如何在与Python相关的库中转义星号?

时间:2018-11-12 15:24:59

标签: python regex escaping windbg pykd

我正在使用PYKD(一个库,用于为Windbg编写Python脚本)。

处理包含星号的类型名称时,其中一个功能typedVar似乎不起作用:

(在Windbg会话中):

.load pykd.pyd // Load PYKD library
!py            // enter an interactive Python session

>>> print typedVar('CMap<unsigned long,unsigned long,int,int>', 0x02d729dc).m_nCount
Int4B at 0x2d729e8 Value: 0x4 (4)
=> ok!
>>> print typedVar('CMap<int,int,ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > > >', 0x02ca2568).m_nCount
Int4B at 0x2ca2574 Value: 0x7 (7)
=> ok!

>>> print typedVar('CMap<int,int,void *,void *>', 0x0054ac10).m_nCount
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeException: CMap<int,int,void *,void *> : invalid type name
=> NOK (most probably because of the asterisk)

我认为这是由星号引起的,被解释为通配符,因此我想使用转义字符,以便将星号用作“正常”字符,但这似乎并不那么简单:

使用反斜杠:

>>> print typedVar('CMap<int,int,void \*,void \*>', 0x0054ac10).m_nCount
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeException: CMap<int,int,void \*,void \*> : invalid type name

加倍星号:

>>> print typedVar('CMap<int,int,void **,void **>', 0x0054ac10).m_nCount
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeException: CMap<int,int,void **,void **> : invalid type name

有人知道Python中正则表达式的转义字符吗(如果它不是反斜杠或双倍字符)?

预先感谢

哦,在我忘记之前:所提到的类型出现在应用程序的符号中,如您在此处看到的:

for tp in app.enumTypes("*CMap<*"):
  print tp
...
CMap<int,int,void *,void *>
...

在第一个评论后编辑并回复

这些是我使用的命令(ru):

>>> print typedVar(r'CMap<int,int,void *,void *>', 0x0054ac10).m_nCount
>>> print typedVar(u'CMap<int,int,void *,void *>', 0x0054ac10).m_nCount
>>> print typedVar(rr'CMap<int,int,void *,void *>', 0x0054ac10).m_nCount
>>> print typedVar(r'''CMap<int,int,void *,void *>''', 0x0054ac10).m_nCount
>>> print typedVar(r''CMap<int,int,void *,void *>'', 0x0054ac10).m_nCount
>>> print typedVar(ru'CMap<int,int,void *,void *>', 0x0054ac10).m_nCount
>>> print typedVar(ru'CMap<int,int,void *,void *>', 0x0054ac10).m_nCount

在进一步使用最新的PYKD库后进行编辑

不幸的是,仍然存在问题,如您从以下摘录中看到的:

0:000> .load pykd.pyd
0:000> .chain
Extension DLL search Path:
    ...
Extension DLL chain:
    pykd.pyd: image 0.3.4.2, API 1.0.0, built Sat Nov 17 13:06:54 2018
        [path: C:\Program Files (x86)\Windows Kits\10\Debuggers\x86\winext\pykd.pyd]
    ...
0:000> !py

  >>> dprintln("%d" % typedVar('Application!CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>', 0x064ad440).m_nCount)
  2
  => An asterisk in the type name can sometimes be handled
  >>> dprintln("%d" % typedVar('Application!CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>', 0x064ad328).m_nCount)
  Traceback (most recent call last):
    File "<console>", line 1, in <module>
  AttributeError: typed var has no field 'm_nCount'
  => But sometimes there still are issues.
     The error message clearly shows that the typename is known.

这里可能是什么问题?我可以做些什么来添加更详细的调试信息吗?

根据ussrhero的新提案进行编辑

typeInfo似乎为空:

>>> print(typeInfo('Application!CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>'))
class/struct : CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *> Size: 0x0 (0)

出于参考原因,这里还有另一个与CMap相关的typeInfo:

>>> print(typeInfo('Application!CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>'))
class/struct : CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int> Size: 0x1c (28)
   +0000 __VFN_table             : VTable*
   =0000000000 classCObject      : CRuntimeClass
   +0004 m_pHashTable            : CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>::CAssoc**
   +0008 m_nHashTableSize        : UInt4B
   +000c m_nCount                : Int4B
   +0010 m_pFreeList             : CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>::CAssoc*
   +0014 m_pBlocks               : CPlex*
   +0018 m_nBlockSize            : Int4B

这里是不存在的类的typeInfo(也出于参考原因):

>>> print(typeInfo('Application!NonExisting_Class'))
Traceback (most recent call last):
  File "<console>", line 1, in <module>
SymbolException: 'NonExisting_Class' - symbol not found

=>因此,给出问题的类是已知的,但显然无法处理。

在ussrhero的最新更新后进行编辑:

dtdx似乎提到其他CMap一切正常:

0:000> dt 0x064ad440 CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>
Application!CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>
   +0x000 __VFN_table : 0x01503444 
   +0x004 m_pHashTable     : 0x06ab9ad0  -> (null) 
   +0x008 m_nHashTableSize : 0x186ab
   +0x00c m_nCount         : 0n2
   +0x010 m_pFreeList      : 0x063c953c CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>::CAssoc
   +0x014 m_pBlocks        : 0x063c9518 CPlex
   +0x018 m_nBlockSize     : 0n10
0:000> dt 0x064ad440 CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int> m_nCount
Application!CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>
   +0x00c m_nCount : 0n2
0:000> dx (CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>*) 0x064ad440
(CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>*) 0x064ad440                 : 0x64ad440 [Type: CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int> *]
    [+0x004] m_pHashTable     : 0x6ab9ad0 [Type: CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>::CAssoc * *]
    [+0x008] m_nHashTableSize : 0x186ab [Type: unsigned int]
    [+0x00c] m_nCount         : 2 [Type: int]
    [+0x010] m_pFreeList      : 0x63c953c [Type: CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>::CAssoc *]
    [+0x014] m_pBlocks        : 0x63c9518 [Type: CPlex *]
    [+0x018] m_nBlockSize     : 10 [Type: int]

dtdx似乎提到该特定CMap存在问题:

0:000> dt 0x064ad328 CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>
Application!CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>
0:000> dt 0x064ad328 CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *> m_nCount
Application!CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>
0:000> dx (CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>*) 0x064ad328
Error: Unable to find type 'CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *> *' for cast.

但是,这些符号似乎没有问题:

0:000> x /2 Application!CMap<*vftable*
...
0152e944          Application!CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION *,_RTL_CRITICAL_SECTION *>::`vftable'
...
01503444          Application!CMap<ATL::CStringT<wchar_t,StrTraitMFC_DLL<wchar_t,ATL::ChTraitsCRT<wchar_t> > >,wchar_t const *,unsigned int,unsigned int>::`vftable'

显然,我们在这里处理Windbg问题。我们如何找出这是已知的Windbg问题还是新的问题?这些问题在哪里收集? (有关您的信息,我正在使用Windows 10版本1803(操作系统内部版本17134.345)的Windbg 10.0.16299.15 X86,但Windbg Preview似乎也有此错误。

4 个答案:

答案 0 :(得分:1)

这是一个pykd错误: https://githomelab.ru/pykd/pykd/issues/33

它将在下一个版本中修复

答案 1 :(得分:1)

尝试打印出类型信息:

>>>print( typeInfo('Application!CMap<unsigned int,unsigned int,_RTL_CRITICAL_SECTION,_RTL_CRITICAL_SECTION *>') )

答案 2 :(得分:0)

无法发表评论,但您可以尝试在此处说明的“字符串”
What exactly do "u" and "r" string flags do, and what are raw string literals?

或者,如果可以的话,将指针交换为任何无符号的64位数据类型。

答案 3 :(得分:0)

typedVar不会干扰类型名称。您必须使用与符号信息中包含的相同的类型名称。

尝试使用dt命令找到它:

dt CMap*

或使用pykd:

print( "\n".join( module('ModuleName').enumTypes('CMap*') )

我相信它将看起来像'CMap '(不带任何空格)