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

Alexandre Julliard
2014-05-07T17:50:36Z

"H. Peter Anvin" <hpa@zytor.com> writes:

> On 05/07/2014 09:57 AM, Linus Torvalds wrote:
>>
>> Afaik, 16-bit programs under wine already need
>>
>> echo 0 > /proc/sys/vm/mmap_min_addr
>>
>> because they want to map things at address 0, so this isn't a new concept.
>>
>
> I think that applies to DOSEMU, but not to Wine.

Yes, there are a few exceptions, but most Win16 apps run fine without
mapping address 0.

> I'm somewhat curious if this program you have is actually a 32-bit
> program or if it is really a 16-bit program wrapped in a 32-bit
> installer of some kind. Hard to know without seeing the program in
> question.

It could be a mix of both, there are various thunking mechanisms that
allow 32-bit binaries to use 16-bit components. This was pretty common
in the Win95 days.

--
Alexandre Julliard
julliard@winehq.org