124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
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/*
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* Copyright (C) 2015 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef DM_ANDROID_VERITY_H
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#define DM_ANDROID_VERITY_H
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#include <crypto/sha.h>
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#define RSANUMBYTES 256
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#define VERITY_METADATA_MAGIC_NUMBER 0xb001b001
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#define VERITY_METADATA_MAGIC_DISABLE 0x46464f56
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#define VERITY_METADATA_VERSION 0
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#define VERITY_STATE_DISABLE 1
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#define DATA_BLOCK_SIZE (4 * 1024)
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#define VERITY_METADATA_SIZE (8 * DATA_BLOCK_SIZE)
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#define VERITY_TABLE_ARGS 10
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#define VERITY_COMMANDLINE_PARAM_LENGTH 20
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#define BUILD_VARIANT 20
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/*
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* <subject>:<sha1-id> is the format for the identifier.
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* subject can either be the Common Name(CN) + Organization Name(O) or
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* just the CN if the it is prefixed with O
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* From https://tools.ietf.org/html/rfc5280#appendix-A
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* ub-organization-name-length INTEGER ::= 64
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* ub-common-name-length INTEGER ::= 64
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*
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* http://lxr.free-electrons.com/source/crypto/asymmetric_keys/x509_cert_parser.c?v=3.9#L278
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* ctx->o_size + 2 + ctx->cn_size + 1
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* + 41 characters for ":" and sha1 id
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* 64 + 2 + 64 + 1 + 1 + 40 (172)
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* setting VERITY_DEFAULT_KEY_ID_LENGTH to 200 characters.
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*/
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#define VERITY_DEFAULT_KEY_ID_LENGTH 200
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#define FEC_MAGIC 0xFECFECFE
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#define FEC_BLOCK_SIZE (4 * 1024)
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#define FEC_VERSION 0
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#define FEC_RSM 255
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#define FEC_ARG_LENGTH 300
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#define VERITY_TABLE_OPT_RESTART "restart_on_corruption"
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#define VERITY_TABLE_OPT_LOGGING "ignore_corruption"
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#define VERITY_TABLE_OPT_IGNZERO "ignore_zero_blocks"
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#define VERITY_TABLE_OPT_FEC_FORMAT \
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"use_fec_from_device %s fec_start %llu fec_blocks %llu fec_roots %u ignore_zero_blocks"
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#define VERITY_TABLE_OPT_FEC_ARGS 9
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#define VERITY_DEBUG 0
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#define DM_MSG_PREFIX "android-verity"
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#define DM_LINEAR_ARGS 2
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#define DM_LINEAR_TARGET_OFFSET "0"
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/*
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* There can be two formats.
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* if fec is present
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* <data_blocks> <verity_tree> <verity_metdata_32K><fec_data><fec_data_4K>
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* if fec is not present
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* <data_blocks> <verity_tree> <verity_metdata_32K>
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*/
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struct fec_header {
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__le32 magic;
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__le32 version;
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__le32 size;
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__le32 roots;
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__le32 fec_size;
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__le64 inp_size;
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u8 hash[SHA256_DIGEST_SIZE];
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} __attribute__((packed));
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struct android_metadata_header {
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__le32 magic_number;
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__le32 protocol_version;
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char signature[RSANUMBYTES];
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__le32 table_length;
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};
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struct android_metadata {
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struct android_metadata_header *header;
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char *verity_table;
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};
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struct fec_ecc_metadata {
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bool valid;
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u32 roots;
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u64 blocks;
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u64 rounds;
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u64 start;
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};
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struct bio_read {
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struct page **page_io;
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int number_of_pages;
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};
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extern struct target_type linear_target;
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extern void dm_linear_dtr(struct dm_target *ti);
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extern int dm_linear_map(struct dm_target *ti, struct bio *bio);
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extern void dm_linear_status(struct dm_target *ti, status_type_t type,
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unsigned status_flags, char *result, unsigned maxlen);
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extern int dm_linear_prepare_ioctl(struct dm_target *ti,
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struct block_device **bdev, fmode_t *mode);
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extern int dm_linear_iterate_devices(struct dm_target *ti,
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iterate_devices_callout_fn fn, void *data);
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extern int dm_linear_ctr(struct dm_target *ti, unsigned int argc, char **argv);
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extern long dm_linear_direct_access(struct dm_target *ti, sector_t sector,
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void **kaddr, pfn_t *pfn, long size);
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#endif /* DM_ANDROID_VERITY_H */
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