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:

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=supportNote 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

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