f0c8bd164e
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: Andreas Gruenbacher <agruen@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
37 lines
1002 B
C
37 lines
1002 B
C
/*
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* fs/generic_acl.c
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*
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* (C) 2005 Andreas Gruenbacher <agruen@suse.de>
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*
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* This file is released under the GPL.
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*/
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#ifndef GENERIC_ACL_H
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#define GENERIC_ACL_H
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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.h>
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/**
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* struct generic_acl_operations - filesystem operations
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*
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* Filesystems must make these operations available to the generic
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* operations.
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*/
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struct generic_acl_operations {
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struct posix_acl *(*getacl)(struct inode *, int);
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void (*setacl)(struct inode *, int, struct posix_acl *);
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};
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size_t generic_acl_list(struct inode *, struct generic_acl_operations *, int,
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char *, size_t);
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int generic_acl_get(struct inode *, struct generic_acl_operations *, int,
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void *, size_t);
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int generic_acl_set(struct inode *, struct generic_acl_operations *, int,
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const void *, size_t);
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int generic_acl_init(struct inode *, struct inode *,
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struct generic_acl_operations *);
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int generic_acl_chmod(struct inode *, struct generic_acl_operations *);
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#endif
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