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

[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@xxxxxxxxx> 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.

But yes, we can make it configurable, but the default should almost
certainly be off.

	-hpa


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