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Subject[RFC v2 00/12] powerpc: Memory Protection Keys
Date
Memory protection keys enable applications to protect its
address space from inadvertent access or corruption from
itself.

The overall idea:

A process allocates a key and associates it with
a address range within its address space.
The process than can dynamically set read/write
permissions on the key without involving the
kernel. Any code that violates the permissions
off the address space; as defined by its associated
key, will receive a segmentation fault.

This patch series enables the feature on PPC64.
It is enabled on HPTE 64K-page platform.

ISA3.0 section 5.7.13 describes the detailed specifications.


Testing:
This patch series has passed all the protection key
tests available in the selftests directory.
The tests are updated to work on both x86 and powerpc.


version v2:
(1) documentation and selftest added
(2) fixed a bug in 4k hpte backed 64k pte where page
invalidation was not done correctly, and
initialization of second-part-of-the-pte was not
done correctly if the pte was not yet Hashed
with a hpte. Reported by Aneesh.
(3) Fixed ABI breakage caused in siginfo structure.
Reported by Anshuman.

Outstanding known issue:
Calls to sys_swapcontext with a made-up context will end
up with a crap AMR if done by code who didn't know about
that register. -- Reported by Ben.

version v1: Initial version

Thanks-to: Dave Hansen, Aneesh, Paul Mackerras,
Michael Ellermen


Ram Pai (12):
Free up four 64K PTE bits in 4K backed hpte pages.
Free up four 64K PTE bits in 64K backed hpte pages.
Implement sys_pkey_alloc and sys_pkey_free system call.
store and restore the pkey state across context switches.
Implementation for sys_mprotect_pkey() system call.
Program HPTE key protection bits.
Macro the mask used for checking DSI exception
Handle exceptions caused by violation of pkey protection.
Deliver SEGV signal on pkey violation.
Read AMR only if pkey-violation caused the exception.
Documentation updates.
Updated protection key selftest

Documentation/vm/protection-keys.txt | 110 ++
Documentation/x86/protection-keys.txt | 85 --
arch/powerpc/Kconfig | 15 +
arch/powerpc/include/asm/book3s/64/hash-4k.h | 20 +
arch/powerpc/include/asm/book3s/64/hash-64k.h | 48 +-
arch/powerpc/include/asm/book3s/64/hash.h | 15 +-
arch/powerpc/include/asm/book3s/64/mmu-hash.h | 10 +
arch/powerpc/include/asm/book3s/64/mmu.h | 10 +
arch/powerpc/include/asm/book3s/64/pgtable.h | 84 +-
arch/powerpc/include/asm/mman.h | 29 +-
arch/powerpc/include/asm/mmu_context.h | 12 +
arch/powerpc/include/asm/paca.h | 1 +
arch/powerpc/include/asm/pkeys.h | 159 +++
arch/powerpc/include/asm/processor.h | 5 +
arch/powerpc/include/asm/reg.h | 10 +-
arch/powerpc/include/asm/systbl.h | 3 +
arch/powerpc/include/asm/unistd.h | 6 +-
arch/powerpc/include/uapi/asm/ptrace.h | 3 +-
arch/powerpc/include/uapi/asm/unistd.h | 3 +
arch/powerpc/kernel/asm-offsets.c | 5 +
arch/powerpc/kernel/exceptions-64s.S | 18 +-
arch/powerpc/kernel/process.c | 18 +
arch/powerpc/kernel/signal_32.c | 14 +
arch/powerpc/kernel/signal_64.c | 14 +
arch/powerpc/kernel/traps.c | 49 +
arch/powerpc/mm/Makefile | 1 +
arch/powerpc/mm/dump_linuxpagetables.c | 3 +-
arch/powerpc/mm/fault.c | 25 +-
arch/powerpc/mm/hash64_4k.c | 14 +-
arch/powerpc/mm/hash64_64k.c | 93 +-
arch/powerpc/mm/hash_utils_64.c | 35 +-
arch/powerpc/mm/hugetlbpage-hash64.c | 16 +-
arch/powerpc/mm/mmu_context_book3s64.c | 5 +
arch/powerpc/mm/pkeys.c | 267 +++++
include/linux/mm.h | 32 +-
include/uapi/asm-generic/mman-common.h | 2 +-
tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/pkey-helpers.h | 365 +++++++
tools/testing/selftests/vm/protection_keys.c | 1451 +++++++++++++++++++++++++
tools/testing/selftests/x86/Makefile | 2 +-
tools/testing/selftests/x86/pkey-helpers.h | 219 ----
tools/testing/selftests/x86/protection_keys.c | 1395 ------------------------
42 files changed, 2828 insertions(+), 1844 deletions(-)
create mode 100644 Documentation/vm/protection-keys.txt
delete mode 100644 Documentation/x86/protection-keys.txt
create mode 100644 arch/powerpc/include/asm/pkeys.h
create mode 100644 arch/powerpc/mm/pkeys.c
create mode 100644 tools/testing/selftests/vm/pkey-helpers.h
create mode 100644 tools/testing/selftests/vm/protection_keys.c
delete mode 100644 tools/testing/selftests/x86/pkey-helpers.h
delete mode 100644 tools/testing/selftests/x86/protection_keys.c

--
1.8.3.1

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