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[Qemu-devel] FPU x86 instructions error

From: Clemens Kolbitsch
Subject: [Qemu-devel] FPU x86 instructions error
Date: Fri, 24 May 2013 14:39:09 -0700

Hi guys,

we recently had an issue with running a program using FPU instructions
to obtain the current EIP (basically a weird way of "call 0; pop eax")
that was not working on QEMU (with TCG).

Looking at the problem, we found this patch to be useful/fixing the issue:


Looking through the DEVEL archives, I found this patch


that adds the FPU flags to the environment, but is only using them for KVM.

I was wondering - since the above patch is rather old, you have
probably come across it before - if there was a reason for not
including it in QEMU (I checked in git:master and it's not applied).
If there isn't, maybe it'd be worth re-considering :)


Clemens Kolbitsch
Security Researcher

Lastline, Inc.
6950 Hollister Avenue, Suite 101
Goleta, CA 93117


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