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From:	"Dave Korn" <dk AT artimi DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: Re[2]: Compiling DLLs to be used from native Win32 application
Date:	Mon, 21 Jun 2004 17:19:07 +0100
MIME-Version:	1.0
In-Reply-To:	<1626130083.20040621200059@SECURITY.NNOV.RU>
Message-ID:	<NUTMEGJv1yebu6CN69R0000049c@NUTMEG.CAM.ARTIMI.COM>
X-OriginalArrivalTime:	21 Jun 2004 16:19:07.0421 (UTC) FILETIME=[7A300CD0:01C457AB]

> -----Original Message-----
> From: cygwin-owner On Behalf Of 3APA3A
> Sent: 21 June 2004 17:01

> >>  2. If I try to use it from native application it hangs on 
> LoadLibrary.
> >>  3. I did DllMain function with impure_ptr initialization 
> and finally
> >>     compiled as described in FAQ.
> >>  4. Now  DLL loads and simple functions (for example 
> strcpy()/ctrcat()
> >>     based) work OK, but any "syscall" from DLL to cygwin 
> function (for
> >>     example printf()) causes NULL pointer reference.
> >>
> >>  Is subj possible? May be some additional initialization 
> is required?
> 
> IP> Does <http://cygwin.com/ml/cygwin/2004-06/msg00274.html> help?
> 
> No.  I  do  not  want to compile application with 
> cygwin1.dll. I want to
> load library dynamically. But I'll look into crt code anyway.


  IIRC, it isn't valid to call LoadLibrary on cygwin1.dll; it's not a
supported mode of operation.  Therefore you also can't LoadLibrary a
cygwin-based dll except from a cygwin-native app that has cygwin1.dll loaded
all the way along from process startup, because that'll end up implicitly
calling LL on the cygwin dll to satisfy the imports for your cygwin-based
dll.

  Got any exciting new vuln reports coming up soon then?  Found a security
hole or three in cygwin?

    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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