[CRIU] [PATCH] criu: x86 -- Drop @ds test from compat mode

[Cyrill Gorcunov]

On Wed, Apr 06, 2016 at 07:57:08PM +0300, Dmitry Safonov wrote:
> On 04/06/2016 05:33 PM, Cyrill Gorcunov wrote:
> >On Wed, Apr 06, 2016 at 04:25:21PM +0200, Federico Reghenzani wrote:
> >>    Ok, I patched CRIU, I tried 3 times and it works but I have to test
> >>    further, I'll update you has soon of possible (probably tomorrow or
> >>    friday).
> >>    Thanks for your really fast patch :)
> >Thank you! Actaully I really wonder who needs null selector -- any attempts
> >to dereference is will cause #gp. So the question is that -- is there something
> >screwed by CRIU restore procedure, or the program indeed zeroifies @ds register.
> 
> Hmm, just FYI, I reworked this part in compatible patches set.
> It will check iov.iov_len, returned by PTRACE_GETREGSET.
> (It depends on compatible thread flag)
> The same approach uses strace from 4.8 version:
> https://sourceforge.net/projects/strace/files/strace/4.8/
> 
> So, this will be good, when patches set will made it's way to master.

Sounds OK to me as well. So threy rather check the size of frame.
Feel free to send your patch instead (checkig for hardcoded CS
value is a bit unportable anyway).