Questions tagged [libc]

C standard library for the C programming language as specified in the C specification (ANSI C, C99, C11, ...).

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debugging an older version of libc

I'm trying to understand heap exploitation better. Therefore, I compiled the following file: https://github.com/shellphish/how2heap/blob/master/glibc_2.25/fastbin_dup_into_stack.c I have the newest ...
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Locating Exit/Abort Functions from Static Analysis

Similar to this question, I'm interested in locating exit and abort style functions in a firmware - any function call that in fact terminates the execution, by statically analyzing the firmware. My ...
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How can a segfault happen during the libc exit call on Linux?

I'm relatively new to reverse engineering, and I've decided to practise using the challenges from pwnable.tw. Currently, I am working on the "Silver Bullet" challenge. While testing, I have noticed ...
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system doesn't invoke /bin/sh

I am learning libc shellcode attacks and trying to execute /bin/sh from system I can execute other commands from system like whoami and ls -a but can not run /bin/sh the following works string = b&...
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exploiting a binary using ret2libc

I ran into this binary at a CTF : https://github.com/auehc/AUCTF-2020/tree/master/Pwn/House%20of%20Madness I first tried to exploit it and get a shell using ret2libc technique, however I didn't ...
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dlmalloc free pointers

I was looking at the implementation of "free" in my current dlmalloc(both the source and the disassembly). However, I could not find the code section the inserts the FD and BK into free chunks. What ...