| //===-- dfsan.h -------------------------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of DataFlowSanitizer. |
| // |
| // Private DFSan header. |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef DFSAN_H |
| #define DFSAN_H |
| |
| #include "sanitizer_common/sanitizer_internal_defs.h" |
| |
| #include "dfsan_flags.h" |
| #include "dfsan_platform.h" |
| |
| using __sanitizer::u16; |
| using __sanitizer::u32; |
| using __sanitizer::uptr; |
| |
| // Copy declarations from public sanitizer/dfsan_interface.h header here. |
| typedef u16 dfsan_label; |
| typedef u32 dfsan_origin; |
| |
| struct dfsan_label_info { |
| dfsan_label l1; |
| dfsan_label l2; |
| const char *desc; |
| void *userdata; |
| }; |
| |
| extern "C" { |
| void dfsan_add_label(dfsan_label label, void *addr, uptr size); |
| void dfsan_set_label(dfsan_label label, void *addr, uptr size); |
| dfsan_label dfsan_read_label(const void *addr, uptr size); |
| dfsan_label dfsan_union(dfsan_label l1, dfsan_label l2); |
| // Zero out [offset, offset+size) from __dfsan_arg_tls. |
| void dfsan_clear_arg_tls(uptr offset, uptr size); |
| // Zero out the TLS storage. |
| void dfsan_clear_thread_local_state(); |
| } // extern "C" |
| |
| template <typename T> |
| void dfsan_set_label(dfsan_label label, T &data) { // NOLINT |
| dfsan_set_label(label, (void *)&data, sizeof(T)); |
| } |
| |
| namespace __dfsan { |
| |
| void InitializeInterceptors(); |
| |
| inline dfsan_label *shadow_for(void *ptr) { |
| return (dfsan_label *) ((((uptr) ptr) & ShadowMask()) << 1); |
| } |
| |
| inline const dfsan_label *shadow_for(const void *ptr) { |
| return shadow_for(const_cast<void *>(ptr)); |
| } |
| |
| inline uptr unaligned_origin_for(uptr ptr) { |
| return OriginAddr() + (ptr & ShadowMask()); |
| } |
| |
| inline dfsan_origin *origin_for(void *ptr) { |
| auto aligned_addr = unaligned_origin_for(reinterpret_cast<uptr>(ptr)) & |
| ~(sizeof(dfsan_origin) - 1); |
| return reinterpret_cast<dfsan_origin *>(aligned_addr); |
| } |
| |
| inline const dfsan_origin *origin_for(const void *ptr) { |
| return origin_for(const_cast<void *>(ptr)); |
| } |
| |
| inline bool is_shadow_addr_valid(uptr shadow_addr) { |
| return (uptr)shadow_addr >= ShadowAddr() && (uptr)shadow_addr < OriginAddr(); |
| } |
| |
| inline bool has_valid_shadow_addr(const void *ptr) { |
| const dfsan_label *ptr_s = shadow_for(ptr); |
| return is_shadow_addr_valid((uptr)ptr_s); |
| } |
| |
| } // namespace __dfsan |
| |
| #endif // DFSAN_H |