我正在尝试阅读 notepad.exe 的 PEB 目前我正在尝试通过注册一个 ProcessCreation 回调然后等待 notepad.exe 创建来访问 PEB。创建记事本后，我使用它的 PID 打开进程并使用 ZwQuerryProcess(PROCESS_BASIC_INFORMATION) 找到 PEB。
但是当我尝试阅读 INFORMATION->PEB 以外的内容时，会引发异常(我认为这是因为我无法访问内存)
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。
问题是我不知道如何检查上下文更改是否成功。一旦我应该在另一个上下文中，我仍然无法访问 peb。有谁知道如何访问记事本的PEB？
这是我目前用来查找和访问 PEB 的代码:
假设 hgtPid = notepad 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;
}
有人发现任何错误/故障吗？
提前致谢
编辑:
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() 现在执行消失了。通话前一切正常，通话后就什么都没有了。没有错误没有异常没有蓝屏死机:没有。 这是怎么回事？!？
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
编辑 2:
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;
}
最佳答案
您可以使用 PPEB PsGetProcessPeb(在 PEPROCESS 进程中)。您需要使用 MmGetSystemRoutineAddress 来获取此 API 的地址。查看此文件中的 GetDllByPeb 函数:
http://code.google.com/p/arkitlib/source/browse/trunk/ARKitDrv/Ps.c
关于c - 如何访问用户态内存？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6316880/