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Message-ID: <20260504181524.GA19200@openwall.com>
Date: Mon, 4 May 2026 20:15:24 +0200
From: Solar Designer <solar@...nwall.com>
To: oss-security@...ts.openwall.com
Cc: Demi Marie Obenour <demiobenour@...il.com>,
Richard Kettlewell <rjk@...raraq.uk>
Subject: Re: CVE-2026-31431: CopyFail: linux local privilege scalation
On Mon, May 04, 2026 at 01:07:25PM -0400, Demi Marie Obenour wrote:
> On 5/4/26 07:28, Richard Kettlewell wrote:
> > On 02/05/2026 23:32, Demi Marie Obenour wrote:
> >> Can you provide benchmarks showing that the accelerator is faster
> >> than the CPU on realistic workloads?
> >
> > The consistent improvements in latency and throughput started around the
> > 2Kbyte block size (10-20%) and improved as blocks grew, with around 50%
> > latency reduction and 150% throughput increase at 250Kbyte blocks (which
> > is close to our message size limit).
> >
> > Obviously this reflects the hardware we are using (which has no AES
> > support in the application cores), outcomes may differ on other targets.
>
> Can you use ChaCha20-Poly1305 or Adiantum instead of AES? That should
> be significantly faster on the CPU
Let's please wind down this sub-thread. I think it is immaterial to the
original discussion whether alternative ciphers are an option in a given
case. In some cases they will be, in others not.
Alexander
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