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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SANDBOX_SRC_SANDBOX_NT_UTIL_H_
#define SANDBOX_SRC_SANDBOX_NT_UTIL_H_
#include "base/basictypes.h"
#include "sandbox/src/nt_internals.h"
#include "sandbox/src/sandbox_nt_types.h"
// Placement new and delete to be used from ntdll interception code.
void* __cdecl operator new(size_t size, sandbox::AllocationType type,
void* near_to = NULL);
void __cdecl operator delete(void* memory, sandbox::AllocationType type);
// Add operator delete that matches the placement form of the operator new
// above. This is required by compiler to generate code to call operator delete
// in case the object's constructor throws an exception.
// See http://msdn.microsoft.com/en-us/library/cxdxz3x6.aspx
void __cdecl operator delete(void* memory, sandbox::AllocationType type,
void* near_to);
// Regular placement new and delete
void* __cdecl operator new(size_t size, void* buffer,
sandbox::AllocationType type);
void __cdecl operator delete(void* memory, void* buffer,
sandbox::AllocationType type);
// DCHECK_NT is defined to be pretty much an assert at this time because we
// don't have logging from the ntdll layer on the child.
//
// VERIFY_NT and VERIFY_SUCCESS_NT are the standard asserts on debug, but
// execute the actual argument on release builds. VERIFY_NT expects an action
// returning a bool, while VERIFY_SUCCESS_NT expects an action returning
// NTSTATUS.
#ifndef NDEBUG
#define DCHECK_NT(condition) { (condition) ? 0 : __debugbreak(); }
#define VERIFY(action) DCHECK_NT(action)
#define VERIFY_SUCCESS(action) DCHECK_NT(NT_SUCCESS(action))
#else
#define DCHECK_NT(condition)
#define VERIFY(action) (action)
#define VERIFY_SUCCESS(action) (action)
#endif
#define NOTREACHED_NT() DCHECK_NT(false)
namespace sandbox {
extern "C" long _InterlockedCompareExchange(long volatile* destination,
long exchange, long comperand);
#pragma intrinsic(_InterlockedCompareExchange)
// We want to make sure that we use an intrinsic version of the function, not
// the one provided by kernel32.
__forceinline void* _InterlockedCompareExchangePointer(
void* volatile* destination, void* exchange, void* comperand) {
size_t ret = _InterlockedCompareExchange(
reinterpret_cast<long volatile*>(destination),
static_cast<long>(reinterpret_cast<size_t>(exchange)),
static_cast<long>(reinterpret_cast<size_t>(comperand)));
return reinterpret_cast<void*>(static_cast<size_t>(ret));
}
// Returns a pointer to the IPC shared memory.
void* GetGlobalIPCMemory();
// Returns a pointer to the Policy shared memory.
void* GetGlobalPolicyMemory();
enum RequiredAccess {
READ,
WRITE
};
// Performs basic user mode buffer validation. In any case, buffers access must
// be protected by SEH. intent specifies if the buffer should be tested for read
// or write.
// Note that write intent implies destruction of the buffer content (we actually
// write)
bool ValidParameter(void* buffer, size_t size, RequiredAccess intent);
// Copies data from a user buffer to our buffer. Returns the operation status.
NTSTATUS CopyData(void* destination, const void* source, size_t bytes);
// Copies the name from an object attributes.
NTSTATUS AllocAndCopyName(const OBJECT_ATTRIBUTES* in_object,
wchar_t** out_name, uint32* attributes, HANDLE* root);
// Initializes our ntdll level heap
bool InitHeap();
// Returns true if the provided handle refers to the current process.
bool IsSameProcess(HANDLE process);
enum MappedModuleFlags {
MODULE_IS_PE_IMAGE = 1, // Module is an executable.
MODULE_HAS_ENTRY_POINT = 2, // Execution entry point found.
MODULE_HAS_CODE = 4 // Non zero size of executable sections.
};
// Returns the name and characteristics for a given PE module. The return
// value is the name as defined by the export table and the flags is any
// combination of the MappedModuleFlags enumeration.
//
// The returned buffer must be freed with a placement delete from the ntdll
// level allocator:
//
// UNICODE_STRING* name = GetPEImageInfoFromModule(HMODULE module, &flags);
// if (!name) {
// // probably not a valid dll
// return;
// }
// InsertYourLogicHere(name);
// operator delete(name, NT_ALLOC);
UNICODE_STRING* GetImageInfoFromModule(HMODULE module, uint32* flags);
// Returns the full path and filename for a given dll.
// May return NULL if the provided address is not backed by a named section, or
// if the current OS version doesn't support the call. The returned buffer must
// be freed with a placement delete (see GetImageNameFromModule example).
UNICODE_STRING* GetBackingFilePath(PVOID address);
// Returns the last component of a path that contains the module name.
// It will return NULL if the path ends with the path separator. The returned
// buffer must be freed with a placement delete (see GetImageNameFromModule
// example).
UNICODE_STRING* ExtractModuleName(const UNICODE_STRING* module_path);
// Returns true if the parameters correspond to a dll mapped as code.
bool IsValidImageSection(HANDLE section, PVOID *base, PLARGE_INTEGER offset,
PSIZE_T view_size);
// Converts an ansi string to an UNICODE_STRING.
UNICODE_STRING* AnsiToUnicode(const char* string);
// Provides a simple way to temporarily change the protection of a memory page.
class AutoProtectMemory {
public:
AutoProtectMemory()
: changed_(false), address_(NULL), bytes_(0), old_protect_(0) {}
~AutoProtectMemory() {
RevertProtection();
}
// Sets the desired protection of a given memory range.
NTSTATUS ChangeProtection(void* address, size_t bytes, ULONG protect);
// Restores the original page protection.
NTSTATUS RevertProtection();
private:
bool changed_;
void* address_;
size_t bytes_;
ULONG old_protect_;
DISALLOW_COPY_AND_ASSIGN(AutoProtectMemory);
};
// Returns true if the file_rename_information structure is supported by our
// rename handler.
bool IsSupportedRenameCall(FILE_RENAME_INFORMATION* file_info, DWORD length,
uint32 file_info_class);
} // namespace sandbox
#endif // SANDBOX_SRC_SANDBOX_NT_UTIL_H__
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