Re: [PATCH 0/2] wireguard-linux-compat: grsecurity compat patches

[Aymeric Fromherz <aymeric.fromherz@inria.fr>]

Thanks for the heads-up. We were being overly conservative during verification of inline assembly code in Vale, and marked several registers as possibly modified while they were only read.

This is now fixed for fmul, fmul2, fsqr and fsqr2, and will be merged into the master branch of EverCrypt shortly.
In the meantime, the diff for the resulting inline assembly after Vale codegen is available here: https://github.com/project-everest/hacl-star/pull/501/commits/1a71adb40c3f78da16e16975dbb1d4de5adeab8c#diff-5aabe9f6aa87508c9d81d4c9e89eff0b06b1e2aeaf5b04eba51da71c5bea6940

Cheers,
Aymeric

----- Mail original -----
> De: "Jason A. Donenfeld" <Jason@zx2c4.com>
> À: "Mathias Krause" <minipli@grsecurity.net>, "aymeric fromherz" <aymeric.fromherz@inria.fr>
> Cc: "WireGuard mailing list" <wireguard@lists.zx2c4.com>
> Envoyé: Vendredi 10 Décembre 2021 23:58:01
> Objet: Re: [PATCH 0/2] wireguard-linux-compat: grsecurity compat patches

> CC'ing in Aymeric, who's working on Vale's codegen.
> 
> On Thu, Dec 9, 2021 at 8:59 AM Mathias Krause <minipli@grsecurity.net> wrote:
>>
>> Am 08.12.21 um 15:56 schrieb Jason A. Donenfeld:
>> > On Mon, Dec 6, 2021 at 10:00 PM Mathias Krause <minipli@grsecurity.net> wrote:
>> >> Yes, probably, but you're mixing up the two.
>> >
>> > Oh, thanks, right.
>> >
>> > I'll talk to EverCrypt upstream and see.
>>
>> FWIW, 'out' is also wrongly flagged as output operand in fmul() and
>> fmul2(). But making it an input operand needs more surgery, as the
>> operand order changes and this requires some code churn.
>>
> > Mathias