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

[Thomas Huth]

This is an automated cleanup. This bug report has been moved
to QEMU's new bug tracker on gitlab.com and thus gets marked
as 'expired' now. Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/67


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

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #67
   https://gitlab.com/qemu-project/qemu/-/issues/67

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

Title:
  incomplete emulation of fstenv under TCG

Status in QEMU:
  Expired

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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