1 // Copyright 2022 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/memory/raw_ptr_asan_bound_arg_tracker.h" 6 7 #include "base/allocator/partition_allocator/partition_alloc_buildflags.h" 8 9 #if BUILDFLAG(USE_ASAN_BACKUP_REF_PTR) 10 11 #include <sanitizer/allocator_interface.h> 12 #include <sanitizer/asan_interface.h> 13 14 #include "base/memory/raw_ptr_asan_service.h" 15 #include "third_party/abseil-cpp/absl/base/attributes.h" 16 17 namespace base { 18 19 namespace { 20 21 // We use thread-local storage instead of sequence-local storage for consistency 22 // with PendingReport in RawPtrAsanService. 23 ABSL_CONST_INIT thread_local RawPtrAsanBoundArgTracker::ProtectedArgsVector* 24 protected_args = nullptr; 25 26 } // namespace 27 28 // static GetProtectedArgPtr(uintptr_t ptr)29uintptr_t RawPtrAsanBoundArgTracker::GetProtectedArgPtr(uintptr_t ptr) { 30 if (!protected_args) { 31 return 0; 32 } 33 34 for (auto protected_arg_ptr : *protected_args) { 35 uintptr_t allocation_base = 0; 36 size_t allocation_size = 0; 37 __asan_locate_address(reinterpret_cast<void*>(protected_arg_ptr), nullptr, 38 0, reinterpret_cast<void**>(&allocation_base), 39 &allocation_size); 40 if (allocation_base <= ptr && ptr < allocation_base + allocation_size) { 41 return allocation_base; 42 } 43 } 44 45 return 0; 46 } 47 RawPtrAsanBoundArgTracker()48RawPtrAsanBoundArgTracker::RawPtrAsanBoundArgTracker() 49 : enabled_(RawPtrAsanService::GetInstance().IsEnabled()) { 50 if (enabled_) { 51 prev_protected_args_ = protected_args; 52 protected_args = &protected_args_; 53 } 54 } 55 ~RawPtrAsanBoundArgTracker()56RawPtrAsanBoundArgTracker::~RawPtrAsanBoundArgTracker() { 57 if (enabled_) { 58 protected_args = prev_protected_args_; 59 } 60 } 61 Add(uintptr_t ptr)62void RawPtrAsanBoundArgTracker::Add(uintptr_t ptr) { 63 if (ptr) { 64 protected_args_->push_back(ptr); 65 } 66 } 67 68 } // namespace base 69 70 #endif // BUILDFLAG(USE_ASAN_BACKUP_REF_PTR) 71