2017-11-08 17:11:06

by Denys Vlasenko

[permalink] [raw]
Subject: Re: [tip:x86/asm] x86/umip: Add emulation code for UMIP instructions

On 11/08/2017 05:57 PM, Linus Torvalds wrote:
> On Wed, Nov 8, 2017 at 8:53 AM, Denys Vlasenko <[email protected]> wrote:
>> We can postpone enabling UMIP by default by a year or so.
>> By this time, new Wine will be on majority of users' machines.
>
> So you are suggesting we run unnecessarily insecure, only in order to
> not do the emulation that we already have the code for and that the
> patch implements?

We ran insecure in this way for ~25 years.

> Why?

To avoid having to maintain more obscure, rarely executed code.

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