[Bug 26268] Multiple applications need ntdll.ZwSetLdtEntries stub (kwiksupport.me, Ragnarok Online patcher)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=26268

Anastasius Focht <focht at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                URL|                            |http://www.kwiksupport.me/f
                   |                            |ileadmin/kwiksupport/kwiksu
                   |                            |pport_setup.exe
           Keywords|                            |download, obfuscation
           Hardware|Other                       |x86
                 CC|                            |focht at gmx.net
     Ever confirmed|0                           |1
            Summary|ruro.exe (Ragnarok Online   |Multiple applications need
                   |patcher) needs              |ntdll.ZwSetLdtEntries stub
                   |ntdll.ZwSetLdtEntries       |(kwiksupport.me, Ragnarok
                   |                            |Online patcher)
           Severity|enhancement                 |normal

--- Comment #8 from Anastasius Focht <focht at gmx.net> ---
Hello folks,

confirming, still present.

Another app which needs this: 'kwiksupport.me' remote support tool (crash
reported via appdb)

Download: http://www.kwiksupport.me/fileadmin/kwiksupport/kwiksupport_setup.exe

--- snip ---
$ pwd
/home/focht/.wine/drive_c/Program Files/pcvisit Software AG/kwiksupport.me

$ wine ./caloa_app.exe
...
Unhandled exception: unimplemented function ntdll.dll.ZwSetLdtEntries called in
32-bit code (0x7bc445c8).
Register dump:
 CS:0023 SS:002b DS:002b ES:002b FS:0063 GS:006b
 EIP:7bc445c8 ESP:01a2f51c EBP:01a2f580 EFLAGS:00200216(   - --  I   -A-P- )
 EAX:01a2f528 EBX:7bcd1000 ECX:7bc9f100 EDX:00000000
 ESI:00000001 EDI:00000009
Stack dump:
0x01a2f51c:  7ffd8000 7bc211f8 001105b8 80000100
0x01a2f52c:  00000001 00000000 7bc445c8 00000002
0x01a2f53c:  7bc9f100 7bca0405 01a2f5a8 01a2f598
0x01a2f54c:  7b85a846 7b8ba000 01a2fa78 7b8260a1
0x01a2f55c:  7b85a846 7bc10000 01a2f578 00000000
0x01a2f56c:  01a2f580 00000002 008f95f8 0010000f
000c: sel=0067 base=00000000 limit=00000000 16-bit --x
Backtrace:
=>0 0x7bc445c8 __wine_spec_unimplemented_stub+0x4e(module="ntdll.dll",
function="ZwSetLdtEntries")
[/home/focht/projects/wine/wine-git/dlls/ntdll/exception.c:288] in ntdll
(0x01a2f580)
  1 0x7bc21221 __wine_stub_ZwSetLdtEntries+0x28() in ntdll (0x01a2f5e8)
  2   in caloa_app (+0x261095) (0x01a2f5e8)
  3 0x00661109 in caloa_app (+0x261108) (0x01a2f6f0)
...
Modules:
Module    Address            Debug info    Name (123 modules)
PE      400000- 1098000    Export          caloa_app
...
Threads:
process  tid      prio (all id:s are in hex)
00000008 (D) C:\Program Files\pcvisit Software AG\kwiksupport.me\caloa_app.exe
    00000024    0
    00000023    1
    00000009    0 <==
--- snip ---

The app doesn't need a real implementation.
The call is part of tests for VM environments (VMWare etc).

Source:
http://source.winehq.org/git/wine.git/blob/5472b9f9ca1a393c0153e256da67798a3afe53c7:/dlls/ntdll/ntdll.spec#l335

--- snip ---
 335 @ stub NtSetLdtEntries
--- snip ---

For more serious approach:

https://src.chromium.org/native_client/trunk/src/native_client/src/trusted/service_runtime/win/nacl_ldt.c
(Google Chromium/NACL code dealing with LDT)

$ sha1sum kwiksupport_setup.exe 
7a84fe399417326173edd2d3056b15a8d970d5e8  kwiksupport_setup.exe

$ du -sh kwiksupport_setup.exe 
19M    kwiksupport_setup.exe

$ wine --version
wine-1.7.11-159-gee33839

Regards

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