1 //===-- sanitizer_wrappers.cpp ----------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // Redirect some functions to sanitizer interceptors. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include <dlfcn.h> 14 #include <errno.h> 15 #include <fcntl.h> 16 #include <inttypes.h> 17 #include <stdarg.h> 18 #include <stdio.h> 19 #include <unistd.h> 20 21 #include <tuple> 22 23 namespace __sanitizer { 24 unsigned long internal_open(const char *filename, int flags); 25 unsigned long internal_open(const char *filename, int flags, unsigned mode); 26 unsigned long internal_close(int fd); 27 unsigned long internal_stat(const char *path, void *buf); 28 unsigned long internal_lstat(const char *path, void *buf); 29 unsigned long internal_fstat(int fd, void *buf); 30 size_t internal_strlen(const char *s); 31 unsigned long internal_mmap(void *addr, uintptr_t length, int prot, int flags, 32 int fd, unsigned long long offset); 33 void *internal_memcpy(void *dest, const void *src, unsigned long n); 34 // Used to propagate errno. 35 bool internal_iserror(uintptr_t retval, int *rverrno = 0); 36 } // namespace __sanitizer 37 38 namespace { 39 40 template <typename T> 41 struct GetTypes; 42 43 template <typename R, typename... Args> 44 struct GetTypes<R(Args...)> { 45 using Result = R; 46 template <size_t i> 47 struct Arg { 48 using Type = typename std::tuple_element<i, std::tuple<Args...>>::type; 49 }; 50 }; 51 52 #define LLVM_SYMBOLIZER_GET_FUNC(Function) \ 53 ((__interceptor_##Function) \ 54 ? (__interceptor_##Function) \ 55 : reinterpret_cast<decltype(&Function)>(dlsym(RTLD_NEXT, #Function))) 56 57 #define LLVM_SYMBOLIZER_INTERCEPTOR1(Function, ...) \ 58 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 59 GetTypes<__VA_ARGS__>::Arg<0>::Type) __attribute__((weak)); \ 60 GetTypes<__VA_ARGS__>::Result Function( \ 61 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0) { \ 62 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0); \ 63 } 64 65 #define LLVM_SYMBOLIZER_INTERCEPTOR2(Function, ...) \ 66 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 67 GetTypes<__VA_ARGS__>::Arg<0>::Type, \ 68 GetTypes<__VA_ARGS__>::Arg<1>::Type) __attribute__((weak)); \ 69 GetTypes<__VA_ARGS__>::Result Function( \ 70 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0, \ 71 GetTypes<__VA_ARGS__>::Arg<1>::Type arg1) { \ 72 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1); \ 73 } 74 75 #define LLVM_SYMBOLIZER_INTERCEPTOR3(Function, ...) \ 76 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 77 GetTypes<__VA_ARGS__>::Arg<0>::Type, \ 78 GetTypes<__VA_ARGS__>::Arg<1>::Type, \ 79 GetTypes<__VA_ARGS__>::Arg<2>::Type) __attribute__((weak)); \ 80 GetTypes<__VA_ARGS__>::Result Function( \ 81 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0, \ 82 GetTypes<__VA_ARGS__>::Arg<1>::Type arg1, \ 83 GetTypes<__VA_ARGS__>::Arg<2>::Type arg2) { \ 84 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1, arg2); \ 85 } 86 87 #define LLVM_SYMBOLIZER_INTERCEPTOR4(Function, ...) \ 88 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 89 GetTypes<__VA_ARGS__>::Arg<0>::Type, \ 90 GetTypes<__VA_ARGS__>::Arg<1>::Type, \ 91 GetTypes<__VA_ARGS__>::Arg<2>::Type, \ 92 GetTypes<__VA_ARGS__>::Arg<3>::Type) __attribute__((weak)); \ 93 GetTypes<__VA_ARGS__>::Result Function( \ 94 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0, \ 95 GetTypes<__VA_ARGS__>::Arg<1>::Type arg1, \ 96 GetTypes<__VA_ARGS__>::Arg<2>::Type arg2, \ 97 GetTypes<__VA_ARGS__>::Arg<3>::Type arg3) { \ 98 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1, arg2, arg3); \ 99 } 100 101 } // namespace 102 103 // C-style interface around internal sanitizer libc functions. 104 extern "C" { 105 106 #define RETURN_OR_SET_ERRNO(T, res) \ 107 int rverrno; \ 108 if (__sanitizer::internal_iserror(res, &rverrno)) { \ 109 errno = rverrno; \ 110 return (T)-1; \ 111 } \ 112 return (T)res; 113 114 int open(const char *filename, int flags, ...) { 115 unsigned long res; 116 if (flags | O_CREAT) { 117 va_list va; 118 va_start(va, flags); 119 unsigned mode = va_arg(va, unsigned); 120 va_end(va); 121 res = __sanitizer::internal_open(filename, flags, mode); 122 } else { 123 res = __sanitizer::internal_open(filename, flags); 124 } 125 RETURN_OR_SET_ERRNO(int, res); 126 } 127 128 int close(int fd) { 129 unsigned long res = __sanitizer::internal_close(fd); 130 RETURN_OR_SET_ERRNO(int, res); 131 } 132 133 #define STAT(func, arg, buf) \ 134 unsigned long res = __sanitizer::internal_##func(arg, buf); \ 135 RETURN_OR_SET_ERRNO(int, res); 136 137 int stat(const char *path, struct stat *buf) { STAT(stat, path, buf); } 138 139 int lstat(const char *path, struct stat *buf) { STAT(lstat, path, buf); } 140 141 int fstat(int fd, struct stat *buf) { STAT(fstat, fd, buf); } 142 143 // Redirect versioned stat functions to the __sanitizer::internal() as well. 144 int __xstat(int version, const char *path, struct stat *buf) { 145 STAT(stat, path, buf); 146 } 147 148 int __lxstat(int version, const char *path, struct stat *buf) { 149 STAT(lstat, path, buf); 150 } 151 152 int __fxstat(int version, int fd, struct stat *buf) { STAT(fstat, fd, buf); } 153 154 size_t strlen(const char *s) { return __sanitizer::internal_strlen(s); } 155 156 void *mmap(void *addr, size_t length, int prot, int flags, int fd, 157 off_t offset) { 158 unsigned long res = 159 __sanitizer::internal_mmap(addr, length, prot, flags, fd, offset); 160 RETURN_OR_SET_ERRNO(void *, res); 161 } 162 163 LLVM_SYMBOLIZER_INTERCEPTOR3(read, ssize_t(int, void *, size_t)) 164 LLVM_SYMBOLIZER_INTERCEPTOR4(pread, ssize_t(int, void *, size_t, off_t)) 165 LLVM_SYMBOLIZER_INTERCEPTOR4(pread64, ssize_t(int, void *, size_t, off64_t)) 166 LLVM_SYMBOLIZER_INTERCEPTOR2(realpath, char *(const char *, char *)) 167 168 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_cond_broadcast, int(pthread_cond_t *)) 169 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_cond_wait, 170 int(pthread_cond_t *, pthread_mutex_t *)) 171 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutex_lock, int(pthread_mutex_t *)) 172 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutex_unlock, int(pthread_mutex_t *)) 173 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutex_destroy, int(pthread_mutex_t *)) 174 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_mutex_init, 175 int(pthread_mutex_t *, 176 const pthread_mutexattr_t *)) 177 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutexattr_destroy, 178 int(pthread_mutexattr_t *)) 179 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutexattr_init, int(pthread_mutexattr_t *)) 180 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_mutexattr_settype, 181 int(pthread_mutexattr_t *, int)) 182 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_getspecific, void *(pthread_key_t)) 183 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_key_create, 184 int(pthread_key_t *, void (*)(void *))) 185 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_once, 186 int(pthread_once_t *, void (*)(void))) 187 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_setspecific, 188 int(pthread_key_t, const void *)) 189 LLVM_SYMBOLIZER_INTERCEPTOR3(pthread_sigmask, 190 int(int, const sigset_t *, sigset_t *)) 191 192 } // extern "C" 193