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And to be honest i have no idea about what i should do now. I first tried to install gdb itself on the the qemu emulator.
When i run gdb my elf i can see that gdb was automatically configured as mips-linux-gnu. The info files gives me the right informations i disassembled the elf with IDA so i can confirm. I waited about 10 architectkre and nothing happened. Normally the program should print a string “Usage: Then i tried with gdbserver on the emulator and a gdb configured for a mipsel processor on the host machine but it didn’t work.
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I may do something wrong or stupid because i’m quite confused. If anybody can tell me what’s wrong in my process or if someone tried to run myelf fileI would know how he did in order to be able to run any program on different machine.
QEMU is an emulator for various architectures. Generally, it’s used to emulate an entire PC i. However, for debugging a single program this is not necessary. Additionally, the GDB which is installed by default for Ubuntu and similar operating systems does not know octdon about other architectures.
Luckily, there is a gdb-multiarch packages which does!
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Finally, Linux generally relies on the shebang! For binary files, there is no such standard. In order to fill this void, the binfmt package can be used to look at what type a file is, and automatically invoke the correct interpreter. In our case, it fieltype see that you’re trying to run a little-endian MIPS mipsel binary and invoke qemu-mipsel. However, the one you linked to relies on external libraries. If it were statically linked, you could run it now.
You can create an example binary to demonstrate this:. Archietcture your chosen binary is dynamically linked, you will need to install libraries like libc. We also need to tell binfmt where to find them.
Luckily, Debian which Ubuntu is based off of does provide packages, and these packages are compatible with Ubuntu. Rpocessor us once again, as a different Debian derivative, Embedded Debian emdebian does provide those packages. You can add both repositories to your Ubuntu or other Debian-based distro with the command below.
When you are done installing the packages see belowI highly recommend removing the file emdebian. While the Emdebian packages are compatible, apt does weird things and may elect to use a Debian package instead of the one your distro is supposed to.
If you need to install more architecrure later, you can just architrcture it again. Now we can install packages! The package which includes all of the mipsel libraries you need to run the binary you selected is.
Very finally, we need to tell binfmt where the libraries are for mipsel binaries. The quickest thing to do is to be able to cavim strace on the binary. You can do this with:. You should’ve seen from running the binary, and from stracethat this binary attempts to call ptrace procrssor itself.
This is one of the limitations of qemu-useris that ptrace is not supported. If the binary needs to ptrace itself, you will need to build a full QEMU system image.
I generally use the ones available here. You can easily remove the ptrace call from the binary it’s anti-debugging stuffand it runs fine. However, I think this is part of the crackme: You can now debug as you normally would. Note that since you’re running inside of qemu-usersome commands my not work as expected. In particular, info proc maps doesn’t work.
You may want to take a look at my pwndbg project, which works around some of these limitations. This script fullys automate everything that is automatable for you: Buildroot downloads and compiles the entire target filesystem for us, uncluding gdbserverand also the host QEMU and gdb. Major steps covered below. Forward a host port to the QEMU target with the command line options here to Launch the cross compiled GDB from host and point it to the cross compiled executable and the forwarded port:.
You can see bellow the output of file myelf: According to this sitei downloaded the following kernel image and initrds: Type “show copying” and “show warranty” for details. This GDB was configured as “mips-linux-gnu”. For bug reporting instructions, please see: ABI-tag 0x – 0xc is.
Thank you, have a good day! Zach Riggle 1, 8 Get Ready for an Adventure! You need a few things for your quest! Let’s start at the beginning.
You can create an example binary to demonstrate this: Libraries Since your chosen binary is dynamically linked, you will need to install libraries like libc. You can do this with: First of all thank you for your so complete answer! I installed binfmt by: I removed my cross-compiler so i didn’t test the statically-linked Ocgeon.
I then followed every step but when i wanted to tell to binfmt where are the librairies for mipsel binaries. But when i try to run. No such file caavium directory I m lost the problem is from the linking?
Thanks in advance, i will test for a statically-linked binaries waiting your answer. Even if i couldn’t fix the problem above.
But i have a warning: Unable to find dynamic linker breakpoint function. GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code. Going step by step into the programm, i find the instructions different comparing the instructions by disassembling the elf file with IDA.
Anyway thanks for your help.
OCTEON III CN7XXX Multi-Core MIPS64 Processors
I’ve added a comment to that effect. ZachRiggle When I try to install gcc And when I try to install cpp You can try to connect remote gdbserver using radare2 tool, with a following line: Anton Kochkov 3 9. The “only” things that cxvium now left now are to: But note that those steps are also required procfssor the userland method. The major steps done by my script are: Enable gdbserver for on the Buildroot configuration: Sign up or log in Sign up using Google.
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