tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}