--- a/tools/testing/selftests/vm/protection_keys.c~selftests-vm-pkeys-refill-shadow-register-after-implicit-kernel-write +++ a/tools/testing/selftests/vm/protection_keys.c @@ -1448,6 +1448,13 @@ void test_implicit_mprotect_exec_only_me ret = mprotect(p1, PAGE_SIZE, PROT_EXEC); pkey_assert(!ret); + /* + * Reset the shadow, assuming that the above mprotect() + * correctly changed PKRU, but to an unknown value since + * the actual alllocated pkey is unknown. + */ + shadow_pkey_reg = __read_pkey_reg(); + dprintf2("pkey_reg: %016llx\n", read_pkey_reg()); /* Make sure this is an *instruction* fault */