linux-kernel - Re: [PATCH RFC v3] random: implement getrandom() in vDSO

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Message-ID: <CAHmME9rye4sqKNbpu=oOvLjgMY=Whi13Qz8L0xyZR=Ty27pHfw@mail.gmail.com>
Date:   Tue, 8 Nov 2022 12:40:19 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...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>
Subject: Re: [PATCH RFC v3] random: implement getrandom() in vDSO

On Tue, Nov 8, 2022 at 9:32 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Fri, Sep 16 2022 at 13:59, Jason A. Donenfeld wrote:
> > ---
> >  MAINTAINERS                            |   2 +
> >  arch/x86/entry/syscalls/syscall_32.tbl |   1 +
> >  arch/x86/entry/syscalls/syscall_64.tbl |   1 +
> >  arch/x86/entry/vdso/Makefile           |   3 +-
> >  arch/x86/entry/vdso/vdso.lds.S         |   2 +
> >  arch/x86/entry/vdso/vgetrandom.c       |  16 ++++
> >  arch/x86/include/asm/vdso/getrandom.h  |  37 ++++++++
> >  arch/x86/include/asm/vvar.h            |  16 ++++
> >  drivers/char/random.c                  |  64 ++++++++++++++
> >  include/vdso/datapage.h                |   6 ++
> >  lib/crypto/chacha.c                    |   4 +
> >  lib/vdso/getrandom.c                   | 117 +++++++++++++++++++++++++
> >  lib/vdso/getrandom.h                   |  25 ++++++
> >  13 files changed, 293 insertions(+), 1 deletion(-)
> >  create mode 100644 arch/x86/entry/vdso/vgetrandom.c
> >  create mode 100644 arch/x86/include/asm/vdso/getrandom.h
> >  create mode 100644 lib/vdso/getrandom.c
> >  create mode 100644 lib/vdso/getrandom.h
>
> This is not how it works. Please split this apart into reviewable bits
> and pieces:
>
> 1) Add the new syscall
> 2) Add the vdso infrastructure
> 3) Wire it up on x86

No problem, will do.

Jason