Provide 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 is a bug fix, the updatepp and updateboltedpp
(pseries) providers, did not use flags as described in
PAPR (patch 3). I would like to see that patch marked
to stable, I've not added a Cc:stable myself.
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. I've sent a fix to the
fix the latter. It should be picked up by 4.13 at which
time we can remove the config dependency on !HIBERNATION
in arch/powerpc/Kconfig
This version received testing under CONFIG_RELOCATABLE_TEST.
CONFIG_STRICT_KERNEL_RWX does not work great with that config
and disables the feature when relocation is on and prints
a warning message.
After these changes go in we can get the PPC32 varaint
for the same feature based on patches already posted
by Christophe.
Changelog v5:
Drop patches accepted by Michael Ellerman
The radix patch has been reworked to
a. avoid splitting linear mapping when
CONFIG_STRICT_KERNEL_RWX is off
b. Fix the psize used for the linear mapping
There is also a bug fix to allow vector
areas to remain executable.
Changelog v4:
Multiple cleanups to patch_instruction() based on
review comments from Michael Ellerman
Changes to Kconfig to make the feature selectable
Changelog v3:
Support radix
Drop ptdump patch, already picked from v2
Changelog v2:
Support optprobes via patch_instruction
Balbir Singh (7):
powerpc/lib/code-patching: Use alternate map for patch_instruction()
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/mm/radix: Implement mark_rodata_ro() for radix
mm/radix: Fix permissions correctly for interrupt_vectors
powerpc/Kconfig: Enable STRICT_KERNEL_RWX
arch/powerpc/Kconfig | 2 +
arch/powerpc/include/asm/book3s/64/hash.h | 3 +
arch/powerpc/include/asm/book3s/64/radix.h | 4 +
arch/powerpc/kernel/vmlinux.lds.S | 10 +-
arch/powerpc/lib/code-patching.c | 160 ++++++++++++++++++++++++++++-
arch/powerpc/mm/pgtable-hash64.c | 41 ++++++++
arch/powerpc/mm/pgtable-radix.c | 86 +++++++++++++++-
arch/powerpc/mm/pgtable_64.c | 9 ++
arch/powerpc/platforms/pseries/lpar.c | 21 +++-
9 files changed, 327 insertions(+), 9 deletions(-)
--
2.9.4
