当ntdll.dll映射到新进程时,如何进入WinDBG

Question

当ntdll.dll映射到新进程时,并且在任何ntdll的进程初始化运行之前,我想使用以下命令进入WinDBG.

sxe ld ntdll.dll; g

但是,这个技巧根本不起作用,

ModLoad: 7c900000 7c9b0000   ntdll.dll
eax=010043af ebx=7ffde000 ecx=020f18f5 edx=00000034 esi=00c2f720 edi=00c2f6f2
eip=7c810867 esp=0006fffc ebp=00000720 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00000200
7c810867  ??              ???
Processing initial command 'sxe ld ntdll.dll ;g'
0:000> sxe ld ntdll.dll ;g
(ae8.6f4): Break instruction exception - code 80000003 (first chance)
eax=00181eb4 ebx=7ffde000 ecx=00000001 edx=00000002 esi=00181f48 edi=00181eb4
eip=7c901230 esp=0006fb20 ebp=0006fc94 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202
ntdll!DbgBreakPoint:
7c901230 cc              int     3

那么,当ntdll.dll映射到新进程时,如何进入WinDBG？谢谢

[UPDATE]

我完全按照jcopenha提到的步骤,但我不知道为什么Windbg会在Notepad.exe运行时发出一个奇怪的错误(内存访问错误).

请帮我一把!非常感谢!

0:000> .restart /f
CommandLine: C:\WINDOWS\NOTEPAD.EXE
Symbol search path is: D:\Symbols\Symbols;SRV*D:\Symbols\MySymbols*http://msdl.microsoft.com/download/symbols
Executable search path is: 
ModLoad: 01000000 01014000   notepad.exe
eax=0100739d ebx=7ffd9000 ecx=020f18f5 edx=0000004e esi=00f7f73a edi=00f7f6f2
eip=7c810867 esp=0007fffc ebp=0000024c iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00000200
7c810867 ??              ???
0:000> u 7c810867
7c810867 ??              ???
            ^ Memory access error in 'u 7c810867'

[UPDATE2] 我在7c810867发现了一条奇怪的指令,但是p命令仍然可以正常工作.

它是WinDBG中的一个错误吗？

Answer 1

如果您转到Debug-> Event Filters并将"Create process"更改为"enabled",则重新启动它将在ntdll.dll出现在模块列表中之前启动的应用程序.如果你这样做sxe ld ntdll.dll;g,它将停止ntdll!RtlUserThreadStart.

0:000> .restart /f
CommandLine: C:\Windows\System32\notepad.exe
Symbol search path is: SRV*d:\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is: 
ModLoad: 00000000`ffe00000 00000000`ffe35000   notepad.exe
00000000`7790c500 4883ec48        sub     rsp,48h
0:000> sxe ld ntdll.dll;g
ModLoad: 00000000`778e0000 00000000`77a89000   ntdll.dll
ntdll!RtlUserThreadStart:
00000000`7790c500 4883ec48        sub     rsp,48h