linux-kernel - Re: [PATCH v10 4/4] x86: vdso: Wire up getrandom() vDSO implementation

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Message-ID: <Y4atwmYQOV0cZ4n6@zx2c4.com>
Date:   Wed, 30 Nov 2022 02:11:30 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        linux-crypto@...r.kernel.org, linux-api@...r.kernel.org,
        x86@...nel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
        Carlos O'Donell <carlos@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Brauner <brauner@...nel.org>,
        Samuel Neves <sneves@....uc.pt>
Subject: Re: [PATCH v10 4/4] x86: vdso: Wire up getrandom() vDSO
 implementation

Hi Thomas,

On Tue, Nov 29, 2022 at 11:52:05PM +0100, Thomas Gleixner wrote:
> On Tue, Nov 29 2022 at 22:06, Jason A. Donenfeld wrote:
> > Hook up the generic vDSO implementation to the x86 vDSO data page. Since
> > the existing vDSO infrastructure is heavily based on the timekeeping
> > functionality, which works over arrays of bases, a new macro is
> > introduced for vvars that are not arrays.
> >
> > The vDSO function requires a ChaCha20 implementation that does not write
> > to the stack, yet can still do an entire ChaCha20 permutation, so
> > provide this using SSE2, since this is userland code that must work on
> > all x86-64 processors.
> 
> Way more consumable and looks about right.

Good.

> Please take your time and
> give others a chance to look at this lot before rushing out v11.

That's my plan indeed. Now that the patch is reviewable, I'll let it sit
for a while. In between v10 and v11, my scratch work will be in
<https://git.zx2c4.com/linux-rng/log/?h=vdso>, which is rebased often.

Thanks again for looking this over.

Jason