February 2020
Intermediate to advanced
666 pages
15h 45m
English
Content preview from Mastering Linux Security and Hardening - Second Edition
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Looking at user-mode processes
If you use the ls command within /proc, you'll see a whole bunch of directories that have numbers as their names. Here's a partial listing from my CentOS VM:
[donnie@localhost proc]$ ls -ltotal 0dr-xr-xr-x. 9 root root 0 Oct 19 14:23 1dr-xr-xr-x. 9 root root 0 Oct 19 14:23 10dr-xr-xr-x. 9 root root 0 Oct 19 14:23 11dr-xr-xr-x. 9 root root 0 Oct 19 14:23 12dr-xr-xr-x. 9 root root 0 Oct 19 14:23 13dr-xr-xr-x. 9 root root 0 Oct 19 14:24 1373dr-xr-xr-x. 9 root root 0 Oct 19 14:24 145dr-xr-xr-x. 9 root root 0 Oct 19 14:23 15dr-xr-xr-x. 9 root root 0 Oct 19 14:23 16dr-xr-xr-x. 9 root root 0 Oct 19 14:23 17. . .. . .
Each of these numbered directories corresponds to the Process ID (PID) number of a user-mode process. ...