diff options
Diffstat (limited to 'drivers/md/dm-verity.h')
| -rw-r--r-- | drivers/md/dm-verity.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/md/dm-verity.h b/drivers/md/dm-verity.h new file mode 100644 index 0000000000..f9d522c870 --- /dev/null +++ b/drivers/md/dm-verity.h @@ -0,0 +1,135 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2012 Red Hat, Inc. + * Copyright (C) 2015 Google, Inc. + * + * Author: Mikulas Patocka <mpatocka@redhat.com> + * + * Based on Chromium dm-verity driver (C) 2011 The Chromium OS Authors + */ + +#ifndef DM_VERITY_H +#define DM_VERITY_H + +#include <linux/dm-bufio.h> +#include <linux/device-mapper.h> +#include <linux/interrupt.h> +#include <crypto/hash.h> + +#define DM_VERITY_MAX_LEVELS 63 + +enum verity_mode { + DM_VERITY_MODE_EIO, + DM_VERITY_MODE_LOGGING, + DM_VERITY_MODE_RESTART, + DM_VERITY_MODE_PANIC +}; + +enum verity_block_type { + DM_VERITY_BLOCK_TYPE_DATA, + DM_VERITY_BLOCK_TYPE_METADATA +}; + +struct dm_verity_fec; + +struct dm_verity { + struct dm_dev *data_dev; + struct dm_dev *hash_dev; + struct dm_target *ti; + struct dm_bufio_client *bufio; + char *alg_name; + struct crypto_ahash *tfm; + u8 *root_digest; /* digest of the root block */ + u8 *salt; /* salt: its size is salt_size */ + u8 *zero_digest; /* digest for a zero block */ + unsigned int salt_size; + sector_t data_start; /* data offset in 512-byte sectors */ + sector_t hash_start; /* hash start in blocks */ + sector_t data_blocks; /* the number of data blocks */ + sector_t hash_blocks; /* the number of hash blocks */ + unsigned char data_dev_block_bits; /* log2(data blocksize) */ + unsigned char hash_dev_block_bits; /* log2(hash blocksize) */ + unsigned char hash_per_block_bits; /* log2(hashes in hash block) */ + unsigned char levels; /* the number of tree levels */ + unsigned char version; + bool hash_failed:1; /* set if hash of any block failed */ + bool use_tasklet:1; /* try to verify in tasklet before work-queue */ + unsigned int digest_size; /* digest size for the current hash algorithm */ + unsigned int ahash_reqsize;/* the size of temporary space for crypto */ + enum verity_mode mode; /* mode for handling verification errors */ + unsigned int corrupted_errs;/* Number of errors for corrupted blocks */ + + struct workqueue_struct *verify_wq; + + /* starting blocks for each tree level. 0 is the lowest level. */ + sector_t hash_level_block[DM_VERITY_MAX_LEVELS]; + + struct dm_verity_fec *fec; /* forward error correction */ + unsigned long *validated_blocks; /* bitset blocks validated */ + + char *signature_key_desc; /* signature keyring reference */ +}; + +struct dm_verity_io { + struct dm_verity *v; + + /* original value of bio->bi_end_io */ + bio_end_io_t *orig_bi_end_io; + + sector_t block; + unsigned int n_blocks; + bool in_tasklet; + + struct bvec_iter iter; + + struct work_struct work; + struct tasklet_struct tasklet; + + /* + * Three variably-size fields follow this struct: + * + * u8 hash_req[v->ahash_reqsize]; + * u8 real_digest[v->digest_size]; + * u8 want_digest[v->digest_size]; + * + * To access them use: verity_io_hash_req(), verity_io_real_digest() + * and verity_io_want_digest(). + */ +}; + +static inline struct ahash_request *verity_io_hash_req(struct dm_verity *v, + struct dm_verity_io *io) +{ + return (struct ahash_request *)(io + 1); +} + +static inline u8 *verity_io_real_digest(struct dm_verity *v, + struct dm_verity_io *io) +{ + return (u8 *)(io + 1) + v->ahash_reqsize; +} + +static inline u8 *verity_io_want_digest(struct dm_verity *v, + struct dm_verity_io *io) +{ + return (u8 *)(io + 1) + v->ahash_reqsize + v->digest_size; +} + +extern int verity_for_bv_block(struct dm_verity *v, struct dm_verity_io *io, + struct bvec_iter *iter, + int (*process)(struct dm_verity *v, + struct dm_verity_io *io, + u8 *data, size_t len)); + +extern int verity_hash(struct dm_verity *v, struct ahash_request *req, + const u8 *data, size_t len, u8 *digest, bool may_sleep); + +extern int verity_hash_for_block(struct dm_verity *v, struct dm_verity_io *io, + sector_t block, u8 *digest, bool *is_zero); + +extern bool dm_is_verity_target(struct dm_target *ti); +extern int dm_verity_get_mode(struct dm_target *ti); +extern int dm_verity_get_root_digest(struct dm_target *ti, u8 **root_digest, + unsigned int *digest_size); + +#endif /* DM_VERITY_H */ |