QEMU DANGER x86 README

QEMU DANGER x86 is a revision of QEMU. This allows you to ignore/revise virtual x86/64 CPU privileges!

For example, a Ring3 program can execute Ring0 instructions or read and write DATA!

We will research together with WindowsDanger and LinuxDanger.

Magic Instructions for Debugging

Capture output values at I/O ports "233" and "0x2333" and output "\a" or a prompt to the terminal.

Stack Dump: E399h

mov dx, 2333h; Destination->Magic I/O Port
mov ax, E399h; Command->Stack Dump
mov bx, 16; Stack->Dump Size
out dx, ax; TRIGGER!!

Just Alert

For example, execute the following in WinXP's CMD:

debug
-o e9 e9

Then execute:

mov dx, 2333h
mov ax, 2333h
out dx, ax

And "\a" will be output.

QEMU

QEMU is a generic and open source machine & userspace emulator and virtualizer.

QEMU is capable of emulating a complete machine in software without any need for hardware virtualization support. By using dynamic translation, it achieves very good performance. QEMU can also integrate with the Xen and KVM hypervisors to provide emulated hardware while allowing the hypervisor to manage the CPU. With hypervisor support, QEMU can achieve near native performance for CPUs. When QEMU emulates CPUs directly it is capable of running operating systems made for one machine (e.g. an ARMv7 board) on a different machine (e.g. an x86_64 PC board).

QEMU is also capable of providing userspace API virtualization for Linux and BSD kernel interfaces. This allows binaries compiled against one architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a different architecture ABI (e.g. the Linux x86_64 ABI). This does not involve any hardware emulation, simply CPU and syscall emulation.

QEMU aims to fit into a variety of use cases. It can be invoked directly by users wishing to have full control over its behaviour and settings. It also aims to facilitate integration into higher level management layers, by providing a stable command line interface and monitor API. It is commonly invoked indirectly via the libvirt library when using open source applications such as oVirt, OpenStack and virt-manager.

QEMU as a whole is released under the GNU General Public License, version 2. For full licensing details, consult the LICENSE file.

Documentation

Documentation can be found hosted online at [https://www.qemu.org/documentation/]. The documentation for the current development version that is available at [https://www.qemu.org/docs/master/] is generated from the docs/ folder in the source tree, and is built by Sphinx.

Building

QEMU is multi-platform software intended to be buildable on all modern Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety of other UNIX targets. The simple steps to build QEMU are:

if you are building on a Mac:

brew install pkg-config glib libtool automake autoconf pixman ninja sdl2
pip3 install meson

mkdir build
cd build
../configure
make -j8

Additional information can also be found online via the QEMU website:

• Hosts/Linux
• Hosts/Mac
• Hosts/W32