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c63c073d27
Include check_op.h directly, instead of relying on the transitive include from logging.h. This transitive include does not exist in Chromium's //base. Change-Id: I15962a9cdc26ac206032157b8d2659cf263ad695 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/4950200 Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
// Copyright 2018 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/process/process_memory_win.h"
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#include <windows.h>
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#include <algorithm>
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#include <limits>
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#include "base/check_op.h"
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#include "base/logging.h"
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#include "base/memory/page_size.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/strings/stringprintf.h"
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namespace crashpad {
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ProcessMemoryWin::ProcessMemoryWin()
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: ProcessMemory(), handle_(), process_info_(), initialized_() {}
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ProcessMemoryWin::~ProcessMemoryWin() {}
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bool ProcessMemoryWin::Initialize(HANDLE handle) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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handle_ = handle;
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if (!process_info_.Initialize(handle)) {
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LOG(ERROR) << "Failed to initialize ProcessInfo.";
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return false;
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}
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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ssize_t ProcessMemoryWin::ReadUpTo(VMAddress address,
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size_t size,
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void* buffer) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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DCHECK_LE(size, (size_t)std::numeric_limits<ssize_t>::max());
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SIZE_T size_out = 0;
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BOOL success = ReadProcessMemory(
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handle_, reinterpret_cast<void*>(address), buffer, size, &size_out);
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if (success)
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return base::checked_cast<ssize_t>(size_out);
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if (GetLastError() == ERROR_PARTIAL_COPY) {
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// If we can not read the entire section, perform a short read of the first
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// page instead. This is necessary to support ReadCString().
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size_t short_read =
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base::GetPageSize() - (address & (base::GetPageSize() - 1));
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success = ReadProcessMemory(handle_,
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reinterpret_cast<void*>(address),
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buffer,
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short_read,
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&size_out);
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if (success)
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return base::checked_cast<ssize_t>(size_out);
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}
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PLOG(ERROR) << "ReadMemory at 0x" << std::hex << address << std::dec << " of "
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<< size << " bytes failed";
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return -1;
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}
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size_t ProcessMemoryWin::ReadAvailableMemory(VMAddress address,
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size_t size,
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void* buffer) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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DCHECK_LE(size, (size_t)std::numeric_limits<ssize_t>::max());
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if (size == 0)
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return 0;
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auto ranges = process_info_.GetReadableRanges(
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CheckedRange<WinVMAddress, WinVMSize>(address, size));
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// We only read up until the first unavailable byte, so we only read from the
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// first range. If we have no ranges, then no bytes were accessible anywhere
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// in the range.
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if (ranges.empty()) {
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LOG(ERROR) << base::StringPrintf(
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"range at 0x%llx, size 0x%zx completely inaccessible", address, size);
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return 0;
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}
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// If the start address was adjusted, we couldn't read even the first
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// requested byte.
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if (ranges.front().base() != address) {
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LOG(ERROR) << base::StringPrintf(
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"start of range at 0x%llx, size 0x%zx inaccessible", address, size);
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return 0;
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}
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DCHECK_LE(ranges.front().size(), size);
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ssize_t result = ReadUpTo(ranges.front().base(),
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base::checked_cast<size_t>(ranges.front().size()),
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buffer);
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if (result < 0)
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return 0;
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return base::checked_cast<size_t>(result);
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}
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} // namespace crashpad
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