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| author | Joey Gouly <joey.gouly@arm.com> | 2024-08-22 16:11:09 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-09-04 12:54:06 +0100 |
| commit | f5b5ea51f78f2ebd94d5a77702bbe5eee8924b50 (patch) | |
| tree | a2c023b2cc3ed42d6ecf9b283bb9757463052832 /tools/testing/selftests/mm/pkey-powerpc.h | |
| parent | 41bbcf7b4b046b4e7190c1866625aed0fe6f69f6 (diff) | |
selftests: mm: make protection_keys test work on arm64
The encoding of the pkey register differs on arm64, than on x86/ppc. On those
platforms, a bit in the register is used to disable permissions, for arm64, a
bit enabled in the register indicates that the permission is allowed.
This drops two asserts of the form:
assert(read_pkey_reg() <= orig_pkey_reg);
Because on arm64 this doesn't hold, due to the encoding.
The pkey must be reset to both access allow and write allow in the signal
handler. pkey_access_allow() works currently for PowerPC as the
PKEY_DISABLE_ACCESS and PKEY_DISABLE_WRITE have overlapping bits set.
Access to the uc_mcontext is abstracted, as arm64 has a different structure.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-27-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'tools/testing/selftests/mm/pkey-powerpc.h')
| -rw-r--r-- | tools/testing/selftests/mm/pkey-powerpc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/pkey-powerpc.h b/tools/testing/selftests/mm/pkey-powerpc.h index 6275d0f474b3..3d0c0bdae5bc 100644 --- a/tools/testing/selftests/mm/pkey-powerpc.h +++ b/tools/testing/selftests/mm/pkey-powerpc.h @@ -8,6 +8,8 @@ # define SYS_pkey_free 385 #endif #define REG_IP_IDX PT_NIP +#define MCONTEXT_IP(mc) mc.gp_regs[REG_IP_IDX] +#define MCONTEXT_TRAPNO(mc) mc.gp_regs[REG_TRAPNO] #define REG_TRAPNO PT_TRAP #define MCONTEXT_FPREGS #define gregs gp_regs |