This is a note to let you know that I've just added the patch titled
docs: disable KASLR when debugging kernel
to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
docs-disable-kaslr-when-debugging-kernel.patch
and it can be found in the queue-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e604f1cb85367d2e5fd4cf253296d190996da81a Mon Sep 17 00:00:00 2001
From: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
Date: Fri, 7 Jul 2017 16:51:45 +0800
Subject: docs: disable KASLR when debugging kernel
From: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
commit e604f1cb85367d2e5fd4cf253296d190996da81a upstream.
commit 6807c84652b0 ("x86: Enable KASLR by default") enables KASLR
by default on x86. While KASLR will confuse gdb which resolve kernel
symbol address from symbol table of vmlinux. We should turn off KASLR for
kernel debugging.
Signed-off-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
Reviewed-by: Kieran Bingham <kbingham@xxxxxxxxxx>
Acked-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Jonathan Corbet <corbet@xxxxxxx>
Cc: Natale Patriciello <natale.patriciello@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Documentation/dev-tools/gdb-kernel-debugging.rst | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/Documentation/dev-tools/gdb-kernel-debugging.rst
+++ b/Documentation/dev-tools/gdb-kernel-debugging.rst
@@ -31,11 +31,13 @@ Setup
CONFIG_DEBUG_INFO_REDUCED off. If your architecture supports
CONFIG_FRAME_POINTER, keep it enabled.
-- Install that kernel on the guest.
+- Install that kernel on the guest, turn off KASLR if necessary by adding
+ "nokaslr" to the kernel command line.
Alternatively, QEMU allows to boot the kernel directly using -kernel,
-append, -initrd command line switches. This is generally only useful if
you do not depend on modules. See QEMU documentation for more details on
- this mode.
+ this mode. In this case, you should build the kernel with
+ CONFIG_RANDOMIZE_BASE disabled if the architecture supports KASLR.
- Enable the gdb stub of QEMU/KVM, either
Patches currently in stable-queue which might be from zhouzhouyi@xxxxxxxxx are
queue-4.13/docs-disable-kaslr-when-debugging-kernel.patch