path: root/mm/shmem_acl.c
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authorAndreas Gruenbacher <>2006-09-29 02:01:34 -0700
committerLinus Torvalds <>2006-09-29 09:18:24 -0700
commitf0c8bd164e1a0585d7e46896553136b4f488bd19 (patch)
tree75cbeec5113da7c20c6ee9ef09bdaea82014738a /mm/shmem_acl.c
parent4e6fd33b75602ced4c5d43e99a10a1d13f33d4f4 (diff)
[PATCH] Generic infrastructure for acls
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 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: This patch: Add some infrastructure for access control lists on in-memory filesystems such as tmpfs. Signed-off-by: Andreas Gruenbacher <> Cc: Hugh Dickins <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
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