When a key is freed, the key is no more effective. Clear the bits corresponding to the pkey in the shadow register. Otherwise it will carry some spurious bits which can trigger false-positive asserts.
cc: Dave Hansen dave.hansen@intel.com cc: Florian Weimer fweimer@redhat.com Signed-off-by: Ram Pai linuxram@us.ibm.com --- tools/testing/selftests/vm/protection_keys.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index ca54a95..aaf9f09 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -582,6 +582,9 @@ int alloc_pkey(void) int sys_pkey_free(unsigned long pkey) { int ret = syscall(SYS_pkey_free, pkey); + + if (!ret) + shadow_pkey_reg &= reset_bits(pkey, PKEY_DISABLE_ACCESS); dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret); return ret; }