linux-kernel - Re: [RFC][PATCH] x86: Verify access

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Message-ID: <CA+55aFzUq8uqsJyZRdNy4Rt11L561YcahwtTkHNU3Y2LeXGJEw@mail.gmail.com>
Date:   Tue, 22 Nov 2016 11:42:19 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] x86: Verify access_ok() context

On Tue, Nov 22, 2016 at 11:37 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> CONFIG_DEBUG_VM seems somehow inappropriate.

The usual might_fault() logic? That uses

    defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)

(and "might_sleep()" uses just CONFIG_DEBUG_ATOMIC_SLEEP, maybe that's fine).

               Linus