Andy Lutomirski 898fe968f7 selftests/x86/ldt_gdt: Robustify against set_thread_area() and LAR oddities ...

[ Upstream commit d60ad744c9 ]

Bits 19:16 of LAR's result are undefined, and some upcoming
improvements to the test case seem to trigger this.  Mask off those
bits to avoid spurious failures.

commit 5b781c7e31 ("x86/tls: Forcibly set the accessed bit in TLS
segments") adds a valid case in which LAR's output doesn't quite
agree with set_thread_area()'s input.  This isn't triggered in the
test as is, but it will be if we start calling set_thread_area()
with the accessed bit clear.  Work around this discrepency.

I've added a Fixes tag so that -stable can pick this up if neccesary.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 5b781c7e31 ("x86/tls: Forcibly set the accessed bit in TLS segments")
Link: http://lkml.kernel.org/r/b82f3f89c034b53580970ac865139fd8863f44e2.1509794321.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-12-10 13:40:39 +01:00

..

bpf

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breakpoints

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capabilities

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cpu-hotplug

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cpufreq

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drivers/gpu

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efivarfs

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exec

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filesystems

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firmware

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ftrace

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intel_pstate

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ipc

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kcmp

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kmod

test_kmod: fix description for -s -and -c parameters

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lib

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locking

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media_tests

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membarrier

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memfd

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memory-hotplug

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mount

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mqueue

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net

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networking/timestamping

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nsfs

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ntb

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powerpc

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size

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sysctl

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tc-testing

Merge tag 'spdx_identifiers-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

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timers

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user

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watchdog

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x86

selftests/x86/ldt_gdt: Robustify against set_thread_area() and LAR oddities

2017-12-10 13:40:39 +01:00

zram

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.gitignore

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kselftest_harness.h

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kselftest.h

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lib.mk

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Makefile

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