^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2012 Red Hat, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Mikulas Patocka <mpatocka@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on Chromium dm-verity driver (C) 2011 The Chromium OS Authors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * In the file "/sys/module/dm_verity/parameters/prefetch_cluster" you can set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * default prefetch value. Data are read in "prefetch_cluster" chunks from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * hash device. Setting this greatly improves performance when data and hash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * are on the same disk on different partitions on devices with poor random
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * access behavior.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "dm-verity.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "dm-verity-fec.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "dm-verity-verify-sig.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define DM_MSG_PREFIX "verity"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define DM_VERITY_ENV_LENGTH 42
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define DM_VERITY_ENV_VAR_NAME "DM_VERITY_ERR_BLOCK_NR"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define DM_VERITY_DEFAULT_PREFETCH_SIZE 262144
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define DM_VERITY_MAX_CORRUPTED_ERRS 100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define DM_VERITY_OPT_LOGGING "ignore_corruption"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DM_VERITY_OPT_RESTART "restart_on_corruption"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define DM_VERITY_OPT_PANIC "panic_on_corruption"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define DM_VERITY_OPT_IGN_ZEROES "ignore_zero_blocks"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define DM_VERITY_OPT_AT_MOST_ONCE "check_at_most_once"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define DM_VERITY_OPTS_MAX (3 + DM_VERITY_OPTS_FEC + \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) DM_VERITY_ROOT_HASH_VERIFICATION_OPTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static unsigned dm_verity_prefetch_cluster = DM_VERITY_DEFAULT_PREFETCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) module_param_named(prefetch_cluster, dm_verity_prefetch_cluster, uint, S_IRUGO | S_IWUSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct dm_verity_prefetch_work {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct work_struct work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct dm_verity *v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) sector_t block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned n_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * Auxiliary structure appended to each dm-bufio buffer. If the value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * hash_verified is nonzero, hash of the block has been verified.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * The variable hash_verified is set to 0 when allocating the buffer, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * it can be changed to 1 and it is never reset to 0 again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * There is no lock around this value, a race condition can at worst cause
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * that multiple processes verify the hash of the same buffer simultaneously
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * and write 1 to hash_verified simultaneously.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * This condition is harmless, so we don't need locking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct buffer_aux {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int hash_verified;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * Initialize struct buffer_aux for a freshly created buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static void dm_bufio_alloc_callback(struct dm_buffer *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct buffer_aux *aux = dm_bufio_get_aux_data(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) aux->hash_verified = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * Translate input sector number to the sector number on the target device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static sector_t verity_map_sector(struct dm_verity *v, sector_t bi_sector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return v->data_start + dm_target_offset(v->ti, bi_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * Return hash position of a specified block at a specified tree level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * (0 is the lowest level).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * The lowest "hash_per_block_bits"-bits of the result denote hash position
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * inside a hash block. The remaining bits denote location of the hash block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static sector_t verity_position_at_level(struct dm_verity *v, sector_t block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return block >> (level * v->hash_per_block_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static int verity_hash_update(struct dm_verity *v, struct ahash_request *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) const u8 *data, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct crypto_wait *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct scatterlist sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (likely(!is_vmalloc_addr(data))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) sg_init_one(&sg, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ahash_request_set_crypt(req, &sg, NULL, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return crypto_wait_req(crypto_ahash_update(req), wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) size_t this_step = min_t(size_t, len, PAGE_SIZE - offset_in_page(data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) flush_kernel_vmap_range((void *)data, this_step);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) sg_init_table(&sg, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) sg_set_page(&sg, vmalloc_to_page(data), this_step, offset_in_page(data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) ahash_request_set_crypt(req, &sg, NULL, this_step);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) r = crypto_wait_req(crypto_ahash_update(req), wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (unlikely(r))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) data += this_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) len -= this_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) } while (len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * Wrapper for crypto_ahash_init, which handles verity salting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int verity_hash_init(struct dm_verity *v, struct ahash_request *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct crypto_wait *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ahash_request_set_tfm(req, v->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) CRYPTO_TFM_REQ_MAY_BACKLOG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) crypto_req_done, (void *)wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) crypto_init_wait(wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) r = crypto_wait_req(crypto_ahash_init(req), wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (unlikely(r < 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) DMERR("crypto_ahash_init failed: %d", r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (likely(v->salt_size && (v->version >= 1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) r = verity_hash_update(v, req, v->salt, v->salt_size, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int verity_hash_final(struct dm_verity *v, struct ahash_request *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) u8 *digest, struct crypto_wait *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (unlikely(v->salt_size && (!v->version))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) r = verity_hash_update(v, req, v->salt, v->salt_size, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (r < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) DMERR("verity_hash_final failed updating salt: %d", r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) ahash_request_set_crypt(req, NULL, digest, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) r = crypto_wait_req(crypto_ahash_final(req), wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int verity_hash(struct dm_verity *v, struct ahash_request *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) const u8 *data, size_t len, u8 *digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct crypto_wait wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) r = verity_hash_init(v, req, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) r = verity_hash_update(v, req, data, len, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) r = verity_hash_final(v, req, digest, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static void verity_hash_at_level(struct dm_verity *v, sector_t block, int level,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) sector_t *hash_block, unsigned *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) sector_t position = verity_position_at_level(v, block, level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) *hash_block = v->hash_level_block[level] + (position >> v->hash_per_block_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (!offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) idx = position & ((1 << v->hash_per_block_bits) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (!v->version)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) *offset = idx * v->digest_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) *offset = idx << (v->hash_dev_block_bits - v->hash_per_block_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * Handle verification errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int verity_handle_err(struct dm_verity *v, enum verity_block_type type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) unsigned long long block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) char verity_env[DM_VERITY_ENV_LENGTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) char *envp[] = { verity_env, NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) const char *type_str = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct mapped_device *md = dm_table_get_md(v->ti->table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* Corruption should be visible in device status in all modes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) v->hash_failed = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (v->corrupted_errs >= DM_VERITY_MAX_CORRUPTED_ERRS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) v->corrupted_errs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) case DM_VERITY_BLOCK_TYPE_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) type_str = "data";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) case DM_VERITY_BLOCK_TYPE_METADATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) type_str = "metadata";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) DMERR_LIMIT("%s: %s block %llu is corrupted", v->data_dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) type_str, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (v->corrupted_errs == DM_VERITY_MAX_CORRUPTED_ERRS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) DMERR("%s: reached maximum errors", v->data_dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) snprintf(verity_env, DM_VERITY_ENV_LENGTH, "%s=%d,%llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) DM_VERITY_ENV_VAR_NAME, type, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) kobject_uevent_env(&disk_to_dev(dm_disk(md))->kobj, KOBJ_CHANGE, envp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (v->mode == DM_VERITY_MODE_LOGGING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (v->mode == DM_VERITY_MODE_RESTART)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) kernel_restart("dm-verity device corrupted");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (v->mode == DM_VERITY_MODE_PANIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) panic("dm-verity device corrupted");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * Verify hash of a metadata block pertaining to the specified data block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * ("block" argument) at a specified level ("level" argument).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * On successful return, verity_io_want_digest(v, io) contains the hash value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * for a lower tree level or for the data block (if we're at the lowest level).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * If "skip_unverified" is true, unverified buffer is skipped and 1 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * If "skip_unverified" is false, unverified buffer is hashed and verified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * against current value of verity_io_want_digest(v, io).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static int verity_verify_level(struct dm_verity *v, struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) sector_t block, int level, bool skip_unverified,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) u8 *want_digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct dm_buffer *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) struct buffer_aux *aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) u8 *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) sector_t hash_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) unsigned offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) verity_hash_at_level(v, block, level, &hash_block, &offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) data = dm_bufio_read(v->bufio, hash_block, &buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (IS_ERR(data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return PTR_ERR(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) aux = dm_bufio_get_aux_data(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (!aux->hash_verified) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (skip_unverified) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) r = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) goto release_ret_r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) r = verity_hash(v, verity_io_hash_req(v, io),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) data, 1 << v->hash_dev_block_bits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) verity_io_real_digest(v, io));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) goto release_ret_r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (likely(memcmp(verity_io_real_digest(v, io), want_digest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) v->digest_size) == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) aux->hash_verified = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) else if (verity_fec_decode(v, io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) DM_VERITY_BLOCK_TYPE_METADATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) hash_block, data, NULL) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) aux->hash_verified = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) else if (verity_handle_err(v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) DM_VERITY_BLOCK_TYPE_METADATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) hash_block)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) r = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) goto release_ret_r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) data += offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) memcpy(want_digest, data, v->digest_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) r = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) release_ret_r:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) dm_bufio_release(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * Find a hash for a given block, write it to digest and verify the integrity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * of the hash tree if necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) int verity_hash_for_block(struct dm_verity *v, struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) sector_t block, u8 *digest, bool *is_zero)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int r = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (likely(v->levels)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * First, we try to get the requested hash for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * the current block. If the hash block itself is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * verified, zero is returned. If it isn't, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * function returns 1 and we fall back to whole
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * chain verification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) r = verity_verify_level(v, io, block, 0, true, digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (likely(r <= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) memcpy(digest, v->root_digest, v->digest_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) for (i = v->levels - 1; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) r = verity_verify_level(v, io, block, i, false, digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (unlikely(r))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (!r && v->zero_digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) *is_zero = !memcmp(v->zero_digest, digest, v->digest_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) *is_zero = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * Calculates the digest for the given bio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) static int verity_for_io_block(struct dm_verity *v, struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct bvec_iter *iter, struct crypto_wait *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) unsigned int todo = 1 << v->data_dev_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) struct scatterlist sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) struct ahash_request *req = verity_io_hash_req(v, io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) struct bio_vec bv = bio_iter_iovec(bio, *iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) sg_init_table(&sg, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) len = bv.bv_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (likely(len >= todo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) len = todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * Operating on a single page at a time looks suboptimal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) * until you consider the typical block size is 4,096B.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * Going through this loops twice should be very rare.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) sg_set_page(&sg, bv.bv_page, len, bv.bv_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) ahash_request_set_crypt(req, &sg, NULL, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) r = crypto_wait_req(crypto_ahash_update(req), wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (unlikely(r < 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) DMERR("verity_for_io_block crypto op failed: %d", r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) bio_advance_iter(bio, iter, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) todo -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) } while (todo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * Calls function process for 1 << v->data_dev_block_bits bytes in the bio_vec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * starting from iter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) int verity_for_bv_block(struct dm_verity *v, struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) struct bvec_iter *iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) int (*process)(struct dm_verity *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) struct dm_verity_io *io, u8 *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) size_t len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) unsigned todo = 1 << v->data_dev_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) u8 *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) unsigned len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) struct bio_vec bv = bio_iter_iovec(bio, *iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) page = kmap_atomic(bv.bv_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) len = bv.bv_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (likely(len >= todo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) len = todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) r = process(v, io, page + bv.bv_offset, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) kunmap_atomic(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (r < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) bio_advance_iter(bio, iter, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) todo -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) } while (todo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) static int verity_bv_zero(struct dm_verity *v, struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) u8 *data, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) memset(data, 0, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * Moves the bio iter one data block forward.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static inline void verity_bv_skip_block(struct dm_verity *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) struct bvec_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) bio_advance_iter(bio, iter, 1 << v->data_dev_block_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * Verify one "dm_verity_io" structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) static int verity_verify_io(struct dm_verity_io *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) bool is_zero;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) struct dm_verity *v = io->v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) struct bvec_iter start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) unsigned b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) struct crypto_wait wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) for (b = 0; b < io->n_blocks; b++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) sector_t cur_block = io->block + b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) struct ahash_request *req = verity_io_hash_req(v, io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (v->validated_blocks &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) likely(test_bit(cur_block, v->validated_blocks))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) verity_bv_skip_block(v, io, &io->iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) r = verity_hash_for_block(v, io, cur_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) verity_io_want_digest(v, io),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) &is_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (is_zero) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * If we expect a zero block, don't validate, just
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * return zeros.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) r = verity_for_bv_block(v, io, &io->iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) verity_bv_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) r = verity_hash_init(v, req, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) start = io->iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) r = verity_for_io_block(v, io, &io->iter, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) r = verity_hash_final(v, req, verity_io_real_digest(v, io),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (unlikely(r < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (likely(memcmp(verity_io_real_digest(v, io),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) verity_io_want_digest(v, io), v->digest_size) == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (v->validated_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) set_bit(cur_block, v->validated_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) else if (verity_fec_decode(v, io, DM_VERITY_BLOCK_TYPE_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) cur_block, NULL, &start) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (bio->bi_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * Error correction failed; Just return error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (verity_handle_err(v, DM_VERITY_BLOCK_TYPE_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) cur_block))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * Skip verity work in response to I/O error when system is shutting down.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) static inline bool verity_is_system_shutting_down(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) || system_state == SYSTEM_RESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * End one "io" structure with a given error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) static void verity_finish_io(struct dm_verity_io *io, blk_status_t status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) struct dm_verity *v = io->v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) bio->bi_end_io = io->orig_bi_end_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) bio->bi_status = status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) verity_fec_finish_io(io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) bio_endio(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) static void verity_work(struct work_struct *w)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) struct dm_verity_io *io = container_of(w, struct dm_verity_io, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) verity_finish_io(io, errno_to_blk_status(verity_verify_io(io)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) static void verity_end_io(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) struct dm_verity_io *io = bio->bi_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (bio->bi_status &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) (!verity_fec_is_enabled(io->v) || verity_is_system_shutting_down())) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) verity_finish_io(io, bio->bi_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) INIT_WORK(&io->work, verity_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) queue_work(io->v->verify_wq, &io->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) * Prefetch buffers for the specified io.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) * The root buffer is not prefetched, it is assumed that it will be cached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) * all the time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) static void verity_prefetch_io(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct dm_verity_prefetch_work *pw =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) container_of(work, struct dm_verity_prefetch_work, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) struct dm_verity *v = pw->v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) for (i = v->levels - 2; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) sector_t hash_block_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) sector_t hash_block_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) verity_hash_at_level(v, pw->block, i, &hash_block_start, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) verity_hash_at_level(v, pw->block + pw->n_blocks - 1, i, &hash_block_end, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (!i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) unsigned cluster = READ_ONCE(dm_verity_prefetch_cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) cluster >>= v->data_dev_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if (unlikely(!cluster))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) goto no_prefetch_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (unlikely(cluster & (cluster - 1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) cluster = 1 << __fls(cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) hash_block_start &= ~(sector_t)(cluster - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) hash_block_end |= cluster - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (unlikely(hash_block_end >= v->hash_blocks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) hash_block_end = v->hash_blocks - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) no_prefetch_cluster:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) dm_bufio_prefetch(v->bufio, hash_block_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) hash_block_end - hash_block_start + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) kfree(pw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) static void verity_submit_prefetch(struct dm_verity *v, struct dm_verity_io *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) sector_t block = io->block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) unsigned int n_blocks = io->n_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) struct dm_verity_prefetch_work *pw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (v->validated_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) while (n_blocks && test_bit(block, v->validated_blocks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) block++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) n_blocks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) while (n_blocks && test_bit(block + n_blocks - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) v->validated_blocks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) n_blocks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (!n_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) pw = kmalloc(sizeof(struct dm_verity_prefetch_work),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) if (!pw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) INIT_WORK(&pw->work, verity_prefetch_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) pw->v = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) pw->block = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) pw->n_blocks = n_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) queue_work(v->verify_wq, &pw->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * Bio map function. It allocates dm_verity_io structure and bio vector and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * fills them. Then it issues prefetches and the I/O.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) static int verity_map(struct dm_target *ti, struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) struct dm_verity *v = ti->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) struct dm_verity_io *io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) bio_set_dev(bio, v->data_dev->bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) bio->bi_iter.bi_sector = verity_map_sector(v, bio->bi_iter.bi_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (((unsigned)bio->bi_iter.bi_sector | bio_sectors(bio)) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) ((1 << (v->data_dev_block_bits - SECTOR_SHIFT)) - 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) DMERR_LIMIT("unaligned io");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return DM_MAPIO_KILL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (bio_end_sector(bio) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) (v->data_dev_block_bits - SECTOR_SHIFT) > v->data_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) DMERR_LIMIT("io out of range");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return DM_MAPIO_KILL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) if (bio_data_dir(bio) == WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) return DM_MAPIO_KILL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) io = dm_per_bio_data(bio, ti->per_io_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) io->v = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) io->orig_bi_end_io = bio->bi_end_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) io->block = bio->bi_iter.bi_sector >> (v->data_dev_block_bits - SECTOR_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) io->n_blocks = bio->bi_iter.bi_size >> v->data_dev_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) bio->bi_end_io = verity_end_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) bio->bi_private = io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) io->iter = bio->bi_iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) verity_fec_init_io(io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) verity_submit_prefetch(v, io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) submit_bio_noacct(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) return DM_MAPIO_SUBMITTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * Status: V (valid) or C (corruption found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) static void verity_status(struct dm_target *ti, status_type_t type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) unsigned status_flags, char *result, unsigned maxlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) struct dm_verity *v = ti->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) unsigned args = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) unsigned sz = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) unsigned x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) case STATUSTYPE_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) DMEMIT("%c", v->hash_failed ? 'C' : 'V');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) case STATUSTYPE_TABLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) DMEMIT("%u %s %s %u %u %llu %llu %s ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) v->version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) v->data_dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) v->hash_dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) 1 << v->data_dev_block_bits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) 1 << v->hash_dev_block_bits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) (unsigned long long)v->data_blocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) (unsigned long long)v->hash_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) v->alg_name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) for (x = 0; x < v->digest_size; x++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) DMEMIT("%02x", v->root_digest[x]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) DMEMIT(" ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) if (!v->salt_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) DMEMIT("-");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) for (x = 0; x < v->salt_size; x++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) DMEMIT("%02x", v->salt[x]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (v->mode != DM_VERITY_MODE_EIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) if (verity_fec_is_enabled(v))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) args += DM_VERITY_OPTS_FEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) if (v->zero_digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (v->validated_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) if (v->signature_key_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) args += DM_VERITY_ROOT_HASH_VERIFICATION_OPTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (!args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) DMEMIT(" %u", args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (v->mode != DM_VERITY_MODE_EIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) DMEMIT(" ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) switch (v->mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) case DM_VERITY_MODE_LOGGING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) DMEMIT(DM_VERITY_OPT_LOGGING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) case DM_VERITY_MODE_RESTART:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) DMEMIT(DM_VERITY_OPT_RESTART);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) case DM_VERITY_MODE_PANIC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) DMEMIT(DM_VERITY_OPT_PANIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) if (v->zero_digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) DMEMIT(" " DM_VERITY_OPT_IGN_ZEROES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) if (v->validated_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) DMEMIT(" " DM_VERITY_OPT_AT_MOST_ONCE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) sz = verity_fec_status_table(v, sz, result, maxlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) if (v->signature_key_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) DMEMIT(" " DM_VERITY_ROOT_HASH_VERIFICATION_OPT_SIG_KEY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) " %s", v->signature_key_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) static int verity_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) struct dm_verity *v = ti->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) *bdev = v->data_dev->bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) if (v->data_start ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) ti->len != i_size_read(v->data_dev->bdev->bd_inode) >> SECTOR_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) static int verity_iterate_devices(struct dm_target *ti,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) iterate_devices_callout_fn fn, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) struct dm_verity *v = ti->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) return fn(ti, v->data_dev, v->data_start, ti->len, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) static void verity_io_hints(struct dm_target *ti, struct queue_limits *limits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) struct dm_verity *v = ti->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (limits->logical_block_size < 1 << v->data_dev_block_bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) limits->logical_block_size = 1 << v->data_dev_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) if (limits->physical_block_size < 1 << v->data_dev_block_bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) limits->physical_block_size = 1 << v->data_dev_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) blk_limits_io_min(limits, limits->logical_block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) static void verity_dtr(struct dm_target *ti)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) struct dm_verity *v = ti->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) if (v->verify_wq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) destroy_workqueue(v->verify_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) if (v->bufio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) dm_bufio_client_destroy(v->bufio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) kvfree(v->validated_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) kfree(v->salt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) kfree(v->root_digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) kfree(v->zero_digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) if (v->tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) crypto_free_ahash(v->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) kfree(v->alg_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) if (v->hash_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) dm_put_device(ti, v->hash_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) if (v->data_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) dm_put_device(ti, v->data_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) verity_fec_dtr(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) kfree(v->signature_key_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) kfree(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) static int verity_alloc_most_once(struct dm_verity *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) struct dm_target *ti = v->ti;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) /* the bitset can only handle INT_MAX blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) if (v->data_blocks > INT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) ti->error = "device too large to use check_at_most_once";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) return -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) v->validated_blocks = kvcalloc(BITS_TO_LONGS(v->data_blocks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) sizeof(unsigned long),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (!v->validated_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) ti->error = "failed to allocate bitset for check_at_most_once";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) static int verity_alloc_zero_digest(struct dm_verity *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) int r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) struct ahash_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) u8 *zero_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) v->zero_digest = kmalloc(v->digest_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) if (!v->zero_digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) req = kmalloc(v->ahash_reqsize, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (!req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) return r; /* verity_dtr will free zero_digest */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) zero_data = kzalloc(1 << v->data_dev_block_bits, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (!zero_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) r = verity_hash(v, req, zero_data, 1 << v->data_dev_block_bits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) v->zero_digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) kfree(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) kfree(zero_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) struct dm_verity_sig_opts *verify_args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) unsigned argc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) struct dm_target *ti = v->ti;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) const char *arg_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) static const struct dm_arg _args[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) {0, DM_VERITY_OPTS_MAX, "Invalid number of feature args"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) r = dm_read_arg_group(_args, as, &argc, &ti->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) if (!argc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) arg_name = dm_shift_arg(as);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) argc--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) if (!strcasecmp(arg_name, DM_VERITY_OPT_LOGGING)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) v->mode = DM_VERITY_MODE_LOGGING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) } else if (!strcasecmp(arg_name, DM_VERITY_OPT_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) v->mode = DM_VERITY_MODE_RESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) } else if (!strcasecmp(arg_name, DM_VERITY_OPT_PANIC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) v->mode = DM_VERITY_MODE_PANIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) } else if (!strcasecmp(arg_name, DM_VERITY_OPT_IGN_ZEROES)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) r = verity_alloc_zero_digest(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) ti->error = "Cannot allocate zero digest";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) } else if (!strcasecmp(arg_name, DM_VERITY_OPT_AT_MOST_ONCE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) r = verity_alloc_most_once(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) } else if (verity_is_fec_opt_arg(arg_name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) r = verity_fec_parse_opt_args(as, v, &argc, arg_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) } else if (verity_verify_is_sig_opt_arg(arg_name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) r = verity_verify_sig_parse_opt_args(as, v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) verify_args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) &argc, arg_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) ti->error = "Unrecognized verity feature request";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) } while (argc && !r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) * Target parameters:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) * <version> The current format is version 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) * Vsn 0 is compatible with original Chromium OS releases.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) * <data device>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) * <hash device>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) * <data block size>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) * <hash block size>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) * <the number of data blocks>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * <hash start block>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) * <algorithm>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * <digest>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * <salt> Hex string or "-" if no salt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) struct dm_verity *v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) struct dm_verity_sig_opts verify_args = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) struct dm_arg_set as;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) unsigned int num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) unsigned long long num_ll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) sector_t hash_position;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) char dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) char *root_hash_digest_to_validate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) v = kzalloc(sizeof(struct dm_verity), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) if (!v) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) ti->error = "Cannot allocate verity structure";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) ti->private = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) v->ti = ti;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) r = verity_fec_ctr_alloc(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) if ((dm_table_get_mode(ti->table) & ~FMODE_READ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) ti->error = "Device must be readonly";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) if (argc < 10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) ti->error = "Not enough arguments";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) if (sscanf(argv[0], "%u%c", &num, &dummy) != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) num > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) ti->error = "Invalid version";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) v->version = num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) r = dm_get_device(ti, argv[1], FMODE_READ, &v->data_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) ti->error = "Data device lookup failed";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) r = dm_get_device(ti, argv[2], FMODE_READ, &v->hash_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) ti->error = "Hash device lookup failed";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) if (sscanf(argv[3], "%u%c", &num, &dummy) != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) !num || (num & (num - 1)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) num < bdev_logical_block_size(v->data_dev->bdev) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) num > PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) ti->error = "Invalid data device block size";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) v->data_dev_block_bits = __ffs(num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) if (sscanf(argv[4], "%u%c", &num, &dummy) != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) !num || (num & (num - 1)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) num < bdev_logical_block_size(v->hash_dev->bdev) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) num > INT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) ti->error = "Invalid hash device block size";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) v->hash_dev_block_bits = __ffs(num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) if (sscanf(argv[5], "%llu%c", &num_ll, &dummy) != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) (sector_t)(num_ll << (v->data_dev_block_bits - SECTOR_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) >> (v->data_dev_block_bits - SECTOR_SHIFT) != num_ll) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) ti->error = "Invalid data blocks";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) v->data_blocks = num_ll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) if (ti->len > (v->data_blocks << (v->data_dev_block_bits - SECTOR_SHIFT))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) ti->error = "Data device is too small";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) if (sscanf(argv[6], "%llu%c", &num_ll, &dummy) != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) (sector_t)(num_ll << (v->hash_dev_block_bits - SECTOR_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) >> (v->hash_dev_block_bits - SECTOR_SHIFT) != num_ll) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) ti->error = "Invalid hash start";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) v->hash_start = num_ll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) v->alg_name = kstrdup(argv[7], GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) if (!v->alg_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) ti->error = "Cannot allocate algorithm name";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) v->tfm = crypto_alloc_ahash(v->alg_name, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) if (IS_ERR(v->tfm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) ti->error = "Cannot initialize hash function";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) r = PTR_ERR(v->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) v->tfm = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) * dm-verity performance can vary greatly depending on which hash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) * algorithm implementation is used. Help people debug performance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) * problems by logging the ->cra_driver_name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) DMINFO("%s using implementation \"%s\"", v->alg_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) crypto_hash_alg_common(v->tfm)->base.cra_driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) v->digest_size = crypto_ahash_digestsize(v->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) if ((1 << v->hash_dev_block_bits) < v->digest_size * 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) ti->error = "Digest size too big";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) v->ahash_reqsize = sizeof(struct ahash_request) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) crypto_ahash_reqsize(v->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) v->root_digest = kmalloc(v->digest_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) if (!v->root_digest) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) ti->error = "Cannot allocate root digest";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) if (strlen(argv[8]) != v->digest_size * 2 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) hex2bin(v->root_digest, argv[8], v->digest_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) ti->error = "Invalid root digest";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) root_hash_digest_to_validate = argv[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) if (strcmp(argv[9], "-")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) v->salt_size = strlen(argv[9]) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) v->salt = kmalloc(v->salt_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (!v->salt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) ti->error = "Cannot allocate salt";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) if (strlen(argv[9]) != v->salt_size * 2 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) hex2bin(v->salt, argv[9], v->salt_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) ti->error = "Invalid salt";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) argv += 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) argc -= 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) /* Optional parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) if (argc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) as.argc = argc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) as.argv = argv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) r = verity_parse_opt_args(&as, v, &verify_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) if (r < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) /* Root hash signature is a optional parameter*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) r = verity_verify_root_hash(root_hash_digest_to_validate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) strlen(root_hash_digest_to_validate),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) verify_args.sig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) verify_args.sig_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) if (r < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) ti->error = "Root hash verification failed";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) v->hash_per_block_bits =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) __fls((1 << v->hash_dev_block_bits) / v->digest_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) v->levels = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) if (v->data_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) while (v->hash_per_block_bits * v->levels < 64 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) (unsigned long long)(v->data_blocks - 1) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) (v->hash_per_block_bits * v->levels))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) v->levels++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) if (v->levels > DM_VERITY_MAX_LEVELS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) ti->error = "Too many tree levels";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) r = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) hash_position = v->hash_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) for (i = v->levels - 1; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) sector_t s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) v->hash_level_block[i] = hash_position;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) s = (v->data_blocks + ((sector_t)1 << ((i + 1) * v->hash_per_block_bits)) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) >> ((i + 1) * v->hash_per_block_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) if (hash_position + s < hash_position) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) ti->error = "Hash device offset overflow";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) r = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) hash_position += s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) v->hash_blocks = hash_position;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) v->bufio = dm_bufio_client_create(v->hash_dev->bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) 1 << v->hash_dev_block_bits, 1, sizeof(struct buffer_aux),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) dm_bufio_alloc_callback, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) if (IS_ERR(v->bufio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) ti->error = "Cannot initialize dm-bufio";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) r = PTR_ERR(v->bufio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) v->bufio = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) if (dm_bufio_get_device_size(v->bufio) < v->hash_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) ti->error = "Hash device is too small";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) r = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) /* WQ_UNBOUND greatly improves performance when running on ramdisk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) v->verify_wq = alloc_workqueue("kverityd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) if (!v->verify_wq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) ti->error = "Cannot allocate workqueue";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) ti->per_io_data_size = sizeof(struct dm_verity_io) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) v->ahash_reqsize + v->digest_size * 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) r = verity_fec_ctr(v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) ti->per_io_data_size = roundup(ti->per_io_data_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) __alignof__(struct dm_verity_io));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) verity_verify_sig_opts_cleanup(&verify_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) bad:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) verity_verify_sig_opts_cleanup(&verify_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) verity_dtr(ti);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) static struct target_type verity_target = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) .name = "verity",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) .version = {1, 7, 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) .module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) .ctr = verity_ctr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) .dtr = verity_dtr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) .map = verity_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) .status = verity_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) .prepare_ioctl = verity_prepare_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) .iterate_devices = verity_iterate_devices,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) .io_hints = verity_io_hints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) static int __init dm_verity_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) r = dm_register_target(&verity_target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) if (r < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) DMERR("register failed %d", r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) static void __exit dm_verity_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) dm_unregister_target(&verity_target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) module_init(dm_verity_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) module_exit(dm_verity_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) MODULE_AUTHOR("Mikulas Patocka <mpatocka@redhat.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) MODULE_AUTHOR("Mandeep Baines <msb@chromium.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) MODULE_AUTHOR("Will Drewry <wad@chromium.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) MODULE_DESCRIPTION(DM_NAME " target for transparent disk integrity checking");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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