| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <assert.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| |
| // This library is built for all targets, including host tests, so __cfi_slowpath may not be |
| // present. But it is only used in the bionic loader tests. |
| extern "C" __attribute__((weak)) void __cfi_slowpath(uint64_t, void*); |
| |
| static size_t g_count; |
| static uint64_t g_last_type_id; |
| static void* g_last_address; |
| static void* g_last_diag; |
| |
| extern "C" { |
| |
| // Make sure the library crosses at least one kLibraryAlignment(=256KB) boundary. |
| char bss[1024 * 1024]; |
| |
| // Mock a CFI-enabled library without relying on the compiler. |
| __attribute__((aligned(4096))) void __cfi_check(uint64_t CallSiteTypeId, void* TargetAddr, |
| void* Diag) { |
| ++g_count; |
| g_last_type_id = CallSiteTypeId; |
| g_last_address = TargetAddr; |
| g_last_diag = Diag; |
| } |
| |
| size_t get_count() { |
| return g_count; |
| } |
| |
| uint64_t get_last_type_id() { |
| return g_last_type_id; |
| } |
| |
| void* get_last_address() { |
| return g_last_address; |
| } |
| |
| void* get_last_diag() { |
| return g_last_diag; |
| } |
| |
| void* get_global_address() { |
| return &g_count; |
| } |
| } |
| |
| // Check that CFI is set up in module constructors and destructors. |
| struct A { |
| void check_cfi_self() { |
| g_last_type_id = 0; |
| assert(&__cfi_slowpath); |
| // CFI check for an address inside this DSO. This goes to the current module's __cfi_check, |
| // which updates g_last_type_id. |
| __cfi_slowpath(13, static_cast<void*>(&g_last_type_id)); |
| assert(g_last_type_id == 13); |
| // CFI check for a libc function. This never goes into this module's __cfi_check, and must pass. |
| __cfi_slowpath(14, reinterpret_cast<void*>(&exit)); |
| assert(g_last_type_id == 13); |
| } |
| A() { |
| check_cfi_self(); |
| } |
| ~A() { |
| check_cfi_self(); |
| } |
| } a; |