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

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Message-ID: <20190425181742.GZ11158@hirez.programming.kicks-ass.net>
Date:   Thu, 25 Apr 2019 20:17:42 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, 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>,
        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

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
> those of the user-process, this is necessary to prevent wrong signals
> or worse things from happening.

Ooh, goody, that would be fun indeed.

> Cc: Andy Lutomirski <luto@...nel.org>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

> Signed-off-by: Nadav Amit <namit@...are.com>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>