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Date: Tue, 23 Jun 2026 18:05:02 +0000
From: Eric Biggers <ebiggers@kernel.org>
To: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc: linux-crypto@vger.kernel.org, Herbert Xu <herbert@gondor.apana.org.au>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-bluetooth@vger.kernel.org, iwd@lists.linux.dev,
	linux-hardening@vger.kernel.org, Milan Broz <gmazyland@gmail.com>,
	Demi Marie Obenour <demiobenour@gmail.com>,
	Andy Lutomirski <luto@amacapital.net>
Subject: Re: [PATCH] crypto: af_alg - Add af_alg_restrict sysctl, defaulting
 to 1
Message-ID: <20260623180502.GC1850517@google.com>
References: <20260622234803.6982-1-ebiggers@kernel.org>
 <CABBYNZ+QLvkYkn_EcBZ4+GopyhKqJLcfCoABYcw1VamavbSvhg@mail.gmail.com>
 <20260623165208.GB1793@sol>
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In-Reply-To: <20260623165208.GB1793@sol>

On Tue, Jun 23, 2026 at 09:52:08AM -0700, Eric Biggers wrote:
> On Tue, Jun 23, 2026 at 11:04:14AM -0400, Luiz Augusto von Dentz wrote:
> > > +===  ==================================================================
> > > +0    AF_ALG is unrestricted.
> > > +
> > > +1    AF_ALG is supported with a limited list of algorithms. The list
> > > +     is designed for compatibility with known users such as iwd and
> > > +     bluez that haven't yet been fixed to use userspace crypto code.
> > 
> > Is the expectation that we go shopping for userspace crypto here?
> 
> Yes, same as what 99% of userspace already does.  Probably you'll just
> want to link to OpenSSL, but it could be something else if you want.
> 
> - Eric

By the way you do know that bluez already has a local implementation of
ECDH, right?  See src/shared/ecc.c.

- Eric