1/* 2 * Copyright 2016, Michael Ellerman, IBM Corp. 3 * Licensed under GPLv2. 4 */ 5 6#include <stdio.h> 7#include <stdlib.h> 8#include <string.h> 9#include <sys/mman.h> 10 11#include <asm/cputable.h> 12 13#include "utils.h" 14 15#define SIZE (64 * 1024) 16 17int test_prot_sao(void) 18{ 19 char *p; 20 21 /* 2.06 or later should support SAO */ 22 SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06)); 23 24 /* 25 * Ensure we can ask for PROT_SAO. 26 * We can't really verify that it does the right thing, but at least we 27 * confirm the kernel will accept it. 28 */ 29 p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE | PROT_SAO, 30 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); 31 FAIL_IF(p == MAP_FAILED); 32 33 /* Write to the mapping, to at least cause a fault */ 34 memset(p, 0xaa, SIZE); 35 36 return 0; 37} 38 39int main(void) 40{ 41 return test_harness(test_prot_sao, "prot-sao"); 42} 43