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9c0080ef93
linux/arch/x86/vdso
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Andy Lutomirski 9c0080ef93 x86/vdso: Make the PER_CPU segment start out accessed 
The first userspace attempt to read or write the PER_CPU segment
will write the accessed bit to the GDT.  This is visible to
userspace using the LAR instruction, and it also pointlessly
dirties a cache line.

Set the segment's accessed bit at boot to prevent userspace
access to segments from having side effects.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/ac63814ca4c637a08ec2fd0360d67ca67560a9ee.1411494540.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-10-28 11:22:11 +01:00
..
vdso32 x86/vdso: Improve the fake section headers 2014-06-19 15:45:12 -07:00
.gitignore x86, vdso: Reimplement vdso.so preparation in build-time C 2014-05-05 13:18:51 -07:00
checkundef.sh x86, vdso: Don't quote $nm in the script for checking vdso references 2010-07-27 23:52:29 -07:00
Makefile x86, vdso: Get rid of the fake section mechanism 2014-07-11 16:58:07 -07:00
vclock_gettime.c x86/vdso: Move DISABLE_BRANCH_PROFILING into the vdso makefile 2014-06-24 13:53:00 -07:00
vdso2c.c x86, vdso: Get rid of the fake section mechanism 2014-07-11 16:58:07 -07:00
vdso2c.h x86/vdso: Fix vdso2c's special_pages[] error checking 2014-09-24 09:55:38 +02:00
vdso32-setup.c arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area 2014-08-08 15:57:27 -07:00
vdso-layout.lds.S x86, vdso: Move the vvar area before the vdso text 2014-07-11 16:57:51 -07:00
vdso-note.S
vdso.lds.S x86/vdso: Improve the fake section headers 2014-06-19 15:45:12 -07:00
vdsox32.lds.S x86/vdso: Improve the fake section headers 2014-06-19 15:45:12 -07:00
vgetcpu.c x86: vdso: pvclock gettime support 2012-11-27 23:29:11 -02:00
vma.c x86/vdso: Make the PER_CPU segment start out accessed 2014-10-28 11:22:11 +01:00