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linux/arch/x86/vdso
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Linus Torvalds fa81511bb0 x86-64, modify_ldt: Make support for 16-bit segments a runtime option 
Checkin:

b3b42ac2cb x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels

disabled 16-bit segments on 64-bit kernels due to an information
leak.  However, it does seem that people are genuinely using Wine to
run old 16-bit Windows programs on Linux.

A proper fix for this ("espfix64") is coming in the upcoming merge
window, but as a temporary fix, create a sysctl to allow the
administrator to re-enable support for 16-bit segments.

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.

The sysctl 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 ;)

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/CA%2B55aFw9BPoD10U1LfHbOMpHWZkvJTkMcfCs9s3urPr1YyWBxw@mail.gmail.com
Cc: <stable@vger.kernel.org>
2014-05-14 16:33:54 -07:00
..
vdso32 x86, vdso: Fix the symbol versions on the 32-bit vDSO 2014-03-30 10:08:38 -07:00
.gitignore x32: Add x32 VDSO support 2012-02-20 12:52:06 -08:00
checkundef.sh
Makefile Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-02 12:26:43 -07:00
vclock_gettime.c x86, vdso: Add 32 bit VDSO time support for 64 bit kernel 2014-03-18 12:52:41 -07:00
vdso32-setup.c x86-64, modify_ldt: Make support for 16-bit segments a runtime option 2014-05-14 16:33:54 -07:00
vdso32.S x86, vdso: Move more vdso definitions into vdso.h 2014-03-20 20:20:08 -07:00
vdso-layout.lds.S x86, vdso: Make the vdso linker script compatible with Gold 2014-04-03 12:03:59 -07:00
vdso-note.S
vdso.lds.S x86-64: Add time to vDSO 2011-05-24 14:51:29 +02:00
vdso.S x86, vdso: Move more vdso definitions into vdso.h 2014-03-20 20:20:08 -07:00
vdsox32.lds.S x32: Drop non-__vdso weak symbols from the x32 VDSO 2012-02-22 20:40:07 -08:00
vdsox32.S x86, vdso: Move more vdso definitions into vdso.h 2014-03-20 20:20:08 -07:00
vgetcpu.c x86: vdso: pvclock gettime support 2012-11-27 23:29:11 -02:00
vma.c x86, vdso: Move more vdso definitions into vdso.h 2014-03-20 20:20:08 -07:00