Symptoms
You have an application that is configured to be built for an x64 platform by using the Msvcr90.dll file. The application calls the strncpy function. When you run the application, you may receive the following error message in the Visual Studio Just-In-Time Debugger window:
Note
An unhandled win32 exception occured in 'application_name'
When you check the call stack, you may find an access violation was triggered in the Msvcr90.dll file and that the application stopped responding in the strncpy function. This problem occurs when the following conditions are true:
- The source buffer extends to the end of an allocated page.
- The next byte after this page does not belong to the running process.
- The length to be copied is an even multiple of 8.
- The length to be copied includes the final byte of the source buffer.
Cause
This problem occurs because the strncpy function tries to access the next byte after the source buffer. This issue is introduced by new optimizations to some CRT library functions.
Resolution
Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2008 service pack that contains this hotfix.
To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
Prerequisites
You must have Visual Studio 2008 Service Pack 1 installed to apply this hotfix.
Restart requirement
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Atl90.dll | 9.0.30729.162 | 159,552 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90.dll | 9.0.30729.162 | 5,084,480 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90.dll | 9.0.30729.162 | 3,766,080 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90chs.dll | 9.0.30729.162 | 36,680 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90chs.dll | 9.0.30729.162 | 36,680 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90cht.dll | 9.0.30729.162 | 37,704 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90cht.dll | 9.0.30729.162 | 37,704 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90d.dll | 9.0.30729.162 | 7,419,200 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90d.dll | 9.0.30729.162 | 5,934,912 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90deu.dll | 9.0.30729.162 | 64,328 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90deu.dll | 9.0.30729.162 | 64,328 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90enu.dll | 9.0.30729.162 | 54,600 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90enu.dll | 9.0.30729.162 | 54,600 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90esn.dll | 9.0.30729.162 | 62,792 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90esn.dll | 9.0.30729.162 | 62,792 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90esp.dll | 9.0.30729.162 | 62,792 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90esp.dll | 9.0.30729.162 | 62,792 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90fra.dll | 9.0.30729.162 | 63,816 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90fra.dll | 9.0.30729.162 | 63,816 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90ita.dll | 9.0.30729.162 | 62,280 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90ita.dll | 9.0.30729.162 | 62,280 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90jpn.dll | 9.0.30729.162 | 44,360 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90jpn.dll | 9.0.30729.162 | 44,360 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90kor.dll | 9.0.30729.162 | 43,848 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90kor.dll | 9.0.30729.162 | 43,848 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90u.dll | 9.0.30729.162 | 5,103,424 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90u.dll | 9.0.30729.162 | 3,781,440 | 14-Oct-2008 | 02:32 | x86 |
| Mfc90ud.dll | 9.0.30729.162 | 7,464,264 | 14-Oct-2008 | 01:12 | x64 |
| Mfc90ud.dll | 9.0.30729.162 | 5,980,488 | 14-Oct-2008 | 02:32 | x86 |
| Mfcm90.dll | 9.0.30729.162 | 67,072 | 14-Oct-2008 | 00:50 | x64 |
| Mfcm90.dll | 9.0.30729.162 | 59,904 | 14-Oct-2008 | 00:20 | x86 |
| Mfcm90d.dll | 9.0.30729.162 | 93,184 | 14-Oct-2008 | 00:50 | x64 |
| Mfcm90d.dll | 9.0.30729.162 | 80,896 | 14-Oct-2008 | 00:20 | x86 |
| Mfcm90u.dll | 9.0.30729.162 | 67,072 | 14-Oct-2008 | 00:50 | x64 |
| Mfcm90u.dll | 9.0.30729.162 | 59,904 | 14-Oct-2008 | 00:20 | x86 |
| Mfcm90ud.dll | 9.0.30729.162 | 93,696 | 14-Oct-2008 | 00:50 | x64 |
| Mfcm90ud.dll | 9.0.30729.162 | 80,896 | 14-Oct-2008 | 00:20 | x86 |
| Mfcmifc80u.dll | 9.0.30729.162 | 14,152 | 20-Oct-2008 | 17:19 | x86 |
| Microsoft.visualc.stlclr.dll | 9.0.30729.162 | 49,000 | 20-Oct-2008 | 17:19 | x86 |
| Msvcm90.dll | 9.0.30729.162 | 225,280 | 13-Oct-2008 | 21:59 | x86 |
| Msvcm90.dll | 9.0.30729.162 | 324,096 | 13-Oct-2008 | 22:36 | IA-64 |
| Msvcm90.dll | 9.0.30729.162 | 245,760 | 13-Oct-2008 | 23:40 | x64 |
| Msvcm90d.dll | 9.0.30729.162 | 312,832 | 13-Oct-2008 | 21:59 | x86 |
| Msvcm90d.dll | 9.0.30729.162 | 429,568 | 13-Oct-2008 | 22:37 | IA-64 |
| Msvcm90d.dll | 9.0.30729.162 | 333,312 | 13-Oct-2008 | 23:40 | x64 |
| Msvcp90.dll | 9.0.30729.162 | 1,467,208 | 14-Oct-2008 | 00:56 | IA-64 |
| Msvcp90.dll | 9.0.30729.162 | 854,344 | 14-Oct-2008 | 01:12 | x64 |
| Msvcp90.dll | 9.0.30729.162 | 570,696 | 14-Oct-2008 | 02:32 | x86 |
| Msvcp90d.dll | 9.0.30729.162 | 2,514,760 | 14-Oct-2008 | 00:56 | IA-64 |
| Msvcp90d.dll | 9.0.30729.162 | 1,121,608 | 14-Oct-2008 | 01:12 | x64 |
| Msvcp90d.dll | 9.0.30729.162 | 873,288 | 14-Oct-2008 | 02:32 | x86 |
| Msvcr90.dll | 9.0.30729.162 | 1,504,584 | 14-Oct-2008 | 00:56 | IA-64 |
| Msvcr90.dll | 9.0.30729.162 | 624,456 | 14-Oct-2008 | 01:12 | x64 |
| Msvcr90.dll | 9.0.30729.162 | 653,640 | 14-Oct-2008 | 02:32 | x86 |
| Msvcr90d.dll | 9.0.30729.162 | 3,599,688 | 14-Oct-2008 | 00:56 | IA-64 |
| Msvcr90d.dll | 9.0.30729.162 | 1,349,960 | 14-Oct-2008 | 01:12 | x64 |
| Msvcr90d.dll | 9.0.30729.162 | 1,178,440 | 14-Oct-2008 | 02:32 | x86 |
| Vcomp90.dll | 9.0.30729.162 | 142,664 | 14-Oct-2008 | 00:56 | IA-64 |
| Vcomp90.dll | 9.0.30729.162 | 57,672 | 14-Oct-2008 | 01:12 | x64 |
| Vcomp90.dll | 9.0.30729.162 | 52,040 | 14-Oct-2008 | 02:32 | x86 |
| Vcomp90d.dll | 9.0.30729.162 | 317,256 | 14-Oct-2008 | 00:56 | IA-64 |
| Vcomp90d.dll | 9.0.30729.162 | 105,800 | 14-Oct-2008 | 01:12 | x64 |
| Vcomp90d.dll | 9.0.30729.162 | 89,416 | 14-Oct-2008 | 02:32 | x86 |
| Vcomp90ui.dll | 9.0.30729.162 | 11,592 | 20-Oct-2008 | 17:19 | x86 |
| Vcredist_ia64.exe | 9.0.30729.162 | 4,712,272 | 14-Oct-2008 | 19:32 | x86 |
| Vcredist_x64.exe | 9.0.30729.162 | 5,236,560 | 14-Oct-2008 | 19:36 | x86 |
| Vcredist_x86.exe | 9.0.30729.162 | 4,496,208 | 14-Oct-2008 | 19:28 | x86 |
Workaround
To work around this problem, use one of the following methods:
Change any of the four conditions that are described in the "Symptoms" section.
Replace the strncpy function with other functions that have the similar functionality, such as the memcpyfunction or the lstrcpyn function.
Note These copy functions are slightly different. For example, the memcpy function does not end the string copy when a null byte is encountered before the indicated length.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates