1//===-- dfsan.h -------------------------------------------------*- 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// This file is a part of DataFlowSanitizer. 10// 11// Private DFSan header. 12//===----------------------------------------------------------------------===// 13 14#ifndef DFSAN_H 15#define DFSAN_H 16 17#include "sanitizer_common/sanitizer_internal_defs.h" 18 19#include "dfsan_platform.h" 20 21using __sanitizer::u32; 22using __sanitizer::u8; 23using __sanitizer::uptr; 24 25// Copy declarations from public sanitizer/dfsan_interface.h header here. 26typedef u8 dfsan_label; 27typedef u32 dfsan_origin; 28 29extern "C" { 30void dfsan_add_label(dfsan_label label, void *addr, uptr size); 31void dfsan_set_label(dfsan_label label, void *addr, uptr size); 32dfsan_label dfsan_read_label(const void *addr, uptr size); 33dfsan_label dfsan_union(dfsan_label l1, dfsan_label l2); 34// Zero out [offset, offset+size) from __dfsan_arg_tls. 35void dfsan_clear_arg_tls(uptr offset, uptr size); 36// Zero out the TLS storage. 37void dfsan_clear_thread_local_state(); 38 39// Set DFSan label and origin TLS of argument for a call. 40// Note that offset may not correspond with argument number. 41// Some arguments (aggregate/array) will use several offsets. 42void dfsan_set_arg_tls(uptr offset, dfsan_label label); 43void dfsan_set_arg_origin_tls(uptr offset, dfsan_origin o); 44 45// Return the origin associated with the first taint byte in the size bytes 46// from the address addr. 47dfsan_origin dfsan_read_origin_of_first_taint(const void *addr, uptr size); 48 49// Set the data within [addr, addr+size) with label and origin. 50void dfsan_set_label_origin(dfsan_label label, dfsan_origin origin, void *addr, 51 uptr size); 52 53// Copy or move the origins of the len bytes from src to dst. 54void dfsan_mem_origin_transfer(const void *dst, const void *src, uptr len); 55 56// Copy shadow bytes from src to dst. 57// Note this preserves distinct taint labels at specific offsets. 58void dfsan_mem_shadow_transfer(void *dst, const void *src, uptr len); 59} // extern "C" 60 61template <typename T> 62void dfsan_set_label(dfsan_label label, T &data) { 63 dfsan_set_label(label, (void *)&data, sizeof(T)); 64} 65 66namespace __dfsan { 67 68extern bool dfsan_inited; 69extern bool dfsan_init_is_running; 70 71void initialize_interceptors(); 72 73inline dfsan_label *shadow_for(void *ptr) { 74 return (dfsan_label *)MEM_TO_SHADOW(ptr); 75} 76 77inline const dfsan_label *shadow_for(const void *ptr) { 78 return shadow_for(const_cast<void *>(ptr)); 79} 80 81inline uptr unaligned_origin_for(uptr ptr) { return MEM_TO_ORIGIN(ptr); } 82 83inline dfsan_origin *origin_for(void *ptr) { 84 auto aligned_addr = unaligned_origin_for(reinterpret_cast<uptr>(ptr)) & 85 ~(sizeof(dfsan_origin) - 1); 86 return reinterpret_cast<dfsan_origin *>(aligned_addr); 87} 88 89inline const dfsan_origin *origin_for(const void *ptr) { 90 return origin_for(const_cast<void *>(ptr)); 91} 92 93void dfsan_copy_memory(void *dst, const void *src, uptr size); 94 95void dfsan_allocator_init(); 96void dfsan_deallocate(void *ptr); 97 98void *dfsan_malloc(uptr size); 99void *dfsan_calloc(uptr nmemb, uptr size); 100void *dfsan_realloc(void *ptr, uptr size); 101void *dfsan_reallocarray(void *ptr, uptr nmemb, uptr size); 102void *dfsan_valloc(uptr size); 103void *dfsan_pvalloc(uptr size); 104void *dfsan_aligned_alloc(uptr alignment, uptr size); 105void *dfsan_memalign(uptr alignment, uptr size); 106int dfsan_posix_memalign(void **memptr, uptr alignment, uptr size); 107 108void dfsan_init(); 109 110} // namespace __dfsan 111 112#endif // DFSAN_H 113