WinDBG加载符号表的一点心得体会（转载）

WinDBG加载符号表的一点心得体会 Posted on 2011-03-25 21:38 Biffo Lee 阅读(12246) 评论(3) 编辑 收藏 WinDBG无法加载符号表是很痛苦的事情，明明符号表的路径已经加载进去了，可是还是无法加断点，下面直接进入主题： 符号表无法加载，无法触发断点。 1、检查sympath是否正确 kd> .sympath Symbol search path is: srv*http://msdl.microsoft.com/download/symbols;C:\Windows\symbols;D:\VSSDataBase\TrueCrypt\Driver\obj_driver_debug\i386 Expanded Symbol search path is: srv*http://msdl.microsoft.com/download/symbols;c:\windows\symbols;d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386 之前的尝试，以为符号表的路径在前面和在后面关系很大，毕竟是依次查找路径的嘛，只要查找正确了，路径前后和符号表在什么位置又有什么关系呢。 src*与;之前的区别：src*是符号表服务器上找，而;是去本地路径上去找，对于一台机子来说就一样的。 2、!lmi truecrypt查找相应的模块信息 kd> !lmi truecrypt Loaded Module Info: [truecrypt]           Module: truecrypt    Base Address: ee21b000      Image Name: truecrypt.sys    Machine Type: 332 (I386)      Time Stamp: 4d889673 Tue Mar 22 20:30:43 2011            Size: 4ef80        CheckSum: 55776 Characteristics: 102   Debug Data Dirs: Type  Size     VA  Pointer              CODEVIEW    5c, 43fc8,   43fc8 RSDS - GUID: {1B9489BA-E47D-4E48-89EB-D0CB60055F22}                Age: 1, Pdb: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb      Image Type: MEMORY   - Image read successfully from loaded memory.     Symbol Type: EXPORT   - PDB not found     Load Report: export symbols Symbol Type: EXPORT   - PDB not found 符号表没有找到 Export 没有发现符号文件，使用映像文件的输出信息（如DLL的Export）作为符号 3、检查符号表加载详细情况 !sym noisy 当Windbg加载Symbol文件的时候，显示Symbol的路径，默认情况下是不显示的。 YMSRV:  无法与服务器建立连接 SYMSRV:  c:\windows\symbols\truecrypt.pdb\1B9489BAE47D4E4889EBD0CB60055F221\truecrypt.pdb not found !sym quiet 不显示路径 SYMSRV: truecrypt.pdb not found kd> !sym noisy noisy mode - symbol prompts on kd> .reload /f truecrypt.sys SYMSRV: 无法与服务器建立连接 SYMSRV: c:\windows\symbols\truecrypt.pdb\1B9489BAE47D4E4889EBD0CB60055F221\truecrypt.pdb not found SYMSRV: http://msdl.microsoft.com/download/symbols/truecrypt.pdb/1B9489BAE47D4E4889EBD0CB60055F221/truecrypt.pdb not found DBGHELP: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb - mismatched pdb DBGHELP: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\sys\truecrypt.pdb - file not found DBGHELP: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\symbols\sys\truecrypt.pdb - file not found SYMSRV: 无法与服务器建立连接 SYMSRV: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb\1B9489BAE47D4E4889EBD0CB60055F221\truecrypt.pdb not found SYMSRV: c:\windows\symbols\truecrypt.pdb\1B9489BAE47D4E4889EBD0CB60055F221\truecrypt.pdb not found SYMSRV: http://msdl.microsoft.com/download/symbols/truecrypt.pdb/1B9489BAE47D4E4889EBD0CB60055F221/truecrypt.pdb not found DBGHELP: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb - mismatched pdb DBGHELP: Couldn't load mismatched pdb for truecrypt.sys *** ERROR: Symbol file could not be found. Defaulted to export symbols for truecrypt.sys - DBGHELP: truecrypt - export symbols 注意上面那一行，符号表的位置是正确的，也找对了，但是结果却是mismatched pdb，于是我就将debug目录下内容，删除后重新生成，并拷贝到虚拟机里，结果仍然是一样的， 仍然是mismatched pdb。 4、模块详情对照 !IToldYouSo tests the validity of a module against a symbol file.The module can be specified by either its name or base address.If a symbol file is not specified, then the loaded symbol is tested. Otherwise, if a pdb or dbg symbol file path is specified, it is tested against the loaded module. kd> !itoldyouso truecrypt d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb truecrypt.sys     Timestamp: 4D889673   SizeOfImage: 4EF80           pdb: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb       pdb sig: 1B9489BA-E47D-4E48-89EB-D0CB60055F22           age: 1 truecrypt.pdb       pdb sig: 329A35FA-70B8-4A97-BB0E-99BA6342AB6A           age: 1 sig MISMATCH: truecrypt.pdb and truecrypt.sys 签名不一样，结果说明我虚拟机里装载的驱动和我重新生成的符号表不一致。经过检查发现，truecrypt.exe启动时候装载的truecrypt.sys并不是在C:\Windows\System32\Drivers下面， 而是在truecrypt.exe本身的安装目录下，替换之后，已经能够成功装载符号表了。 如下： kd> !lmi truecrypt Loaded Module Info: [truecrypt]           Module: truecrypt    Base Address: ee1ef000      Image Name: truecrypt.sys    Machine Type: 332 (I386)      Time Stamp: 4d8c8e61 Fri Mar 25 20:45:21 2011            Size: 4f180        CheckSum: 5b7fa Characteristics: 102   Debug Data Dirs: Type  Size     VA  Pointer              CODEVIEW    5c, 44148,   44148 RSDS - GUID: {160409E4-8EFC-4412-B760-4E9BF8F1A05A}                Age: 1, Pdb: d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb      Image Type: MEMORY   - Image read successfully from loaded memory.     Symbol Type: PDB      - Symbols loaded successfully from symbol search path.                  d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb        Compiler: Resource - front end [0.0 bld 0] - back end [9.0 bld 30729]     Load Report: private symbols & lines, not source indexed                   d:\vssdatabase\truecrypt\driver\obj_driver_debug\i386\truecrypt.pdb