[Bug 661696] Re: incomplete emulation of fstenv under TCG

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/661696

Title:
  incomplete emulation of fstenv under TCG

Status in QEMU:
  Incomplete

Bug description:
  Steps to reproduce:

  1) Install Windows (tried XP and 7) in qemu (tried qemu without kvm
  and qemu-kvm).

  2) Get OllyDbg ( http://ollydbg.de/odbg200.zip ).

  3) Use some Metasploit-encoded file, example included.

  It is not a virus!

  File was generated with Metasploit, command (if i remember it right):
  `msfpayload windows/exec cmd=notepad R | msfencode -e
  x86/shikata_ga_nai -t exe -o cmd_exec_notepad.shikata_ga_nai.exe`.

  4) Launch the file under Windows in qemu, make sure it opens a
  notepad.

  5) Open file under OllyDbg, run (F9) it there. It opens a notpad.
  Close OllyDbg.

  6) Open file under OllyDbg, trace over (Ctrl+F12) it there. It fails with 
`Access violation when writing to [some address]`.
  Command: 316A 13, XOR DWORD PTR DS:[EDX+13],EBP 

  Under native Windows, the trace over command works fine.

  Under VMware the trace works fine.
  Under VirtualBox it also fails (checked in the spring).

  $ qemu-kvm --version
  QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c) 2003-2008 
Fabrice Bellard

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