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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/raw_ptr_asan_bound_arg_tracker.h"
#include "base/allocator/partition_allocator/src/partition_alloc/partition_alloc_buildflags.h"
#if BUILDFLAG(USE_ASAN_BACKUP_REF_PTR)
#include <sanitizer/allocator_interface.h>
#include <sanitizer/asan_interface.h>
#include "base/memory/raw_ptr_asan_service.h"
#include "third_party/abseil-cpp/absl/base/attributes.h"
namespace base {
namespace {
// We use thread-local storage instead of sequence-local storage for consistency
// with PendingReport in RawPtrAsanService.
ABSL_CONST_INIT thread_local RawPtrAsanBoundArgTracker::ProtectedArgsVector*
protected_args = nullptr;
} // namespace
// static
uintptr_t RawPtrAsanBoundArgTracker::GetProtectedArgPtr(uintptr_t ptr) {
if (!protected_args) {
return 0;
}
for (auto protected_arg_ptr : *protected_args) {
uintptr_t allocation_base = 0;
size_t allocation_size = 0;
__asan_locate_address(reinterpret_cast<void*>(protected_arg_ptr), nullptr,
0, reinterpret_cast<void**>(&allocation_base),
&allocation_size);
if (allocation_base <= ptr && ptr < allocation_base + allocation_size) {
return allocation_base;
}
}
return 0;
}
RawPtrAsanBoundArgTracker::RawPtrAsanBoundArgTracker()
: enabled_(RawPtrAsanService::GetInstance().IsEnabled()) {
if (enabled_) {
prev_protected_args_ = protected_args;
protected_args = &protected_args_;
}
}
RawPtrAsanBoundArgTracker::~RawPtrAsanBoundArgTracker() {
if (enabled_) {
protected_args = prev_protected_args_;
}
}
void RawPtrAsanBoundArgTracker::Add(uintptr_t ptr) {
if (ptr) {
protected_args_.push_back(ptr);
}
}
} // namespace base
#endif // BUILDFLAG(USE_ASAN_BACKUP_REF_PTR)
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