Provide a mechanism for other functions to verify that their arguments
are read-only.
This implements the first half of a suggestion made by Kees Cook for
the Kernel Self Protection Project:
- provide mechanism to check for ro_after_init memory areas, and
reject structures not marked ro_after_init in vmbus_register()
http://www.openwall.com/lists/kernel-hardening/2017/02/04/1
The idea is to prevent structures (including modules) that are not
read-only from being passed to functions. It builds upon the functions
in kernel/extable.c that test if an address is in the text section.
I have dropped the third patch that uses these features to check the
arguments to vmbus_register() because the maintainers have not been
receptive to using it. My goal right now is to get the API right.
I have test compiled this series on next-20170324 for x86.
Eddie Kovsky (2):
module: verify address is read-only
extable: verify address is read-only
include/linux/kernel.h | 2 ++
include/linux/module.h | 12 ++++++++++++
kernel/extable.c | 29 +++++++++++++++++++++++++++
kernel/module.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 96 insertions(+)
--
2.12.1
