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432434c9f8
To meet some users' needs, add optional support for having fs-verity handle a portion of the authentication policy in the kernel. An ".fs-verity" keyring is created to which X.509 certificates can be added; then a sysctl 'fs.verity.require_signatures' can be set to cause the kernel to enforce that all fs-verity files contain a signature of their file measurement by a key in this keyring. See the "Built-in signature verification" section of Documentation/filesystems/fsverity.rst for the full documentation. Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Eric Biggers <ebiggers@google.com>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/verity/init.c: fs-verity module initialization and logging
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*
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* Copyright 2019 Google LLC
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*/
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#include "fsverity_private.h"
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#include <linux/ratelimit.h>
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void fsverity_msg(const struct inode *inode, const char *level,
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const char *fmt, ...)
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{
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static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
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DEFAULT_RATELIMIT_BURST);
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struct va_format vaf;
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va_list args;
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if (!__ratelimit(&rs))
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return;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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if (inode)
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printk("%sfs-verity (%s, inode %lu): %pV\n",
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level, inode->i_sb->s_id, inode->i_ino, &vaf);
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else
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printk("%sfs-verity: %pV\n", level, &vaf);
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va_end(args);
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}
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static int __init fsverity_init(void)
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{
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int err;
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fsverity_check_hash_algs();
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err = fsverity_init_info_cache();
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if (err)
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return err;
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err = fsverity_init_workqueue();
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if (err)
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goto err_exit_info_cache;
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err = fsverity_init_signature();
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if (err)
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goto err_exit_workqueue;
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pr_debug("Initialized fs-verity\n");
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return 0;
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err_exit_workqueue:
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fsverity_exit_workqueue();
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err_exit_info_cache:
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fsverity_exit_info_cache();
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return err;
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}
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late_initcall(fsverity_init)
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