1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs-verity module initialization and logging
4 *
5 * Copyright 2019 Google LLC
6 */
7
8 #include "fsverity_private.h"
9
10 #include <linux/ratelimit.h>
11
12 #ifdef CONFIG_SYSCTL
13 static struct ctl_table fsverity_sysctl_table[] = {
14 #ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
15 {
16 .procname = "require_signatures",
17 .data = &fsverity_require_signatures,
18 .maxlen = sizeof(int),
19 .mode = 0644,
20 .proc_handler = proc_dointvec_minmax,
21 .extra1 = SYSCTL_ZERO,
22 .extra2 = SYSCTL_ONE,
23 },
24 #endif
25 };
26
27 static void __init fsverity_init_sysctl(void)
28 {
29 register_sysctl_init("fs/verity", fsverity_sysctl_table);
30 }
31 #else /* CONFIG_SYSCTL */
32 static inline void fsverity_init_sysctl(void)
33 {
34 }
35 #endif /* !CONFIG_SYSCTL */
36
37 void fsverity_msg(const struct inode *inode, const char *level,
38 const char *fmt, ...)
39 {
40 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
41 DEFAULT_RATELIMIT_BURST);
42 struct va_format vaf;
43 va_list args;
44
45 if (!__ratelimit(&rs))
46 return;
47
48 va_start(args, fmt);
49 vaf.fmt = fmt;
50 vaf.va = &args;
51 if (inode)
52 printk("%sfs-verity (%s, inode %lu): %pV\n",
53 level, inode->i_sb->s_id, inode->i_ino, &vaf);
54 else
55 printk("%sfs-verity: %pV\n", level, &vaf);
56 va_end(args);
57 }
58
59 static int __init fsverity_init(void)
60 {
61 fsverity_check_hash_algs();
62 fsverity_init_info_cache();
63 fsverity_init_workqueue();
64 fsverity_init_sysctl();
65 fsverity_init_signature();
66 fsverity_init_bpf();
67 return 0;
68 }
69 late_initcall(fsverity_init)
70
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