December 2012
Intermediate to advanced
888 pages
48h 24m
English
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Understanding Set User ID and Set Group ID Permissions
Two more types of permission are “set user ID,” known as suid, and “set group ID,” or sgid. These settings, when used in a program, enable any user running that program to have program owner or group owner permissions for that program. These settings enable the program to be run effectively by anyone, without requiring that each user’s permissions be altered to include specific permissions for that program.
One commonly used program with suid permissions is the passwd command:
matthew@seymour:~$ ls -l /usr/bin/passwd-rwsr-xr-x 1 root root 42856 2010-01-26 10:09 /usr/bin/passwd
This setting allows normal users to execute the command (as root) to make changes to a root-only-accessible file ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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