[PATCH v3 0/2] provide check for ro_after_init memory sections

[Eddie Kovsky]

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-20170321 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(+)

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2.12.0