91 lines
3.3 KiB
Diff
91 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Josh Poimboeuf <jpoimboe@redhat.com>
|
|
Date: Fri, 13 Oct 2017 15:02:01 -0500
|
|
Subject: [PATCH] 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 <mingo@kernel.org>
|
|
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
|
|
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Cc: Peter Zijlstra <peterz@infradead.org>
|
|
Cc: Thomas Gleixner <tglx@linutronix.de>
|
|
Link: http://lkml.kernel.org/r/9b1237bbe7244ed9cdf8db2dcb1253e37e1c341e.1507924831.git.jpoimboe@redhat.com
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
(cherry picked from commit fc72ae40e30327aa24eb88a24b9c7058f938bd36)
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
(cherry picked from commit aff8d5169f46ae6ac0eb26a5ba745aaf9afa0704)
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
---
|
|
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
|
|
|