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Date: Wed, 21 Apr 2021 17:58:16 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
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To: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>, cygwin AT cygwin DOT com
Subject: Re: Cannot access system32 directory from 32 bit cygwin after the
 commit 456c3a46
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Greetings, Corinna Vinschen via Cygwin!

> On Apr 21 12:04, Takashi Yano via Cygwin wrote:
>> Hi Corinna,
>> 
>> I noticed the problem that /cygdrive/c/Windows/System32 directory
>> can be no longer accessed from 32 bit cygwin (WOW64) after the
>> commit:

> The problem here is the File System Redirector,
> https://docs.microsoft.com/en-us/windows/win32/winprog64/file-system-redirector

> This thing is really a problem because it break every, otherwise
> sane assumption.  Hmm, bummer.  I need some time to think about
> a solution here.

As far as I'm aware, it can be disabled on application request.
I know at least one 32-bit application (Far Manager) that works through
redirector, but it might not be as easy for a library.

>> 
>> commit 456c3a46386f38887407603b2c64b7f63a4871c5
>> Author: Corinna Vinschen <corinna AT vinschen DOT de>
>> Date:   Mon Apr 19 14:49:14 2021 +0200
>> 
>>     Cygwin: path_conv: Try to handle native symlinks more sanely
>> 
>>     For local paths, add a check if the inner path components contain native
>>     symlinks or junctions.  Compare the incoming path with the path returned
>>     by NtQueryInformationFile(FileNameInformation).  If they differ, there
>>     must be at least one native symlink or junction in the path.  If so,
>>     treat the currently evaluated file as non-existant.  This forces
>>     path_conv::check to backtrack inner path components until we eliminated
>>     all native symlinks or junctions and have a normalized path.
>> 
>>     Signed-off-by: Corinna Vinschen <corinna AT vinschen DOT de>
>> 
>> Reverting this commit resolves the issue.
>> 
>> 64 bit cygwin does not seem to be affected. Could you please
>> have a look?


-- 
With best regards,
Andrey Repin
Wednesday, April 21, 2021 17:54:23

Sorry for my terrible english...


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