Crash confuses me

Graham graham at
Sat Mar 9 08:09:24 CST 2013

On 09/03/13 06:03, Marcus Meissner wrote:
> On Sat, Mar 09, 2013 at 01:40:00AM +0000, Graham wrote:
>> On 08/03/13 22:40, Francois Gouget wrote:
>>> On Fri, 8 Mar 2013, Marcus Meissner wrote:
>>> [...]
>>>> "real NOVICE" and using LD_PRELOAD or "hotpatching" does not fit together for me...?
>>>> - wine uses it own elfloader, which might cause issues.
>>> Really? I thought it used the standard elf loader hence the need for 
>>> tricks to get the native libraries to load in the right place. What it 
>>> does have however is its own PE loader. Not sure if it's relevant here.
>> the functions i detoured in were LoadLibrary and
>> FreeLibrary, the question still remains how its even possible, this
>> should be a fairly straight-forward thing to answer for you developers,
>> i would had thought.  If its too much to understand , please say :/
>> i put code which detours LoadLibrary and FreeLibrary in
>> , but the code only runs at a later certain time after program execution
>> ... ( trigger is actually a certain library loaded, i detect it in dlsym
>> ) ... But in wine 1.4.1 the program crashes at a time earlier than the
>> triggered detour, understand??  This don't seem physically possible, any
>> explanation?
> In loader/preloader.c is our own pre-elf-loader, which handles the specific address
> space layouts we use.
> All the library loading is very magic even to me and I have to understand it anew
> every time ;)
> Why not just patch the Wine source itself and build a specific Wine version for
> your problem? This makes it easier and avoids need of preloading tricks.
> You probably also want to patch LdrLoadDll in ntdll.
> Ciao, Marcus

That helps, cheers all. And Good Luck with the continuation of this
awesome software

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