linux-kernel - Re: [patch 01/10] x86/fpu/signal: Clarify exception handling in restore_fpregs_from

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Message-ID: <CAHk-=wgJPH2fQOckAK0+ZThMgHSsXvAG+iYk7C9+zsnqMWUbrw@mail.gmail.com>
Date:   Mon, 30 Aug 2021 15:11:59 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [patch 01/10] x86/fpu/signal: Clarify exception handling in restore_fpregs_from_user()

On Mon, Aug 30, 2021 at 3:01 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> So yes, the negation does not matter, but the ability to check whether
> the fail was caused by #PF or not matters.

See my secopd email with a note on access granularity, and why this
kind of model doesn't seem to work in general and seems dangerous.

             Linus