Assortment of fixes to pkey.
Patch 1 makes pkey consumable in multithreaded applications.
Patch 2 fixes fork behavior to inherit the key attributes.
Patch 3 A off-by-one bug made one key unusable. Fixes it.
Patch 4 Execute-only key is preallocated.
Patch 5 Makes pkey-0 less special.
Patch 6 Deny by default permissions on all unallocated keys.
Passes all selftests on powerpc. Also behavior verified to be correct
by Florian.
Changelog:
v2: . fixed merge conflict with upstream code.
. Add patch 6. Makes the behavior consistent
with that on x86.
Ram Pai (6):
powerpc/pkeys: Enable all user-allocatable pkeys at init.
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/pkeys: Deny read/write/execute by default
arch/powerpc/include/asm/pkeys.h | 29 +++++++++--
arch/powerpc/kernel/process.c | 1 +
arch/powerpc/mm/pkeys.c | 102 ++++++++++++-------------------------
3 files changed, 57 insertions(+), 75 deletions(-)
