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    • Andreas Gruenbacher's avatar
      [PATCH] Generic infrastructure for acls · f0c8bd16
      Andreas Gruenbacher authored
      The patches solve the following problem: We want to grant access to devices
      based on who is logged in from where, etc.  This includes switching back and
      forth between multiple user sessions, etc.
      
      Using ACLs to define device access for logged-in users gives us all the
      flexibility we need in order to fully solve the problem.
      
      Device special files nowadays usually live on tmpfs, hence tmpfs ACLs.
      
      Different distros have come up with solutions that solve the problem to
      different degrees: SUSE uses a resource manager which tracks login sessions
      and sets ACLs on device inodes as appropriate.  RedHat uses pam_console, which
      changes the primary file ownership to the logged-in user.  Others use a set of
      groups that users must be in in order to be granted the appropriate accesses.
      
      The freedesktop.org project plans to implement a combination of a
      console-tracker and a HAL-device-list based solution to grant access to
      devices to users, and more distros will likely follow this approach.
      
      These patches have first been posted here on 2 February 2005, and again
      on 8 January 2006. We have been shipping them in SLES9 and SLES10 with
      no problems reported.  The previous submission is archived here:
      
         http://lkml.org/lkml/2006/1/8/229
         http://lkml.org/lkml/2006/1/8/230
         http://lkml.org/lkml/2006/1/8/231
      
      This patch:
      
      Add some infrastructure for access control lists on in-memory
      filesystems such as tmpfs.
      Signed-off-by: default avatarAndreas Gruenbacher <agruen@suse.de>
      Cc: Hugh Dickins <hugh@veritas.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      f0c8bd16