Questions tagged [qemu]

QEMU is a software that performs CPU emulation through dynamic binary translation. It allows the execution of applications compiled for a certain specific architecture to run on other architectures.

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Extracted router file execution

I am trying to run an executable file that I dug out from an extracted file system of a DSL modem router. So first of all I needed to either have a MIPS Linux box or take the emulation path. After ...
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0answers
1k views

I'm trying to debug small mips code snippets in IDA with QEMU as debugger, but only NOP instructions show when I start the process

I followed the tutorial IDA Help: Debugging code snippets with QEMU. It always worked with ARM code, but now I have to reverse some MIPS and only nops are displayed like this: Should I adjust ...
4
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0answers
92 views

QEMU Translation block

I'm studying how QEMU translates native basic blocks and runs them. As far as I understand, it reads native basic blocks then retranslates them, but I wonder how it can deal with exceptions inside, so ...
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0answers
283 views

Using GDB to trace guest OS inside a hypervisor, the whole running on Qemu - kvm

I use Gdb to trace the execution (breakpoint, single stepping, ...) of a hypervisor OS in Qemu and it works fine so far. qemu-system-x86_64 -enable-kvm -display sdl -cpu host -serial my: stdio -m ...
4
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0answers
1k views

Emulate TP-Link WR841N using Qemu

I have downloaded a few different versions of the firmware from the TP-Link website. I've been piecing together details on how to achieve this but I'm missing some key points. Following instructions ...
3
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0answers
1k views

LD_PRELOAD in QEMU user space emulation

I was trying to emulate a firmware and as a part of the process I was interested in knowing what device files are being registered using mknod. In order to intercept those calls I had created a shared ...
3
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0answers
326 views

Running vmlinux ELF under QEMU

I have a vmlinux ELF file to run under QEMU. My arguments to qemu-system-arm.exe are: The correct -cpu argument. The versatilepb -machine which I'm not sure if it's the right choose, but can't see ...
2
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0answers
58 views

Finding (or building) a kernel for Huawei EchoLife EG8145V5

I have a Huawei EchoLife EG8145V5 for which I am trying to build some software. It has a built-in Linux distro of some sort, but I would like to add to it, as there is "plenty" of storage ...
2
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0answers
213 views

How to perform full MIPS system emulation with QEMU, using the squashfs image and uBoot kernel image?

TL;DR: Need tips on emulation of MIPS-BE system using QEMU with the help of squashfs image file and uBoot Kernel image file extracted from the firmware file. Long Version: - What I have: A cheap ...
2
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0answers
55 views

QEMU with GDB: Stepping Instruction causes Windows VM BSOD

I'm currently analyzing a piece of software inside a Windows 10 QEMU virtual machine which is connected to a remote GDB debugger. I have set breakpoints to audit what the application is doing. I have ...
2
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0answers
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IDA Pro GDB QEMU Tricore setup

I have added the lines below to IDA 6.95\cfg\gdb_arch.cfg to try to get QEMU Tricore debugging in IDA Pro, using an ARM tutorial as the basis (page 2): https://www.hex-rays.com/products/ida/support/...
2
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0answers
2k views

Using QEMU to boot arm uImage kernel

I'm currently trying to reverse engineer the firmware for the Swann DVR16-4500 security camera system. I successfully extracted the cramfs filesystem and now I have the following files inside the ...
2
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0answers
820 views

When to use qemu user mode versus system mode?

This seems to be a pretty basic question but I can't seem to find a good answer. I am currently just following https://w00tsec.blogspot.ca/2013/09/analyzing-and-running-binaries-from.html to learn ...
2
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0answers
1k views

USB not showing up on QNX in Qemu

I have spent some time reverse engineering a QNX 6.5.0 based system. I am pretty new to the Linux (Ubuntu) world and definitely new to QNX, Qemu, and embedded systems. Since the hardware is fairly ...
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0answers
37 views

Handle Ioctl call while running with qemu

I am using qemu to emulate a binary like this qemu -strace XXXXX . I saw that the first 2 system calls of this process were TCGETS to stdin and stdout. From man pages Get and set terminal attributes ...
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0answers
160 views

Strange behaviour debugging Android ARM binary with gdbserver

I'm trying to run this armv5 binary from OWASP's mobile security guide (validate) using Android Studio's emulator on my x86_64 machine. I'm seeing very weird behaviour and would appreciate any ...
1
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0answers
158 views

Debugging arbitrary ARM binary image using IDA and QEMU

i'm new to this and still learning a lot. Now i have managed to download the binary image from an Flash memory out of a unit having an OMAP5912 SoC. The SoC has an ARM9 family CPU core running little ...
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0answers
96 views

How can I emulate Huawei routers HG5xx firmware?

i want to pentest some HG routers in a way that i can try every thing without worrying if it would damage the router or not .... and a better view of debugging the actions .
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0answers
1k views

Debugging MIPS Binaries on Ubuntu 64-bit (version 14.04)

I have a MIPS 32-bit MSB binary and I can disassemble the code with IDA Pro and decompile it successfully with ReTargetable Decompiler. In order to understand the binary much better, I need to debug ...
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0answers
276 views

All data in IDA Pro turns into zeros when using QEMU

I'm trying to emulate a snippet of ARM assembly I have in IDA pro using QEMU. However I do not understand the output of the program. When I start debugging the firmware, windows pop up for QEMU. ...
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0answers
1k views

Reverse Engineer firmware for Jffs2 filesystem in Qemu

I am looking at the firmware for my router C1000A/C1000A-D and I am having some difficulties in mounting and otherwise emulating this. From what I have read, the general process for reverse ...
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0answers
565 views

Debug function in MIPS .ko file (with IDA and Qemu)

I have a .ko file which I grabbed from a router (MSB MIPS), and I'm trying to debug a specific function inside it with IDA. Since i can't just "run" the ko file with QEmu, I tried to change its ...
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0answers
356 views

qemu and gdb error: could not load xml document

I'm trying to debug an application using Qemu for AARCH64 ./qemu-arm64-static -g 1234 file.bin When running GDB and connecting to the remote host, I get the following error message: $ ./aarch64-...
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1answer
143 views

Running ELF file built for ARM arhitecture

My goal is to run and debug ELF file (c444) which is compiled for the ARM architecture. I have some experience with x32 and x64 Intel architectures. However, I down know how to proceed with ARM-based ...
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0answers
61 views

QEMU & Firmware inside Docker

I am currently trying to run a router firmware via qemu inside a docker container. I'm using multiarch/qemu-user-static:x86_64-mips. Here is my Dockerfile: FROM multiarch/qemu-user-static:x86_64-mips ...
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0answers
46 views

Emulator that emulates arm hardware

I want to hook arm instructions as they executes but most of the emulators are based on VirtualBox that uses houdini to translate arm instructions to x86, and i really can't hook a native JNI lib, ...