一次在linux上编译程序报错: *** buffer overflow detected ***: ./TAppEncoderStaticSADBS terminated 排查原因发现是sprintf读取时数组长度不够,将数组长度由50增加为128即可解决。
首先gdb 初步分析定位,定位到如下地址: #40x00007ffff6a4db81in __GI___fortify_fail (msg=msg@entry=0x7ffff6acf7e6"buffer overflow detected") at fortify_fail.c:44#50x00007ffff6a4b870in __GI___chk_fail () at chk_fail.c:28#60x00007ffff79c06fcin ?? () from ../lib/libylib...
inlined from ‘main’ at /home/t/develop/ctest/fortify_test.c:59:2: /usr/include/x86_64-linux-gnu/bits/string_fortified.h:90:10: warning: ‘__builtin___strcpy_chk’ writing 9 bytes into a region of size 5 overflows the destination [-Wstringop-overflow=] 90 | return __builtin__...
因为几乎没有任何合法的程序会在堆栈中存放代码,这种做法几乎不产生任何兼容性问题,除了在Linux中的两个特例,这时可执行的代码必须被放入堆栈中: (1)信号传递: Linux通过向进程堆栈释放代码然后引发中断来执行在堆栈中的代码来实现向进程发送Unix信号。非执行缓冲区的补丁在发送信号的时候是允许缓冲区可执行的。 (...
*** buffer overflow detected ***: ./http_load terminated === Backtrace: === /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f8b1248c08c] /lib/x86_64-linux-gnu/libc.so.6(+0x111020)[0x7f8b1248b020] /lib/x86_64-linux...
关闭linux内核内存地址随机化 sysctl –w kernel.randomize_va_space=0 关闭gcc编译器金丝雀 -fno-stack-protector 关闭堆栈段不可执行 -z execstack You may look up the Intel Manual to know why the shellcode works. #include <stdlib.h> #include <stdio.h> #include <string.h> char shellcode[]= ...
Buffer Overflow 前言 CS 161 is the voodoo plan of Lord Dirks. Project 1 is the first step. 这个project 1做的我心态爆炸 感觉自己还是不是很懂汇编指令 特别是esp寄存器 基本知识介绍 stackStructure.png 上图是linux x86系列的内存结构。stack向下生长,环境变量和Stack被视为相同的数据。
*** buffer overflow detected ***: ./WildChildrenServer terminated === Backtrace: === /lib/x86_64-linux-gnu/libc.so.6(+0x731ff)[0x7f08cb7a31ff] /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7f08cb8264c7] /lib/x86_64-linux-gnu/libc.so.6(+0xf46e0)[0x7f08cb8246...
*** buffer overflow detected ***: /home/czarx/prg/neovim/bin/nvim terminated === Backtrace: === /lib/x86_64-linux-gnu/libc.so.6(+0x73e0f)[0x2b32b3d6fe0f] /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x2b32b3e0771c] /lib/x86_64-linux-gnu/libc.so.6(+0x10...