linux-kernel - Re: [patch 10/16] x86/ldt: Do not install LDT for kernel threads

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Message-ID: <CALCETrWQ-u82-CvECyiX0U1oNhb3Cnp2rq7z3HLbpQ434FQeSA@mail.gmail.com>
Date:   Tue, 12 Dec 2017 09:57:52 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bpetkov@...e.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [patch 10/16] x86/ldt: Do not install LDT for kernel threads

On Tue, Dec 12, 2017 at 9:32 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
>
> Kernel threads can use the mm of a user process temporarily via use_mm(),
> but there is no point in installing the LDT which is associated to that mm
> for the kernel thread.
>

I like this one.