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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Landlock LSM - Filesystem management and hooks
- *
- * Copyright © 2017-2020 Mickaël Salaün <[email protected]>
- * 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,
- access_mask_t access_hierarchy);
- #endif /* _SECURITY_LANDLOCK_FS_H */
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