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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-exception6//7//===----------------------------------------------------------------------===//8//9// This file is a part of DataFlowSanitizer.10//11// Private DFSan header.12//===----------------------------------------------------------------------===//13 14#ifndef DFSAN_H15#define DFSAN_H16 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 bytes46// 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 __dfsan111 112#endif // DFSAN_H113