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See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // Common part of the public sanitizer interface. //===----------------------------------------------------------------------===// #ifndef SANITIZER_COMMON_INTERFACE_DEFS_H #define SANITIZER_COMMON_INTERFACE_DEFS_H #include #include // GCC does not understand __has_feature. #if !defined(__has_feature) # define __has_feature(x) 0 #endif #ifdef __cplusplus extern "C" { #endif // Arguments for __sanitizer_sandbox_on_notify() below. typedef struct { // Enable sandbox support in sanitizer coverage. int coverage_sandboxed; // File descriptor to write coverage data to. If -1 is passed, a file will // be pre-opened by __sanitizer_sandobx_on_notify(). This field has no // effect if coverage_sandboxed == 0. intptr_t coverage_fd; // If non-zero, split the coverage data into well-formed blocks. This is // useful when coverage_fd is a socket descriptor. Each block will contain // a header, allowing data from multiple processes to be sent over the same // socket. unsigned int coverage_max_block_size; } __sanitizer_sandbox_arguments; // Tell the tools to write their reports to "path." instead of stderr. void __sanitizer_set_report_path(const char *path); // Tell the tools to write their reports to the provided file descriptor // (casted to void *). void __sanitizer_set_report_fd(void *fd); // Notify the tools that the sandbox is going to be turned on. The reserved // parameter will be used in the future to hold a structure with functions // that the tools may call to bypass the sandbox. void __sanitizer_sandbox_on_notify(__sanitizer_sandbox_arguments *args); // This function is called by the tool when it has just finished reporting // an error. 'error_summary' is a one-line string that summarizes // the error message. This function can be overridden by the client. void __sanitizer_report_error_summary(const char *error_summary); // Some of the sanitizers (e.g. asan/tsan) may miss bugs that happen // in unaligned loads/stores. In order to find such bugs reliably one needs // to replace plain unaligned loads/stores with these calls. uint16_t __sanitizer_unaligned_load16(const void *p); uint32_t __sanitizer_unaligned_load32(const void *p); uint64_t __sanitizer_unaligned_load64(const void *p); void __sanitizer_unaligned_store16(void *p, uint16_t x); void __sanitizer_unaligned_store32(void *p, uint32_t x); void __sanitizer_unaligned_store64(void *p, uint64_t x); // Returns 1 on the first call, then returns 0 thereafter. Called by the tool // to ensure only one report is printed when multiple errors occur // simultaneously. int __sanitizer_acquire_crash_state(); // Annotate the current state of a contiguous container, such as // std::vector, std::string or similar. // A contiguous container is a container that keeps all of its elements // in a contiguous region of memory. The container owns the region of memory // [beg, end); the memory [beg, mid) is used to store the current elements // and the memory [mid, end) is reserved for future elements; // beg <= mid <= end. For example, in "std::vector<> v" // beg = &v[0]; // end = beg + v.capacity() * sizeof(v[0]); // mid = beg + v.size() * sizeof(v[0]); // // This annotation tells the Sanitizer tool about the current state of the // container so that the tool can report errors when memory from [mid, end) // is accessed. Insert this annotation into methods like push_back/pop_back. // Supply the old and the new values of mid (old_mid/new_mid). // In the initial state mid == end and so should be the final // state when the container is destroyed or when it reallocates the storage. // // Use with caution and don't use for anything other than vector-like classes. // // For AddressSanitizer, 'beg' should be 8-aligned and 'end' should // be either 8-aligned or it should point to the end of a separate heap-, // stack-, or global- allocated buffer. I.e. the following will not work: // int64_t x[2]; // 16 bytes, 8-aligned. // char *beg = (char *)&x[0]; // char *end = beg + 12; // Not 8 aligned, not the end of the buffer. // This however will work fine: // int32_t x[3]; // 12 bytes, but 8-aligned under AddressSanitizer. // char *beg = (char*)&x[0]; // char *end = beg + 12; // Not 8-aligned, but is the end of the buffer. void __sanitizer_annotate_contiguous_container(const void *beg, const void *end, const void *old_mid, const void *new_mid); // Returns true if the contiguous container [beg, end) is properly poisoned // (e.g. with __sanitizer_annotate_contiguous_container), i.e. if // - [beg, mid) is addressable, // - [mid, end) is unaddressable. // Full verification requires O(end-beg) time; this function tries to avoid // such complexity by touching only parts of the container around beg/mid/end. int __sanitizer_verify_contiguous_container(const void *beg, const void *mid, const void *end); // Similar to __sanitizer_verify_contiguous_container but returns the address // of the first improperly poisoned byte otherwise. Returns null if the area // is poisoned properly. const void *__sanitizer_contiguous_container_find_bad_address( const void *beg, const void *mid, const void *end); // Print the stack trace leading to this call. Useful for debugging user code. void __sanitizer_print_stack_trace(void); // Symbolizes the supplied 'pc' using the format string 'fmt'. // Outputs at most 'out_buf_size' bytes into 'out_buf'. // If 'out_buf' is not empty then output is zero or more non empty C strings // followed by single empty C string. Multiple strings can be returned if PC // corresponds to inlined function. Inlined frames are printed in the order // from "most-inlined" to the "least-inlined", so the last frame should be the // not inlined function. // Inlined frames can be removed with 'symbolize_inline_frames=0'. // The format syntax is described in // lib/sanitizer_common/sanitizer_stacktrace_printer.h. void __sanitizer_symbolize_pc(void *pc, const char *fmt, char *out_buf, size_t out_buf_size); // Same as __sanitizer_symbolize_pc, but for data section (i.e. globals). void __sanitizer_symbolize_global(void *data_ptr, const char *fmt, char *out_buf, size_t out_buf_size); // Sets the callback to be called right before death on error. // Passing 0 will unset the callback. void __sanitizer_set_death_callback(void (*callback)(void)); // Interceptor hooks. // Whenever a libc function interceptor is called it checks if the // corresponding weak hook is defined, and it so -- calls it. // The primary use case is data-flow-guided fuzzing, where the fuzzer needs // to know what is being passed to libc functions, e.g. memcmp. // FIXME: implement more hooks. void __sanitizer_weak_hook_memcmp(void *called_pc, const void *s1, const void *s2, size_t n, int result); void __sanitizer_weak_hook_strncmp(void *called_pc, const char *s1, const char *s2, size_t n, int result); void __sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1, const char *s2, size_t n, int result); void __sanitizer_weak_hook_strcmp(void *called_pc, const char *s1, const char *s2, int result); void __sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1, const char *s2, int result); void __sanitizer_weak_hook_strstr(void *called_pc, const char *s1, const char *s2, char *result); void __sanitizer_weak_hook_strcasestr(void *called_pc, const char *s1, const char *s2, char *result); void __sanitizer_weak_hook_memmem(void *called_pc, const void *s1, size_t len1, const void *s2, size_t len2, void *result); // Prints stack traces for all live heap allocations ordered by total // allocation size until `top_percent` of total live heap is shown. // `top_percent` should be between 1 and 100. // At most `max_number_of_contexts` contexts (stack traces) is printed. // Experimental feature currently available only with asan on Linux/x86_64. void __sanitizer_print_memory_profile(size_t top_percent, size_t max_number_of_contexts); // Fiber annotation interface. // Before switching to a different stack, one must call // __sanitizer_start_switch_fiber with a pointer to the bottom of the // destination stack and its size. When code starts running on the new stack, // it must call __sanitizer_finish_switch_fiber to finalize the switch. // The start_switch function takes a void** to store the current fake stack if // there is one (it is needed when detect_stack_use_after_return is enabled). // When restoring a stack, this pointer must be given to the finish_switch // function. In most cases, this void* can be stored on the stack just before // switching. When leaving a fiber definitely, null must be passed as first // argument to the start_switch function so that the fake stack is destroyed. // If you do not want support for stack use-after-return detection, you can // always pass null to these two functions. // Note that the fake stack mechanism is disabled during fiber switch, so if a // signal callback runs during the switch, it will not benefit from the stack // use-after-return detection. void __sanitizer_start_switch_fiber(void **fake_stack_save, const void *bottom, size_t size); void __sanitizer_finish_switch_fiber(void *fake_stack_save, const void **bottom_old, size_t *size_old); // Get full module name and calculate pc offset within it. // Returns 1 if pc belongs to some module, 0 if module was not found. int __sanitizer_get_module_and_offset_for_pc(void *pc, char *module_path, size_t module_path_len, void **pc_offset); #ifdef __cplusplus } // extern "C" #endif #endif // SANITIZER_COMMON_INTERFACE_DEFS_H