linux-kernel - Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels

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Message-ID: <CAM1qvvjXhz65PGEqfgyeaL4rGtZf_Kcn8T_QSw0BYGY0VHW9tQ@mail.gmail.com>
Date:	Sun, 13 Apr 2014 15:03:07 +0200
From:	Jan Janecek <janjanjanx@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on
 64-bit kernels

2014-04-12 15:25, H. Peter Anvin:
> On 04/12/2014 02:53 PM, Linus Torvalds wrote:
>> On Sat, Apr 12, 2014 at 12:44 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>> Run a 32-bit VM.  The 32-bit kernel does this right.
>>
>> I really don't think that's the answer.
>>
>> If people really run these 16-bit programs, we need to allow it.
>> Clearly it used to work.
>>
>> Just make the unconditional "don't allow 16-bit segments" be a sysconf
>> entry.
>>
>
> Well, is there more than one user, really... that's my question.
>

Just to let you know, I use this too for running some old Win16 apps,
so there's at least two of us... But doesn't this change also break
DPMI apps running in dosemu?
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