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selftests/powerpc: Add a test for PROT_SAO

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PROT_SAO is a powerpc-specific flag to mmap(), and we rely on arch
specific logic to allow it to be passed to mmap().

Add a small test to ensure mmap() accepts PROT_SAO. We don't have a good
way to test that it actually causes the mapping to be created with the
right flags, so for now we just touch the mapping so it's faulted in. In
future we might be able to do something better.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2016-07-11 15:25:18 +10:00
parent e0ddf7a245
commit 24af8c5a52
4 changed files with 51 additions and 1 deletions
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1
tools/testing/selftests/powerpc/mm/.gitignore vendored
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@ -1,3 +1,4 @@
hugetlb_vs_thp_test
subpage_prot
tempfile
prot_sao

4
tools/testing/selftests/powerpc/mm/Makefile
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@ -1,13 +1,15 @@
noarg:
$(MAKE) -C ../
TEST_PROGS := hugetlb_vs_thp_test subpage_prot
TEST_PROGS := hugetlb_vs_thp_test subpage_prot prot_sao
TEST_FILES := tempfile
all: $(TEST_PROGS) $(TEST_FILES)
$(TEST_PROGS): ../harness.c
prot_sao: ../utils.c
include ../../lib.mk
tempfile:

42
tools/testing/selftests/powerpc/mm/prot_sao.c Normal file
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@ -0,0 +1,42 @@
/*
* Copyright 2016, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <asm/cputable.h>
#include "utils.h"
#define SIZE (64 * 1024)
int test_prot_sao(void)
{
char *p;
/* 2.06 or later should support SAO */
SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));
/*
* Ensure we can ask for PROT_SAO.
* We can't really verify that it does the right thing, but at least we
* confirm the kernel will accept it.
*/
p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE | PROT_SAO,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
FAIL_IF(p == MAP_FAILED);
/* Write to the mapping, to at least cause a fault */
memset(p, 0xaa, SIZE);
return 0;
}
int main(void)
{
return test_harness(test_prot_sao, "prot-sao");
}

5
tools/testing/selftests/powerpc/utils.h
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@ -27,6 +27,11 @@ int test_harness(int (test_function)(void), char *name);
extern void *get_auxv_entry(int type);
int pick_online_cpu(void);
static inline bool have_hwcap(unsigned long ftr)
{
return ((unsigned long)get_auxv_entry(AT_HWCAP) & ftr) == ftr;
}
static inline bool have_hwcap2(unsigned long ftr2)
{
return ((unsigned long)get_auxv_entry(AT_HWCAP2) & ftr2) == ftr2;