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Hands-On System Programming with Linux
book

Hands-On System Programming with Linux

by Kaiwan N. Billimoria, Tigran Aivazian
October 2018
Beginner content levelBeginner
794 pages
19h 23m
English
Packt Publishing
Content preview from Hands-On System Programming with Linux

POSIX capabilities

So, going back to our fictional packcap example application, how do we run the process—which requires root, it seems—without root privileges (no root login, setuid-root, or sudo(8) allowed) and yet have it perform its tasks correctly?

Enter the POSIX Capabilities model: In this model, instead of giving a process blanket access as a root (or other) user, there is a way to embed particular capabilities into both the process and/or binary file. The Linux kernel supports the POSIX capabilities model from very early on—the 2.2 Linux kernels (at the time of writing, we are now in the 4.x kernel series). From a practical viewpoint, the features we describe as follows are available from Linux kernel version 2.6.24 (released January ...

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Publisher Resources

ISBN: 9781788998475Supplemental Content