fs/verity/init.c

   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)