06-23-2010
There are some security issues that can also arise if a user is intimately familiar with how parameters are pushed on to the stack. Buffer overflow attacks, stack smashing, and heap smashing are all common ways to attack vulnerable code. Additionally, format string issues might allow a user to view what is on the stack. Imagine if you wrote a C program that takes user input and prints back what the user typed. Now imagine what would happen if the user typed "%x%x%x%x%x%x..." it would essentially print whats on the stack in hex format.
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LEARN ABOUT POSIX
systemd-tty-ask-password-agent
SYSTEMD-TTY-ASK-PASSWORD-AGENT(1) systemd-tty-ask-password-agent SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)
NAME
systemd-tty-ask-password-agent - List or process pending systemd password requests
SYNOPSIS
systemd-tty-ask-password-agent [OPTIONS...] [VARIABLE=VALUE...]
DESCRIPTION
systemd-tty-ask-password-agent is a password agent that handles password requests of the system, for example for hard disk encryption
passwords or SSL certificate passwords that need to be queried at boot-time or during runtime.
systemd-tty-ask-password-agent implements the Password Agents Specification[1], and is one of many possible response agents which answer to
queries formulated with systemd-ask-password(1).
OPTIONS
The following options are understood:
--list
Lists all currently pending system password requests.
--query
Process all currently pending system password requests by querying the user on the calling TTY.
--watch
Continuously process password requests.
--wall
Forward password requests to wall(1) instead of querying the user on the calling TTY.
--plymouth
Ask question with plymouth(8) instead of querying the user on the calling TTY.
--console
Ask question on /dev/console instead of querying the user on the calling TTY.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
SEE ALSO
systemd(1), systemctl(1), systemd-ask-password-console.service(8), wall(1), plymouth(8)
NOTES
1. Password Agents Specification
https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents
systemd 237 SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)