The Linux Programming Interface by Kerrisk Michael
Author:Kerrisk, Michael [Michael Kerrisk]
Language: eng
Format: epub, mobi
Tags: COMPUTERS / Programming / Open Source
ISBN: 9781593272913
Publisher: No Starch Press
Published: 2011-02-10T16:00:00+00:00
Creating Capabilities-Only Environments
In the preceding pages, we have described various ways in which a process with the user ID 0 (root) is treated specially with respect to capabilities:
When a process with one or more user IDs that equal 0 sets all of its user IDs to nonzero values, its permitted and effective capability sets are cleared. (See Section 39.6.)
When a process with an effective user ID of 0 changes that user ID to a nonzero value, it loses its effective capabilities. When the reverse change is made, the permitted capability set is copied to the effective set. A similar procedure is followed for a subset of capabilities when the process’s file-system user ID is switched between 0 and nonzero values. (See Section 39.6.)
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