// Copyright 2015 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef CRASHPAD_UTIL_WIN_PROCESS_INFO_H_
#define CRASHPAD_UTIL_WIN_PROCESS_INFO_H_
#include <windows.h>
#include <sys/types.h>
#include <string>
#include <vector>
#include "util/misc/initialization_state_dcheck.h"
#include "util/numeric/checked_range.h"
#include "util/process/process_id.h"
#include "util/stdlib/aligned_allocator.h"
#include "util/win/address_types.h"
namespace crashpad {
//! \brief Gathers information about a process given its `HANDLE`. This consists
//! primarily of information stored in the Process Environment Block.
class ProcessInfo {
public:
//! \brief The return type of MemoryInfo(), for convenience.
using MemoryBasicInformation64Vector =
AlignedVector<MEMORY_BASIC_INFORMATION64>;
//! \brief Contains information about a module loaded into a process.
struct Module {
Module();
~Module();
//! \brief The pathname used to load the module from disk.
std::wstring name;
//! \brief The base address of the loaded DLL.
WinVMAddress dll_base;
//! \brief The size of the module.
WinVMSize size;
//! \brief The module's timestamp.
time_t timestamp;
};
struct Handle {
Handle();
~Handle();
//! \brief A string representation of the handle's type.
std::wstring type_name;
//! \brief The handle's value.
int handle;
//! \brief The attributes for the handle, e.g. `OBJ_INHERIT`,
//! `OBJ_CASE_INSENSITIVE`, etc.
uint32_t attributes;
//! \brief The `ACCESS_MASK` for the handle in this process.
//!
//! See
//! https://blogs.msdn.microsoft.com/openspecification/2010/04/01/about-the-access_mask-structure/
//! for more information.
uint32_t granted_access;
//! \brief The number of kernel references to the object that this handle
//! refers to.
uint32_t pointer_count;
//! \brief The number of open handles to the object that this handle refers
//! to.
uint32_t handle_count;
};
ProcessInfo();
ProcessInfo(const ProcessInfo&) = delete;
ProcessInfo& operator=(const ProcessInfo&) = delete;
~ProcessInfo();
//! \brief Initializes this object with information about the given
//! \a process.
//!
//! This method must be called successfully prior to calling any other
//! method in this class. This method may only be called once.
//!
//! \return `true` on success, `false` on failure with a message logged.
bool Initialize(HANDLE process);
//! \return `true` if the target process is a 64-bit process.
bool Is64Bit() const;
//! \return `true` if the target process is running on the Win32-on-Win64
//! subsystem.
bool IsWow64() const;
//! \return The target process's process ID.
crashpad::ProcessID ProcessID() const;
//! \return The target process's parent process ID.
crashpad::ProcessID ParentProcessID() const;
//! \return The command line from the target process's Process Environment
//! Block.
bool CommandLine(std::wstring* command_line) const;
//! \brief Gets the address and size of the process's Process Environment
//! Block.
//!
//! \param[out] peb_address The address of the Process Environment Block.
//! \param[out] peb_size The size of the Process Environment Block.
void Peb(WinVMAddress* peb_address, WinVMSize* peb_size) const;
//! \brief Retrieves the modules loaded into the target process.
//!
//! The modules are enumerated in initialization order as detailed in the
//! Process Environment Block. The main executable will always be the
//! first element.
bool Modules(std::vector<Module>* modules) const;
//! \brief Retrieves information about all pages mapped into the process.
const MemoryBasicInformation64Vector& MemoryInfo() const;
//! \brief Given a range to be read from the target process, returns a vector
//! of ranges, representing the readable portions of the original range.
//!
//! \param[in] range The range being identified.
//!
//! \return A vector of ranges corresponding to the portion of \a range that
//! is readable based on the memory map.
std::vector<CheckedRange<WinVMAddress, WinVMSize>> GetReadableRanges(
const CheckedRange<WinVMAddress, WinVMSize>& range) const;
//! \brief Given a range in the target process, determines if the entire range
//! is readable.
//!
//! \param[in] range The range being inspected.
//!
//! \return `true` if the range is fully readable, otherwise `false` with a
//! message logged.
bool LoggingRangeIsFullyReadable(
const CheckedRange<WinVMAddress, WinVMSize>& range) const;
//! \brief Retrieves information about open handles in the target process.
const std::vector<Handle>& Handles() const;
private:
template <class Traits>
friend bool GetProcessBasicInformation(HANDLE process,
bool is_wow64,
ProcessInfo* process_info,
WinVMAddress* peb_address,
WinVMSize* peb_size);
template <class Traits>
friend bool ReadProcessData(HANDLE process,
WinVMAddress peb_address_vmaddr,
ProcessInfo* process_info);
friend bool ReadMemoryInfo(HANDLE process,
bool is_64_bit,
ProcessInfo* process_info);
// This function is best-effort under low memory conditions.
std::vector<Handle> BuildHandleVector(HANDLE process) const;
crashpad::ProcessID process_id_;
crashpad::ProcessID inherited_from_process_id_;
HANDLE process_;
std::wstring command_line_;
WinVMAddress peb_address_;
WinVMSize peb_size_;
std::vector<Module> modules_;
// memory_info_ is a MemoryBasicInformation64Vector instead of a
// std::vector<MEMORY_BASIC_INFORMATION64> because MEMORY_BASIC_INFORMATION64
// is declared with __declspec(align(16)), but std::vector<> does not maintain
// this alignment on 32-bit x86. clang-cl (but not MSVC cl) takes advantage of
// the presumed alignment and emits SSE instructions that require aligned
// storage. clang-cl should relax (unfortunately), but in the mean time, this
// provides aligned storage. See https://crbug.com/564691 and
// https://llvm.org/PR25779.
//
// TODO(mark): Remove this workaround when https://llvm.org/PR25779 is fixed
// and the fix is present in the clang-cl that compiles this code.
MemoryBasicInformation64Vector memory_info_;
// Handles() is logically const, but updates this member on first retrieval.
// See https://crashpad.chromium.org/bug/9.
mutable std::vector<Handle> handles_;
bool is_64_bit_;
bool is_wow64_;
InitializationStateDcheck initialized_;
};
//! \brief Given a memory map of a process, and a range to be read from the
//! target process, returns a vector of ranges, representing the readable
//! portions of the original range.
//!
//! This is a free function for testing, but prefer
//! ProcessInfo::GetReadableRanges().
std::vector<CheckedRange<WinVMAddress, WinVMSize>> GetReadableRangesOfMemoryMap(
const CheckedRange<WinVMAddress, WinVMSize>& range,
const ProcessInfo::MemoryBasicInformation64Vector& memory_info);
} // namespace crashpad
#endif // CRASHPAD_UTIL_WIN_PROCESS_INFO_H_
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