windows 如何访问用户模式内存？
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原文地址: http://stackoverflow.com/questions/6316880/
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How to access user mode memory?
提问by Unknown
I'm trying to read the PEB of notepad.exe Currently I'm trying to access the PEB by registering a ProcessCreation callback and then waiting until notepad.exe is created. When notepad is created I use it's PID to open the process and find the PEB with ZwQuerryProcess(PROCESS_BASIC_INFORMATION).
我正在尝试读取 notepad.exe 的 PEB 目前我正在尝试通过注册 ProcessCreation 回调然后等待直到创建 notepad.exe 来访问 PEB。创建记事本时，我使用它的 PID 打开进程并使用 ZwQuerryProcess(PROCESS_BASIC_INFORMATION) 找到 PEB。
But when I try to read beyond INFORMATION->PEB an exception is raised (I assume this is because I can't access the memory)
但是当我尝试阅读 INFORMATION->PEB 之外的内容时，会引发异常（我认为这是因为我无法访问内存）
When I first discovered this I remembered someone mentioning the KeStackAttachProcess and it's counterpart to access addresses inside another process context.
当我第一次发现这个时，我记得有人提到了 KeStackAttachProcess，它对应于访问另一个进程上下文中的地址。
The problem is that I don't know how to check if the context change was successful or not. And once I'm supposedly inside another context I still can't access the peb. Does anyone know how I can access the PEB of notepad?
问题是我不知道如何检查上下文更改是否成功。一旦我进入另一个上下文，我仍然无法访问 peb。有谁知道我如何访问记事本的PEB？
Here's the code I'm currently using to find and access the PEB:
这是我目前用于查找和访问 PEB 的代码：
Assume hgtPid = the PID of notepad
假设 hgtPid = 记事本的 PID
void ModuleDumperThread(){
NTSTATUS Status = STATUS_SUCCESS;
HANDLE hProcessHandle = NULL;
PLIST_ENTRY Next;
PLDR_DATA_TABLE_ENTRY LdrDataTableEntry;
CLIENT_ID clientID;
ACCESS_MASK DesiredAccess = PROCESS_ALL_ACCESS;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE hProcessId = hgtPid;
PROCESS_BASIC_INFORMATION BasicInfoReal;
ULONG SizeReturned;
PEPROCESS ep;
KAPC_STATE *ka_state = NULL;
InitializeObjectAttributes (&ObjectAttributes, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
clientID.UniqueProcess = hProcessId;
clientID.UniqueThread = NULL;
__try{
Status = ZwOpenProcess(&hProcessHandle, DesiredAccess, &ObjectAttributes, &clientID);
if(Status != STATUS_SUCCESS){
DbgPrint("Failed to open process\n");
DbgPrint("NtStatus: 0x%x", Status);
return;
}
Status = gZwQueryprocess(hProcessHandle, ProcessBasicInformation, (PVOID)&BasicInfoReal, sizeof(PROCESS_BASIC_INFORMATION), &SizeReturned);
if(Status != STATUS_SUCCESS){
DbgPrint("gZwQueryprocess failed\n");
DbgPrint("Size returned: 0x%x\nNtStatus: 0x%x\n", SizeReturned, Status);
ZwClose(hProcessHandle);
return;
}
ZwClose(hProcessHandle);
Status = PsLookupProcessByProcessId(hProcessId, &ep);
if(Status != STATUS_SUCCESS){
DbgPrint("PsLookupProcessByProcessId failed\n");
DbgPrint("NtStatus: 0x%x\n", Status);
return;
}
ka_state = ExAllocatePoolWithTag(NonPagedPool, sizeof(KAPC_STATE),'trak');
KeStackAttachProcess(ep, ka_state);
__try{
if(BasicInfoReal.PebBaseAddress->Ldr){
Next = BasicInfoReal.PebBaseAddress->Ldr->InLoadOrderModuleList.Blink;
LdrDataTableEntry = CONTAINING_RECORD( Next,
LDR_DATA_TABLE_ENTRY,
LoadOrder
);
DbgPrint("Module base address: 0x%x", LdrDataTableEntry->ModuleBaseAddress);
}
}__except( EXCEPTION_EXECUTE_HANDLER ) {
DbgPrint("Exception while trying to access the PEB\n");
}
KeUnstackDetachProcess(ka_state);
ExFreePool(ka_state);
}__except( EXCEPTION_EXECUTE_HANDLER ) {
DbgPrint("Exception in ModuleDumper\n");
}
if(ep){
ObDereferenceObject(ep);
}
return;
}
Does anyone spot any errors/faults?
有没有人发现任何错误/故障？
Thanks in advance
提前致谢
EDIT:
编辑：
I've changed a few things, and this is where it gets really bizarre. For the sake of being sure I changed the 'ep' of KeStackAttachProcess() to the by msdn designated PRKPROCESS type, when I call KeStackAttachProcess() now execution just disappears. Before the call everything is going fine, after the call there's just nothing. No errors no exceptions no BSOD's: Nothing. What's going on?!?
我改变了一些东西，这就是它变得非常奇怪的地方。为了确保我将 KeStackAttachProcess() 的“ep”更改为 msdn 指定的 PRKPROCESS 类型，当我调用 KeStackAttachProcess() 时，现在执行就消失了。通话前一切正常，通话后就什么都没有了。没有错误没有例外没有蓝屏：没有。这是怎么回事？！？
Changes:
变化：
__asm{
mov eax, ep
mov eax, [eax]
mov myPKPROCESS, eax // just dereferencing my pointer (I don't have the structs)
}
DbgPrint("Test print\n"); // gets printed just fine
KeStackAttachProcess(&myPKPROCESS, ka_state);
DbgPrint("Test print\n"); // nothing happens
EDIT2:
编辑2：
I have solved the problem. I still don't know what went wrong in the above code, however this code appears to be working:
我已经解决了这个问题。我仍然不知道上面的代码出了什么问题，但是这段代码似乎可以正常工作：
void ModuleDumperThread(){
NTSTATUS Status = STATUS_SUCCESS;
HANDLE hProcessHandle = NULL;
PLIST_ENTRY Next;
PLDR_DATA_TABLE_ENTRY LdrDataTableEntry;
CLIENT_ID clientID;
ACCESS_MASK DesiredAccess = PROCESS_ALL_ACCESS;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE hProcessId = hgtPid;
PROCESS_BASIC_INFORMATION BasicInfoReal;
ULONG SizeReturned;
PEPROCESS ep = NULL;
unsigned int Index = 0;
InitializeObjectAttributes (&ObjectAttributes, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
clientID.UniqueProcess = hProcessId;
clientID.UniqueThread = NULL;
__try{
Status = ZwOpenProcess(&hProcessHandle, DesiredAccess, &ObjectAttributes, &clientID);
if(Status != STATUS_SUCCESS){
DbgPrint("Failed to open process\n");
DbgPrint("NtStatus: 0x%x", Status);
return;
}
Status = gZwQueryprocess(hProcessHandle, ProcessBasicInformation, (PVOID)&BasicInfoReal, sizeof(PROCESS_BASIC_INFORMATION), &SizeReturned);
if(Status != STATUS_SUCCESS){
DbgPrint("gZwQueryprocess failed\n");
DbgPrint("Size returned: 0x%x\nNtStatus: 0x%x\n", SizeReturned, Status);
ZwClose(hProcessHandle);
return;
}
//DbgPrint("Basic info: 0x%x\n", BasicInfoReal);
//DbgPrint("BasicInfoReal->PebBaseAddress: 0x%x\n", BasicInfoReal->PebBaseAddress);
//DbgPrint("RealPeb: 0x%x\n", RealPeb);
//DbgPrint("gZwReadVirtualMemory: 0x%x\n", gZwReadVirtualMemory);
Status = PsLookupProcessByProcessId(hProcessId, &ep);
if(Status != STATUS_SUCCESS){
DbgPrint("PsLookupProcessByProcessId failed\n");
DbgPrint("NtStatus: 0x%x\n", Status);
ZwClose(hProcessHandle);
return;
}
Timeout((INT64)0x1FFFFFF);
KeAttachProcess(ep);
__try{
DbgPrint("ImageBaseAddress of notepad.exe: 0x%x\n", BasicInfoReal.PebBaseAddress->ImageBaseAddress);
Next = BasicInfoReal.PebBaseAddress->Ldr->InLoadOrderModuleList.Blink;
LdrDataTableEntry = CONTAINING_RECORD( Next, LDR_DATA_TABLE_ENTRY, LoadOrder);
for(Index = 0; Index != 17; Index++){
DbgPrint("%d: ImageBase of %wZ in Notepad.exe: 0x%x\n", Index, &(LdrDataTableEntry->ModuleName), LdrDataTableEntry->ModuleBaseAddress);
Next = Next->Blink;
LdrDataTableEntry = CONTAINING_RECORD(Next, LDR_DATA_TABLE_ENTRY, LoadOrder);
}
}__except( EXCEPTION_EXECUTE_HANDLER ) {
DbgPrint("Exception while accessing the LDR\n");
}
KeDetachProcess();
}__except( EXCEPTION_EXECUTE_HANDLER ) {
DbgPrint("Exception in ModuleDumper\n");
}
ObDereferenceObject((PVOID)ep);
ZwClose(hProcessHandle);
return;
}
回答by swatkat
You can use PPEB PsGetProcessPeb ( IN PEPROCESS Process ). You need to use MmGetSystemRoutineAddressto get this API's address. Take a look at GetDllByPebfunction in this file:
http://code.google.com/p/arkitlib/source/browse/trunk/ARKitDrv/Ps.c
您可以使用PPEB PsGetProcessPeb ( IN PEPROCESS Process ). 您需要使用MmGetSystemRoutineAddress来获取此 API 的地址。看看GetDllByPeb这个文件中的函数：http:
//code.google.com/p/arkitlib/source/browse/trunk/ARKitDrv/Ps.c
回答by Ogame Opensource admin
This is your PsGetProcessPeb :
这是你的 PsGetProcessPeb ：
/base/ntos/ps/pshelper.c
/base/ntos/ps/pshelper.c
PPEB
PsGetProcessPeb(
__in PEPROCESS Process
)
{
return Process->Peb;
}
No need to do extra-work to extract PEBpointer from the EPROCESSstruct (which is pretty same for all Windows versions, except 32/64-bitdifference)
不需要做额外的工作来PEB从EPROCESS结构中提取指针（这对于所有 Windows 版本都非常相同，除了32/64-bit不同）
And you can get EPROCESSby PsLookupProcessByProcessId, using ID=4(System Process).
你可以EPROCESS通过PsLookupProcessByProcessId，使用ID=4（系统进程）。
