[PATCH v2 0/9] Enable STRICT_KERNEL_RWX

[Balbir Singh]

Enable STRICT_KERNEL_RWX for PPC64/BOOK3S

These patches enable RX mappings of kernel text.
rodata is mapped RX as well as a trade-off, there
are more details in the patch description

As a prerequisite for R/O text, patch_instruction
is moved over to using a separate mapping that
allows write to kernel text. xmon/ftrace/kprobes
have been moved over to work with patch_instruction

There are a few bug fixes, the updatepp and updateboltedpp
did not use flags as described in PAPR and the ptdump
utility ignored the first PFN

TODOs:
	1. Radix support
	2. 32 bit support

For Radix support, it should be simple, we need to revisit
the way linear mapping is done for text, avoid any 1G
maps to make sure we use 2M and then protect at that
granularity. I will send a follow-up patch to this series
adding radix support

There are patches for 32 bit support from Christophe Leroy
at http://patchwork.ozlabs.org/patch/768257/. The patches
for map_page to map_kernel_page are a pre-requisite.
Another build failure was reported, because instead
of using ARCH_HAS_SET_MEMORY as a gate for set_memory.h
inclusion, some of the infrastructure in the core kernel
uses CONFIG_STRICT_KERNEL_RWX.


Balbir Singh (9):
  powerpc/lib/code-patching: Enhance code patching
  powerpc/kprobes: Move kprobes over to patch_instruction
  powerpc/kprobes/optprobes: Move over to patch_instruction
  powerpc/xmon: Add patch_instruction supporf for xmon
  powerpc/vmlinux.lds: Align __init_begin to 16M
  powerpc/platform/pseries/lpar: Fix updatepp and updateboltedpp
  powerpc/mm/hash: Implement mark_rodata_ro() for hash
  powerpc/Kconfig: Enable STRICT_KERNEL_RWX
  powerpc/mm/ptdump: Dump the first entry of the linear mapping as well

 arch/powerpc/Kconfig                       |   1 +
 arch/powerpc/include/asm/book3s/64/hash.h  |   3 +
 arch/powerpc/include/asm/book3s/64/radix.h |   4 +
 arch/powerpc/kernel/kprobes.c              |   4 +-
 arch/powerpc/kernel/optprobes.c            |  58 ++++++++-----
 arch/powerpc/kernel/vmlinux.lds.S          |  10 ++-
 arch/powerpc/lib/code-patching.c           | 127 ++++++++++++++++++++++++++++-
 arch/powerpc/mm/dump_hashpagetable.c       |   2 +-
 arch/powerpc/mm/pgtable-hash64.c           |  35 ++++++++
 arch/powerpc/mm/pgtable-radix.c            |   7 ++
 arch/powerpc/mm/pgtable_64.c               |   9 ++
 arch/powerpc/platforms/pseries/lpar.c      |  13 ++-
 arch/powerpc/xmon/xmon.c                   |   7 +-
 13 files changed, 246 insertions(+), 34 deletions(-)

-- 
2.9.3