linux-kernel - Re: [PATCH v4 04/23] x86/mm: Save DRs when loading a temporary mm

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Message-ID: <20190425163650.GB5199@zn.tnic>
Date:   Thu, 25 Apr 2019 18:36:50 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Nadav Amit <nadav.amit@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>, linux_dti@...oud.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, akpm@...ux-foundation.org,
        kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
        will.deacon@....com, ard.biesheuvel@...aro.org,
        kristen@...ux.intel.com, deneen.t.dock@...el.com,
        Nadav Amit <namit@...are.com>
Subject: Re: [PATCH v4 04/23] x86/mm: Save DRs when loading a temporary mm


> Subject: Re: [PATCH v4 04/23] x86/mm: Save DRs when loading a temporary mm

s/DRs/debug registers/

On Mon, Apr 22, 2019 at 11:57:46AM -0700, Rick Edgecombe wrote:
> From: Nadav Amit <namit@...are.com>
> 
> Prevent user watchpoints from mistakenly firing while the temporary mm
> is being used. As the addresses that of the temporary mm might overlap

s/that //

> those of the user-process, this is necessary to prevent wrong signals
> or worse things from happening.
> 
> Cc: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Nadav Amit <namit@...are.com>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> ---
>  arch/x86/include/asm/mmu_context.h | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)

-- 
Regards/Gruss,
    Boris.

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