linux-kernel - Re: [PATCH v14 2/7] mm: add VM_DROPPABLE for designating always lazily freeable mappings

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Message-ID: <CAHk-=wg7vMC2VmSBdVw7EKV+7UDiftQEg3L+3Rc0rcjjfsvs5A@mail.gmail.com>
Date:   Mon, 9 Jan 2023 08:28:58 -0600
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Florian Weimer <fweimer@...hat.com>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, tglx@...utronix.de,
        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>,
        Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
        Christian Brauner <brauner@...nel.org>, linux-mm@...ck.org,
        mlichvar@...hat.com
Subject: Re: [PATCH v14 2/7] mm: add VM_DROPPABLE for designating always
 lazily freeable mappings

On Mon, Jan 9, 2023 at 4:34 AM Florian Weimer <fweimer@...hat.com> wrote:
>
> We did these changes on the glibc side because Jason sounded very
> confident that he's able to deliver vDSO acceleration for getrandom.  If
> that fails to materialize, we'll just have to add back userspace
> buffering in glibc.

My whole argument has been that user-space buffering is the sane thing
to do. Most definitely for something like glibc.

The number of people who go "oh, no, my buffer or randomness could be
exposed by insert-odd-situation-here" is approximately zero, and then
the onus should be on *them* to do something special.

Because *they* are special. Precious little snowflake special.

             Linus