/*
* dm-verity volume handling
*
- * Copyright (C) 2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2012-2020 Red Hat, Inc. All rights reserved.
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
size_t i;
if (fread(block, bytes, 1, wr) != 1) {
- log_dbg("EIO while reading spare area.");
+ log_dbg(cd, "EIO while reading spare area.");
return -EIO;
}
for (i = 0; i < bytes; i++)
if (block[i]) {
- log_err(cd, _("Spare area is not zeroed at position %" PRIu64 ".\n"),
+ log_err(cd, _("Spare area is not zeroed at position %" PRIu64 "."),
ftello(wr) - bytes);
return -EPERM;
}
return 0;
}
+static int hash_levels(size_t hash_block_size, size_t digest_size,
+ off_t data_file_blocks, off_t *hash_position, int *levels,
+ off_t *hash_level_block, off_t *hash_level_size)
+{
+ size_t hash_per_block_bits;
+ off_t s, s_shift;
+ int i;
+
+ if (!digest_size)
+ return -EINVAL;
+
+ hash_per_block_bits = get_bits_down(hash_block_size / digest_size);
+ if (!hash_per_block_bits)
+ return -EINVAL;
+
+ *levels = 0;
+ while (hash_per_block_bits * *levels < 64 &&
+ (data_file_blocks - 1) >> (hash_per_block_bits * *levels))
+ (*levels)++;
+
+ if (*levels > VERITY_MAX_LEVELS)
+ return -EINVAL;
+
+ for (i = *levels - 1; i >= 0; i--) {
+ if (hash_level_block)
+ hash_level_block[i] = *hash_position;
+ // verity position of block data_file_blocks at level i
+ s_shift = (i + 1) * hash_per_block_bits;
+ if (s_shift > 63)
+ return -EINVAL;
+ s = (data_file_blocks + ((off_t)1 << s_shift) - 1) >> ((i + 1) * hash_per_block_bits);
+ if (hash_level_size)
+ hash_level_size[i] = s;
+ if ((*hash_position + s) < *hash_position ||
+ (*hash_position + s) < 0)
+ return -EINVAL;
+ *hash_position += s;
+ }
+
+ return 0;
+}
+
static int create_or_verify(struct crypt_device *cd, FILE *rd, FILE *wr,
off_t data_block, size_t data_block_size,
off_t hash_block, size_t hash_block_size,
if (mult_overflow(&seek_rd, data_block, data_block_size) ||
mult_overflow(&seek_wr, hash_block, hash_block_size)) {
- log_err(cd, _("Device offset overflow.\n"));
+ log_err(cd, _("Device offset overflow."));
return -EINVAL;
}
if (fseeko(rd, seek_rd, SEEK_SET)) {
- log_dbg("Cannot seek to requested position in data device.");
+ log_dbg(cd, "Cannot seek to requested position in data device.");
return -EIO;
}
if (wr && fseeko(wr, seek_wr, SEEK_SET)) {
- log_dbg("Cannot seek to requested position in hash device.");
+ log_dbg(cd, "Cannot seek to requested position in hash device.");
return -EIO;
}
break;
blocks--;
if (fread(data_buffer, data_block_size, 1, rd) != 1) {
- log_dbg("Cannot read data device block.");
+ log_dbg(cd, "Cannot read data device block.");
return -EIO;
}
break;
if (verify) {
if (fread(read_digest, digest_size, 1, wr) != 1) {
- log_dbg("Cannot read digest form hash device.");
+ log_dbg(cd, "Cannot read digest form hash device.");
return -EIO;
}
if (memcmp(read_digest, calculated_digest, digest_size)) {
- log_err(cd, _("Verification failed at position %" PRIu64 ".\n"),
+ log_err(cd, _("Verification failed at position %" PRIu64 "."),
ftello(rd) - data_block_size);
return -EPERM;
}
} else {
if (fwrite(calculated_digest, digest_size, 1, wr) != 1) {
- log_dbg("Cannot write digest to hash device.");
+ log_dbg(cd, "Cannot write digest to hash device.");
return -EIO;
}
}
if (r)
return r;
} else if (fwrite(left_block, digest_size_full - digest_size, 1, wr) != 1) {
- log_dbg("Cannot write spare area to hash device.");
+ log_dbg(cd, "Cannot write spare area to hash device.");
return -EIO;
}
}
if (r)
return r;
} else if (fwrite(left_block, left_bytes, 1, wr) != 1) {
- log_dbg("Cannot write remaining spare area to hash device.");
+ log_dbg(cd, "Cannot write remaining spare area to hash device.");
return -EIO;
}
}
FILE *hash_file = NULL, *hash_file_2;
off_t hash_level_block[VERITY_MAX_LEVELS];
off_t hash_level_size[VERITY_MAX_LEVELS];
- off_t data_file_blocks, s;
- size_t hash_per_block, hash_per_block_bits;
+ off_t data_file_blocks;
off_t data_device_size = 0, hash_device_size = 0;
uint64_t dev_size;
int levels, i, r;
- log_dbg("Hash %s %s, data device %s, data blocks %" PRIu64
+ log_dbg(cd, "Hash %s %s, data device %s, data blocks %" PRIu64
", hash_device %s, offset %" PRIu64 ".",
verify ? "verification" : "creation", hash_name,
device_path(data_device), data_blocks,
device_path(hash_device), hash_position);
if (data_blocks < 0 || hash_position < 0) {
- log_err(cd, _("Invalid size parameters for verity device.\n"));
+ log_err(cd, _("Invalid size parameters for verity device."));
return -EINVAL;
}
data_file_blocks = data_blocks;
if (mult_overflow(&data_device_size, data_blocks, data_block_size)) {
- log_err(cd, _("Device offset overflow.\n"));
+ log_err(cd, _("Device offset overflow."));
return -EINVAL;
}
- hash_per_block_bits = get_bits_down(hash_block_size / digest_size);
- hash_per_block = 1 << hash_per_block_bits;
- if (!hash_per_block_bits)
+ if (hash_levels(hash_block_size, digest_size, data_file_blocks, &hash_position,
+ &levels, &hash_level_block[0], &hash_level_size[0])) {
+ log_err(cd, _("Hash area overflow."));
return -EINVAL;
-
- levels = 0;
- if (data_file_blocks) {
- while (hash_per_block_bits * levels < 64 &&
- (data_file_blocks - 1) >> (hash_per_block_bits * levels))
- levels++;
}
- log_dbg("Using %d hash levels.", levels);
- if (levels > VERITY_MAX_LEVELS) {
- log_err(cd, _("Too many tree levels for verity volume.\n"));
- return -EINVAL;
- }
-
- for (i = levels - 1; i >= 0; i--) {
- hash_level_block[i] = hash_position;
- // verity position of block data_file_blocks at level i
- s = data_file_blocks >> (i * hash_per_block_bits);
- s = (s + hash_per_block - 1) / hash_per_block;
- hash_level_size[i] = s;
- if (hash_position + s < hash_position ||
- (hash_position + s) < 0 ||
- (hash_position + s) != hash_position + s) {
- log_err(cd, _("Device offset overflow.\n"));
- return -EINVAL;
- }
- hash_position += s;
- }
+ log_dbg(cd, "Using %d hash levels.", levels);
if (mult_overflow(&hash_device_size, hash_position, hash_block_size)) {
- log_err(cd, _("Device offset overflow.\n"));
+ log_err(cd, _("Device offset overflow."));
return -EINVAL;
}
- log_dbg("Data device size required: %" PRIu64 " bytes.",
+ log_dbg(cd, "Data device size required: %" PRIu64 " bytes.",
data_device_size);
data_file = fopen(device_path(data_device), "r");
if (!data_file) {
- log_err(cd, _("Cannot open device %s.\n"),
+ log_err(cd, _("Cannot open device %s."),
device_path(data_device)
);
r = -EIO;
goto out;
}
- log_dbg("Hash device size required: %" PRIu64 " bytes.",
+ log_dbg(cd, "Hash device size required: %" PRIu64 " bytes.",
hash_device_size);
hash_file = fopen(device_path(hash_device), verify ? "r" : "r+");
if (!hash_file) {
- log_err(cd, _("Cannot open device %s.\n"),
+ log_err(cd, _("Cannot open device %s."),
device_path(hash_device));
r = -EIO;
goto out;
} else {
hash_file_2 = fopen(device_path(hash_device), "r");
if (!hash_file_2) {
- log_err(cd, _("Cannot open device %s.\n"),
+ log_err(cd, _("Cannot open device %s."),
device_path(hash_device));
r = -EIO;
goto out;
out:
if (verify) {
if (r)
- log_err(cd, _("Verification of data area failed.\n"));
+ log_err(cd, _("Verification of data area failed."));
else {
- log_dbg("Verification of data area succeeded.");
+ log_dbg(cd, "Verification of data area succeeded.");
r = memcmp(root_hash, calculated_digest, digest_size) ? -EPERM : 0;
if (r)
- log_err(cd, _("Verification of root hash failed.\n"));
+ log_err(cd, _("Verification of root hash failed."));
else
- log_dbg("Verification of root hash succeeded.");
+ log_dbg(cd, "Verification of root hash succeeded.");
}
} else {
if (r == -EIO)
- log_err(cd, _("Input/output error while creating hash area.\n"));
+ log_err(cd, _("Input/output error while creating hash area."));
else if (r)
- log_err(cd, _("Creation of hash area failed.\n"));
+ log_err(cd, _("Creation of hash area failed."));
else {
fsync(fileno(hash_file));
memcpy(root_hash, calculated_digest, digest_size);
/* Create verity hash */
int VERITY_create(struct crypt_device *cd,
struct crypt_params_verity *verity_hdr,
- char *root_hash,
+ const char *root_hash,
size_t root_hash_size)
{
- unsigned pgsize = crypt_getpagesize();
+ unsigned pgsize = (unsigned)crypt_getpagesize();
if (verity_hdr->salt_size > 256)
return -EINVAL;
if (verity_hdr->data_block_size > pgsize)
log_err(cd, _("WARNING: Kernel cannot activate device if data "
- "block size exceeds page size (%u).\n"), pgsize);
+ "block size exceeds page size (%u)."), pgsize);
return VERITY_create_or_verify_hash(cd, 0,
verity_hdr->hash_type,
verity_hdr->data_block_size,
verity_hdr->data_size,
VERITY_hash_offset_block(verity_hdr),
- root_hash,
+ CONST_CAST(char*)root_hash,
root_hash_size,
verity_hdr->salt,
verity_hdr->salt_size);
}
+
+uint64_t VERITY_hash_blocks(struct crypt_device *cd, struct crypt_params_verity *params)
+{
+ off_t hash_position = 0;
+ int levels = 0;
+
+ if (hash_levels(params->hash_block_size, crypt_get_volume_key_size(cd),
+ params->data_size, &hash_position, &levels, NULL, NULL))
+ return 0;
+
+ return (uint64_t)hash_position;
+}
projects / platform / upstream / cryptsetup.git / blobdiff