1 //===-- sanitizer_wrappers.cc -----------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Redirect some functions to sanitizer interceptors. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include <dlfcn.h> 15 #include <errno.h> 16 #include <fcntl.h> 17 #include <stdarg.h> 18 #include <stdio.h> 19 #include <unistd.h> 20 21 #include <tuple> 22 23 // Need to match ../sanitizer_common/sanitizer_internal_defs.h 24 #if defined(ARCH_PPC) 25 #define OFF_T unsigned long 26 #else 27 #define OFF_T unsigned long long 28 #endif 29 30 namespace __sanitizer { 31 unsigned long internal_open(const char *filename, int flags); 32 unsigned long internal_open(const char *filename, int flags, unsigned mode); 33 unsigned long internal_close(int fd); 34 unsigned long internal_stat(const char *path, void *buf); 35 unsigned long internal_lstat(const char *path, void *buf); 36 unsigned long internal_fstat(int fd, void *buf); 37 size_t internal_strlen(const char *s); 38 unsigned long internal_mmap(void *addr, unsigned long length, int prot, 39 int flags, int fd, OFF_T offset); 40 void *internal_memcpy(void *dest, const void *src, unsigned long n); 41 // Used to propagate errno. 42 bool internal_iserror(unsigned long retval, int *rverrno = 0); 43 } // namespace __sanitizer 44 45 namespace { 46 47 template <typename T> 48 struct GetTypes; 49 50 template <typename R, typename... Args> 51 struct GetTypes<R(Args...)> { 52 using Result = R; 53 template <size_t i> 54 struct Arg { 55 using Type = typename std::tuple_element<i, std::tuple<Args...>>::type; 56 }; 57 }; 58 59 #define LLVM_SYMBOLIZER_GET_FUNC(Function) \ 60 ((__interceptor_##Function) \ 61 ? (__interceptor_##Function) \ 62 : reinterpret_cast<decltype(&Function)>(dlsym(RTLD_NEXT, #Function))) 63 64 #define LLVM_SYMBOLIZER_INTERCEPTOR1(Function, ...) \ 65 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 66 GetTypes<__VA_ARGS__>::Arg<0>::Type) __attribute__((weak)); \ 67 GetTypes<__VA_ARGS__>::Result Function( \ 68 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0) { \ 69 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0); \ 70 } 71 72 #define LLVM_SYMBOLIZER_INTERCEPTOR2(Function, ...) \ 73 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 74 GetTypes<__VA_ARGS__>::Arg<0>::Type, \ 75 GetTypes<__VA_ARGS__>::Arg<1>::Type) __attribute__((weak)); \ 76 GetTypes<__VA_ARGS__>::Result Function( \ 77 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0, \ 78 GetTypes<__VA_ARGS__>::Arg<1>::Type arg1) { \ 79 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1); \ 80 } 81 82 #define LLVM_SYMBOLIZER_INTERCEPTOR3(Function, ...) \ 83 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 84 GetTypes<__VA_ARGS__>::Arg<0>::Type, \ 85 GetTypes<__VA_ARGS__>::Arg<1>::Type, \ 86 GetTypes<__VA_ARGS__>::Arg<2>::Type) __attribute__((weak)); \ 87 GetTypes<__VA_ARGS__>::Result Function( \ 88 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0, \ 89 GetTypes<__VA_ARGS__>::Arg<1>::Type arg1, \ 90 GetTypes<__VA_ARGS__>::Arg<2>::Type arg2) { \ 91 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1, arg2); \ 92 } 93 94 #define LLVM_SYMBOLIZER_INTERCEPTOR4(Function, ...) \ 95 GetTypes<__VA_ARGS__>::Result __interceptor_##Function( \ 96 GetTypes<__VA_ARGS__>::Arg<0>::Type, \ 97 GetTypes<__VA_ARGS__>::Arg<1>::Type, \ 98 GetTypes<__VA_ARGS__>::Arg<2>::Type, \ 99 GetTypes<__VA_ARGS__>::Arg<3>::Type) __attribute__((weak)); \ 100 GetTypes<__VA_ARGS__>::Result Function( \ 101 GetTypes<__VA_ARGS__>::Arg<0>::Type arg0, \ 102 GetTypes<__VA_ARGS__>::Arg<1>::Type arg1, \ 103 GetTypes<__VA_ARGS__>::Arg<2>::Type arg2, \ 104 GetTypes<__VA_ARGS__>::Arg<3>::Type arg3) { \ 105 return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1, arg2, arg3); \ 106 } 107 108 } // namespace 109 110 // C-style interface around internal sanitizer libc functions. 111 extern "C" { 112 113 #define RETURN_OR_SET_ERRNO(T, res) \ 114 int rverrno; \ 115 if (__sanitizer::internal_iserror(res, &rverrno)) { \ 116 errno = rverrno; \ 117 return (T)-1; \ 118 } \ 119 return (T)res; 120 121 int open(const char *filename, int flags, ...) { 122 unsigned long res; 123 if (flags | O_CREAT) { 124 va_list va; 125 va_start(va, flags); 126 unsigned mode = va_arg(va, unsigned); 127 va_end(va); 128 res = __sanitizer::internal_open(filename, flags, mode); 129 } else { 130 res = __sanitizer::internal_open(filename, flags); 131 } 132 RETURN_OR_SET_ERRNO(int, res); 133 } 134 135 int close(int fd) { 136 unsigned long res = __sanitizer::internal_close(fd); 137 RETURN_OR_SET_ERRNO(int, res); 138 } 139 140 #define STAT(func, arg, buf) \ 141 unsigned long res = __sanitizer::internal_##func(arg, buf); \ 142 RETURN_OR_SET_ERRNO(int, res); 143 144 int stat(const char *path, struct stat *buf) { STAT(stat, path, buf); } 145 146 int lstat(const char *path, struct stat *buf) { STAT(lstat, path, buf); } 147 148 int fstat(int fd, struct stat *buf) { STAT(fstat, fd, buf); } 149 150 // Redirect versioned stat functions to the __sanitizer::internal() as well. 151 int __xstat(int version, const char *path, struct stat *buf) { 152 STAT(stat, path, buf); 153 } 154 155 int __lxstat(int version, const char *path, struct stat *buf) { 156 STAT(lstat, path, buf); 157 } 158 159 int __fxstat(int version, int fd, struct stat *buf) { STAT(fstat, fd, buf); } 160 161 size_t strlen(const char *s) { return __sanitizer::internal_strlen(s); } 162 163 void *mmap(void *addr, size_t length, int prot, int flags, int fd, 164 off_t offset) { 165 unsigned long res = __sanitizer::internal_mmap( 166 addr, (unsigned long)length, prot, flags, fd, (unsigned long long)offset); 167 RETURN_OR_SET_ERRNO(void *, res); 168 } 169 170 LLVM_SYMBOLIZER_INTERCEPTOR3(read, ssize_t(int, void *, size_t)) 171 LLVM_SYMBOLIZER_INTERCEPTOR4(pread, ssize_t(int, void *, size_t, off_t)) 172 LLVM_SYMBOLIZER_INTERCEPTOR4(pread64, ssize_t(int, void *, size_t, off64_t)) 173 LLVM_SYMBOLIZER_INTERCEPTOR2(realpath, char *(const char *, char *)) 174 175 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_cond_broadcast, int(pthread_cond_t *)) 176 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_cond_wait, 177 int(pthread_cond_t *, pthread_mutex_t *)) 178 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutex_lock, int(pthread_mutex_t *)) 179 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutex_unlock, int(pthread_mutex_t *)) 180 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutex_destroy, int(pthread_mutex_t *)) 181 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_mutex_init, 182 int(pthread_mutex_t *, 183 const pthread_mutexattr_t *)) 184 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutexattr_destroy, 185 int(pthread_mutexattr_t *)) 186 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_mutexattr_init, int(pthread_mutexattr_t *)) 187 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_mutexattr_settype, 188 int(pthread_mutexattr_t *, int)) 189 LLVM_SYMBOLIZER_INTERCEPTOR1(pthread_getspecific, void *(pthread_key_t)) 190 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_key_create, 191 int(pthread_key_t *, void (*)(void *))) 192 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_once, 193 int(pthread_once_t *, void (*)(void))) 194 LLVM_SYMBOLIZER_INTERCEPTOR2(pthread_setspecific, 195 int(pthread_key_t, const void *)) 196 LLVM_SYMBOLIZER_INTERCEPTOR3(pthread_sigmask, 197 int(int, const sigset_t *, sigset_t *)) 198 199 } // extern "C" 200
Indexes created Sat Sep 20 22:09:52 GMT 2025