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- From a8ec58033a185db5d8c180d3508d34b8ae3a1c89 Mon Sep 17 00:00:00 2001
- From: Josh Poimboeuf <[email protected]>
- Date: Fri, 13 Oct 2017 15:02:01 -0500
- Subject: [PATCH 064/242] x86/unwind: Make CONFIG_UNWINDER_ORC=y the default in
- kconfig for 64-bit
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
- CVE-2017-5754
- The ORC unwinder has been stable in testing so far. Give it much wider
- testing by making it the default in kconfig for x86_64. It's not yet
- supported for 32-bit, so leave frame pointers as the default there.
- Suggested-by: Ingo Molnar <[email protected]>
- Signed-off-by: Josh Poimboeuf <[email protected]>
- Cc: Linus Torvalds <[email protected]>
- Cc: Peter Zijlstra <[email protected]>
- Cc: Thomas Gleixner <[email protected]>
- Link: http://lkml.kernel.org/r/9b1237bbe7244ed9cdf8db2dcb1253e37e1c341e.1507924831.git.jpoimboe@redhat.com
- Signed-off-by: Ingo Molnar <[email protected]>
- (cherry picked from commit fc72ae40e30327aa24eb88a24b9c7058f938bd36)
- Signed-off-by: Andy Whitcroft <[email protected]>
- Signed-off-by: Kleber Sacilotto de Souza <[email protected]>
- (cherry picked from commit aff8d5169f46ae6ac0eb26a5ba745aaf9afa0704)
- Signed-off-by: Fabian Grünbichler <[email protected]>
- ---
- arch/x86/Kconfig.debug | 33 +++++++++++++++++----------------
- 1 file changed, 17 insertions(+), 16 deletions(-)
- diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
- index 5435a943f894..7d88e9878a75 100644
- --- a/arch/x86/Kconfig.debug
- +++ b/arch/x86/Kconfig.debug
- @@ -358,27 +358,13 @@ config PUNIT_ATOM_DEBUG
-
- choice
- prompt "Choose kernel unwinder"
- - default UNWINDER_FRAME_POINTER
- + default UNWINDER_ORC if X86_64
- + default UNWINDER_FRAME_POINTER if X86_32
- ---help---
- This determines which method will be used for unwinding kernel stack
- traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,
- livepatch, lockdep, and more.
-
- -config UNWINDER_FRAME_POINTER
- - bool "Frame pointer unwinder"
- - select FRAME_POINTER
- - ---help---
- - This option enables the frame pointer unwinder for unwinding kernel
- - stack traces.
- -
- - The unwinder itself is fast and it uses less RAM than the ORC
- - unwinder, but the kernel text size will grow by ~3% and the kernel's
- - overall performance will degrade by roughly 5-10%.
- -
- - This option is recommended if you want to use the livepatch
- - consistency model, as this is currently the only way to get a
- - reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE).
- -
- config UNWINDER_ORC
- bool "ORC unwinder"
- depends on X86_64
- @@ -396,6 +382,21 @@ config UNWINDER_ORC
- Enabling this option will increase the kernel's runtime memory usage
- by roughly 2-4MB, depending on your kernel config.
-
- +config UNWINDER_FRAME_POINTER
- + bool "Frame pointer unwinder"
- + select FRAME_POINTER
- + ---help---
- + This option enables the frame pointer unwinder for unwinding kernel
- + stack traces.
- +
- + The unwinder itself is fast and it uses less RAM than the ORC
- + unwinder, but the kernel text size will grow by ~3% and the kernel's
- + overall performance will degrade by roughly 5-10%.
- +
- + This option is recommended if you want to use the livepatch
- + consistency model, as this is currently the only way to get a
- + reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE).
- +
- config UNWINDER_GUESS
- bool "Guess unwinder"
- depends on EXPERT
- --
- 2.14.2
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