Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-microblaze.git] / include / linux / bpf_lsm.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 /*
4  * Copyright (C) 2020 Google LLC.
5  */
6
7 #ifndef _LINUX_BPF_LSM_H
8 #define _LINUX_BPF_LSM_H
9
10 #include <linux/sched.h>
11 #include <linux/bpf.h>
12 #include <linux/lsm_hooks.h>
13
14 #ifdef CONFIG_BPF_LSM
15
16 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
17         RET bpf_lsm_##NAME(__VA_ARGS__);
18 #include <linux/lsm_hook_defs.h>
19 #undef LSM_HOOK
20
21 struct bpf_storage_blob {
22         struct bpf_local_storage __rcu *storage;
23 };
24
25 extern struct lsm_blob_sizes bpf_lsm_blob_sizes;
26
27 int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
28                         const struct bpf_prog *prog);
29
30 bool bpf_lsm_is_sleepable_hook(u32 btf_id);
31
32 static inline struct bpf_storage_blob *bpf_inode(
33         const struct inode *inode)
34 {
35         if (unlikely(!inode->i_security))
36                 return NULL;
37
38         return inode->i_security + bpf_lsm_blob_sizes.lbs_inode;
39 }
40
41 static inline struct bpf_storage_blob *bpf_task(
42         const struct task_struct *task)
43 {
44         if (unlikely(!task->security))
45                 return NULL;
46
47         return task->security + bpf_lsm_blob_sizes.lbs_task;
48 }
49
50 extern const struct bpf_func_proto bpf_inode_storage_get_proto;
51 extern const struct bpf_func_proto bpf_inode_storage_delete_proto;
52 extern const struct bpf_func_proto bpf_task_storage_get_proto;
53 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
54 void bpf_inode_storage_free(struct inode *inode);
55 void bpf_task_storage_free(struct task_struct *task);
56
57 #else /* !CONFIG_BPF_LSM */
58
59 static inline bool bpf_lsm_is_sleepable_hook(u32 btf_id)
60 {
61         return false;
62 }
63
64 static inline int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
65                                       const struct bpf_prog *prog)
66 {
67         return -EOPNOTSUPP;
68 }
69
70 static inline struct bpf_storage_blob *bpf_inode(
71         const struct inode *inode)
72 {
73         return NULL;
74 }
75
76 static inline struct bpf_storage_blob *bpf_task(
77         const struct task_struct *task)
78 {
79         return NULL;
80 }
81
82 static inline void bpf_inode_storage_free(struct inode *inode)
83 {
84 }
85
86 static inline void bpf_task_storage_free(struct task_struct *task)
87 {
88 }
89
90 #endif /* CONFIG_BPF_LSM */
91
92 #endif /* _LINUX_BPF_LSM_H */