Questions tagged [debuggers]
Debuggers allow the user to view and change the running state of a program.
186
questions
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29 views
Process close when try attach some debugger
I'm begin with reverse engineering, because I want to create some new functions to the "game server". That is, I want to inject(hook dll) in this game. **The source code of project not is ...
0
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1answer
30 views
Switch between debuggers while paused on a breakpoint
Is it possible to switch between debuggers and preserve where you are paused? Often times I find myself wanting to use a feature from a different debugger while paused in a specific context as each of ...
0
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1answer
23 views
GDB inserting breakpoint cause Segmentation Fault
I was trying to play around with gdb, and I'm especially interest in seeing how the Procedural Linkage Table(PLT) and the Global Offset Table (GOT) interact with each other. So I set some breakpoints ...
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0answers
49 views
x64dbg for linux executables?
Is there a x64dbg for Linux executables? I really love x64dbg, but in a lot of CTF challenges there are Linux executables and not .exe files or .dll files.
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2answers
34 views
Changing page permissions at runtime under a debugger
Does x64dbg or another debugger provide a way to change the page permissions for all mapped pages for a given section at runtime? Perhaps via a plugin?
0
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1answer
67 views
Program prevents x64dbg from starting or kills it if it's already running. What to do?
I have the following problem with x64dbg. I am trying to debug a x64 PE program with x64dbg on Windows.
It looks like the program has some sort of anti-debug protection. I have the following behavior:
...
0
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1answer
42 views
open decompiler view of current module (dll) in dynamic analysis
I have a program (P.exe) with several dependencies (A.dll, B.dll etc). I decompiled and studied B.dll, but at runtime, P.exe is using A.dll. The horizon is updating in ISA view-RIP, but I don't have ...
0
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1answer
47 views
Is it possible for a process to debug itself?
What happens if you try to debug yourself ? I mean, does the process crash ?
If it is possible, how would you implement it ?
I have tried launching x64dbg and I can't attach to my own x64dbg process.
...
0
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0answers
56 views
x64dbg show some text in Chinese
While debugging some 32-bit file with x32dbg, some of the text appear in Chinese and I don't why.
This happened after I moved to a new computer but both of them were Windows 10.
In my old computer I ...
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0answers
55 views
Unable to debug with Debuggers
I can't debug Screen Recorders on any debugger. I tried every possible way including anti debugging plugins, editing up the instructions but every time I failed. Mostly they land on pushad (which ...
0
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2answers
92 views
ASM Debuggers that visualize the stack (beginner friendly)
(Cross-posted from Stack Overflow)
Are there any debuggers that constantly show a visual of the stack and where everything is within it? For example, taking some random image:
I use gdb for most ...
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0answers
122 views
x64dbg execute till next call OR return
I am using x64dbg and I want to know if there's any way to run the code till next Call statement?
I know there is an "Execute till return" option,
but I want to execute till next call ...
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0answers
175 views
Recommended plugins for x64dbg
I was wondering, as professional reverse engineers - what would be your "must-have" plug ins? Please give a brief description and say how it helps you and possible drawbacks.
The more you can ...
1
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1answer
101 views
Is `movq rax, xmm0` buggy in Radare2?
Why doesn't rax get loaded from xmm0 here? radare2 bug?
GitHub issue `movq rax, xmm0` doesn't work in native debugger filed.
[0x0003b0e0]> drr
role reg value ref
―――――――――――――――――――...
0
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3answers
269 views
How To Identify Which Process Is Being Written To With WriteProcessMemory?
Basically, I cannot find which process is being written to when WriteProcessMemory is being called.
Currently I'm Setting Breakpoints on WriteProcessMemory and OpenProcess. However, the process handle ...
0
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1answer
341 views
Evan's debugger (edb) - Failed to open and attach to process: execv() failed: No such file or directory
Problem:
When I try to open an executable (in this case exploit exercises protostar stack0), then the following message appears in a pop-up box:
Failed to open and attach to process: execv() failed: ...
0
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0answers
212 views
Using IDA pro 7.2 and android server breakpoints problem
i have been trying to use IDA to make a breakpoints on a 4 byte memory address
to find out what arm op code writes to it . yet it fails to set a breakpoint and gives me this message " Xscale support ...
3
votes
0answers
42 views
IDA's debuggers disappeared
Using IDA 7
I've been debugging a program with remote GDB just fine. Today when I opened the database, most of the debuggers are missing from the list, including GDB. It's only when opening this ...
0
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0answers
45 views
Immunity Debuggger Inconsistent Results
Question for people using Immunity Debugger.
Just started using Immunity Debugger, using 1.85 on Win 7 Pro.
Doing some labs on vulnserver.exe and I am getting inconsistent results from Immunity ...
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0answers
666 views
In X64dbg, how can I script a string write to memory?
I find that I can write to memory as
[addr] = value
As given by the documentation at http://help.x64dbg.com/en/latest/introduction/Input.html
And while I could work around my problem as dividing ...
1
vote
2answers
649 views
Difference between 32 bit and 64 bit disassemblers
As far as my level of understanding goes, the only difference between a 32 bit and 64 bit disassembler is that the produced assembler-code of a 32 bit disassembler is only using 32 bit assembly ...
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0answers
151 views
Issues with Symbols when running windbg on windows xp sp3
I have been trying to debug a crash using windbg on windows xp sp3. I have been getting the below error while trying to debug. I googled around and found the Microsoft no longer offers symbols exe as ...
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0answers
543 views
Ida permission error
I tried debugging an running a program via ida64 and it says permission denied please reopen with elevated permission. I am on a mac please tell me how to fix this
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0answers
132 views
UTF8, UTF16 encoding string search
I want to search for a string written in Georgian from within x64dbg. It shows me spaces except them..
P.S I found this github repository but, I don't know how to install the plugin in the debugger.....
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0answers
53 views
How to find function called by instantaneous event (like mouse press for exemple)
I'm sorry if my question isn't very clear, I have trouble phrasing it so please bear with me.
I was playing around with Cheat Engine lately and found myself in a situation where I needed to find what ...
0
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1answer
559 views
Remote debugging using IDA, connecting to windbg server (kernel mode)
I do kernel debugging by using a virtual com port. One machine (host) is debugging the other machine. I have a remote machine that has IDA, and I wish to connect to the debugging session in the host ...
5
votes
1answer
2k views
How to do debug a running java process in linux?
TLDR I want to do live debugging of a java program on a linux machine, and don't how/what debugger to attach to the JVM to get this done.
I expect that this is a well-solved problem, but I lack the ...
0
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1answer
264 views
Advanced Anti-Debugging Techniques
I was wondering what are some advanced AntiDebugging techniques that more advanced than the basic ones like IsDebuggerPresent and CheckRemoteDebuggerPresent?
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0answers
140 views
OllyDbg - After restarting program, breakpoints lost
I am new to OllyDbg and I made a small (.NET Console App) program to test if I can crack the password. To set the break point where it writes Incorrect password. I need to run the program first. But ...
3
votes
0answers
140 views
How to redirect stdin in OllyDbg?
When I use IDA, I can use stdin from the file as in bash.
When I tried to do it in OllyDbg, it processed the parameters simply as a string.
Can I redirect stdin in OllyDbg?
-1
votes
1answer
68 views
Logging the Instruction Pointer Register
Is there a tool that logs the value the IP register of a specific process running?
I am trying to compare the instruction excution before and after a file modification.
2
votes
1answer
248 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?
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0answers
81 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
266 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?
...
-1
votes
1answer
2k views
How to find functions in IDA Pro/x64dbg
i created a program for testing, very simple in c++.
is ask for password if it is match is print correct, if no it is print "bad".
i try to find with ida where is the function of what i made.
but i ...
3
votes
0answers
203 views
Does pwntools provide any Radare2 integration?
I want to use pwntools with Radare2, since this is my debugger of choice.
However, I can only find GDB-related library calls in pwntools' documentation (pwnlib.gdb).
Anyone with experience in ...
1
vote
0answers
70 views
IDA Pro - Remote debugging suse enterpris server 10 (glibc2_10 required)
I have a Suse enterprise server 10 on VMWare. I want to remote debug an application in this VM using IDA pro, I already tried these:
Copied linux_server form IDApro into this VM and tried to run it, ...
2
votes
1answer
343 views
how watchpoint on register works
GDB has an option to set watchpoint on register*, how does it work ? what happens during context switching ? why the only implementation is for mips ?
Is there a way to make it work for lldb also ?
*...
2
votes
1answer
718 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 ...
0
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2answers
806 views
Tricore debugging tools
I am new in the reverse engineering, I have a good experience in programming MCUs like c51 and ARM.
Now I would like to learn about Tricore reverse engineering... ECUs mainly.
I can obtain the ECU ...
1
vote
2answers
606 views
Generate software breakpoint other than int3
Is it possible to generate a software breakpoint other than int3 to be catched by the debugger, like a division by zero for example?
If so, I was wondering why debuggers don't support generating ...
1
vote
1answer
302 views
Is there any debugger that supports step-back? [duplicate]
In Ida when I use debugger, but I can't step back.
Is there any debugger that allow go backwards?
14
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4answers
16k views
OllyDbg vs x64dbg - Does OllyDbg have any particular advantage over x64dbg?
OllyDbg had been nice in the past, but as it was frozen, x32dbg/x64dbg era came.
However, some people still use OllyDbg. Are there any reasons to use the old OllyDbg still? Doesn't x32dbg/64dbg covers ...
0
votes
1answer
88 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
2k views
x64dbg how to watch all changes after one step
We know that x64dbg will mark the changes as red color after we step an assembly instruction, so how can I get all changes without scroll monitor windows?
x64dbg 32bit version trace:
NEW UPDATE
...
0
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1answer
318 views
GDB MI output vs. stdout
I am using GDBs machine interface (mi) to write some simple tracers/loggers.
Now I ran into the problem of telling apart GDB output from text the target-program itself wrote to stdout.
If I look ...
3
votes
2answers
12k views
Find base address and memory size of program debugged in gdb
I want to find out the base address and the imagesize of the program being debugged in gdb. As in, where it got loaded in memory. For shared libraries I can do "info sharedlibrary" and I get very ...
3
votes
1answer
313 views
Disassembly - Why the CMP instruction is multiplying by 2 the value being compared
I'll get right to the point, I have a crack me program, that is a program with a password inside that needs to be found so that you can complete the challenge.
I easily found the cmp instruction ...
2
votes
1answer
752 views
On ollydbg how do I find a string in code that I find on memory map?
The license is saved in a txt and I can't find the string. The code is protected as it calls to encodepointer and some modules are hidden. I'm using ollydbg 2.01 with olly ext1.8 every option ...
0
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2answers
342 views
Automating a crackme solving process
Let's say we have a simple crackme, which asks for a password. After verifying it, eax will contain 1 if it is correct, and 0 otherwise. Is there a way (I am interested both in Linux and Windows) for ...
