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

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Message-ID: <798f0911-5c54-ebe0-9d44-64bec0c96a72@igalia.com>
Date:   Mon, 17 Oct 2022 15:22:48 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Ard Biesheuvel <ardb@...nel.org>, Kees Cook <keescook@...omium.org>
Cc:     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 17/10/2022 15:14, Ard Biesheuvel wrote:
> [...]
> 
> So at that point, I wondered what the point is of all this complexity.
> Do we really need 6 different algorithms to compress a couple of K of
> ASCII text on a code path that is ice cold by definition? Wouldn't it
> be better to drop the crypto API altogether here, and just use GZIP
> via the library interface?

Skipping all the interesting and more complex parts, I'd just want to
consider zstd maybe? Quite fast and efficient - it's what we're using by
default on Steam Deck.

I'm not sure what is the gzip library interface - you mean skipping the
scomp/legacy comp interface, and make use directly of gzip?

Cheers,


Guilherme