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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * evm.h
4 *
5 * Copyright (c) 2009 IBM Corporation
6 * Author: Mimi Zohar <zohar@us.ibm.com>
7 */
8
9#ifndef _LINUX_EVM_H
10#define _LINUX_EVM_H
11
12#include <linux/integrity.h>
13#include <linux/xattr.h>
14
15struct integrity_iint_cache;
16
17#ifdef CONFIG_EVM
18extern int evm_set_key(void *key, size_t keylen);
19extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
20 const char *xattr_name,
21 void *xattr_value,
22 size_t xattr_value_len,
23 struct integrity_iint_cache *iint);
24extern int evm_inode_setattr(struct user_namespace *mnt_userns,
25 struct dentry *dentry, struct iattr *attr);
26extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
27extern int evm_inode_setxattr(struct user_namespace *mnt_userns,
28 struct dentry *dentry, const char *name,
29 const void *value, size_t size);
30extern void evm_inode_post_setxattr(struct dentry *dentry,
31 const char *xattr_name,
32 const void *xattr_value,
33 size_t xattr_value_len);
34extern int evm_inode_removexattr(struct user_namespace *mnt_userns,
35 struct dentry *dentry, const char *xattr_name);
36extern void evm_inode_post_removexattr(struct dentry *dentry,
37 const char *xattr_name);
38extern int evm_inode_init_security(struct inode *inode,
39 const struct xattr *xattr_array,
40 struct xattr *evm);
41extern bool evm_revalidate_status(const char *xattr_name);
42extern int evm_protected_xattr_if_enabled(const char *req_xattr_name);
43extern int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
44 int buffer_size, char type,
45 bool canonical_fmt);
46#ifdef CONFIG_FS_POSIX_ACL
47extern int posix_xattr_acl(const char *xattrname);
48#else
49static inline int posix_xattr_acl(const char *xattrname)
50{
51 return 0;
52}
53#endif
54#else
55
56static inline int evm_set_key(void *key, size_t keylen)
57{
58 return -EOPNOTSUPP;
59}
60
61#ifdef CONFIG_INTEGRITY
62static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
63 const char *xattr_name,
64 void *xattr_value,
65 size_t xattr_value_len,
66 struct integrity_iint_cache *iint)
67{
68 return INTEGRITY_UNKNOWN;
69}
70#endif
71
72static inline int evm_inode_setattr(struct user_namespace *mnt_userns,
73 struct dentry *dentry, struct iattr *attr)
74{
75 return 0;
76}
77
78static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
79{
80 return;
81}
82
83static inline int evm_inode_setxattr(struct user_namespace *mnt_userns,
84 struct dentry *dentry, const char *name,
85 const void *value, size_t size)
86{
87 return 0;
88}
89
90static inline void evm_inode_post_setxattr(struct dentry *dentry,
91 const char *xattr_name,
92 const void *xattr_value,
93 size_t xattr_value_len)
94{
95 return;
96}
97
98static inline int evm_inode_removexattr(struct user_namespace *mnt_userns,
99 struct dentry *dentry,
100 const char *xattr_name)
101{
102 return 0;
103}
104
105static inline void evm_inode_post_removexattr(struct dentry *dentry,
106 const char *xattr_name)
107{
108 return;
109}
110
111static inline int evm_inode_init_security(struct inode *inode,
112 const struct xattr *xattr_array,
113 struct xattr *evm)
114{
115 return 0;
116}
117
118static inline bool evm_revalidate_status(const char *xattr_name)
119{
120 return false;
121}
122
123static inline int evm_protected_xattr_if_enabled(const char *req_xattr_name)
124{
125 return false;
126}
127
128static inline int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
129 int buffer_size, char type,
130 bool canonical_fmt)
131{
132 return -EOPNOTSUPP;
133}
134
135#endif /* CONFIG_EVM */
136#endif /* LINUX_EVM_H */