171100.5BAC4A5CC8@keescook>
Date:   Mon, 17 Oct 2022 11:01:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] pstore: migrate to crypto acomp interface (take 2)

On Mon, Oct 17, 2022 at 01:26:12PM -0300, Guilherme G. Piccoli wrote:
> On 06/10/2022 20:41, Kees Cook wrote:
> > From: Ard Biesheuvel <ardb@...nel.org>
> > 
> > The crypto 'compress' interface is deprecated, so before adding new
> > features, migrate to the acomp interface. Note that we are only using
> > synchronous implementations of acomp, so we don't have to deal with
> > asynchronous completion.

Ard, given your observation about all the per-cpu memory allocation,
should pstore still go ahead with this conversion?

-Kees

> > 
> > [ Tweaked error paths to avoid memory leak, as pointed out byGuilherme
> >   G. Piccoli <gpiccoli@...lia.com>, and fixed pstore_compress()
> >   return value -kees ]
> > 
> > Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> > Link: https://lore.kernel.org/lkml/CAMj1kXFnoqj+cn-0dT8fg0kgLvVx+Q2Ex-4CUjSnA9yRprmC-w@mail.gmail.com/
> > Cc: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> >  fs/pstore/platform.c | 74 ++++++++++++++++++++++++++++++++++----------
> >  1 file changed, 57 insertions(+), 17 deletions(-)
> > 
> 
> Hi Kees, thanks for re-sending this one.
> 
> Just tested it on top of v6.0, with efi-pstore/ramoops, using zstd, lz4
> and deflate - everything working as expected.
> So, with the typo fixed, have my:
> 
> Tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com>

Thanks!

-- 
Kees Cook