Memory protection keys enables an application to protect its address space from inadvertent access by its own code.

This feature is now enabled on powerpc and has been available since 4.16-rc1. The patches move the selftests to arch neutral directory and enhance their test coverage.

Tested on powerpc64 and x86_64 (Skylake-SP).

Link to development branch: https://github.com/sandip4n/linux/tree/pkey-selftests

Changelog --------- Link to previous version (v16): https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=153824

v17: (1) Fixed issues with i386 builds when running on x86_64 based on feedback from Dave. (2) Replaced patch 6 from previous version with patch 7. This addresses u64 format specifier related concerns that Michael had raised in v15.

v16: (1) Rebased on top of latest master. (2) Switched to u64 instead of using an arch-dependent pkey_reg_t type for references to the pkey register based on suggestions from Dave, Michal and Michael. (3) Removed build time determination of page size based on suggestion from Michael. (4) Fixed comment before the definition of __page_o_noops() from patch 13 ("selftests/vm/pkeys: Introduce powerpc support").

v15: (1) Rebased on top of latest master. (2) Addressed review comments from Dave Hansen. (3) Moved code for getting or setting pkey bits to new helpers. These changes replace patch 7 of v14. (4) Added a fix which ensures that the correct count of reserved keys is used across different platforms. (5) Added a fix which ensures that the correct page size is used as powerpc supports both 4K and 64K pages.

v14: (1) Incorporated another round of comments from Dave Hansen.

v13: (1) Incorporated comments for Dave Hansen. (2) Added one more test for correct pkey-0 behavior.

v12: (1) Fixed the offset of pkey field in the siginfo structure for x86_64 and powerpc. And tries to use the actual field if the headers have it defined.

v11: (1) Fixed a deadlock in the ptrace testcase.

v10 and prior: (1) Moved the testcase to arch neutral directory. (2) Split the changes into incremental patches.

Desnes A. Nunes do Rosario (1): selftests/vm/pkeys: Fix number of reserved powerpc pkeys

Ram Pai (16): selftests/x86/pkeys: Move selftests to arch-neutral directory selftests/vm/pkeys: Rename all references to pkru to a generic name selftests/vm/pkeys: Move generic definitions to header file selftests/vm/pkeys: Fix pkey_disable_clear() selftests/vm/pkeys: Fix assertion in pkey_disable_set/clear() selftests/vm/pkeys: Fix alloc_random_pkey() to make it really random selftests/vm/pkeys: Introduce generic pkey abstractions selftests/vm/pkeys: Introduce powerpc support selftests/vm/pkeys: Fix assertion in test_pkey_alloc_exhaust() selftests/vm/pkeys: Improve checks to determine pkey support selftests/vm/pkeys: Associate key on a mapped page and detect access violation selftests/vm/pkeys: Associate key on a mapped page and detect write violation selftests/vm/pkeys: Detect write violation on a mapped access-denied-key page selftests/vm/pkeys: Introduce a sub-page allocator selftests/vm/pkeys: Test correct behaviour of pkey-0 selftests/vm/pkeys: Override access right definitions on powerpc

Sandipan Das (5): selftests: vm: pkeys: Fix multilib builds for x86 selftests: vm: pkeys: Use sane types for pkey register selftests: vm: pkeys: Add helpers for pkey bits selftests: vm: pkeys: Use the correct huge page size selftests: vm: pkeys: Use the correct page size on powerpc

Thiago Jung Bauermann (2): selftests/vm/pkeys: Move some definitions to arch-specific header selftests/vm/pkeys: Make gcc check arguments of sigsafe_printf()

tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 50 ++ tools/testing/selftests/vm/pkey-helpers.h | 225 ++++++ tools/testing/selftests/vm/pkey-powerpc.h | 136 ++++ tools/testing/selftests/vm/pkey-x86.h | 181 +++++ .../selftests/{x86 => vm}/protection_keys.c | 696 ++++++++++-------- tools/testing/selftests/x86/.gitignore | 1 - tools/testing/selftests/x86/Makefile | 2 +- tools/testing/selftests/x86/pkey-helpers.h | 219 ------ 9 files changed, 979 insertions(+), 532 deletions(-) create mode 100644 tools/testing/selftests/vm/pkey-helpers.h create mode 100644 tools/testing/selftests/vm/pkey-powerpc.h create mode 100644 tools/testing/selftests/vm/pkey-x86.h rename tools/testing/selftests/{x86 => vm}/protection_keys.c (74%) delete mode 100644 tools/testing/selftests/x86/pkey-helpers.h