linux-kernel - Re: [PATCH RFC 3/4] x86/pti: don't mark the user PGD with _PAGE

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Message-ID: <4031a5e5-510f-49e6-ee24-f49bf5f2553d@intel.com>
Date:   Mon, 8 Jan 2018 10:44:37 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, Willy Tarreau <w@....eu>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        gnomes@...rguk.ukuu.org.uk, torvalds@...ux-foundation.org
Subject: Re: [PATCH RFC 3/4] x86/pti: don't mark the user PGD with _PAGE_NX.

On 01/08/2018 09:50 AM, Ingo Molnar wrote:
>> This does get immensely easier if we choose a mode at exec() (or fork()
>> even) and never change it.  The prctl() _could_ just be a flag to tell
>> what your children should do.
> Switching PTI on/off for a whole process would be nightmarish.

Yeah, totally.  I meant "future children" aka. things *after* fork().