asan_interface.h revision 245614
1//===-- sanitizer/asan_interface.h ------------------------------*- 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// This file is a part of AddressSanitizer, an address sanity checker. 11// 12// This header can be included by the instrumented program to fetch 13// data (mostly allocator statistics) from ASan runtime library. 14//===----------------------------------------------------------------------===// 15#ifndef SANITIZER_ASAN_INTERFACE_H 16#define SANITIZER_ASAN_INTERFACE_H 17 18#include <sanitizer/common_interface_defs.h> 19 20// ----------- ATTENTION ------------- 21// This header should NOT include any other headers from ASan runtime. 22// All functions in this header are extern "C" and start with __asan_. 23 24using __sanitizer::uptr; 25 26extern "C" { 27 // This function should be called at the very beginning of the process, 28 // before any instrumented code is executed and before any call to malloc. 29 void __asan_init() SANITIZER_INTERFACE_ATTRIBUTE; 30 31 // This structure describes an instrumented global variable. 32 struct __asan_global { 33 uptr beg; // The address of the global. 34 uptr size; // The original size of the global. 35 uptr size_with_redzone; // The size with the redzone. 36 const char *name; // Name as a C string. 37 uptr has_dynamic_init; // Non-zero if the global has dynamic initializer. 38 }; 39 40 // These two functions should be called by the instrumented code. 41 // 'globals' is an array of structures describing 'n' globals. 42 void __asan_register_globals(__asan_global *globals, uptr n) 43 SANITIZER_INTERFACE_ATTRIBUTE; 44 void __asan_unregister_globals(__asan_global *globals, uptr n) 45 SANITIZER_INTERFACE_ATTRIBUTE; 46 47 // These two functions should be called before and after dynamic initializers 48 // run, respectively. They should be called with parameters describing all 49 // dynamically initialized globals defined in the calling TU. 50 void __asan_before_dynamic_init(uptr first_addr, uptr last_addr) 51 SANITIZER_INTERFACE_ATTRIBUTE; 52 void __asan_after_dynamic_init() 53 SANITIZER_INTERFACE_ATTRIBUTE; 54 55 // These two functions are used by the instrumented code in the 56 // use-after-return mode. __asan_stack_malloc allocates size bytes of 57 // fake stack and __asan_stack_free poisons it. real_stack is a pointer to 58 // the real stack region. 59 uptr __asan_stack_malloc(uptr size, uptr real_stack) 60 SANITIZER_INTERFACE_ATTRIBUTE; 61 void __asan_stack_free(uptr ptr, uptr size, uptr real_stack) 62 SANITIZER_INTERFACE_ATTRIBUTE; 63 64 // These two functions are used by instrumented code in the 65 // use-after-scope mode. They mark memory for local variables as 66 // unaddressable when they leave scope and addressable before the 67 // function exits. 68 void __asan_poison_stack_memory(uptr addr, uptr size) 69 SANITIZER_INTERFACE_ATTRIBUTE; 70 void __asan_unpoison_stack_memory(uptr addr, uptr size) 71 SANITIZER_INTERFACE_ATTRIBUTE; 72 73 // Marks memory region [addr, addr+size) as unaddressable. 74 // This memory must be previously allocated by the user program. Accessing 75 // addresses in this region from instrumented code is forbidden until 76 // this region is unpoisoned. This function is not guaranteed to poison 77 // the whole region - it may poison only subregion of [addr, addr+size) due 78 // to ASan alignment restrictions. 79 // Method is NOT thread-safe in the sense that no two threads can 80 // (un)poison memory in the same memory region simultaneously. 81 void __asan_poison_memory_region(void const volatile *addr, uptr size) 82 SANITIZER_INTERFACE_ATTRIBUTE; 83 // Marks memory region [addr, addr+size) as addressable. 84 // This memory must be previously allocated by the user program. Accessing 85 // addresses in this region is allowed until this region is poisoned again. 86 // This function may unpoison a superregion of [addr, addr+size) due to 87 // ASan alignment restrictions. 88 // Method is NOT thread-safe in the sense that no two threads can 89 // (un)poison memory in the same memory region simultaneously. 90 void __asan_unpoison_memory_region(void const volatile *addr, uptr size) 91 SANITIZER_INTERFACE_ATTRIBUTE; 92 93 // Performs cleanup before a NoReturn function. Must be called before things 94 // like _exit and execl to avoid false positives on stack. 95 void __asan_handle_no_return() SANITIZER_INTERFACE_ATTRIBUTE; 96 97// User code should use macro instead of functions. 98#if __has_feature(address_sanitizer) 99#define ASAN_POISON_MEMORY_REGION(addr, size) \ 100 __asan_poison_memory_region((addr), (size)) 101#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \ 102 __asan_unpoison_memory_region((addr), (size)) 103#else 104#define ASAN_POISON_MEMORY_REGION(addr, size) \ 105 ((void)(addr), (void)(size)) 106#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \ 107 ((void)(addr), (void)(size)) 108#endif 109 110 // Returns true iff addr is poisoned (i.e. 1-byte read/write access to this 111 // address will result in error report from AddressSanitizer). 112 bool __asan_address_is_poisoned(void const volatile *addr) 113 SANITIZER_INTERFACE_ATTRIBUTE; 114 115 // If at least on byte in [beg, beg+size) is poisoned, return the address 116 // of the first such byte. Otherwise return 0. 117 uptr __asan_region_is_poisoned(uptr beg, uptr size) 118 SANITIZER_INTERFACE_ATTRIBUTE; 119 120 // Print the description of addr (useful when debugging in gdb). 121 void __asan_describe_address(uptr addr) 122 SANITIZER_INTERFACE_ATTRIBUTE; 123 124 // This is an internal function that is called to report an error. 125 // However it is still a part of the interface because users may want to 126 // set a breakpoint on this function in a debugger. 127 void __asan_report_error(uptr pc, uptr bp, uptr sp, 128 uptr addr, bool is_write, uptr access_size) 129 SANITIZER_INTERFACE_ATTRIBUTE; 130 131 // Sets the exit code to use when reporting an error. 132 // Returns the old value. 133 int __asan_set_error_exit_code(int exit_code) 134 SANITIZER_INTERFACE_ATTRIBUTE; 135 136 // Sets the callback to be called right before death on error. 137 // Passing 0 will unset the callback. 138 void __asan_set_death_callback(void (*callback)(void)) 139 SANITIZER_INTERFACE_ATTRIBUTE; 140 141 void __asan_set_error_report_callback(void (*callback)(const char*)) 142 SANITIZER_INTERFACE_ATTRIBUTE; 143 144 // User may provide function that would be called right when ASan detects 145 // an error. This can be used to notice cases when ASan detects an error, but 146 // the program crashes before ASan report is printed. 147 /* OPTIONAL */ void __asan_on_error() 148 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE; 149 150 // User may provide its own implementation for symbolization function. 151 // It should print the description of instruction at address "pc" to 152 // "out_buffer". Description should be at most "out_size" bytes long. 153 // User-specified function should return true if symbolization was 154 // successful. 155 /* OPTIONAL */ bool __asan_symbolize(const void *pc, char *out_buffer, 156 int out_size) 157 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE; 158 159 // Returns the estimated number of bytes that will be reserved by allocator 160 // for request of "size" bytes. If ASan allocator can't allocate that much 161 // memory, returns the maximal possible allocation size, otherwise returns 162 // "size". 163 uptr __asan_get_estimated_allocated_size(uptr size) 164 SANITIZER_INTERFACE_ATTRIBUTE; 165 // Returns true if p was returned by the ASan allocator and 166 // is not yet freed. 167 bool __asan_get_ownership(const void *p) 168 SANITIZER_INTERFACE_ATTRIBUTE; 169 // Returns the number of bytes reserved for the pointer p. 170 // Requires (get_ownership(p) == true) or (p == 0). 171 uptr __asan_get_allocated_size(const void *p) 172 SANITIZER_INTERFACE_ATTRIBUTE; 173 // Number of bytes, allocated and not yet freed by the application. 174 uptr __asan_get_current_allocated_bytes() 175 SANITIZER_INTERFACE_ATTRIBUTE; 176 // Number of bytes, mmaped by asan allocator to fulfill allocation requests. 177 // Generally, for request of X bytes, allocator can reserve and add to free 178 // lists a large number of chunks of size X to use them for future requests. 179 // All these chunks count toward the heap size. Currently, allocator never 180 // releases memory to OS (instead, it just puts freed chunks to free lists). 181 uptr __asan_get_heap_size() 182 SANITIZER_INTERFACE_ATTRIBUTE; 183 // Number of bytes, mmaped by asan allocator, which can be used to fulfill 184 // allocation requests. When a user program frees memory chunk, it can first 185 // fall into quarantine and will count toward __asan_get_free_bytes() later. 186 uptr __asan_get_free_bytes() 187 SANITIZER_INTERFACE_ATTRIBUTE; 188 // Number of bytes in unmapped pages, that are released to OS. Currently, 189 // always returns 0. 190 uptr __asan_get_unmapped_bytes() 191 SANITIZER_INTERFACE_ATTRIBUTE; 192 // Prints accumulated stats to stderr. Used for debugging. 193 void __asan_print_accumulated_stats() 194 SANITIZER_INTERFACE_ATTRIBUTE; 195 196 // This function may be optionally provided by user and should return 197 // a string containing ASan runtime options. See asan_flags.h for details. 198 /* OPTIONAL */ const char* __asan_default_options() 199 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE; 200 201 // Malloc hooks that may be optionally provided by user. 202 // __asan_malloc_hook(ptr, size) is called immediately after 203 // allocation of "size" bytes, which returned "ptr". 204 // __asan_free_hook(ptr) is called immediately before 205 // deallocation of "ptr". 206 /* OPTIONAL */ void __asan_malloc_hook(void *ptr, uptr size) 207 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE; 208 /* OPTIONAL */ void __asan_free_hook(void *ptr) 209 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE; 210} // extern "C" 211 212#endif // SANITIZER_ASAN_INTERFACE_H 213