1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <assert.h>
18 #include <stdint.h>
19 #include <stdlib.h>
20
21 #include "libs_utils.h"
22
23 // This library is built for all targets, including host tests, so __cfi_slowpath may not be
24 // present. But it is only used in the bionic loader tests.
25 extern "C" __attribute__((weak)) void __cfi_slowpath(uint64_t, void*);
26
27 static int g_count;
28
29 // Mock a CFI-enabled library without relying on the compiler.
30 extern "C" __attribute__((no_sanitize("hwaddress"))) __attribute__((aligned(4096)))
__cfi_check(uint64_t,void *,void *)31 void __cfi_check(uint64_t /*CallSiteTypeId*/, void* /*TargetAddr*/, void* /*Diag*/) {
32 ++g_count;
33 }
34
35 // This code runs before hwasan is initialized.
36 __attribute__((no_sanitize("hwaddress")))
preinit_ctor()37 void preinit_ctor() {
38 CHECK(g_count == 0);
39 __cfi_slowpath(42, reinterpret_cast<void*>(&preinit_ctor));
40 CHECK(g_count == 1);
41 }
42
43 __attribute__((section(".preinit_array"), used)) void (*preinit_ctor_p)(void) = preinit_ctor;
44
ctor()45 __attribute__((constructor, used)) void ctor() {
46 CHECK(g_count == 1);
47 __cfi_slowpath(42, reinterpret_cast<void*>(&ctor));
48 CHECK(g_count == 2);
49 }
50
main(void)51 int main(void) {
52 CHECK(g_count == 2);
53 __cfi_slowpath(42, reinterpret_cast<void*>(&main));
54 CHECK(g_count == 3);
55 return 0;
56 }
57