Privacy for your command line options

A Linux tool to hide from "ps"

Example: Show only 'nmap', but without the command options:

./hidden nmap -sCV -F -Pn scanme.nmap.org
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
                     will not show

Example: Replace the current shell with a hidden tmux/shell. Hide all sub processes (-f), take on the name of some kernel process (-a) and hide all command line options:

exec ./hidden -f -a'[kworker/1:2-cgroup_destroy]' tmux

Does not require root
Works also on static binaries (e.g. GoLang binaries)
Hide the environment (/proc/<PID>/environ) as well
Does not rely on LD_PRELOAD= or libc.
Uses ptrace() to manipulate the Elf Auxiliary Table
Only 00.1% overhead.
Stops the admin from seeing or spying on your processes.
Starts a process under any process id (-n <pid>)

Compile:

git clone https://github.com/scriptzteam/Hidden.git
cd Hidden
make

How it works:

It uses ptrace() to manipulates the stack's Elf-Aux-Table.
Hidden intercepts when the Kernel passes the command-options to the program (during SYS_execve()): It moves the orignal command-options to a new memory location and then destroyes the old memory location. From the perspective of the Kernel (and procps), the command-options cease to exist. Finally, hidden fixes the pointers in the progam's Aux-Table and hands execution back to the program (PTRACE_CONTINUE). Thereafter, the program is tracked for any further calls to fork() or execve() [to do the same all over again].
Almost zero performance impact by using some neat ptrace-features: Tracing only execve() and fork() events (but not any other syscall).
The -n <pid> trick (to start a program under any pid) is a gimmick: Linux assigns a new pid to every new thread in sequential order, up until the largest possible pid of 4,194,304 (2^22). Thereafter, it starts again at pid 300 (or 1, depending on the environment). Hidden iterates over all 2^22 possible pids (within a few seconds) until the target pid-1 is encountered: Hidden forks 8+ processes, each calling clone((int (*)(void *))exit, ..). Directly jumping into exit() and setting CLONE_VM is the fastest way to iterate through all available PIDs.

License

scriptzteam/Hidden

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