Message-ID: <4DBB1E2B.6090701@t-online.de>
Date: Fri, 29 Apr 2011 22:23:07 +0200
From: Christian Franke <Christian.Franke@t-online.de>
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To: cygwin@cygwin.com
Subject: Re: False positive from access("/proc/registry/...", F_OK)
References: <1QF1xL-1RJrwe0@fwd09.aul.t-online.de> <20110427140851.GU3324@calimero.vinschen.de>
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Corinna Vinschen wrote:
> On Apr 27 12:26, Christian Franke wrote:
>    
>> Problem was likely introduced by fhandler_registry.cc change 1.52:
>>
>>   fhandler_registry::exists ()
>>   ...
>>     if (!val_only)
>>       hKey = open_key (path, KEY_READ, wow64, false);
>>   - if (hKey != (HKEY) INVALID_HANDLE_VALUE)
>>   + if (hKey != (HKEY) INVALID_HANDLE_VALUE || get_errno () == EACCES)
>>       file_type = 1;
>>     else
>>
>> open_key() returns INVALID_HANDLE_VALUE and EACCESS also if an upper
>> level key cannot be opened. The exists() function returns 1
>> (virt_directory) then, it should return 0 (virt_none).
>>      
> I don't remember anymore why I did that and naturally I also didn't
> write a comment.
>    

:-)

I presume this fixed the access-denied-on-last-component case:

"/proc/registry/HKEY_LOCAL_MACHINE/SECURITY" -> filetype = 1 (OK)

but unfortunately then the same info is returned for all ".../SECURITY/*".


> But what you say sounds right to me.  Please create a patch.
>
>    

I'll try next week. A fix likely needs to enhance open_key() such that 
it returns info whether the access was denied on last component or not.

Christian


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