blob: 187284b421c9d88c13e454930f48ec7023db630e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Landlock LSM - Filesystem management and hooks
*
* Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
* Copyright © 2018-2020 ANSSI
*/
#ifndef _SECURITY_LANDLOCK_FS_H
#define _SECURITY_LANDLOCK_FS_H
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/rcupdate.h>
#include "ruleset.h"
#include "setup.h"
/**
* struct landlock_inode_security - Inode security blob
*
* Enable to reference a &struct landlock_object tied to an inode (i.e.
* underlying object).
*/
struct landlock_inode_security {
/**
* @object: Weak pointer to an allocated object. All assignments of a
* new object are protected by the underlying inode->i_lock. However,
* atomically disassociating @object from the inode is only protected
* by @object->lock, from the time @object's usage refcount drops to
* zero to the time this pointer is nulled out (cf. release_inode() and
* hook_sb_delete()). Indeed, such disassociation doesn't require
* inode->i_lock thanks to the careful rcu_access_pointer() check
* performed by get_inode_object().
*/
struct landlock_object __rcu *object;
};
/**
* struct landlock_superblock_security - Superblock security blob
*
* Enable hook_sb_delete() to wait for concurrent calls to release_inode().
*/
struct landlock_superblock_security {
/**
* @inode_refs: Number of pending inodes (from this superblock) that
* are being released by release_inode().
* Cf. struct super_block->s_fsnotify_inode_refs .
*/
atomic_long_t inode_refs;
};
static inline struct landlock_inode_security *landlock_inode(
const struct inode *const inode)
{
return inode->i_security + landlock_blob_sizes.lbs_inode;
}
static inline struct landlock_superblock_security *landlock_superblock(
const struct super_block *const superblock)
{
return superblock->s_security + landlock_blob_sizes.lbs_superblock;
}
__init void landlock_add_fs_hooks(void);
int landlock_append_fs_rule(struct landlock_ruleset *const ruleset,
const struct path *const path, u32 access_hierarchy);
#endif /* _SECURITY_LANDLOCK_FS_H */
|
