On Wed, May 7, 2014 at 2:18 AM, Sven Joachim <svenjoac@gmx.de> wrote:
>
> It seems that at least some 32-bit programs are also broken, since after
> upgrading the kernel to 3.14.3 I can no longer start my old chess
> database program:

So for backporting (and for 3.15) maybe this (TOTALLY UNTESTED) patch
would be acceptable.

It adds a "/proc/sys/abi/ldt16" sysctl that defaults to zero (off). If
you hit this issue and care about your old Windows program more than
you care about a kernel stack address information leak, you can do

   echo 1 > /proc/sys/abi/ldt16

as root (add it to your startup scripts), and you should be ok.

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 would like to repeat that this is totally untested. And the sysct
table is only added if you have COMPAT support enabled on x86-64, but
I assume anybody who runs old windows binaries very much does that ;)

                        Linus