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70 lines
2.1 KiB
70 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Landlock LSM - Filesystem management and hooks |
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* |
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* Copyright © 2017-2020 Mickaël Salaün <[email protected]> |
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* Copyright © 2018-2020 ANSSI |
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*/ |
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#ifndef _SECURITY_LANDLOCK_FS_H |
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#define _SECURITY_LANDLOCK_FS_H |
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#include <linux/fs.h> |
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#include <linux/init.h> |
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#include <linux/rcupdate.h> |
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#include "ruleset.h" |
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#include "setup.h" |
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/** |
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* struct landlock_inode_security - Inode security blob |
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* |
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* Enable to reference a &struct landlock_object tied to an inode (i.e. |
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* underlying object). |
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*/ |
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struct landlock_inode_security { |
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/** |
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* @object: Weak pointer to an allocated object. All assignments of a |
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* new object are protected by the underlying inode->i_lock. However, |
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* atomically disassociating @object from the inode is only protected |
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* by @object->lock, from the time @object's usage refcount drops to |
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* zero to the time this pointer is nulled out (cf. release_inode() and |
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* hook_sb_delete()). Indeed, such disassociation doesn't require |
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* inode->i_lock thanks to the careful rcu_access_pointer() check |
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* performed by get_inode_object(). |
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*/ |
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struct landlock_object __rcu *object; |
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}; |
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/** |
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* struct landlock_superblock_security - Superblock security blob |
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* |
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* Enable hook_sb_delete() to wait for concurrent calls to release_inode(). |
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*/ |
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struct landlock_superblock_security { |
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/** |
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* @inode_refs: Number of pending inodes (from this superblock) that |
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* are being released by release_inode(). |
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* Cf. struct super_block->s_fsnotify_inode_refs . |
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*/ |
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atomic_long_t inode_refs; |
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}; |
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static inline struct landlock_inode_security *landlock_inode( |
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const struct inode *const inode) |
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{ |
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return inode->i_security + landlock_blob_sizes.lbs_inode; |
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} |
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static inline struct landlock_superblock_security *landlock_superblock( |
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const struct super_block *const superblock) |
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{ |
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return superblock->s_security + landlock_blob_sizes.lbs_superblock; |
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} |
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__init void landlock_add_fs_hooks(void); |
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int landlock_append_fs_rule(struct landlock_ruleset *const ruleset, |
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const struct path *const path, u32 access_hierarchy); |
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#endif /* _SECURITY_LANDLOCK_FS_H */
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