DOCUMENT:Q264224 08-AUG-2001 [winnt] TITLE :Finding the Checksum Value of a Driver Using the Kernel Debugger PRODUCT :Microsoft Windows NT PROD/VER:WINDOWS:2000; winnt:4.0 OPER/SYS: KEYWORDS:kbenv kberrmsg ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Advanced Server ------------------------------------------------------------------------------- SUMMARY ======= When you debug a Windows NT-based server with a kernel debugger, it is frequently necessary to obtain the checksum value for a driver. This article describes how to find the checksum value for a driver. MORE INFORMATION ================ You can obtain the checksum value through the kernel debugger by taking the base address of the driver and looking at offset 0xd8: 1. To find the base address of the driver or executable file for which you are interested in obtaining the checksum, use the !drivers command. Output similar to the following example is displayed: 0: kd> !drivers !drivers Loaded System Driver Summary Base Code Size Data Size Driver Name Creation Time f78f4000 3afe0 ( 235 kb) 5c40 ( 23 kb) rdr.sys Thu Sep 23 06:09:18 1999 NOTE: In this example the base address for the Rdr.sys file is at 0xf78f4000. 2. Add the offset 0xd8 to find the address of the checksum field in the driver's image header: 0: kd> dd f78f4000+d8 l1 dd f78f4000+0xd8 l1 f78f40d8 000497ae NOTE: The checksum value in this example is 0x497ae for the Rdr.sys file. To obtain the checksum of a dynamic-link library (DLL), use the !dlls -a command to display all image header information (which includes the checksum value). For additional information, click the article number below to view the article in the Microsoft Knowledge Base: Q148658 How to Load Windows NT MEMORY.DMP File Using I386KD.EXE Additional query words: timestamp link -headers -dump ====================================================================== Keywords : kbenv kberrmsg Technology : kbWinNTsearch kbWinNT400search kbwin2000AdvServ kbwin2000AdvServSearch kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch Version : WINDOWS:2000; winnt:4.0 Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.