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From Ronald Bernhardt <Ronald.Bernha...@de.bosch.com>
Subject mod_isapi/8563: Apache crashes when using precached isapi-dll (ISAPICacheFile)
Date Wed, 17 Oct 2001 11:03:51 GMT

>Number:         8563
>Category:       mod_isapi
>Synopsis:       Apache crashes when using precached isapi-dll (ISAPICacheFile)
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Oct 17 04:10:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Ronald.Bernhardt@de.bosch.com
>Release:        2.016 (beta)
>Organization:
apache
>Environment:
Windows 2000, sp2; VC++ 6.0
>Description:
Apache crashes when an isapi exention dll that exports the cleanup method TerminateExtension
is precached by means of ISAPICacheFile statement in the config-file. This is because Apache
read and executes the config file twice. When cleaning up the isapi-dll is first unloaded
and than Apache tries to execute TerminateExtension, which clearly fails.
>How-To-Repeat:
Precache an Isapi-Extension dll e.g. IIS-Sample "Simple" included in Plattform SDK Samples
(Plattform SDK\samples\web\iis\isapi\extension\simple). 

In httpd.conf:
AddHandler isapi-isa .dll
ISAPICacheFile C:\Apache2.0\cgi-bin\simple.dll


>Fix:
the cleanup handlers (dll unload / TerminateExtension) for isapi-dll should be inserted in
different order in the cleanup list und therefore executed in different order
>Release-Note:
>Audit-Trail:
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