June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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POSIX file access permissions
Every process, which in the context of this discussion means every running program, belongs to a user and one or more groups. The user is represented by a 32-bit number called the user ID or UID. Information about users, including the mapping from a UID to a name, is kept in /etc/passwd. Likewise, groups are represented by a group ID or GID with information kept in /etc/group. There is always a root user with a UID of 0 and a root group with a GID of 0. The root user is also called the superuser because; in a default configuration, it bypasses most permission checks and can access all the resources in the system. Security in Linux-based systems is mainly about restricting access to the root account.
Each file ...
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