Questions tagged [radare2]
Opensource reverse engineering framework to disassemble, debug, analyze, manipulate binary files and more.
0
votes
1answer
6 views
How to increment and decrement machine code in radare2?
I watched a video (I believe it was a talk by the author of radare2) of how to increment machine code in radare2 very easily, simply by hitting 'c' and then using + and - to respectively increment and ...
2
votes
1answer
32 views
How to write sequence of machine code in radare2?
I know how to write an opcode and how to increment and decrement machine code using plus and minus keys. However, how do I write a sequence of machine code at an offset?
E.g. if I want to write five ...
0
votes
2answers
85 views
crackme disassembly - are these local variables ever initialized?
I'm working on a crackme, where the objective is to find the valid password given a program. I'm using radare2 to reverse engineering the program. To do so, I need to enter a password that forces this ...
2
votes
1answer
27 views
When reopening file lose all information in radare2
I have problem with my radare2, when I try to reopen file in debug mode (ood) my radare loses all informations about that file.
any help to avoid this?
4
votes
1answer
44 views
How do I type in hex input into radare2 debug mode?
#include<stdio.h>
#include<stdlib.h>
int main() {
puts("Enter input: ");
char buf[100];
fgets(buf, 100, stdin);
printf("%s", buf);
}
Suppose I am debugging a program, such ...
3
votes
1answer
41 views
How to examine/edit stack memory contents using radare2 in debug mode?
How can i examine/edit stack contents using radare2, just like gdb ?
Is there a way to examine memory using $rbp or $rsp register like below.
x $rbp-10 <--- something like this which can dump from ...
1
vote
1answer
31 views
Passing hex strings to Radare2
I can quickly test hex string arguments in gdb like this:
r $'\x61\x61\x61\x61'
I'd like to do something similar in radare2 but all I can figure out is regular strings:
doo aaaa
I tried this but ...
1
vote
0answers
98 views
Illegal instruction fault in stack based buffer overflow
I wrote this short C program to practice buffer overflow exploits:
#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <inttypes.h>
char *decode(char *s){
...
0
votes
0answers
41 views
How to debug programs that load from another one? with radare2/gdb
I'm reversing engendering a plugin. This plugin is loaded into memory by the main program.
I disassemble the plugin with radare2 but I don't know how to debug it.
I try with gdb but same problem.
I ...
1
vote
1answer
35 views
Is there watchpoints in radare2?
Is there any way to put breakpoints in radare2 that trigger when an address is read/write?
In GDB those are call watchpoints ('rwatch' or 'awatch")
I got this from radare2
[0xB7F08810]> !dr?
...
0
votes
1answer
123 views
Reassembling reversed ASM
I am trying to reassemble code reversed from an executable using radare2. I have managed to extract the asm and am using nasm for reassembling.
The question is, the code also contains commands like
...
1
vote
1answer
29 views
What this “arw” line means when processing Mach-0 file with Radare2 or Rabin2?
Processing a Mach-0 file with Rabin2 I'm obtaining the following result:
$ rabin2 -I mybinaryfile
arw ...
2
votes
0answers
50 views
Radare2 cannot place a breakpoint on a MIPS code
I am doing a crack-me challenge, I would like to execute it to see v0 and v1 values.
This is the file command's output :
./ch27.bin: ELF 32-bit LSB executable, MIPS, MIPS32 rel2 version 1 (SYSV), ...
1
vote
1answer
61 views
debugging with radare2
I am using radare2 for disassemble an x86 binary:
$ r2 ./mynbinary
[0x00001000]> aaa
...
[0x00001000]> pdf
;-- section..text:
;-- section.LOAD1:
;-- rip:
/ (...
2
votes
1answer
107 views
How to print eax value with Radare2?
I am solving a crack me challenge but I am stuck. The challenge executes several jne tests. The first test is the simpliest but I don't arrive to print the eax value to know the content of cmp ...
1
vote
2answers
67 views
What does layout of Cutter/Radare2's function dissasembly mean?
Cutter displays functions like this:
I'm having trouble understanding the layout of the functions
For example:
What does 184 mean?
What does the green | mean at the beginning of each line?
Why ...
1
vote
1answer
79 views
How to use aaa in radare2 while in -d (debug) mode?
This might be a stupid question, but I am trying to learn by myself and I encountered a problem which I cannot solve for the life of me. I tried googling and I can't find anything relevant, so here ...
1
vote
1answer
74 views
How to set a breakpoint in an execve'd program in radare2?
If I have a program A, which uses execve to run program B. How can I set a breakpoint in program B's main routine if I'm debugging program A?
After a certain point in the execve routine, program B ...
1
vote
0answers
96 views
Password is right, but still wrong?
i am trying to find the password of a binary with radare2 - a crackme again :-)
I already thought I've found the password ('pass'), but this seems to be not the right one. Or there is a trick I didn'...
0
votes
1answer
295 views
How to print the value of register with Radare 2
I am trying to solve this ELF - Ptrace challenge. I use Radare 2. This is the commands I execute to print the assembly code.
radare2 ch3.bin
[0x080482f0]> aaa
[[anal.jmptbl] Missing cjmp bb in ...
2
votes
1answer
86 views
Radare2 does not display the entire assembler code
I am trying to solve this ELF - Ptrace crack me. Here are the commands I use :
I start radare2 with the crack me as argument.
radare2 ch3.bin
I decide to go to the main and print the assembly code ...
1
vote
1answer
93 views
Setting register names in Radare2
I am reverse-engineering an 8051 architecture program of a specific chip.
The disassembly naturally doesn't contain any function names, and the register names are minimal. For example, address 0xb3 is ...
0
votes
1answer
72 views
how to use core file in radare2?
In gdb i can backtrace with core file and executable file.
It seems radare2 can read core file. like this
$ r2 core
Setting up coredump: asm.arch <-> x86 and asm.bits <-> 64
Setting up ...
2
votes
1answer
53 views
radare2 how to interpret ascii-art color bars?
I can't understand the meaning of ascii-art color bars.
what is the meaning of the # charaters?
[0x08000210]> iS=
00 0x08000000 |---------------------------------| 0x08000000 0 ---
01 ...
1
vote
1answer
112 views
Radare2 Disassembler How Do You Organize Visual Panels (V!)?
I would like to use Radare2 to learn about how C is assembled into assembly but I am having trouble with the layout. I think the V! mode would be very handy as you can watch the registers update as ...
1
vote
1answer
80 views
Function names syntax returned by radare2's afl?
Radare2's afl command returns function names with a specific syntax that I could not find documentation on:
For example:
radare2 -2 -A -q -c "aflj" C:/Windows/system32/advapi32.dll
0x77cce13c 22 ...
0
votes
1answer
110 views
Print string at address with radare2
I have created a very basic golang program which display a message with fmt.Println().
Here is what is see in radare2:
lea rcx, obj.main.statictmp_0 ; 0x4c84b0 ; "y[K"
mov qword [local_48h], rcx
lea ...
0
votes
2answers
58 views
How does this command modify the condition?
I'm new to radare2 here. Just started learning and I was trying out a challenge. What does the 3 columns in the radare2 visual mode represent?
May I know how the command below:
wa je 0x400976 @...
0
votes
1answer
67 views
rip adress not visible with dr command
I just finished this challenge. This is the content of main function :
[0x08048a86]> pdf
/ (fcn) main 417
| main (int argc, char **argv, char **envp);
| ; var int local_16h @ ebp-0x16
|...
2
votes
1answer
65 views
Debug point not hit with radare2
I am doing this reverse engenering challenge. I executed theses commands to analyse the main function :
radare2.exe ch15.exe
aaa
s main
pdf
This is the output of the pdf command :
[0x004017b8]> ...
2
votes
1answer
65 views
Why does -A (aaa) analysis show much more information, when using the -d (debug) CLI option in Radare2?
Why does -A (aaa) analysis show much more information, when using the -d (debug) CLI option in Radare2?
I'm using the newest version of Radare2 to analyze the Windows application.
As can be seen ...
1
vote
1answer
313 views
Impossible to execute a program with radare2 : TO DO continue
I am trying to crack a crackme. I already catch the flag because I seen the string variable which represants flag. I would like to catch the flag on an other way, I want to set a breakpoint when there ...
1
vote
1answer
163 views
Analyze all functions with radare2
I have a big library in which IDA found ~84300 functions but using aa in radare2 I was just able to found ~3000.
I tried setting anal.hasnext to true, anal.from and anal.to to the start and the end ...
2
votes
1answer
111 views
How to make Radare2 automatically disassemble next instruction after each `ds` debug single-step?
How to make Radare2 automatically disassemble next instruction after each ds debug single-step?
I thought that e asm.bytes=1 would achieve this, but that doesn't help.
In particular, GDB supports ...
1
vote
1answer
60 views
Radare2 doesn't update current address, when single-step debugging using `ds`?
Radare2 doesn't update current address, when single-step debugging using ds?
I'm debugging an ELF binary on Linux using single-step (ds). The problem is that the current address at the prompt doesn't ...
3
votes
1answer
74 views
How to get the memory-mapping (e.g. library) that contains a given address in Radare?
How to get the memory-mapping (e.g. library) that contains a given address in Radare?
I've done a search in Radare for a specific string (search.in = dbg.maps), which resulted in an address.
Now, I ...
0
votes
1answer
78 views
How to identify different memory regions of an elf binary in radare2?
I'm just starting out with reverse engineering, one thing I'm finding difficult is identifying different areas of memory. I'm using radare2, and I would like to be able to easily seek and identify ...
5
votes
2answers
887 views
Writing ELF headers in Radare?
Reading Keith Makan's, "Introduction to the ELF Format : The ELF Header", he modifies e_entry,
The e_entry field lists the offset in the file where the program should start executing.Normally it ...
1
vote
1answer
69 views
Make r2 -i <script> use python3 rather than python2
I have a r2 script that I'm running with r2 -i script.py test.x. By default this command uses python2. How can I get it to use python3? I couldn't find anything in the config.
1
vote
1answer
214 views
Radare's `aaaa` and -AA what does it do, exactly?
When I run aaa, Radare tells me,
[x] Use -AA or aaaa to perform additional experimental analysis.
But what does aaaa do? It's not documented under aa? nor aaa? nor
[0x000028e0]> aaa?
Usage: See ...
1
vote
1answer
81 views
Learning fine grained analysis in Radare with `a`?
The Radare community generally seems to look down upon simply running AAA or AAAA claiming that you need to instead learn the fine grained analysis and what they do. However, there seems to be no ...
3
votes
2answers
398 views
Writing a file with radare2 `w`?
Radare2 supports a w which writes a string.
w foobar write string 'foobar'
However, it doesn't seem to work for me,
$ touch foo
$ radare2 ./foo
w foobar
The file foo remains empty. Am ...
2
votes
0answers
211 views
How to save Radare2 Analysis?
How do I save a radare2 session after I did "aa"?
I know there is a command for saving a project, but this isn't working out for some reason (Ps PROJECTNAME). So I am looking for a way to save my ...
1
vote
0answers
79 views
Techniques for reversing (basic) hash function
Hi I'm relatively new to RE, and I'm using GDB and Radare2. As part of a crackme I'm trying to reverse a weak hash function that's a little too complicated for me to undo by hand. I've been trying to ...
0
votes
0answers
74 views
Does Radare offer the ability to invoke the linker and disassemble a function (import or reloc)?
Sometimes I'm doing static analysis outside of the debugger, and I want to see what a function that a symbol points to will do after the linker does runtime relocation. All I see in the disassembly is ...
0
votes
1answer
35 views
Does the Radare Debugger support STABS?
From the wiki on Stabs
stabs (sometimes written STABS) is a debugging data format for storing information about computer programs for use by symbolic and source-level debuggers.
Does Radare ...
1
vote
1answer
38 views
How do I read the “ascii-art bar of metadata in file boundaries”?
Radare2 has an option, p-,
Usage: p-[hj] [nblocks] bar|json|histogram blocks
| p- show ascii-art bar of metadata in file boundaries
| p-h show histogram analysis of metadata per block
| p-j ...
1
vote
2answers
56 views
Getting a high level overview of comparative size differences of binary files?
I have two binary files, one of them is pulled from Protostar's (stack0 example). The other one I compiled (from source) with the latest version of GCC. The size difference is massive. My version is ...
0
votes
1answer
99 views
Is there a way to get an instruction count with Radare2?
Let's say I want to find out how many instructions an arbitrary function foo decodes to, is there an easy way to do this?
I'm trying to check against a version I am compiling with a stored binary on ...
3
votes
3answers
186 views
Debugging a process running in a Virtual Machine with Radare2?
Is there anyway to debug a process running on a Virtual Machine (guest) with Radare2 from the host? I'm currently using VirtualBox. It provides a built in debugger. I'm not sure if it's possible for ...
