[RFC 0/3] Allow CONFIG_DEBUG_SET_MODULE_RONX to be used on ARM

[Laura Abbott]

Hi,

This is an RFC to allow CONFIG_DEBUG_SET_MODULE_RONX to be used on ARM. The
current config description from x86 describes it best:

	This option helps catch unintended modifications to loadable
	kernel module's text and read-only data. It also prevents execution
	of module data. Such protection may interfere with run-time code
	patching and dynamic kernel tracing - and they might also protect
	against certain classes of kernel exploits.

ARM was missing a few functions to modify the page tables so those have been
added. I believe modules are always mapped with pages so changing them at map
time should be acceptable. Comments/concerns are appreciated.

Thanks,
Laura

---

 arch/arm/Kconfig.debug            |   11 +++++
 arch/arm/include/asm/cacheflush.h |    5 ++
 arch/arm/include/asm/pgtable.h    |    2 +
 arch/arm/mm/mmu.c                 |   86 +++++++++++++++++++++++++++++++++++++
 4 files changed, 104 insertions(+), 0 deletions(-)