Coding a linux disassembler
- #CODING A LINUX DISASSEMBLER HOW TO#
- #CODING A LINUX DISASSEMBLER INSTALL#
- #CODING A LINUX DISASSEMBLER CODE#
#CODING A LINUX DISASSEMBLER CODE#
The disassembly of our code is usually at the. In summary, there were a total of 15 functions from executable sections: Disassembly of section. The result shows the disassembly code of each function. The output should give us this disassembly result: To get an Intel syntax, we need to use the -M intel parameter, as follows: objdump -M intel -d hello > disassembly.asm What we see here is the AT&T disassembly syntax. If you notice, the disassembly syntax is different from the format of the Intel assembly language that we learned.
![coding a linux disassembler coding a linux disassembler](https://i.stack.imgur.com/GfUK2.jpg)
The output file, disassembly.asm, should contain the following code: You might need to pipe the output to a file using this command line: objdump -d hello > disassembly.asm Using the -d parameter of the objdump command, we should be able to show the disassembly of the executable code. The rest are placed there by the compiler itself, as part of its code that prepares and ends the graceful execution of our code.ĭisassembly in Linux is just a command line away. We only know of a few bits of text that we placed in our C code. The last portion of the list contains names of sections of the file. The first two lines also show what libraries are used by the program: /lib/ld-linux.so.2 The first portion of the list contained our message and the compiler information. The strings are listed in order from the start of the file. This command will produce something like the following output: /lib/ld-linux.so.2 Next stop, let's take a quick look at text strings with the strings command: ELF files are native executables on Linux platforms. dlroW olleHĪs an example of good practice, the process of reversing a program first needs to start with proper identification. The hello file is our Linux executable that displays a message in the console. To compile and run the program, use the following commands: You can use vim as your text editor by running vi from the Terminal. Open any text editor and type the lines of following code, saving it as hello.c: #include The C program compiler, gcc, is usually pre-installed in Linux.
#CODING A LINUX DISASSEMBLER INSTALL#
This may require you to enter your super user password: sudo apt install gcc Open a Terminal and enter the following command. Before anything else, we need to make sure that the tools required to build it are installed.
![coding a linux disassembler coding a linux disassembler](http://www.lockett.ca/logic65/images/logic65_system_overview.png)
To begin with, let's create a hello world program.
#CODING A LINUX DISASSEMBLER HOW TO#
This article will discuss how to reverse an ELF file by exploring the reversing tools. I might check that out again sometime when they're done.Learn how to reverse engineer a Linux executable – hello world in this article by Reginald Wong, a lead anti-malware researcher at Vipre Security, a J2 Global company, covering various security technologies focused on attacks and malware.Ī lot of our tools work great in Linux. Googling brought me to Kdbg, but it seems unmaintained, although the page says they're working on porting it to KDE4. After some hours in gdb you can get frustrated, so please excuse my rant above The recent task was to defuse a "code bomb", which I had to disassemble, of course. I do have some knowledge of asm and some coding/calling conventions on this level. We didn't start with disassembling of course. Maybe I should have elaborated a bit more on what I'm doing in the first place im my original post: this is homework from the semester course "Computer architecture and system programming". It feels like I'm using stuff from the 80's. "display" makes it a bit easier, of course, but it's not really sufficient. I'd just like to be able to concentrate on what the app is doing instead of searching for all the data I need after each and every step. I just find it tedious to work with, because I can't see all my information (registers, stack, stuff stack and registers reference to, etc.) in a nice, formatted way at one glance. Well, as I stated in the OP, I am using gdb.