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 21 using __sanitizer::u32; 22 using __sanitizer::u8; 23 using __sanitizer::uptr; 24 25 // Copy declarations from public sanitizer/dfsan_interface.h header here. 26 typedef u8 dfsan_label; 27 typedef u32 dfsan_origin; 28 29 extern "C" { 30 void dfsan_add_label(dfsan_label label, void *addr, uptr size); 31 void dfsan_set_label(dfsan_label label, void *addr, uptr size); 32 dfsan_label dfsan_read_label(const void *addr, uptr size); 33 dfsan_label dfsan_union(dfsan_label l1, dfsan_label l2); 34 // Zero out [offset, offset+size) from __dfsan_arg_tls. 35 void dfsan_clear_arg_tls(uptr offset, uptr size); 36 // Zero out the TLS storage. 37 void 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. 42 void dfsan_set_arg_tls(uptr offset, dfsan_label label); 43 void 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. 47 dfsan_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. 50 void 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. 54 void 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. 58 void dfsan_mem_shadow_transfer(void *dst, const void *src, uptr len); 59 } // extern "C" 60 61 template <typename T> 62 void dfsan_set_label(dfsan_label label, T &data) { 63 dfsan_set_label(label, (void *)&data, sizeof(T)); 64 } 65 66 namespace __dfsan { 67 68 extern bool dfsan_inited; 69 extern bool dfsan_init_is_running; 70 71 void initialize_interceptors(); 72 73 inline dfsan_label *shadow_for(void *ptr) { 74 return (dfsan_label *)MEM_TO_SHADOW(ptr); 75 } 76 77 inline const dfsan_label *shadow_for(const void *ptr) { 78 return shadow_for(const_cast<void *>(ptr)); 79 } 80 81 inline uptr unaligned_origin_for(uptr ptr) { return MEM_TO_ORIGIN(ptr); } 82 83 inline 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 89 inline const dfsan_origin *origin_for(const void *ptr) { 90 return origin_for(const_cast<void *>(ptr)); 91 } 92 93 void dfsan_copy_memory(void *dst, const void *src, uptr size); 94 95 void dfsan_allocator_init(); 96 void dfsan_deallocate(void *ptr); 97 98 void *dfsan_malloc(uptr size); 99 void *dfsan_calloc(uptr nmemb, uptr size); 100 void *dfsan_realloc(void *ptr, uptr size); 101 void *dfsan_reallocarray(void *ptr, uptr nmemb, uptr size); 102 void *dfsan_valloc(uptr size); 103 void *dfsan_pvalloc(uptr size); 104 void *dfsan_aligned_alloc(uptr alignment, uptr size); 105 void *dfsan_memalign(uptr alignment, uptr size); 106 int dfsan_posix_memalign(void **memptr, uptr alignment, uptr size); 107 108 void dfsan_init(); 109 110 } // namespace __dfsan 111 112 #endif // DFSAN_H 113