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A Linux Implementation of Windows ACLs


William Mahoney, James Harr


Vol. 10  No. 7  pp. 1-7


The file protection methods used within the Linux operating system are based on the traditional flags associated with old-style UNIX systems. The Access Control List (ACL) permissions utilized in more recent additions of Linux are constructed on top of these original permissions, and the result is a confusing blend of the old style and new style file protection mechanisms. When permission settings are confusing to the user, incorrect permission settings are more likely; this leads to vulnerabilities in systems which can then be taken advantage of by adversaries. The various Windows operating systems use a more simplistic ACL method for file permission checks, and the authors describe an implementation of these permissions into the Linux file system.


Linux, Access Control Lists, File Security