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 17 int 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 39 int main(void) 40 { 41 return test_harness(test_prot_sao, "prot-sao"); 42 } 43