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隐写 | 奇怪的网站

http://www.sec4.fun/2018/05/01/%E9%9A%90%E5%86%99/#more

  之前对隐写比较感兴趣,研究过一些CTF中隐写的东西,但是这次xctf发现大概全忘了。实时证明,光靠脑子还是信不过的,学习嘛,还是得时不时做点总结的。结合这次的xctf,看大佬writeup加自己查的一些关于隐写的解题思路资料,收集到这儿,以后做题时参考一下。

修改系统内核绕过TracerPid检测反调试 | sec4fun

https://www.sec4.fun/2021/04/16/bypassptrace/#more

背景:最近投了腾讯的实习岗位,得到一个Android的CrackMe来考察逆向知识,分析后发现其关键函数位于native so库中,并且在函数开始时启动了线程进行TracerPid检测的反调试,当发现程序被调试时会直接杀死应用。虽然题目最后卡在了native 逆向与反调试绕过这里,下去后我学习了下如何绕过这个反调试。主要是两种:(1)patch so,直接修改关键值来绕过;(2)修改系统内核文件来

Study of SELinux-(1) SELinux简介 | 奇怪的网站

http://www.sec4.fun/2017/04/17/SELinux1/

  关于SELinux,最近为了信息安全老师的实验任务,去百度坑了好久,发现并没有太多关于学习SELinux的内容,大多只是告诉一下SELinux的开启/关闭问题。也许是因为SELinux这为了追求安全的白名单访问控制策略机制对一般用户或者说没有深入学习SELinux的用户来讲,太过于麻烦,因为一不留神,自己安装的某个应用、配置的某项服务就可能因为忘了修改策略导致文件被“安全”

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