Re: CVE-2026-31431: CopyFail: linux local privilege scalation

[Solar Designer <solar () openwall com>]

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