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
fsverity_init_sysctl(void)28 static void __init fsverity_init_sysctl(void)
29 {
30 register_sysctl_init("fs/verity", fsverity_sysctl_table);
31 }
32 #else /* CONFIG_SYSCTL */
fsverity_init_sysctl(void)33 static inline void fsverity_init_sysctl(void)
34 {
35 }
36 #endif /* !CONFIG_SYSCTL */
37
fsverity_msg(const struct inode * inode,const char * level,const char * fmt,...)38 void fsverity_msg(const struct inode *inode, const char *level,
39 const char *fmt, ...)
40 {
41 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
42 DEFAULT_RATELIMIT_BURST);
43 struct va_format vaf;
44 va_list args;
45
46 if (!__ratelimit(&rs))
47 return;
48
49 va_start(args, fmt);
50 vaf.fmt = fmt;
51 vaf.va = &args;
52 if (inode)
53 printk("%sfs-verity (%s, inode %lu): %pV\n",
54 level, inode->i_sb->s_id, inode->i_ino, &vaf);
55 else
56 printk("%sfs-verity: %pV\n", level, &vaf);
57 va_end(args);
58 }
59
fsverity_init(void)60 static int __init fsverity_init(void)
61 {
62 fsverity_check_hash_algs();
63 fsverity_init_info_cache();
64 fsverity_init_workqueue();
65 fsverity_init_sysctl();
66 fsverity_init_signature();
67 return 0;
68 }
69 late_initcall(fsverity_init)
70