Any command executed with sudo, as well as failed attempts, are logged to the authorization logs. How can I give a grace period to CTRL-ALT-DEL in systemd suggests that this is controlled by /lib/systemd/system/ctrl-alt-del.target, but on my system that is just a symlink to reboot.target, which seems to actually reboot, not just logout. Alexa, what is the meaning of life Alexa, what does the Earth weigh. Another set of logs that you might be interested in are the logs created by the sudo command. On Ubuntu 20.10 for example, which uses systemd as the init, everything is wired up so that Ctrl + Alt + Del by default offers to log you out on the GUI. * Disable the forced reboot, enable sending SIGINT to init. Which behavior is used can be selected with either:įor example, BusyBox' 1.28.3 init execs an arbitrary command given in /etc/inittab as: ::ctrlaltdel:/sbin/rebootĪnd here is a minimal interesting C example for uclibc: #define _XOPEN_SOURCE 700 That may seem like an unimportant distinction, but. Although sudo elevates you to root temporarily, su changes you to another user with suitable privileges. Basically using the program name 's' is just a way to show that it is doing that. Allowing the user to mess with the format string of a setUID binary is a very bad thing. The su command lets you change which user’s privileges sudo elevates you to. That isn't an exploit, what this shows is that when you pass s into sudo as the program name, it's being passed directly to printf. nova-rootwrap looks for filter definition. The film makes use of this topical connotation and twists it into a real demonstration with nightmarish magnitudes. lets the nova user run nova-rootwrap as root. In fact, make me a sandwich is a popular stereotypical catchphrase used on the internet to ridicule a woman with the underlying statement that women’s rightful place is in the kitchen, in servitude to men. The Linux kernel itself allows two possible behaviors from Ctrl+ Alt+ Del: The su in sudo is short for superuser and it is a standalone command. Instead of just calling sudo make me a sandwich, Nova calls sudo. Therefore, if the SIGINT behaviour is enabled, then you can make Ctrl + Alt + Del do whatever your init wants it to do. The Linux kernel can either hard reboot or send SIGINT the init process upon Ctrl + Alt + Del
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