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selftests: soft-dirty: add test for mprotect 

Add two soft-dirty test cases for mprotect() on both anon or file.

Link: https://lkml.kernel.org/r/20220725142048.30450-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2022-07-25 10:20:47 -04:00 committed by akpm
parent 76aefad628
commit c942f5bd17
1 changed files with 66 additions and 1 deletions
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67
tools/testing/selftests/vm/soft-dirty.c
View File

@ -121,13 +121,76 @@ static void test_hugepage(int pagemap_fd, int pagesize)
free(map);
}
static void test_mprotect(int pagemap_fd, int pagesize, bool anon)
{
const char *type[] = {"file", "anon"};
const char *fname = "./soft-dirty-test-file";
int test_fd;
char *map;
if (anon) {
map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
if (!map)
ksft_exit_fail_msg("anon mmap failed\n");
} else {
test_fd = open(fname, O_RDWR | O_CREAT);
if (test_fd < 0) {
ksft_test_result_skip("Test %s open() file failed\n", __func__);
return;
}
unlink(fname);
ftruncate(test_fd, pagesize);
map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
MAP_SHARED, test_fd, 0);
if (!map)
ksft_exit_fail_msg("file mmap failed\n");
}
*map = 1;
ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 1,
"Test %s-%s dirty bit of new written page\n",
__func__, type[anon]);
clear_softdirty();
ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 0,
"Test %s-%s soft-dirty clear after clear_refs\n",
__func__, type[anon]);
mprotect(map, pagesize, PROT_READ);
ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 0,
"Test %s-%s soft-dirty clear after marking RO\n",
__func__, type[anon]);
mprotect(map, pagesize, PROT_READ|PROT_WRITE);
ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 0,
"Test %s-%s soft-dirty clear after marking RW\n",
__func__, type[anon]);
*map = 2;
ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 1,
"Test %s-%s soft-dirty after rewritten\n",
__func__, type[anon]);
munmap(map, pagesize);
if (!anon)
close(test_fd);
}
static void test_mprotect_anon(int pagemap_fd, int pagesize)
{
test_mprotect(pagemap_fd, pagesize, true);
}
static void test_mprotect_file(int pagemap_fd, int pagesize)
{
test_mprotect(pagemap_fd, pagesize, false);
}
int main(int argc, char **argv)
{
int pagemap_fd;
int pagesize;
ksft_print_header();
ksft_set_plan(5);
ksft_set_plan(15);
pagemap_fd = open(PAGEMAP_FILE_PATH, O_RDONLY);
if (pagemap_fd < 0)
@ -138,6 +201,8 @@ int main(int argc, char **argv)
test_simple(pagemap_fd, pagesize);
test_vma_reuse(pagemap_fd, pagesize);
test_hugepage(pagemap_fd, pagesize);
test_mprotect_anon(pagemap_fd, pagesize);
test_mprotect_file(pagemap_fd, pagesize);
close(pagemap_fd);