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	x86, vdso: Don't quote $nm in the script for checking vdso references	2010-07-27 23:52:29 -07:00
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
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
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
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