linux-kernel - Re: [PATCH v18 5/5] x86: vdso: Wire up getrandom() vDSO implementation

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Date: Fri, 28 Jun 2024 15:57:47 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: "Jason A. Donenfeld" <Jason@...c4.com>, linux-kernel@...r.kernel.org,
 patches@...ts.linux.dev
Cc: "Jason A. Donenfeld" <Jason@...c4.com>, 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>, Jann
 Horn <jannh@...gle.com>, Christian Brauner <brauner@...nel.org>, David
 Hildenbrand <dhildenb@...hat.com>, Samuel Neves <sneves@....uc.pt>
Subject: Re: [PATCH v18 5/5] x86: vdso: Wire up getrandom() vDSO implementation

On Thu, Jun 20 2024 at 02:53, 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. There's a simple test for this code as well.
>
> Reviewed-by: Samuel Neves <sneves@....uc.pt> # for vgetrandom-chacha.S
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>