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chunk: Optionally clear mmap'd chunk before unmapping

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This is mostly for the non-mmap case as with mmap available, access to the
unmapped memory isn't easily possible (e.g. opening the same area with
MAP_ANONYMOUS | MAP_UNINITIALIZED is usually prevented by the missing
CONFIG_MMAP_ALLOW_UNINITIALIZED option in most kernels).
This commit is contained in:
Tobias Brunner
2021-10-04 11:30:03 +02:00
parent b9aafa7ebf
commit e2e21f2486
3 changed files with 81 additions and 5 deletions
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src/libstrongswan/tests/suites/test_chunk.c
+39
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@@ -939,6 +939,44 @@ START_TEST(test_chunk_map)
}
END_TEST
START_TEST(test_chunk_map_clear)
{
chunk_t *map, contents = chunk_from_chars(0x01,0x02,0x03,0x04,0x05);
#ifdef WIN32
char *path = "C:\\Windows\\Temp\\strongswan-chunk-map-test";
#else
char *path = "/tmp/strongswan-chunk-map-clear-test";
#endif
ck_assert(chunk_write(contents, path, 022, TRUE));
/* read */
map = chunk_map(path, FALSE);
ck_assert(map != NULL);
ck_assert_msg(chunk_equals(*map, contents), "%B", map);
ck_assert(chunk_unmap_clear(map));
/* we can't verify that clearing worked as we don't have access to the
* memory anymore and mmap with MAP_ANONYMOUS | MAP_UNINITIALIZED of the
* same area will only work if the kernel allows this */
/* write */
map = chunk_map(path, TRUE);
ck_assert(map != NULL);
ck_assert_msg(chunk_equals(*map, contents), "%B", map);
map->ptr[0] = 0x42;
ck_assert(chunk_unmap_clear(map));
/* verify write */
contents.ptr[0] = 0x42;
map = chunk_map(path, FALSE);
ck_assert(map != NULL);
ck_assert_msg(chunk_equals(*map, contents), "%B", map);
ck_assert(chunk_unmap_clear(map));
unlink(path);
}
END_TEST
/*******************************************************************************
* test for chunk_from_fd
*/
@@ -1144,6 +1182,7 @@ Suite *chunk_suite_create()
tc = tcase_create("chunk_map");
tcase_add_test(tc, test_chunk_map);
tcase_add_test(tc, test_chunk_map_clear);
suite_add_tcase(s, tc);
tc = tcase_create("chunk_from_fd");