On Mon, Jun 22, 2020 at 12:40:49PM -0700, Randy Dunlap wrote:

On 6/22/20 12:31 PM, Kees Cook wrote:

quoted

This provides the ability for architectures to enable kernel stack base
address offset randomization. This feature is controlled by the boot
param "randomize_kstack_offset=on/off", with its default value set by
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT.

Co-developed-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Link: https://lore.kernel.org/r/20190415060918.3766-1-elena.reshetova@intel.com (local)
Signed-off-by: Kees Cook <redacted>
---
 Makefile                         |  4 ++++
 arch/Kconfig                     | 23 ++++++++++++++++++
 include/linux/randomize_kstack.h | 40 ++++++++++++++++++++++++++++++++
 init/main.c                      | 23 ++++++++++++++++++
 4 files changed, 90 insertions(+)
 create mode 100644 include/linux/randomize_kstack.h

Please add documentation for the new kernel boot parameter to
Documentation/admin-guide/kernel-parameters.txt.

Oops, yes. Thanks for the reminder!

(I wonder if checkpatch can notice "+early_param" and suggest the Doc
update hmmm)

-- 
Kees Cook