在 windbg 脚本中获取 System.__ComObject 的 RCW 值

Question

我正在尝试编写一个 Windbg 脚本，其中我在一个文件中有 1k 个地址。对于每个地址，在偏移 0x30 处是一个 COM 对象。

我想从 COM 对象获取所有本机指针。我知道如何像下面那样手动操作。我在脚本中迭代它时遇到问题。

从 System.__ComObject，!do <comobject> 得到 RCW: in text。使用 !DumpRCW 转储 RCW 得到我需要的 IUnknown pointer。

Name:        System.__ComObject
MethodTable: 00007ffcf2941330
EEClass:     00007ffcf22264b0
RCW:         000001d3634f3460
Size:        32(0x20) bytes
File:        C:\Windows\Microsoft.Net\assembly\GAC_64\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll
Fields:
              MT    Field   Offset                 Type VT     Attr            Value Name
00007ffcf2949de8  40005b2        8        System.Object  0 instance 0000000000000000 __identity
00007ffcf294d1f8  400045c       10 ...ections.Hashtable  0 instance 0000000000000000 m_ObjectToDataMap

0:000> !DumpRCW /d 000001d35a9e0d70
Managed object:             000001d37976a708
Creating thread:            000001d35d552a60
IUnknown pointer:           000001d31e63ce28
COM Context:                000001dffecab0f8
Managed ref count:          1
IUnknown V-table pointer :  00007ffcd3f0edb8 (captured at RCW creation time)
Flags:                      
COM interface pointers:
              IP          Context               MT Type
000001d31e63ce20 000001dffecab0f8 00007ffc949869c0 NativeClass.ClassX
000001d31e63ce28 000001dffecab0f8 00007ffc949868e0 NativeClass.ClassX

对于脚本，问题是：

如何使用脚本从 ComObject 获取 RCW 值？ System.__ComObject 中的字段为空。

我目前拥有的脚本：

0:000> .foreach /f ( obj "d:\windbg\debug1.allmanagedtxs.small.txt") { .printf "%p\n", obj; !do poi(${obj}+0x30) }
000001d378daa6d8
Name:        System.__ComObject
MethodTable: 00007ffcf2941330
EEClass:     00007ffcf22264b0
RCW:         000001d3634f3460
Size:        32(0x20) bytes
File:        C:\Windows\Microsoft.Net\assembly\GAC_64\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll
Fields:
              MT    Field   Offset                 Type VT     Attr            Value Name
00007ffcf2949de8  40005b2        8        System.Object  0 instance 0000000000000000 __identity
00007ffcf294d1f8  400045c       10 ...ections.Hashtable  0 instance 0000000000000000 m_ObjectToDataMap
000001d37976a728
Name:        System.__ComObject
MethodTable: 00007ffcf2941330
EEClass:     00007ffcf22264b0
RCW:         000001d35a9e0d70
Size:        32(0x20) bytes
File:        C:\Windows\Microsoft.Net\assembly\GAC_64\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll
Fields:
              MT    Field   Offset                 Type VT     Attr            Value Name
00007ffcf2949de8  40005b2        8        System.Object  0 instance 0000000000000000 __identity
00007ffcf294d1f8  400045c       10 ...ections.Hashtable  0 instance 0000000000000000 m_ObjectToDataMap

Answer 1

我讨厌解析字符串 :) 但这里又是一个解析字符串的方法它正在实时会话中调整它以从文件

中解析

/// <reference path="JSProvider.d.ts" />
function log(x) {
    host.diagnostics.debugLog(x + "\n")
}
function exec(cmdstr) {
    return host.namespace.Debugger.Utility.Control.ExecuteCommand(cmdstr);
}
function rcw(first) {
    var obs = exec("!DumpHeap -short -type System.__ComObject")
    for (i of obs) {
        var cstr = "!do -nofields " + i
        foo = exec(cstr)
        for (j of foo) {
            if (j.includes("RCW") == true) {
                blah = exec("!DumpRCW " + j.substr(j.lastIndexOf(" ") + 1))
                for (k of blah) {
                    if (k.includes("IUnknown pointer") == true) {
                        log(k)
                    }
                }
            }
        }
    }
}

在实时目标上执行此操作

.load jsprovider 
.scriptload  foo.js
0:007> dx @$scriptContents.rcw()
IUnknown pointer:           00000227da903bf0
IUnknown pointer:           00000227da73e618
IUnknown pointer:           00000227da73dd10
IUnknown pointer:           00000227f4a765f0
IUnknown pointer:           00000227f4a77888
IUnknown pointer:           00000227f4a74ea0
@$scriptContents.rcw()

实际点击注意 3bf0

0:007> !DumpHeap -short -type System.__ComObject
00000227dc23b218
00000227dc23f620
00000227dc23f640
00000227dc25e7d0
00000227dc25faa0
00000227dc25fac0
0:007> !DumpObj /d 00000227dc23b218
Name:        System.__ComObject
MethodTable: 00007ffda24adad8
EEClass:     00007ffda2492608
RCW:         00000227da7450e0
Size:        32(0x20) bytes
File:        C:\WINDOWS\Microsoft.Net\assembly\GAC_64\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll
Fields:
              MT    Field   Offset                 Type VT     Attr            Value Name
00007ffda2518948  40005b8        8        System.Object  0 instance 0000000000000000 __identity
00007ffda251bb18  4000462       10 ...ections.Hashtable  0 instance 0000000000000000 m_ObjectToDataMap
0:007> !DumpRCW /d 00000227da7450e0
Managed object:             00000227dc23b218
Creating thread:            00000227da6e30b0
IUnknown pointer:           00000227da903bf0
COM Context:                00000227da72c668
Managed ref count:          1
IUnknown V-table pointer :  00007ffdc3252190 (captured at RCW creation time)
Flags:                      
COM interface pointers:
              IP          Context               MT Type
00000227da903bf0 00000227da72c668 00007ffd4a1b5c88 TestDispatchUtility.DispatchUtility+IDispatchInfo

顺便说一句，使用的二进制文件来自 here

在 windbg 脚本中获取 System.__ComObject 的 RCW 值

Getting RCW value of System.__ComObject in windbg script

com

windbg

rcw