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 <dlfcn.h> 18 #include <gtest/gtest.h> 19 #include <sys/stat.h> 20 21 #include "BionicDeathTest.h" 22 #include "gtest_globals.h" 23 #include "utils.h" 24 25 // Private libdl interface. 26 extern "C" { 27 void __cfi_slowpath(uint64_t CallSiteTypeId, void* Ptr); 28 void __cfi_slowpath_diag(uint64_t CallSiteTypeId, void* Ptr, void* DiagData); 29 } 30 31 static void f() {} 32 33 TEST(cfi_test, basic) { 34 #if defined(__BIONIC__) 35 void* handle; 36 handle = dlopen("libcfi-test.so", RTLD_NOW | RTLD_LOCAL); 37 ASSERT_TRUE(handle != nullptr) << dlerror(); 38 39 #define SYM(type, name) auto name = reinterpret_cast<type>(dlsym(handle, #name)) 40 SYM(int (*)(), get_count); 41 SYM(uint64_t(*)(), get_last_type_id); 42 SYM(void* (*)(), get_last_address); 43 SYM(void* (*)(), get_last_diag); 44 SYM(void* (*)(), get_global_address); 45 SYM(void (*)(uint64_t, void*, void*), __cfi_check); 46 #undef SYM 47 48 int c = get_count(); 49 50 // CFI check for code inside the DSO. Can't use just any function address - this is only 51 // guaranteed to work for code addresses above __cfi_check. 52 void* code_ptr = reinterpret_cast<char*>(__cfi_check) + 1234; 53 void* diag_ptr = reinterpret_cast<void*>(5678); 54 __cfi_slowpath_diag(42, code_ptr, diag_ptr); 55 EXPECT_EQ(42U, get_last_type_id()); 56 EXPECT_EQ(code_ptr, get_last_address()); 57 EXPECT_EQ(diag_ptr, get_last_diag()); 58 EXPECT_EQ(++c, get_count()); 59 60 // __cfi_slowpath passes nullptr for the Diag argument. 61 __cfi_slowpath(42, code_ptr); 62 EXPECT_EQ(42U, get_last_type_id()); 63 EXPECT_EQ(code_ptr, get_last_address()); 64 EXPECT_EQ(nullptr, get_last_diag()); 65 EXPECT_EQ(++c, get_count()); 66 67 // CFI check for a data address inside the DSO. 68 __cfi_slowpath(43, get_global_address()); 69 EXPECT_EQ(43U, get_last_type_id()); 70 EXPECT_EQ(get_global_address(), get_last_address()); 71 EXPECT_EQ(++c, get_count()); 72 73 // CFI check for a function inside _this_ DSO. It either goes to this DSO's __cfi_check, 74 // or (if missing) is simply ignored. Any way, it does not affect the test lib's counters. 75 __cfi_slowpath(44, reinterpret_cast<void*>(&f)); 76 EXPECT_EQ(43U, get_last_type_id()); 77 EXPECT_EQ(get_global_address(), get_last_address()); 78 EXPECT_EQ(c, get_count()); 79 80 // CFI check for a stack address. This is always invalid and gets the process killed. 81 EXPECT_DEATH(__cfi_slowpath(45, reinterpret_cast<void*>(&c)), ""); 82 83 // CFI check for a heap address. This is always invalid and gets the process killed. 84 void* p = malloc(4096); 85 EXPECT_DEATH(__cfi_slowpath(46, p), ""); 86 free(p); 87 88 // Load the same library again. 89 void* handle2 = dlopen("libcfi-test.so", RTLD_NOW | RTLD_LOCAL); 90 ASSERT_TRUE(handle2 != nullptr) << dlerror(); 91 EXPECT_EQ(handle2, handle); 92 93 // Check that it is still there. 94 __cfi_slowpath(43, get_global_address()); 95 EXPECT_EQ(43U, get_last_type_id()); 96 EXPECT_EQ(get_global_address(), get_last_address()); 97 EXPECT_EQ(++c, get_count()); 98 99 dlclose(handle); 100 dlclose(handle2); 101 102 // CFI check for a function inside the unloaded DSO. This is always invalid and gets the process 103 // killed. 104 EXPECT_DEATH(__cfi_slowpath(45, reinterpret_cast<void*>(code_ptr)), ""); 105 #endif 106 } 107 108 TEST(cfi_test, invalid) { 109 #if defined(__BIONIC__) 110 void* handle; 111 handle = dlopen("libcfi-test-bad.so", RTLD_NOW | RTLD_LOCAL); 112 ASSERT_FALSE(handle != nullptr) << dlerror(); 113 114 handle = dlopen("libcfi-test-bad.so", RTLD_NOW | RTLD_LOCAL); 115 ASSERT_FALSE(handle != nullptr) << dlerror(); 116 #endif 117 } 118 119 // cfi_test_helper exports __cfi_check, which triggers CFI initialization at startup. 120 TEST(cfi_test, early_init) { 121 #if defined(__BIONIC__) 122 std::string helper = get_testlib_root() + "/cfi_test_helper/cfi_test_helper"; 123 chmod(helper.c_str(), 0755); // TODO: "x" lost in CTS, b/34945607 124 ExecTestHelper eth; 125 eth.SetArgs({ helper.c_str(), nullptr }); 126 eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, nullptr); 127 #endif 128 } 129 130 // cfi_test_helper2 depends on a library that exports __cfi_check, which triggers CFI initialization 131 // at startup. 132 TEST(cfi_test, early_init2) { 133 #if defined(__BIONIC__) 134 std::string helper = get_testlib_root() + "/cfi_test_helper2/cfi_test_helper2"; 135 chmod(helper.c_str(), 0755); // TODO: "x" lost in CTS, b/34945607 136 ExecTestHelper eth; 137 eth.SetArgs({ helper.c_str(), nullptr }); 138 eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, nullptr); 139 #endif 140 } 141
