Assortment of fixes to pkey to match its behavior to that on x86.
Patch 1 makes pkey consumable in multithreaded applications.
Patch 2 Deny, by default, permissions on all unallocated keys.
Patch 3 pkey allocation/free must not change pkey registers.
Patch 4 fixes fork to inherit the key attributes.
Patch 5 A off-by-one bug made one key unusable. Fixes it.
Patch 6 Makes pkey-0 less special.
Patch 7 fix to core-pkeys selftest to capture the modified behavior
Patch 8 fix to ptrace-pkeys selftest to capture the modified behavior
The above patch series is successfully verified using pkey selftests,
on both powerpc and x86.
Ram Pai (9):
powerpc/pkeys: Give all threads control of their key permissions
powerpc/pkeys: Deny read/write/execute by default
powerpc/pkeys: key allocation/deallocation must not change pkey
registers
powerpc/pkeys: Save the pkey registers before fork
powerpc/pkeys: fix calculation of total pkeys.
powerpc/pkeys: Preallocate execute-only key
powerpc/pkeys: make protection key 0 less special
powerpc/core-pkeys: execute-permission on keys are disabled by
default
powerpc/ptrace-pkeys: execute-permission on keys are disabled by
default
arch/powerpc/include/asm/pkeys.h | 40 +++---
arch/powerpc/kernel/process.c | 1 +
arch/powerpc/mm/pkeys.c | 141 +++++++-------------
tools/testing/selftests/powerpc/ptrace/core-pkey.c | 4 +
.../testing/selftests/powerpc/ptrace/ptrace-pkey.c | 5 +
5 files changed, 79 insertions(+), 112 deletions(-)
