1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2003 Jana Saout <jana@saout.de> 4 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> 5 * Copyright (C) 2006-2020 Red Hat, Inc. All rights reserved. 6 * Copyright (C) 2013-2020 Milan Broz <gmazyland@gmail.com> 7 * 8 * This file is released under the GPL. 9 */ 10 11 #include <linux/completion.h> 12 #include <linux/err.h> 13 #include <linux/module.h> 14 #include <linux/hex.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/key.h> 18 #include <linux/bio.h> 19 #include <linux/blkdev.h> 20 #include <linux/blk-integrity.h> 21 #include <linux/crc32.h> 22 #include <linux/mempool.h> 23 #include <linux/slab.h> 24 #include <linux/crypto.h> 25 #include <linux/fips.h> 26 #include <linux/workqueue.h> 27 #include <linux/kthread.h> 28 #include <linux/backing-dev.h> 29 #include <linux/atomic.h> 30 #include <linux/scatterlist.h> 31 #include <linux/rbtree.h> 32 #include <linux/ctype.h> 33 #include <asm/page.h> 34 #include <linux/unaligned.h> 35 #include <crypto/aes.h> 36 #include <crypto/hash.h> 37 #include <crypto/md5.h> 38 #include <crypto/skcipher.h> 39 #include <crypto/aead.h> 40 #include <crypto/authenc.h> 41 #include <crypto/utils.h> 42 #include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */ 43 #include <linux/key-type.h> 44 #include <keys/user-type.h> 45 #include <keys/encrypted-type.h> 46 #include <keys/trusted-type.h> 47 48 #include <linux/device-mapper.h> 49 50 #include "dm-audit.h" 51 52 #define DM_MSG_PREFIX "crypt" 53 54 static DEFINE_IDA(workqueue_ida); 55 56 /* 57 * context holding the current state of a multi-part conversion 58 */ 59 struct convert_context { 60 struct completion restart; 61 struct bio *bio_in; 62 struct bvec_iter iter_in; 63 struct bio *bio_out; 64 struct bvec_iter iter_out; 65 atomic_t cc_pending; 66 unsigned int tag_offset; 67 u64 cc_sector; 68 union { 69 struct skcipher_request *req; 70 struct aead_request *req_aead; 71 } r; 72 bool aead_recheck; 73 bool aead_failed; 74 75 }; 76 77 /* 78 * per bio private data 79 */ 80 struct dm_crypt_io { 81 struct crypt_config *cc; 82 struct bio *base_bio; 83 u8 *integrity_metadata; 84 bool integrity_metadata_from_pool:1; 85 86 struct work_struct work; 87 88 struct convert_context ctx; 89 90 atomic_t io_pending; 91 blk_status_t error; 92 sector_t sector; 93 94 struct bvec_iter saved_bi_iter; 95 96 struct rb_node rb_node; 97 } CRYPTO_MINALIGN_ATTR; 98 99 struct dm_crypt_request { 100 struct convert_context *ctx; 101 struct scatterlist sg_in[4]; 102 struct scatterlist sg_out[4]; 103 u64 iv_sector; 104 }; 105 106 struct crypt_config; 107 108 struct crypt_iv_operations { 109 int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 110 const char *opts); 111 void (*dtr)(struct crypt_config *cc); 112 int (*init)(struct crypt_config *cc); 113 void (*wipe)(struct crypt_config *cc); 114 int (*generator)(struct crypt_config *cc, u8 *iv, 115 struct dm_crypt_request *dmreq); 116 void (*post)(struct crypt_config *cc, u8 *iv, 117 struct dm_crypt_request *dmreq); 118 }; 119 120 struct iv_benbi_private { 121 int shift; 122 }; 123 124 #define LMK_SEED_SIZE 64 /* hash + 0 */ 125 struct iv_lmk_private { 126 u8 *seed; 127 }; 128 129 #define TCW_WHITENING_SIZE 16 130 struct iv_tcw_private { 131 u8 *iv_seed; 132 u8 *whitening; 133 }; 134 135 #define ELEPHANT_MAX_KEY_SIZE 32 136 struct iv_elephant_private { 137 struct aes_enckey *key; 138 }; 139 140 /* 141 * Crypt: maps a linear range of a block device 142 * and encrypts / decrypts at the same time. 143 */ 144 enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 145 DM_CRYPT_SAME_CPU, DM_CRYPT_HIGH_PRIORITY, 146 DM_CRYPT_NO_OFFLOAD, DM_CRYPT_NO_READ_WORKQUEUE, 147 DM_CRYPT_NO_WRITE_WORKQUEUE, DM_CRYPT_WRITE_INLINE }; 148 149 enum cipher_flags { 150 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */ 151 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ 152 CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ 153 CRYPT_KEY_MAC_SIZE_SET, /* The integrity_key_size option was used */ 154 }; 155 156 /* 157 * The fields in here must be read only after initialization. 158 */ 159 struct crypt_config { 160 struct dm_dev *dev; 161 sector_t start; 162 163 struct percpu_counter n_allocated_pages; 164 165 struct workqueue_struct *io_queue; 166 struct workqueue_struct *crypt_queue; 167 168 spinlock_t write_thread_lock; 169 struct task_struct *write_thread; 170 struct rb_root write_tree; 171 172 char *cipher_string; 173 char *cipher_auth; 174 char *key_string; 175 176 const struct crypt_iv_operations *iv_gen_ops; 177 union { 178 struct iv_benbi_private benbi; 179 struct iv_lmk_private lmk; 180 struct iv_tcw_private tcw; 181 struct iv_elephant_private elephant; 182 } iv_gen_private; 183 u64 iv_offset; 184 unsigned int iv_size; 185 unsigned int sector_size; 186 unsigned char sector_shift; 187 188 union { 189 struct crypto_skcipher **tfms; 190 struct crypto_aead **tfms_aead; 191 } cipher_tfm; 192 unsigned int tfms_count; 193 int workqueue_id; 194 unsigned long cipher_flags; 195 196 /* 197 * Layout of each crypto request: 198 * 199 * struct skcipher_request 200 * context 201 * padding 202 * struct dm_crypt_request 203 * padding 204 * IV 205 * 206 * The padding is added so that dm_crypt_request and the IV are 207 * correctly aligned. 208 */ 209 unsigned int dmreq_start; 210 211 unsigned int per_bio_data_size; 212 213 unsigned long flags; 214 unsigned int key_size; 215 unsigned int key_parts; /* independent parts in key buffer */ 216 unsigned int key_extra_size; /* additional keys length */ 217 unsigned int key_mac_size; /* MAC key size for authenc(...) */ 218 219 unsigned int integrity_tag_size; 220 unsigned int integrity_iv_size; 221 unsigned int used_tag_size; 222 unsigned int tuple_size; 223 224 /* 225 * pool for per bio private data, crypto requests, 226 * encryption requeusts/buffer pages and integrity tags 227 */ 228 unsigned int tag_pool_max_sectors; 229 mempool_t tag_pool; 230 mempool_t req_pool; 231 mempool_t page_pool; 232 233 struct bio_set bs; 234 struct mutex bio_alloc_lock; 235 236 u8 *authenc_key; /* space for keys in authenc() format (if used) */ 237 u8 key[] __counted_by(key_size); 238 }; 239 240 #define MIN_IOS 64 241 #define MAX_TAG_SIZE 480 242 #define POOL_ENTRY_SIZE 512 243 244 /* 245 * Largest encryption sector size that can be requested with the 246 * "sector_size:<bytes>" option. 247 * 248 * A sector is handed to the crypto API as a single scatterlist entry, so it 249 * has to be covered by one bio_vec. bio_iter_iovec() never returns more than 250 * PAGE_SIZE bytes, and crypt_alloc_buffer() may fall back to order-0 pages 251 * for the write bounce buffer, so PAGE_SIZE is the ceiling. 252 * 253 * crypt_io_hints() announces the sector size as the logical block size, which 254 * the block layer caps at BLK_MAX_BLOCK_SIZE. That cap is never below 255 * PAGE_SIZE in any configuration today, so it does not lower the limit; take 256 * the minimum anyway so that this target cannot announce a block size 257 * blk_validate_limits() would reject. 258 */ 259 #define DM_CRYPT_MAX_SECTOR_SIZE MIN_T(unsigned int, PAGE_SIZE, \ 260 BLK_MAX_BLOCK_SIZE) 261 262 static DEFINE_SPINLOCK(dm_crypt_clients_lock); 263 static unsigned int dm_crypt_clients_n; 264 static volatile unsigned long dm_crypt_pages_per_client; 265 #define DM_CRYPT_MEMORY_PERCENT 2 266 #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_VECS * 16) 267 #define DM_CRYPT_DEFAULT_MAX_READ_SIZE 131072 268 #define DM_CRYPT_DEFAULT_MAX_WRITE_SIZE 131072 269 270 static unsigned int max_read_size = 0; 271 module_param(max_read_size, uint, 0644); 272 MODULE_PARM_DESC(max_read_size, "Maximum size of a read request"); 273 static unsigned int max_write_size = 0; 274 module_param(max_write_size, uint, 0644); 275 MODULE_PARM_DESC(max_write_size, "Maximum size of a write request"); 276 277 static unsigned get_max_request_sectors(struct dm_target *ti, struct bio *bio, bool no_split) 278 { 279 struct crypt_config *cc = ti->private; 280 unsigned val, sector_align; 281 bool wrt = op_is_write(bio_op(bio)); 282 283 if (no_split) { 284 val = -1; 285 } else if (wrt) { 286 val = min_not_zero(READ_ONCE(max_write_size), 287 DM_CRYPT_DEFAULT_MAX_WRITE_SIZE); 288 } else { 289 val = min_not_zero(READ_ONCE(max_read_size), 290 DM_CRYPT_DEFAULT_MAX_READ_SIZE); 291 } 292 293 if (wrt || cc->used_tag_size) 294 val = min(val, BIO_MAX_VECS << PAGE_SHIFT); 295 296 sector_align = max(bdev_logical_block_size(cc->dev->bdev), 297 (unsigned)cc->sector_size); 298 val = round_down(val, sector_align); 299 if (unlikely(!val)) 300 val = sector_align; 301 return val >> SECTOR_SHIFT; 302 } 303 304 static void crypt_endio(struct bio *clone); 305 static void kcryptd_queue_crypt(struct dm_crypt_io *io); 306 static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 307 struct scatterlist *sg); 308 309 static bool crypt_integrity_aead(struct crypt_config *cc); 310 311 /* 312 * Use this to access cipher attributes that are independent of the key. 313 */ 314 static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 315 { 316 return cc->cipher_tfm.tfms[0]; 317 } 318 319 static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 320 { 321 return cc->cipher_tfm.tfms_aead[0]; 322 } 323 324 /* 325 * Different IV generation algorithms: 326 * 327 * plain: the initial vector is the 32-bit little-endian version of the sector 328 * number, padded with zeros if necessary. 329 * 330 * plain64: the initial vector is the 64-bit little-endian version of the sector 331 * number, padded with zeros if necessary. 332 * 333 * plain64be: the initial vector is the 64-bit big-endian version of the sector 334 * number, padded with zeros if necessary. 335 * 336 * essiv: "encrypted sector|salt initial vector", the sector number is 337 * encrypted with the bulk cipher using a salt as key. The salt 338 * should be derived from the bulk cipher's key via hashing. 339 * 340 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 341 * (needed for LRW-32-AES and possible other narrow block modes) 342 * 343 * null: the initial vector is always zero. Provides compatibility with 344 * obsolete loop_fish2 devices. Do not use for new devices. 345 * 346 * lmk: Compatible implementation of the block chaining mode used 347 * by the Loop-AES block device encryption system 348 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 349 * It operates on full 512 byte sectors and uses CBC 350 * with an IV derived from the sector number, the data and 351 * optionally extra IV seed. 352 * This means that after decryption the first block 353 * of sector must be tweaked according to decrypted data. 354 * Loop-AES can use three encryption schemes: 355 * version 1: is plain aes-cbc mode 356 * version 2: uses 64 multikey scheme with lmk IV generator 357 * version 3: the same as version 2 with additional IV seed 358 * (it uses 65 keys, last key is used as IV seed) 359 * 360 * tcw: Compatible implementation of the block chaining mode used 361 * by the TrueCrypt device encryption system (prior to version 4.1). 362 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 363 * It operates on full 512 byte sectors and uses CBC 364 * with an IV derived from initial key and the sector number. 365 * In addition, whitening value is applied on every sector, whitening 366 * is calculated from initial key, sector number and mixed using CRC32. 367 * Note that this encryption scheme is vulnerable to watermarking attacks 368 * and should be used for old compatible containers access only. 369 * 370 * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) 371 * The IV is encrypted little-endian byte-offset (with the same key 372 * and cipher as the volume). 373 * 374 * elephant: The extended version of eboiv with additional Elephant diffuser 375 * used with Bitlocker CBC mode. 376 * This mode was used in older Windows systems 377 * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf 378 */ 379 380 static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 381 struct dm_crypt_request *dmreq) 382 { 383 memset(iv, 0, cc->iv_size); 384 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 385 386 return 0; 387 } 388 389 static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 390 struct dm_crypt_request *dmreq) 391 { 392 memset(iv, 0, cc->iv_size); 393 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 394 395 return 0; 396 } 397 398 static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, 399 struct dm_crypt_request *dmreq) 400 { 401 memset(iv, 0, cc->iv_size); 402 /* iv_size is at least of size u64; usually it is 16 bytes */ 403 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); 404 405 return 0; 406 } 407 408 static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 409 struct dm_crypt_request *dmreq) 410 { 411 /* 412 * ESSIV encryption of the IV is now handled by the crypto API, 413 * so just pass the plain sector number here. 414 */ 415 memset(iv, 0, cc->iv_size); 416 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 417 418 return 0; 419 } 420 421 static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 422 const char *opts) 423 { 424 unsigned int bs; 425 int log; 426 427 if (crypt_integrity_aead(cc)) 428 bs = crypto_aead_blocksize(any_tfm_aead(cc)); 429 else 430 bs = crypto_skcipher_blocksize(any_tfm(cc)); 431 log = ilog2(bs); 432 433 /* 434 * We need to calculate how far we must shift the sector count 435 * to get the cipher block count, we use this shift in _gen. 436 */ 437 if (1 << log != bs) { 438 ti->error = "cypher blocksize is not a power of 2"; 439 return -EINVAL; 440 } 441 442 if (log > 9) { 443 ti->error = "cypher blocksize is > 512"; 444 return -EINVAL; 445 } 446 447 cc->iv_gen_private.benbi.shift = 9 - log; 448 449 return 0; 450 } 451 452 static void crypt_iv_benbi_dtr(struct crypt_config *cc) 453 { 454 } 455 456 static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 457 struct dm_crypt_request *dmreq) 458 { 459 __be64 val; 460 461 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 462 463 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 464 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 465 466 return 0; 467 } 468 469 static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 470 struct dm_crypt_request *dmreq) 471 { 472 memset(iv, 0, cc->iv_size); 473 474 return 0; 475 } 476 477 static void crypt_iv_lmk_dtr(struct crypt_config *cc) 478 { 479 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 480 481 kfree_sensitive(lmk->seed); 482 lmk->seed = NULL; 483 } 484 485 static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 486 const char *opts) 487 { 488 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 489 490 if (cc->sector_size != (1 << SECTOR_SHIFT)) { 491 ti->error = "Unsupported sector size for LMK"; 492 return -EINVAL; 493 } 494 495 if (fips_enabled) { 496 ti->error = "LMK support is disabled due to FIPS"; 497 /* ... because it uses MD5. */ 498 return -EINVAL; 499 } 500 501 /* No seed in LMK version 2 */ 502 if (cc->key_parts == cc->tfms_count) { 503 lmk->seed = NULL; 504 return 0; 505 } 506 507 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 508 if (!lmk->seed) { 509 ti->error = "Error kmallocing seed storage in LMK"; 510 return -ENOMEM; 511 } 512 513 return 0; 514 } 515 516 static int crypt_iv_lmk_init(struct crypt_config *cc) 517 { 518 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 519 int subkey_size = cc->key_size / cc->key_parts; 520 521 /* LMK seed is on the position of LMK_KEYS + 1 key */ 522 if (lmk->seed) 523 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 524 MD5_DIGEST_SIZE); 525 526 return 0; 527 } 528 529 static void crypt_iv_lmk_wipe(struct crypt_config *cc) 530 { 531 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 532 533 if (lmk->seed) 534 memzero_explicit(lmk->seed, LMK_SEED_SIZE); 535 } 536 537 static void crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 538 struct dm_crypt_request *dmreq, u8 *data) 539 { 540 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 541 struct md5_ctx ctx; 542 __le32 buf[4]; 543 544 md5_init(&ctx); 545 546 if (lmk->seed) 547 md5_update(&ctx, lmk->seed, LMK_SEED_SIZE); 548 549 /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 550 md5_update(&ctx, data + 16, 16 * 31); 551 552 /* Sector is cropped to 56 bits here */ 553 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 554 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 555 buf[2] = cpu_to_le32(4024); 556 buf[3] = 0; 557 md5_update(&ctx, (u8 *)buf, sizeof(buf)); 558 559 /* No MD5 padding here */ 560 cpu_to_le32_array(ctx.state.h, ARRAY_SIZE(ctx.state.h)); 561 memcpy(iv, ctx.state.h, cc->iv_size); 562 } 563 564 static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 565 struct dm_crypt_request *dmreq) 566 { 567 struct scatterlist *sg; 568 u8 *src; 569 570 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 571 sg = crypt_get_sg_data(cc, dmreq->sg_in); 572 src = kmap_local_page(sg_page(sg)); 573 crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 574 kunmap_local(src); 575 } else 576 memset(iv, 0, cc->iv_size); 577 return 0; 578 } 579 580 static void crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 581 struct dm_crypt_request *dmreq) 582 { 583 struct scatterlist *sg; 584 u8 *dst; 585 586 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 587 return; 588 589 sg = crypt_get_sg_data(cc, dmreq->sg_out); 590 dst = kmap_local_page(sg_page(sg)); 591 crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 592 593 /* Tweak the first block of plaintext sector */ 594 crypto_xor(dst + sg->offset, iv, cc->iv_size); 595 596 kunmap_local(dst); 597 } 598 599 static void crypt_iv_tcw_dtr(struct crypt_config *cc) 600 { 601 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 602 603 kfree_sensitive(tcw->iv_seed); 604 tcw->iv_seed = NULL; 605 kfree_sensitive(tcw->whitening); 606 tcw->whitening = NULL; 607 } 608 609 static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 610 const char *opts) 611 { 612 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 613 614 if (cc->sector_size != (1 << SECTOR_SHIFT)) { 615 ti->error = "Unsupported sector size for TCW"; 616 return -EINVAL; 617 } 618 619 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 620 ti->error = "Wrong key size for TCW"; 621 return -EINVAL; 622 } 623 624 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 625 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 626 if (!tcw->iv_seed || !tcw->whitening) { 627 crypt_iv_tcw_dtr(cc); 628 ti->error = "Error allocating seed storage in TCW"; 629 return -ENOMEM; 630 } 631 632 return 0; 633 } 634 635 static int crypt_iv_tcw_init(struct crypt_config *cc) 636 { 637 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 638 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 639 640 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 641 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 642 TCW_WHITENING_SIZE); 643 644 return 0; 645 } 646 647 static void crypt_iv_tcw_wipe(struct crypt_config *cc) 648 { 649 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 650 651 memzero_explicit(tcw->iv_seed, cc->iv_size); 652 memzero_explicit(tcw->whitening, TCW_WHITENING_SIZE); 653 } 654 655 static void crypt_iv_tcw_whitening(struct crypt_config *cc, 656 struct dm_crypt_request *dmreq, u8 *data) 657 { 658 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 659 __le64 sector = cpu_to_le64(dmreq->iv_sector); 660 u8 buf[TCW_WHITENING_SIZE]; 661 int i; 662 663 /* xor whitening with sector number */ 664 crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); 665 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); 666 667 /* calculate crc32 for every 32bit part and xor it */ 668 for (i = 0; i < 4; i++) 669 put_unaligned_le32(crc32(0, &buf[i * 4], 4), &buf[i * 4]); 670 crypto_xor(&buf[0], &buf[12], 4); 671 crypto_xor(&buf[4], &buf[8], 4); 672 673 /* apply whitening (8 bytes) to whole sector */ 674 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 675 crypto_xor(data + i * 8, buf, 8); 676 memzero_explicit(buf, sizeof(buf)); 677 } 678 679 static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 680 struct dm_crypt_request *dmreq) 681 { 682 struct scatterlist *sg; 683 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 684 __le64 sector = cpu_to_le64(dmreq->iv_sector); 685 u8 *src; 686 687 /* Remove whitening from ciphertext */ 688 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 689 sg = crypt_get_sg_data(cc, dmreq->sg_in); 690 src = kmap_local_page(sg_page(sg)); 691 crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 692 kunmap_local(src); 693 } 694 695 /* Calculate IV */ 696 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); 697 if (cc->iv_size > 8) 698 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, 699 cc->iv_size - 8); 700 701 return 0; 702 } 703 704 static void crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 705 struct dm_crypt_request *dmreq) 706 { 707 struct scatterlist *sg; 708 u8 *dst; 709 710 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 711 return; 712 713 /* Apply whitening on ciphertext */ 714 sg = crypt_get_sg_data(cc, dmreq->sg_out); 715 dst = kmap_local_page(sg_page(sg)); 716 crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 717 kunmap_local(dst); 718 } 719 720 static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 721 struct dm_crypt_request *dmreq) 722 { 723 /* Used only for writes, there must be an additional space to store IV */ 724 get_random_bytes(iv, cc->iv_size); 725 return 0; 726 } 727 728 static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, 729 const char *opts) 730 { 731 if (crypt_integrity_aead(cc)) { 732 ti->error = "AEAD transforms not supported for EBOIV"; 733 return -EINVAL; 734 } 735 736 if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) { 737 ti->error = "Block size of EBOIV cipher does not match IV size of block cipher"; 738 return -EINVAL; 739 } 740 741 return 0; 742 } 743 744 static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, 745 struct dm_crypt_request *dmreq) 746 { 747 struct crypto_skcipher *tfm = any_tfm(cc); 748 struct skcipher_request *req; 749 struct scatterlist src, dst; 750 DECLARE_CRYPTO_WAIT(wait); 751 unsigned int reqsize; 752 int err; 753 u8 *buf; 754 755 reqsize = sizeof(*req) + crypto_skcipher_reqsize(tfm); 756 reqsize = ALIGN(reqsize, __alignof__(__le64)); 757 758 req = kmalloc(reqsize + cc->iv_size, GFP_NOIO); 759 if (!req) 760 return -ENOMEM; 761 762 skcipher_request_set_tfm(req, tfm); 763 764 buf = (u8 *)req + reqsize; 765 memset(buf, 0, cc->iv_size); 766 *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 767 768 sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size); 769 sg_init_one(&dst, iv, cc->iv_size); 770 skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf); 771 skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 772 err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 773 kfree_sensitive(req); 774 775 return err; 776 } 777 778 static void crypt_iv_elephant_dtr(struct crypt_config *cc) 779 { 780 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 781 782 kfree_sensitive(elephant->key); 783 elephant->key = NULL; 784 } 785 786 static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti, 787 const char *opts) 788 { 789 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 790 int r; 791 792 elephant->key = kmalloc_obj(*elephant->key); 793 if (!elephant->key) 794 return -ENOMEM; 795 796 r = crypt_iv_eboiv_ctr(cc, ti, NULL); 797 if (r) 798 crypt_iv_elephant_dtr(cc); 799 return r; 800 } 801 802 static void diffuser_disk_to_cpu(u32 *d, size_t n) 803 { 804 #ifndef __LITTLE_ENDIAN 805 int i; 806 807 for (i = 0; i < n; i++) 808 d[i] = le32_to_cpu((__le32)d[i]); 809 #endif 810 } 811 812 static void diffuser_cpu_to_disk(__le32 *d, size_t n) 813 { 814 #ifndef __LITTLE_ENDIAN 815 int i; 816 817 for (i = 0; i < n; i++) 818 d[i] = cpu_to_le32((u32)d[i]); 819 #endif 820 } 821 822 static void diffuser_a_decrypt(u32 *d, size_t n) 823 { 824 int i, i1, i2, i3; 825 826 for (i = 0; i < 5; i++) { 827 i1 = 0; 828 i2 = n - 2; 829 i3 = n - 5; 830 831 while (i1 < (n - 1)) { 832 d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 833 i1++; i2++; i3++; 834 835 if (i3 >= n) 836 i3 -= n; 837 838 d[i1] += d[i2] ^ d[i3]; 839 i1++; i2++; i3++; 840 841 if (i2 >= n) 842 i2 -= n; 843 844 d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 845 i1++; i2++; i3++; 846 847 d[i1] += d[i2] ^ d[i3]; 848 i1++; i2++; i3++; 849 } 850 } 851 } 852 853 static void diffuser_a_encrypt(u32 *d, size_t n) 854 { 855 int i, i1, i2, i3; 856 857 for (i = 0; i < 5; i++) { 858 i1 = n - 1; 859 i2 = n - 2 - 1; 860 i3 = n - 5 - 1; 861 862 while (i1 > 0) { 863 d[i1] -= d[i2] ^ d[i3]; 864 i1--; i2--; i3--; 865 866 d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 867 i1--; i2--; i3--; 868 869 if (i2 < 0) 870 i2 += n; 871 872 d[i1] -= d[i2] ^ d[i3]; 873 i1--; i2--; i3--; 874 875 if (i3 < 0) 876 i3 += n; 877 878 d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 879 i1--; i2--; i3--; 880 } 881 } 882 } 883 884 static void diffuser_b_decrypt(u32 *d, size_t n) 885 { 886 int i, i1, i2, i3; 887 888 for (i = 0; i < 3; i++) { 889 i1 = 0; 890 i2 = 2; 891 i3 = 5; 892 893 while (i1 < (n - 1)) { 894 d[i1] += d[i2] ^ d[i3]; 895 i1++; i2++; i3++; 896 897 d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 898 i1++; i2++; i3++; 899 900 if (i2 >= n) 901 i2 -= n; 902 903 d[i1] += d[i2] ^ d[i3]; 904 i1++; i2++; i3++; 905 906 if (i3 >= n) 907 i3 -= n; 908 909 d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 910 i1++; i2++; i3++; 911 } 912 } 913 } 914 915 static void diffuser_b_encrypt(u32 *d, size_t n) 916 { 917 int i, i1, i2, i3; 918 919 for (i = 0; i < 3; i++) { 920 i1 = n - 1; 921 i2 = 2 - 1; 922 i3 = 5 - 1; 923 924 while (i1 > 0) { 925 d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 926 i1--; i2--; i3--; 927 928 if (i3 < 0) 929 i3 += n; 930 931 d[i1] -= d[i2] ^ d[i3]; 932 i1--; i2--; i3--; 933 934 if (i2 < 0) 935 i2 += n; 936 937 d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 938 i1--; i2--; i3--; 939 940 d[i1] -= d[i2] ^ d[i3]; 941 i1--; i2--; i3--; 942 } 943 } 944 } 945 946 static void crypt_iv_elephant(struct crypt_config *cc, 947 struct dm_crypt_request *dmreq) 948 { 949 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 950 u8 *data, *data2, *data_offset; 951 struct scatterlist *sg, *sg2; 952 union { 953 __le64 w[2]; 954 u8 b[16]; 955 } es; 956 u8 ks[32] __aligned(__alignof(long)); /* Elephant sector key */ 957 int i; 958 959 es.w[0] = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 960 es.w[1] = 0; 961 962 /* E(Ks, e(s)) */ 963 aes_encrypt(elephant->key, &ks[0], es.b); 964 965 /* E(Ks, e'(s)) */ 966 es.b[15] = 0x80; 967 aes_encrypt(elephant->key, &ks[16], es.b); 968 969 sg = crypt_get_sg_data(cc, dmreq->sg_out); 970 data = kmap_local_page(sg_page(sg)); 971 data_offset = data + sg->offset; 972 973 /* Cannot modify original bio, copy to sg_out and apply Elephant to it */ 974 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 975 sg2 = crypt_get_sg_data(cc, dmreq->sg_in); 976 data2 = kmap_local_page(sg_page(sg2)); 977 memcpy(data_offset, data2 + sg2->offset, cc->sector_size); 978 kunmap_local(data2); 979 } 980 981 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 982 diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32)); 983 diffuser_b_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 984 diffuser_a_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 985 diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32)); 986 } 987 988 for (i = 0; i < (cc->sector_size / 32); i++) 989 crypto_xor(data_offset + i * 32, ks, 32); 990 991 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 992 diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32)); 993 diffuser_a_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 994 diffuser_b_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 995 diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32)); 996 } 997 998 kunmap_local(data); 999 memzero_explicit(ks, sizeof(ks)); 1000 memzero_explicit(&es, sizeof(es)); 1001 } 1002 1003 static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv, 1004 struct dm_crypt_request *dmreq) 1005 { 1006 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 1007 crypt_iv_elephant(cc, dmreq); 1008 1009 return crypt_iv_eboiv_gen(cc, iv, dmreq); 1010 } 1011 1012 static void crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv, 1013 struct dm_crypt_request *dmreq) 1014 { 1015 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 1016 crypt_iv_elephant(cc, dmreq); 1017 } 1018 1019 static int crypt_iv_elephant_init(struct crypt_config *cc) 1020 { 1021 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1022 int key_offset = cc->key_size - cc->key_extra_size; 1023 1024 return aes_prepareenckey(elephant->key, &cc->key[key_offset], cc->key_extra_size); 1025 } 1026 1027 static void crypt_iv_elephant_wipe(struct crypt_config *cc) 1028 { 1029 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1030 1031 memzero_explicit(elephant->key, sizeof(*elephant->key)); 1032 } 1033 1034 static const struct crypt_iv_operations crypt_iv_plain_ops = { 1035 .generator = crypt_iv_plain_gen 1036 }; 1037 1038 static const struct crypt_iv_operations crypt_iv_plain64_ops = { 1039 .generator = crypt_iv_plain64_gen 1040 }; 1041 1042 static const struct crypt_iv_operations crypt_iv_plain64be_ops = { 1043 .generator = crypt_iv_plain64be_gen 1044 }; 1045 1046 static const struct crypt_iv_operations crypt_iv_essiv_ops = { 1047 .generator = crypt_iv_essiv_gen 1048 }; 1049 1050 static const struct crypt_iv_operations crypt_iv_benbi_ops = { 1051 .ctr = crypt_iv_benbi_ctr, 1052 .dtr = crypt_iv_benbi_dtr, 1053 .generator = crypt_iv_benbi_gen 1054 }; 1055 1056 static const struct crypt_iv_operations crypt_iv_null_ops = { 1057 .generator = crypt_iv_null_gen 1058 }; 1059 1060 static const struct crypt_iv_operations crypt_iv_lmk_ops = { 1061 .ctr = crypt_iv_lmk_ctr, 1062 .dtr = crypt_iv_lmk_dtr, 1063 .init = crypt_iv_lmk_init, 1064 .wipe = crypt_iv_lmk_wipe, 1065 .generator = crypt_iv_lmk_gen, 1066 .post = crypt_iv_lmk_post 1067 }; 1068 1069 static const struct crypt_iv_operations crypt_iv_tcw_ops = { 1070 .ctr = crypt_iv_tcw_ctr, 1071 .dtr = crypt_iv_tcw_dtr, 1072 .init = crypt_iv_tcw_init, 1073 .wipe = crypt_iv_tcw_wipe, 1074 .generator = crypt_iv_tcw_gen, 1075 .post = crypt_iv_tcw_post 1076 }; 1077 1078 static const struct crypt_iv_operations crypt_iv_random_ops = { 1079 .generator = crypt_iv_random_gen 1080 }; 1081 1082 static const struct crypt_iv_operations crypt_iv_eboiv_ops = { 1083 .ctr = crypt_iv_eboiv_ctr, 1084 .generator = crypt_iv_eboiv_gen 1085 }; 1086 1087 static const struct crypt_iv_operations crypt_iv_elephant_ops = { 1088 .ctr = crypt_iv_elephant_ctr, 1089 .dtr = crypt_iv_elephant_dtr, 1090 .init = crypt_iv_elephant_init, 1091 .wipe = crypt_iv_elephant_wipe, 1092 .generator = crypt_iv_elephant_gen, 1093 .post = crypt_iv_elephant_post 1094 }; 1095 1096 /* 1097 * Integrity extensions 1098 */ 1099 static bool crypt_integrity_aead(struct crypt_config *cc) 1100 { 1101 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 1102 } 1103 1104 static bool crypt_integrity_hmac(struct crypt_config *cc) 1105 { 1106 return crypt_integrity_aead(cc) && cc->key_mac_size; 1107 } 1108 1109 /* Get sg containing data */ 1110 static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 1111 struct scatterlist *sg) 1112 { 1113 if (unlikely(crypt_integrity_aead(cc))) 1114 return &sg[2]; 1115 1116 return sg; 1117 } 1118 1119 static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 1120 { 1121 struct bio_integrity_payload *bip; 1122 unsigned int tag_len; 1123 int ret; 1124 1125 if (!bio_sectors(bio) || !io->cc->tuple_size) 1126 return 0; 1127 1128 bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 1129 if (IS_ERR(bip)) 1130 return PTR_ERR(bip); 1131 1132 tag_len = io->cc->tuple_size * (bio_sectors(bio) >> io->cc->sector_shift); 1133 1134 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; 1135 1136 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 1137 tag_len, offset_in_page(io->integrity_metadata)); 1138 if (unlikely(ret != tag_len)) 1139 return -ENOMEM; 1140 1141 return 0; 1142 } 1143 1144 static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 1145 { 1146 #ifdef CONFIG_BLK_DEV_INTEGRITY 1147 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 1148 struct mapped_device *md = dm_table_get_md(ti->table); 1149 1150 /* We require an underlying device with non-PI metadata */ 1151 if (!bi || bi->csum_type != BLK_INTEGRITY_CSUM_NONE) { 1152 ti->error = "Integrity profile not supported."; 1153 return -EINVAL; 1154 } 1155 1156 if (bi->metadata_size < cc->used_tag_size) { 1157 ti->error = "Integrity profile tag size mismatch."; 1158 return -EINVAL; 1159 } 1160 cc->tuple_size = bi->metadata_size; 1161 if (1 << bi->interval_exp != cc->sector_size) { 1162 ti->error = "Integrity profile sector size mismatch."; 1163 return -EINVAL; 1164 } 1165 1166 if (crypt_integrity_aead(cc)) { 1167 cc->integrity_tag_size = cc->used_tag_size - cc->integrity_iv_size; 1168 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), 1169 cc->integrity_tag_size, cc->integrity_iv_size); 1170 1171 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 1172 ti->error = "Integrity AEAD auth tag size is not supported."; 1173 return -EINVAL; 1174 } 1175 } else if (cc->integrity_iv_size) 1176 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), 1177 cc->integrity_iv_size); 1178 1179 if ((cc->integrity_tag_size + cc->integrity_iv_size) > cc->tuple_size) { 1180 ti->error = "Not enough space for integrity tag in the profile."; 1181 return -EINVAL; 1182 } 1183 1184 return 0; 1185 #else 1186 ti->error = "Integrity profile not supported."; 1187 return -EINVAL; 1188 #endif 1189 } 1190 1191 static void crypt_convert_init(struct crypt_config *cc, 1192 struct convert_context *ctx, 1193 struct bio *bio_out, struct bio *bio_in, 1194 sector_t sector) 1195 { 1196 ctx->bio_in = bio_in; 1197 ctx->bio_out = bio_out; 1198 if (bio_in) 1199 ctx->iter_in = bio_in->bi_iter; 1200 if (bio_out) 1201 ctx->iter_out = bio_out->bi_iter; 1202 ctx->cc_sector = sector + cc->iv_offset; 1203 ctx->tag_offset = 0; 1204 init_completion(&ctx->restart); 1205 } 1206 1207 static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 1208 void *req) 1209 { 1210 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 1211 } 1212 1213 static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 1214 { 1215 return (void *)((char *)dmreq - cc->dmreq_start); 1216 } 1217 1218 static u8 *iv_of_dmreq(struct crypt_config *cc, 1219 struct dm_crypt_request *dmreq) 1220 { 1221 if (crypt_integrity_aead(cc)) 1222 return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1223 crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 1224 else 1225 return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1226 crypto_skcipher_alignmask(any_tfm(cc)) + 1); 1227 } 1228 1229 static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1230 struct dm_crypt_request *dmreq) 1231 { 1232 return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1233 } 1234 1235 static __le64 *org_sector_of_dmreq(struct crypt_config *cc, 1236 struct dm_crypt_request *dmreq) 1237 { 1238 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1239 1240 return (__le64 *) ptr; 1241 } 1242 1243 static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1244 struct dm_crypt_request *dmreq) 1245 { 1246 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1247 cc->iv_size + sizeof(uint64_t); 1248 1249 return (unsigned int *)ptr; 1250 } 1251 1252 static void *tag_from_dmreq(struct crypt_config *cc, 1253 struct dm_crypt_request *dmreq) 1254 { 1255 struct convert_context *ctx = dmreq->ctx; 1256 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1257 1258 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1259 cc->tuple_size]; 1260 } 1261 1262 static void *iv_tag_from_dmreq(struct crypt_config *cc, 1263 struct dm_crypt_request *dmreq) 1264 { 1265 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1266 } 1267 1268 static int crypt_convert_block_aead(struct crypt_config *cc, 1269 struct convert_context *ctx, 1270 struct aead_request *req, 1271 unsigned int tag_offset) 1272 { 1273 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1274 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1275 struct dm_crypt_request *dmreq; 1276 u8 *iv, *org_iv, *tag_iv, *tag; 1277 __le64 *sector; 1278 int r = 0; 1279 1280 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 1281 1282 /* Reject unexpected unaligned bio. */ 1283 if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 1284 return -EIO; 1285 1286 dmreq = dmreq_of_req(cc, req); 1287 dmreq->iv_sector = ctx->cc_sector; 1288 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1289 dmreq->iv_sector >>= cc->sector_shift; 1290 dmreq->ctx = ctx; 1291 1292 *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1293 1294 sector = org_sector_of_dmreq(cc, dmreq); 1295 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1296 1297 iv = iv_of_dmreq(cc, dmreq); 1298 org_iv = org_iv_of_dmreq(cc, dmreq); 1299 tag = tag_from_dmreq(cc, dmreq); 1300 tag_iv = iv_tag_from_dmreq(cc, dmreq); 1301 1302 /* AEAD request: 1303 * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1304 * | (authenticated) | (auth+encryption) | | 1305 * | sector_LE | IV | sector in/out | tag in/out | 1306 */ 1307 sg_init_table(dmreq->sg_in, 4); 1308 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1309 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 1310 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1311 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1312 1313 sg_init_table(dmreq->sg_out, 4); 1314 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1315 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 1316 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1317 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 1318 1319 if (cc->iv_gen_ops) { 1320 /* For READs use IV stored in integrity metadata */ 1321 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1322 memcpy(org_iv, tag_iv, cc->iv_size); 1323 } else { 1324 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1325 if (r < 0) 1326 return r; 1327 /* Store generated IV in integrity metadata */ 1328 if (cc->integrity_iv_size) 1329 memcpy(tag_iv, org_iv, cc->iv_size); 1330 } 1331 /* Working copy of IV, to be modified in crypto API */ 1332 memcpy(iv, org_iv, cc->iv_size); 1333 } 1334 1335 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1336 if (bio_data_dir(ctx->bio_in) == WRITE) { 1337 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1338 cc->sector_size, iv); 1339 r = crypto_aead_encrypt(req); 1340 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->tuple_size) 1341 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1342 cc->tuple_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1343 } else { 1344 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1345 cc->sector_size + cc->integrity_tag_size, iv); 1346 r = crypto_aead_decrypt(req); 1347 } 1348 1349 if (r == -EBADMSG) { 1350 sector_t s = le64_to_cpu(*sector); 1351 1352 ctx->aead_failed = true; 1353 if (ctx->aead_recheck) { 1354 DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu", 1355 ctx->bio_in->bi_bdev, s); 1356 dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", 1357 ctx->bio_in, s, 0); 1358 } 1359 } 1360 1361 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1362 cc->iv_gen_ops->post(cc, org_iv, dmreq); 1363 1364 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 1365 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1366 1367 return r; 1368 } 1369 1370 static int crypt_convert_block_skcipher(struct crypt_config *cc, 1371 struct convert_context *ctx, 1372 struct skcipher_request *req, 1373 unsigned int tag_offset) 1374 { 1375 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1376 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1377 struct scatterlist *sg_in, *sg_out; 1378 struct dm_crypt_request *dmreq; 1379 u8 *iv, *org_iv, *tag_iv; 1380 __le64 *sector; 1381 int r = 0; 1382 1383 /* Reject unexpected unaligned bio. */ 1384 if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 1385 return -EIO; 1386 1387 dmreq = dmreq_of_req(cc, req); 1388 dmreq->iv_sector = ctx->cc_sector; 1389 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1390 dmreq->iv_sector >>= cc->sector_shift; 1391 dmreq->ctx = ctx; 1392 1393 *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1394 1395 iv = iv_of_dmreq(cc, dmreq); 1396 org_iv = org_iv_of_dmreq(cc, dmreq); 1397 tag_iv = iv_tag_from_dmreq(cc, dmreq); 1398 1399 sector = org_sector_of_dmreq(cc, dmreq); 1400 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1401 1402 /* For skcipher we use only the first sg item */ 1403 sg_in = &dmreq->sg_in[0]; 1404 sg_out = &dmreq->sg_out[0]; 1405 1406 sg_init_table(sg_in, 1); 1407 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1408 1409 sg_init_table(sg_out, 1); 1410 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1411 1412 if (cc->iv_gen_ops) { 1413 /* For READs use IV stored in integrity metadata */ 1414 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1415 memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1416 } else { 1417 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1418 if (r < 0) 1419 return r; 1420 /* Data can be already preprocessed in generator */ 1421 if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags)) 1422 sg_in = sg_out; 1423 /* Store generated IV in integrity metadata */ 1424 if (cc->integrity_iv_size) 1425 memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1426 } 1427 /* Working copy of IV, to be modified in crypto API */ 1428 memcpy(iv, org_iv, cc->iv_size); 1429 } 1430 1431 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); 1432 1433 if (bio_data_dir(ctx->bio_in) == WRITE) 1434 r = crypto_skcipher_encrypt(req); 1435 else 1436 r = crypto_skcipher_decrypt(req); 1437 1438 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1439 cc->iv_gen_ops->post(cc, org_iv, dmreq); 1440 1441 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 1442 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1443 1444 return r; 1445 } 1446 1447 static void kcryptd_async_done(void *async_req, int error); 1448 1449 static int crypt_alloc_req_skcipher(struct crypt_config *cc, 1450 struct convert_context *ctx) 1451 { 1452 unsigned int key_index = ctx->cc_sector & (cc->tfms_count - 1); 1453 1454 if (!ctx->r.req) { 1455 ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1456 if (!ctx->r.req) 1457 return -ENOMEM; 1458 } 1459 1460 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 1461 1462 /* 1463 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1464 * requests if driver request queue is full. 1465 */ 1466 skcipher_request_set_callback(ctx->r.req, 1467 CRYPTO_TFM_REQ_MAY_BACKLOG, 1468 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1469 1470 return 0; 1471 } 1472 1473 static int crypt_alloc_req_aead(struct crypt_config *cc, 1474 struct convert_context *ctx) 1475 { 1476 if (!ctx->r.req_aead) { 1477 ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1478 if (!ctx->r.req_aead) 1479 return -ENOMEM; 1480 } 1481 1482 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1483 1484 /* 1485 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1486 * requests if driver request queue is full. 1487 */ 1488 aead_request_set_callback(ctx->r.req_aead, 1489 CRYPTO_TFM_REQ_MAY_BACKLOG, 1490 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1491 1492 return 0; 1493 } 1494 1495 static int crypt_alloc_req(struct crypt_config *cc, 1496 struct convert_context *ctx) 1497 { 1498 if (crypt_integrity_aead(cc)) 1499 return crypt_alloc_req_aead(cc, ctx); 1500 else 1501 return crypt_alloc_req_skcipher(cc, ctx); 1502 } 1503 1504 static void crypt_free_req_skcipher(struct crypt_config *cc, 1505 struct skcipher_request *req, struct bio *base_bio) 1506 { 1507 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1508 1509 if ((struct skcipher_request *)(io + 1) != req) 1510 mempool_free(req, &cc->req_pool); 1511 } 1512 1513 static void crypt_free_req_aead(struct crypt_config *cc, 1514 struct aead_request *req, struct bio *base_bio) 1515 { 1516 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1517 1518 if ((struct aead_request *)(io + 1) != req) 1519 mempool_free(req, &cc->req_pool); 1520 } 1521 1522 static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1523 { 1524 if (crypt_integrity_aead(cc)) 1525 crypt_free_req_aead(cc, req, base_bio); 1526 else 1527 crypt_free_req_skcipher(cc, req, base_bio); 1528 } 1529 1530 /* 1531 * Encrypt / decrypt data from one bio to another one (can be the same one) 1532 */ 1533 static blk_status_t crypt_convert(struct crypt_config *cc, 1534 struct convert_context *ctx, bool atomic, bool reset_pending) 1535 { 1536 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; 1537 int r; 1538 1539 /* 1540 * if reset_pending is set we are dealing with the bio for the first time, 1541 * else we're continuing to work on the previous bio, so don't mess with 1542 * the cc_pending counter 1543 */ 1544 if (reset_pending) 1545 atomic_set(&ctx->cc_pending, 1); 1546 1547 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 1548 1549 r = crypt_alloc_req(cc, ctx); 1550 if (r) { 1551 complete(&ctx->restart); 1552 return BLK_STS_DEV_RESOURCE; 1553 } 1554 1555 atomic_inc(&ctx->cc_pending); 1556 1557 if (crypt_integrity_aead(cc)) 1558 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, ctx->tag_offset); 1559 else 1560 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, ctx->tag_offset); 1561 1562 switch (r) { 1563 /* 1564 * The request was queued by a crypto driver 1565 * but the driver request queue is full, let's wait. 1566 */ 1567 case -EBUSY: 1568 if (in_interrupt()) { 1569 if (try_wait_for_completion(&ctx->restart)) { 1570 /* 1571 * we don't have to block to wait for completion, 1572 * so proceed 1573 */ 1574 } else { 1575 /* 1576 * we can't wait for completion without blocking 1577 * exit and continue processing in a workqueue 1578 */ 1579 ctx->r.req = NULL; 1580 ctx->tag_offset++; 1581 ctx->cc_sector += sector_step; 1582 return BLK_STS_DEV_RESOURCE; 1583 } 1584 } else { 1585 wait_for_completion(&ctx->restart); 1586 } 1587 reinit_completion(&ctx->restart); 1588 fallthrough; 1589 /* 1590 * The request is queued and processed asynchronously, 1591 * completion function kcryptd_async_done() will be called. 1592 */ 1593 case -EINPROGRESS: 1594 ctx->r.req = NULL; 1595 ctx->tag_offset++; 1596 ctx->cc_sector += sector_step; 1597 continue; 1598 /* 1599 * The request was already processed (synchronously). 1600 */ 1601 case 0: 1602 atomic_dec(&ctx->cc_pending); 1603 ctx->cc_sector += sector_step; 1604 ctx->tag_offset++; 1605 if (!atomic) 1606 cond_resched(); 1607 continue; 1608 /* 1609 * There was a data integrity error. 1610 */ 1611 case -EBADMSG: 1612 atomic_dec(&ctx->cc_pending); 1613 return BLK_STS_PROTECTION; 1614 /* 1615 * There was an error while processing the request. 1616 */ 1617 default: 1618 atomic_dec(&ctx->cc_pending); 1619 return BLK_STS_IOERR; 1620 } 1621 } 1622 1623 return 0; 1624 } 1625 1626 static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1627 1628 /* 1629 * Generate a new unfragmented bio with the given size 1630 * This should never violate the device limitations (but if it did then block 1631 * core should split the bio as needed). 1632 * 1633 * This function may be called concurrently. If we allocate from the mempool 1634 * concurrently, there is a possibility of deadlock. For example, if we have 1635 * mempool of 256 pages, two processes, each wanting 256, pages allocate from 1636 * the mempool concurrently, it may deadlock in a situation where both processes 1637 * have allocated 128 pages and the mempool is exhausted. 1638 * 1639 * In order to avoid this scenario we allocate the pages under a mutex. 1640 * 1641 * In order to not degrade performance with excessive locking, we try 1642 * non-blocking allocations without a mutex first but on failure we fallback 1643 * to blocking allocations with a mutex. 1644 * 1645 * In order to reduce allocation overhead, we try to allocate compound pages in 1646 * the first pass. If they are not available, we fall back to the mempool. 1647 */ 1648 static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size) 1649 { 1650 struct crypt_config *cc = io->cc; 1651 struct bio *clone; 1652 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1653 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 1654 unsigned int remaining_size; 1655 unsigned int order = MAX_PAGE_ORDER; 1656 1657 retry: 1658 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 1659 mutex_lock(&cc->bio_alloc_lock); 1660 1661 clone = bio_alloc_bioset(cc->dev->bdev, nr_iovecs, io->base_bio->bi_opf, 1662 GFP_NOIO, &cc->bs); 1663 clone->bi_private = io; 1664 clone->bi_end_io = crypt_endio; 1665 clone->bi_ioprio = io->base_bio->bi_ioprio; 1666 clone->bi_iter.bi_sector = cc->start + io->sector; 1667 1668 remaining_size = size; 1669 1670 while (remaining_size) { 1671 struct page *pages; 1672 unsigned size_to_add; 1673 unsigned remaining_order = __fls((remaining_size + PAGE_SIZE - 1) >> PAGE_SHIFT); 1674 order = min(order, remaining_order); 1675 1676 while (order > 0) { 1677 if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) + 1678 (1 << order) > dm_crypt_pages_per_client)) 1679 goto decrease_order; 1680 pages = alloc_pages(gfp_mask 1681 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | __GFP_COMP, 1682 order); 1683 if (likely(pages != NULL)) { 1684 percpu_counter_add(&cc->n_allocated_pages, 1 << order); 1685 goto have_pages; 1686 } 1687 decrease_order: 1688 order--; 1689 } 1690 1691 pages = mempool_alloc(&cc->page_pool, gfp_mask); 1692 if (!pages) { 1693 crypt_free_buffer_pages(cc, clone); 1694 bio_put(clone); 1695 gfp_mask |= __GFP_DIRECT_RECLAIM; 1696 order = 0; 1697 goto retry; 1698 } 1699 1700 have_pages: 1701 size_to_add = min((unsigned)PAGE_SIZE << order, remaining_size); 1702 __bio_add_page(clone, pages, size_to_add, 0); 1703 remaining_size -= size_to_add; 1704 } 1705 1706 /* Allocate space for integrity tags */ 1707 if (dm_crypt_integrity_io_alloc(io, clone)) { 1708 crypt_free_buffer_pages(cc, clone); 1709 bio_put(clone); 1710 clone = NULL; 1711 } 1712 1713 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 1714 mutex_unlock(&cc->bio_alloc_lock); 1715 1716 return clone; 1717 } 1718 1719 static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 1720 { 1721 struct folio_iter fi; 1722 1723 if (clone->bi_vcnt > 0) { /* bio_for_each_folio_all crashes with an empty bio */ 1724 bio_for_each_folio_all(fi, clone) { 1725 if (folio_test_large(fi.folio)) { 1726 percpu_counter_sub(&cc->n_allocated_pages, 1727 folio_nr_pages(fi.folio)); 1728 folio_put(fi.folio); 1729 } else { 1730 mempool_free(&fi.folio->page, &cc->page_pool); 1731 } 1732 } 1733 } 1734 } 1735 1736 static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1737 struct bio *bio, sector_t sector) 1738 { 1739 io->cc = cc; 1740 io->base_bio = bio; 1741 io->sector = sector; 1742 io->error = 0; 1743 io->ctx.aead_recheck = false; 1744 io->ctx.aead_failed = false; 1745 io->ctx.r.req = NULL; 1746 io->integrity_metadata = NULL; 1747 io->integrity_metadata_from_pool = false; 1748 atomic_set(&io->io_pending, 0); 1749 } 1750 1751 static void crypt_inc_pending(struct dm_crypt_io *io) 1752 { 1753 atomic_inc(&io->io_pending); 1754 } 1755 1756 static void kcryptd_queue_read(struct dm_crypt_io *io); 1757 1758 /* 1759 * One of the bios was finished. Check for completion of 1760 * the whole request and correctly clean up the buffer. 1761 */ 1762 static void crypt_dec_pending(struct dm_crypt_io *io) 1763 { 1764 struct crypt_config *cc = io->cc; 1765 struct bio *base_bio = io->base_bio; 1766 1767 if (!atomic_dec_and_test(&io->io_pending)) 1768 return; 1769 1770 if (likely(!io->ctx.aead_recheck) && unlikely(io->ctx.aead_failed) && 1771 cc->used_tag_size && bio_data_dir(base_bio) == READ) { 1772 io->ctx.aead_recheck = true; 1773 io->ctx.aead_failed = false; 1774 io->error = 0; 1775 kcryptd_queue_read(io); 1776 return; 1777 } 1778 1779 if (io->ctx.r.req) 1780 crypt_free_req(cc, io->ctx.r.req, base_bio); 1781 1782 if (unlikely(io->integrity_metadata_from_pool)) 1783 mempool_free(io->integrity_metadata, &io->cc->tag_pool); 1784 else 1785 kfree(io->integrity_metadata); 1786 1787 base_bio->bi_status = io->error; 1788 1789 bio_endio(base_bio); 1790 } 1791 1792 /* 1793 * kcryptd/kcryptd_io: 1794 * 1795 * Needed because it would be very unwise to do decryption in an 1796 * interrupt context. 1797 * 1798 * kcryptd performs the actual encryption or decryption. 1799 * 1800 * kcryptd_io performs the IO submission. 1801 * 1802 * They must be separated as otherwise the final stages could be 1803 * starved by new requests which can block in the first stages due 1804 * to memory allocation. 1805 * 1806 * The work is done per CPU global for all dm-crypt instances. 1807 * They should not depend on each other and do not block. 1808 */ 1809 static void crypt_endio(struct bio *clone) 1810 { 1811 struct dm_crypt_io *io = clone->bi_private; 1812 struct crypt_config *cc = io->cc; 1813 unsigned int rw = bio_data_dir(clone); 1814 blk_status_t error = clone->bi_status; 1815 1816 if (io->ctx.aead_recheck && !error) { 1817 kcryptd_queue_crypt(io); 1818 return; 1819 } 1820 1821 /* 1822 * free the processed pages 1823 */ 1824 if (rw == WRITE || io->ctx.aead_recheck) 1825 crypt_free_buffer_pages(cc, clone); 1826 1827 bio_put(clone); 1828 1829 if (rw == READ && !error) { 1830 kcryptd_queue_crypt(io); 1831 return; 1832 } 1833 1834 if (unlikely(error)) 1835 io->error = error; 1836 1837 crypt_dec_pending(io); 1838 } 1839 1840 #define CRYPT_MAP_READ_GFP GFP_NOWAIT 1841 1842 static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 1843 { 1844 struct crypt_config *cc = io->cc; 1845 struct bio *clone; 1846 1847 if (io->ctx.aead_recheck) { 1848 if (!(gfp & __GFP_DIRECT_RECLAIM)) 1849 return 1; 1850 crypt_inc_pending(io); 1851 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 1852 if (unlikely(!clone)) { 1853 crypt_dec_pending(io); 1854 return 1; 1855 } 1856 crypt_convert_init(cc, &io->ctx, clone, clone, io->sector); 1857 io->saved_bi_iter = clone->bi_iter; 1858 dm_submit_bio_remap(io->base_bio, clone); 1859 return 0; 1860 } 1861 1862 /* 1863 * We need the original biovec array in order to decrypt the whole bio 1864 * data *afterwards* -- thanks to immutable biovecs we don't need to 1865 * worry about the block layer modifying the biovec array; so leverage 1866 * bio_alloc_clone(). 1867 */ 1868 clone = bio_alloc_clone(cc->dev->bdev, io->base_bio, gfp, &cc->bs); 1869 if (!clone) 1870 return 1; 1871 1872 clone->bi_iter.bi_sector = cc->start + io->sector; 1873 clone->bi_private = io; 1874 clone->bi_end_io = crypt_endio; 1875 1876 crypt_inc_pending(io); 1877 1878 if (dm_crypt_integrity_io_alloc(io, clone)) { 1879 crypt_dec_pending(io); 1880 bio_put(clone); 1881 return 1; 1882 } 1883 1884 dm_submit_bio_remap(io->base_bio, clone); 1885 return 0; 1886 } 1887 1888 static void kcryptd_io_read_work(struct work_struct *work) 1889 { 1890 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1891 1892 crypt_inc_pending(io); 1893 if (kcryptd_io_read(io, GFP_NOIO)) 1894 io->error = BLK_STS_RESOURCE; 1895 crypt_dec_pending(io); 1896 } 1897 1898 static void kcryptd_queue_read(struct dm_crypt_io *io) 1899 { 1900 struct crypt_config *cc = io->cc; 1901 1902 INIT_WORK(&io->work, kcryptd_io_read_work); 1903 queue_work(cc->io_queue, &io->work); 1904 } 1905 1906 static void kcryptd_io_write(struct dm_crypt_io *io) 1907 { 1908 struct bio *clone = io->ctx.bio_out; 1909 1910 dm_submit_bio_remap(io->base_bio, clone); 1911 } 1912 1913 #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1914 1915 static int dmcrypt_write(void *data) 1916 { 1917 struct crypt_config *cc = data; 1918 struct dm_crypt_io *io; 1919 1920 while (1) { 1921 struct rb_root write_tree; 1922 struct blk_plug plug; 1923 1924 spin_lock_irq(&cc->write_thread_lock); 1925 continue_locked: 1926 1927 if (!RB_EMPTY_ROOT(&cc->write_tree)) 1928 goto pop_from_list; 1929 1930 set_current_state(TASK_INTERRUPTIBLE); 1931 1932 spin_unlock_irq(&cc->write_thread_lock); 1933 1934 if (unlikely(kthread_should_stop())) { 1935 set_current_state(TASK_RUNNING); 1936 break; 1937 } 1938 1939 schedule(); 1940 1941 spin_lock_irq(&cc->write_thread_lock); 1942 goto continue_locked; 1943 1944 pop_from_list: 1945 write_tree = cc->write_tree; 1946 cc->write_tree = RB_ROOT; 1947 spin_unlock_irq(&cc->write_thread_lock); 1948 1949 BUG_ON(rb_parent(write_tree.rb_node)); 1950 1951 /* 1952 * Note: we cannot walk the tree here with rb_next because 1953 * the structures may be freed when kcryptd_io_write is called. 1954 */ 1955 blk_start_plug(&plug); 1956 do { 1957 io = crypt_io_from_node(rb_first(&write_tree)); 1958 rb_erase(&io->rb_node, &write_tree); 1959 kcryptd_io_write(io); 1960 cond_resched(); 1961 } while (!RB_EMPTY_ROOT(&write_tree)); 1962 blk_finish_plug(&plug); 1963 } 1964 return 0; 1965 } 1966 1967 static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 1968 { 1969 struct bio *clone = io->ctx.bio_out; 1970 struct crypt_config *cc = io->cc; 1971 unsigned long flags; 1972 sector_t sector; 1973 struct rb_node **rbp, *parent; 1974 1975 if (unlikely(io->error)) { 1976 crypt_free_buffer_pages(cc, clone); 1977 bio_put(clone); 1978 crypt_dec_pending(io); 1979 return; 1980 } 1981 1982 /* crypt_convert should have filled the clone bio */ 1983 BUG_ON(io->ctx.iter_out.bi_size); 1984 1985 if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) || 1986 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) { 1987 dm_submit_bio_remap(io->base_bio, clone); 1988 return; 1989 } 1990 1991 spin_lock_irqsave(&cc->write_thread_lock, flags); 1992 if (RB_EMPTY_ROOT(&cc->write_tree)) 1993 wake_up_process(cc->write_thread); 1994 rbp = &cc->write_tree.rb_node; 1995 parent = NULL; 1996 sector = io->sector; 1997 while (*rbp) { 1998 parent = *rbp; 1999 if (sector < crypt_io_from_node(parent)->sector) 2000 rbp = &(*rbp)->rb_left; 2001 else 2002 rbp = &(*rbp)->rb_right; 2003 } 2004 rb_link_node(&io->rb_node, parent, rbp); 2005 rb_insert_color(&io->rb_node, &cc->write_tree); 2006 spin_unlock_irqrestore(&cc->write_thread_lock, flags); 2007 } 2008 2009 static bool kcryptd_crypt_write_inline(struct crypt_config *cc, 2010 struct convert_context *ctx) 2011 2012 { 2013 if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags)) 2014 return false; 2015 2016 /* 2017 * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering 2018 * constraints so they do not need to be issued inline by 2019 * kcryptd_crypt_write_convert(). 2020 */ 2021 switch (bio_op(ctx->bio_in)) { 2022 case REQ_OP_WRITE: 2023 case REQ_OP_WRITE_ZEROES: 2024 return true; 2025 default: 2026 return false; 2027 } 2028 } 2029 2030 static void kcryptd_crypt_write_continue(struct work_struct *work) 2031 { 2032 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 2033 struct crypt_config *cc = io->cc; 2034 struct convert_context *ctx = &io->ctx; 2035 int crypt_finished; 2036 blk_status_t r; 2037 2038 wait_for_completion(&ctx->restart); 2039 reinit_completion(&ctx->restart); 2040 2041 r = crypt_convert(cc, &io->ctx, false, false); 2042 if (r) 2043 io->error = r; 2044 crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 2045 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 2046 /* Wait for completion signaled by kcryptd_async_done() */ 2047 wait_for_completion(&ctx->restart); 2048 crypt_finished = 1; 2049 } 2050 2051 /* Encryption was already finished, submit io now */ 2052 if (crypt_finished) 2053 kcryptd_crypt_write_io_submit(io, 0); 2054 2055 crypt_dec_pending(io); 2056 } 2057 2058 static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 2059 { 2060 struct crypt_config *cc = io->cc; 2061 struct convert_context *ctx = &io->ctx; 2062 struct bio *clone; 2063 int crypt_finished; 2064 blk_status_t r; 2065 2066 /* 2067 * Prevent io from disappearing until this function completes. 2068 */ 2069 crypt_inc_pending(io); 2070 crypt_convert_init(cc, ctx, NULL, io->base_bio, io->sector); 2071 2072 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 2073 if (unlikely(!clone)) { 2074 io->error = BLK_STS_IOERR; 2075 goto dec; 2076 } 2077 2078 io->ctx.bio_out = clone; 2079 io->ctx.iter_out = clone->bi_iter; 2080 2081 if (crypt_integrity_aead(cc)) { 2082 bio_copy_data(clone, io->base_bio); 2083 io->ctx.bio_in = clone; 2084 io->ctx.iter_in = clone->bi_iter; 2085 } 2086 2087 crypt_inc_pending(io); 2088 r = crypt_convert(cc, ctx, 2089 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true); 2090 /* 2091 * Crypto API backlogged the request, because its queue was full 2092 * and we're in softirq context, so continue from a workqueue 2093 * (TODO: is it actually possible to be in softirq in the write path?) 2094 */ 2095 if (r == BLK_STS_DEV_RESOURCE) { 2096 INIT_WORK(&io->work, kcryptd_crypt_write_continue); 2097 queue_work(cc->crypt_queue, &io->work); 2098 return; 2099 } 2100 if (r) 2101 io->error = r; 2102 crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 2103 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 2104 /* Wait for completion signaled by kcryptd_async_done() */ 2105 wait_for_completion(&ctx->restart); 2106 crypt_finished = 1; 2107 } 2108 2109 /* Encryption was already finished, submit io now */ 2110 if (crypt_finished) 2111 kcryptd_crypt_write_io_submit(io, 0); 2112 2113 dec: 2114 crypt_dec_pending(io); 2115 } 2116 2117 static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 2118 { 2119 if (io->ctx.aead_recheck) { 2120 if (!io->error) { 2121 io->ctx.bio_in->bi_iter = io->saved_bi_iter; 2122 bio_copy_data(io->base_bio, io->ctx.bio_in); 2123 } 2124 crypt_free_buffer_pages(io->cc, io->ctx.bio_in); 2125 bio_put(io->ctx.bio_in); 2126 } 2127 crypt_dec_pending(io); 2128 } 2129 2130 static void kcryptd_crypt_read_continue(struct work_struct *work) 2131 { 2132 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 2133 struct crypt_config *cc = io->cc; 2134 blk_status_t r; 2135 2136 wait_for_completion(&io->ctx.restart); 2137 reinit_completion(&io->ctx.restart); 2138 2139 r = crypt_convert(cc, &io->ctx, false, false); 2140 if (r) 2141 io->error = r; 2142 2143 if (atomic_dec_and_test(&io->ctx.cc_pending)) 2144 kcryptd_crypt_read_done(io); 2145 2146 crypt_dec_pending(io); 2147 } 2148 2149 static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 2150 { 2151 struct crypt_config *cc = io->cc; 2152 blk_status_t r; 2153 2154 crypt_inc_pending(io); 2155 2156 if (io->ctx.aead_recheck) { 2157 r = crypt_convert(cc, &io->ctx, 2158 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); 2159 } else { 2160 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 2161 io->sector); 2162 2163 r = crypt_convert(cc, &io->ctx, 2164 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); 2165 } 2166 /* 2167 * Crypto API backlogged the request, because its queue was full 2168 * and we're in softirq context, so continue from a workqueue 2169 */ 2170 if (r == BLK_STS_DEV_RESOURCE) { 2171 INIT_WORK(&io->work, kcryptd_crypt_read_continue); 2172 queue_work(cc->crypt_queue, &io->work); 2173 return; 2174 } 2175 if (r) 2176 io->error = r; 2177 2178 if (atomic_dec_and_test(&io->ctx.cc_pending)) 2179 kcryptd_crypt_read_done(io); 2180 2181 crypt_dec_pending(io); 2182 } 2183 2184 static void kcryptd_async_done(void *data, int error) 2185 { 2186 struct dm_crypt_request *dmreq = data; 2187 struct convert_context *ctx = dmreq->ctx; 2188 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 2189 struct crypt_config *cc = io->cc; 2190 2191 /* 2192 * A request from crypto driver backlog is going to be processed now, 2193 * finish the completion and continue in crypt_convert(). 2194 * (Callback will be called for the second time for this request.) 2195 */ 2196 if (error == -EINPROGRESS) { 2197 complete(&ctx->restart); 2198 return; 2199 } 2200 2201 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 2202 cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 2203 2204 if (error == -EBADMSG) { 2205 sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)); 2206 2207 ctx->aead_failed = true; 2208 if (ctx->aead_recheck) { 2209 DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu", 2210 ctx->bio_in->bi_bdev, s); 2211 dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", 2212 ctx->bio_in, s, 0); 2213 } 2214 io->error = BLK_STS_PROTECTION; 2215 } else if (error < 0) 2216 io->error = BLK_STS_IOERR; 2217 2218 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 2219 2220 if (!atomic_dec_and_test(&ctx->cc_pending)) 2221 return; 2222 2223 /* 2224 * The request is fully completed: for inline writes, let 2225 * kcryptd_crypt_write_convert() do the IO submission. 2226 */ 2227 if (bio_data_dir(io->base_bio) == READ) { 2228 kcryptd_crypt_read_done(io); 2229 return; 2230 } 2231 2232 if (kcryptd_crypt_write_inline(cc, ctx)) { 2233 complete(&ctx->restart); 2234 return; 2235 } 2236 2237 kcryptd_crypt_write_io_submit(io, 1); 2238 } 2239 2240 static void kcryptd_crypt(struct work_struct *work) 2241 { 2242 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 2243 2244 if (bio_data_dir(io->base_bio) == READ) 2245 kcryptd_crypt_read_convert(io); 2246 else 2247 kcryptd_crypt_write_convert(io); 2248 } 2249 2250 static void kcryptd_queue_crypt(struct dm_crypt_io *io) 2251 { 2252 struct crypt_config *cc = io->cc; 2253 2254 if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) || 2255 (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) { 2256 /* 2257 * in_hardirq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context. 2258 * irqs_disabled(): the kernel may run some IO completion from the idle thread, but 2259 * it is being executed with irqs disabled. 2260 */ 2261 if (in_hardirq() || irqs_disabled()) { 2262 INIT_WORK(&io->work, kcryptd_crypt); 2263 queue_work(system_bh_wq, &io->work); 2264 return; 2265 } else { 2266 kcryptd_crypt(&io->work); 2267 return; 2268 } 2269 } 2270 2271 INIT_WORK(&io->work, kcryptd_crypt); 2272 queue_work(cc->crypt_queue, &io->work); 2273 } 2274 2275 static void crypt_free_tfms_aead(struct crypt_config *cc) 2276 { 2277 if (!cc->cipher_tfm.tfms_aead) 2278 return; 2279 2280 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2281 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 2282 cc->cipher_tfm.tfms_aead[0] = NULL; 2283 } 2284 2285 kfree(cc->cipher_tfm.tfms_aead); 2286 cc->cipher_tfm.tfms_aead = NULL; 2287 } 2288 2289 static void crypt_free_tfms_skcipher(struct crypt_config *cc) 2290 { 2291 unsigned int i; 2292 2293 if (!cc->cipher_tfm.tfms) 2294 return; 2295 2296 for (i = 0; i < cc->tfms_count; i++) 2297 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 2298 crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 2299 cc->cipher_tfm.tfms[i] = NULL; 2300 } 2301 2302 kfree(cc->cipher_tfm.tfms); 2303 cc->cipher_tfm.tfms = NULL; 2304 } 2305 2306 static void crypt_free_tfms(struct crypt_config *cc) 2307 { 2308 if (crypt_integrity_aead(cc)) 2309 crypt_free_tfms_aead(cc); 2310 else 2311 crypt_free_tfms_skcipher(cc); 2312 } 2313 2314 static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 2315 { 2316 unsigned int i; 2317 int err; 2318 2319 cc->cipher_tfm.tfms = kzalloc_objs(struct crypto_skcipher *, 2320 cc->tfms_count); 2321 if (!cc->cipher_tfm.tfms) 2322 return -ENOMEM; 2323 2324 for (i = 0; i < cc->tfms_count; i++) { 2325 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 2326 CRYPTO_ALG_ALLOCATES_MEMORY); 2327 if (IS_ERR(cc->cipher_tfm.tfms[i])) { 2328 err = PTR_ERR(cc->cipher_tfm.tfms[i]); 2329 crypt_free_tfms(cc); 2330 return err; 2331 } 2332 } 2333 2334 /* 2335 * dm-crypt performance can vary greatly depending on which crypto 2336 * algorithm implementation is used. Help people debug performance 2337 * problems by logging the ->cra_driver_name. 2338 */ 2339 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2340 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); 2341 return 0; 2342 } 2343 2344 static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 2345 { 2346 int err; 2347 2348 cc->cipher_tfm.tfms = kmalloc_obj(struct crypto_skcipher *); 2349 if (!cc->cipher_tfm.tfms) 2350 return -ENOMEM; 2351 2352 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 2353 CRYPTO_ALG_ALLOCATES_MEMORY); 2354 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2355 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 2356 crypt_free_tfms(cc); 2357 return err; 2358 } 2359 2360 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2361 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); 2362 return 0; 2363 } 2364 2365 static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 2366 { 2367 if (crypt_integrity_aead(cc)) 2368 return crypt_alloc_tfms_aead(cc, ciphermode); 2369 else 2370 return crypt_alloc_tfms_skcipher(cc, ciphermode); 2371 } 2372 2373 static unsigned int crypt_subkey_size(struct crypt_config *cc) 2374 { 2375 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 2376 } 2377 2378 static unsigned int crypt_authenckey_size(struct crypt_config *cc) 2379 { 2380 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 2381 } 2382 2383 /* 2384 * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 2385 * the key must be for some reason in special format. 2386 * This function converts cc->key to this special format. 2387 */ 2388 static void crypt_copy_authenckey(char *p, const void *key, 2389 unsigned int enckeylen, unsigned int authkeylen) 2390 { 2391 struct crypto_authenc_key_param *param; 2392 struct rtattr *rta; 2393 2394 rta = (struct rtattr *)p; 2395 param = RTA_DATA(rta); 2396 param->enckeylen = cpu_to_be32(enckeylen); 2397 rta->rta_len = RTA_LENGTH(sizeof(*param)); 2398 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 2399 p += RTA_SPACE(sizeof(*param)); 2400 memcpy(p, key + enckeylen, authkeylen); 2401 p += authkeylen; 2402 memcpy(p, key, enckeylen); 2403 } 2404 2405 static int crypt_setkey(struct crypt_config *cc) 2406 { 2407 unsigned int subkey_size; 2408 int err = 0, i, r; 2409 2410 /* Ignore extra keys (which are used for IV etc) */ 2411 subkey_size = crypt_subkey_size(cc); 2412 2413 if (crypt_integrity_hmac(cc)) { 2414 if (subkey_size < cc->key_mac_size) 2415 return -EINVAL; 2416 2417 crypt_copy_authenckey(cc->authenc_key, cc->key, 2418 subkey_size - cc->key_mac_size, 2419 cc->key_mac_size); 2420 } 2421 2422 for (i = 0; i < cc->tfms_count; i++) { 2423 if (crypt_integrity_hmac(cc)) 2424 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2425 cc->authenc_key, crypt_authenckey_size(cc)); 2426 else if (crypt_integrity_aead(cc)) 2427 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2428 cc->key + (i * subkey_size), 2429 subkey_size); 2430 else 2431 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 2432 cc->key + (i * subkey_size), 2433 subkey_size); 2434 if (r) 2435 err = r; 2436 } 2437 2438 if (crypt_integrity_hmac(cc)) 2439 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 2440 2441 return err; 2442 } 2443 2444 #ifdef CONFIG_KEYS 2445 2446 static bool contains_whitespace(const char *str) 2447 { 2448 while (*str) 2449 if (isspace(*str++)) 2450 return true; 2451 return false; 2452 } 2453 2454 static int set_key_user(struct crypt_config *cc, struct key *key) 2455 { 2456 const struct user_key_payload *ukp; 2457 2458 ukp = user_key_payload_locked(key); 2459 if (!ukp) 2460 return -EKEYREVOKED; 2461 2462 if (cc->key_size != ukp->datalen) 2463 return -EINVAL; 2464 2465 memcpy(cc->key, ukp->data, cc->key_size); 2466 2467 return 0; 2468 } 2469 2470 static int set_key_encrypted(struct crypt_config *cc, struct key *key) 2471 { 2472 const struct encrypted_key_payload *ekp; 2473 2474 ekp = key->payload.data[0]; 2475 if (!ekp) 2476 return -EKEYREVOKED; 2477 2478 if (cc->key_size != ekp->decrypted_datalen) 2479 return -EINVAL; 2480 2481 memcpy(cc->key, ekp->decrypted_data, cc->key_size); 2482 2483 return 0; 2484 } 2485 2486 static int set_key_trusted(struct crypt_config *cc, struct key *key) 2487 { 2488 const struct trusted_key_payload *tkp; 2489 2490 tkp = key->payload.data[0]; 2491 if (!tkp) 2492 return -EKEYREVOKED; 2493 2494 if (cc->key_size != tkp->key_len) 2495 return -EINVAL; 2496 2497 memcpy(cc->key, tkp->key, cc->key_size); 2498 2499 return 0; 2500 } 2501 2502 static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2503 { 2504 char *new_key_string, *key_desc; 2505 int ret; 2506 struct key_type *type; 2507 struct key *key; 2508 int (*set_key)(struct crypt_config *cc, struct key *key); 2509 2510 /* 2511 * Reject key_string with whitespace. dm core currently lacks code for 2512 * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 2513 */ 2514 if (contains_whitespace(key_string)) { 2515 DMERR("whitespace chars not allowed in key string"); 2516 return -EINVAL; 2517 } 2518 2519 /* look for next ':' separating key_type from key_description */ 2520 key_desc = strchr(key_string, ':'); 2521 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 2522 return -EINVAL; 2523 2524 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) { 2525 type = &key_type_logon; 2526 set_key = set_key_user; 2527 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) { 2528 type = &key_type_user; 2529 set_key = set_key_user; 2530 } else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) && 2531 !strncmp(key_string, "encrypted:", key_desc - key_string + 1)) { 2532 type = &key_type_encrypted; 2533 set_key = set_key_encrypted; 2534 } else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) && 2535 !strncmp(key_string, "trusted:", key_desc - key_string + 1)) { 2536 type = &key_type_trusted; 2537 set_key = set_key_trusted; 2538 } else { 2539 return -EINVAL; 2540 } 2541 2542 new_key_string = kstrdup(key_string, GFP_KERNEL); 2543 if (!new_key_string) 2544 return -ENOMEM; 2545 2546 key = request_key(type, key_desc + 1, NULL); 2547 if (IS_ERR(key)) { 2548 ret = PTR_ERR(key); 2549 goto free_new_key_string; 2550 } 2551 2552 down_read(&key->sem); 2553 ret = set_key(cc, key); 2554 up_read(&key->sem); 2555 key_put(key); 2556 if (ret < 0) 2557 goto free_new_key_string; 2558 2559 /* clear the flag since following operations may invalidate previously valid key */ 2560 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2561 2562 ret = crypt_setkey(cc); 2563 if (ret) 2564 goto free_new_key_string; 2565 2566 set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2567 kfree_sensitive(cc->key_string); 2568 cc->key_string = new_key_string; 2569 return 0; 2570 2571 free_new_key_string: 2572 kfree_sensitive(new_key_string); 2573 return ret; 2574 } 2575 2576 static int get_key_size(char **key_string) 2577 { 2578 char *colon, dummy; 2579 int ret; 2580 2581 if (*key_string[0] != ':') 2582 return strlen(*key_string) >> 1; 2583 2584 /* look for next ':' in key string */ 2585 colon = strpbrk(*key_string + 1, ":"); 2586 if (!colon) 2587 return -EINVAL; 2588 2589 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2590 return -EINVAL; 2591 2592 *key_string = colon; 2593 2594 /* remaining key string should be :<logon|user>:<key_desc> */ 2595 2596 return ret; 2597 } 2598 2599 #else 2600 2601 static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2602 { 2603 return -EINVAL; 2604 } 2605 2606 static int get_key_size(char **key_string) 2607 { 2608 return (*key_string[0] == ':') ? -EINVAL : (int)(strlen(*key_string) >> 1); 2609 } 2610 2611 #endif /* CONFIG_KEYS */ 2612 2613 static int crypt_set_key(struct crypt_config *cc, char *key) 2614 { 2615 int r = -EINVAL; 2616 size_t key_string_len = strlen(key); 2617 2618 /* Hyphen (which gives a key_size of zero) means there is no key. */ 2619 if (!cc->key_size && strcmp(key, "-")) 2620 goto out; 2621 2622 /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2623 if (key[0] == ':') { 2624 r = crypt_set_keyring_key(cc, key + 1); 2625 goto out; 2626 } 2627 2628 /* clear the flag since following operations may invalidate previously valid key */ 2629 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2630 2631 /* wipe references to any kernel keyring key */ 2632 kfree_sensitive(cc->key_string); 2633 cc->key_string = NULL; 2634 2635 if (cc->key_size && key_string_len != cc->key_size * 2) 2636 goto out; 2637 2638 /* Decode key from its hex representation. */ 2639 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) 2640 goto out; 2641 2642 r = crypt_setkey(cc); 2643 if (!r) 2644 set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2645 2646 out: 2647 /* Hex key string not needed after here, so wipe it. */ 2648 memzero_explicit(key, key_string_len); 2649 2650 return r; 2651 } 2652 2653 static int crypt_wipe_key(struct crypt_config *cc) 2654 { 2655 int r; 2656 2657 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2658 get_random_bytes(&cc->key, cc->key_size); 2659 2660 /* Wipe IV private keys */ 2661 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) 2662 cc->iv_gen_ops->wipe(cc); 2663 2664 kfree_sensitive(cc->key_string); 2665 cc->key_string = NULL; 2666 r = crypt_setkey(cc); 2667 memzero_explicit(cc->key, cc->key_size); 2668 2669 return r; 2670 } 2671 2672 static void crypt_calculate_pages_per_client(void) 2673 { 2674 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; 2675 2676 if (!dm_crypt_clients_n) 2677 return; 2678 2679 pages /= dm_crypt_clients_n; 2680 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) 2681 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; 2682 dm_crypt_pages_per_client = pages; 2683 } 2684 2685 static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) 2686 { 2687 struct crypt_config *cc = pool_data; 2688 struct page *page; 2689 2690 /* 2691 * Note, percpu_counter_read_positive() may over (and under) estimate 2692 * the current usage by at most (batch - 1) * num_online_cpus() pages, 2693 * but avoids potential spinlock contention of an exact result. 2694 */ 2695 if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) >= dm_crypt_pages_per_client) && 2696 likely(gfp_mask & __GFP_NORETRY)) 2697 return NULL; 2698 2699 page = alloc_page(gfp_mask); 2700 if (likely(page != NULL)) 2701 percpu_counter_add(&cc->n_allocated_pages, 1); 2702 2703 return page; 2704 } 2705 2706 static void crypt_page_free(void *page, void *pool_data) 2707 { 2708 struct crypt_config *cc = pool_data; 2709 2710 __free_page(page); 2711 percpu_counter_sub(&cc->n_allocated_pages, 1); 2712 } 2713 2714 static void crypt_dtr(struct dm_target *ti) 2715 { 2716 struct crypt_config *cc = ti->private; 2717 2718 ti->private = NULL; 2719 2720 if (!cc) 2721 return; 2722 2723 if (cc->write_thread) 2724 kthread_stop(cc->write_thread); 2725 2726 if (cc->io_queue) 2727 destroy_workqueue(cc->io_queue); 2728 if (cc->crypt_queue) 2729 destroy_workqueue(cc->crypt_queue); 2730 2731 if (cc->workqueue_id) 2732 ida_free(&workqueue_ida, cc->workqueue_id); 2733 2734 crypt_free_tfms(cc); 2735 2736 bioset_exit(&cc->bs); 2737 2738 mempool_exit(&cc->page_pool); 2739 mempool_exit(&cc->req_pool); 2740 mempool_exit(&cc->tag_pool); 2741 2742 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); 2743 percpu_counter_destroy(&cc->n_allocated_pages); 2744 2745 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 2746 cc->iv_gen_ops->dtr(cc); 2747 2748 if (cc->dev) 2749 dm_put_device(ti, cc->dev); 2750 2751 kfree_sensitive(cc->cipher_string); 2752 kfree_sensitive(cc->key_string); 2753 kfree_sensitive(cc->cipher_auth); 2754 kfree_sensitive(cc->authenc_key); 2755 2756 mutex_destroy(&cc->bio_alloc_lock); 2757 2758 /* Must zero key material before freeing */ 2759 kfree_sensitive(cc); 2760 2761 spin_lock(&dm_crypt_clients_lock); 2762 WARN_ON(!dm_crypt_clients_n); 2763 dm_crypt_clients_n--; 2764 crypt_calculate_pages_per_client(); 2765 spin_unlock(&dm_crypt_clients_lock); 2766 2767 dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1); 2768 } 2769 2770 static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 2771 { 2772 struct crypt_config *cc = ti->private; 2773 2774 if (crypt_integrity_aead(cc)) 2775 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2776 else 2777 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2778 2779 if (cc->iv_size) 2780 /* at least a 64 bit sector number should fit in our buffer */ 2781 cc->iv_size = max(cc->iv_size, 2782 (unsigned int)(sizeof(u64) / sizeof(u8))); 2783 else if (ivmode) { 2784 DMWARN("Selected cipher does not support IVs"); 2785 ivmode = NULL; 2786 } 2787 2788 /* Choose ivmode, see comments at iv code. */ 2789 if (ivmode == NULL) 2790 cc->iv_gen_ops = NULL; 2791 else if (strcmp(ivmode, "plain") == 0) 2792 cc->iv_gen_ops = &crypt_iv_plain_ops; 2793 else if (strcmp(ivmode, "plain64") == 0) 2794 cc->iv_gen_ops = &crypt_iv_plain64_ops; 2795 else if (strcmp(ivmode, "plain64be") == 0) 2796 cc->iv_gen_ops = &crypt_iv_plain64be_ops; 2797 else if (strcmp(ivmode, "essiv") == 0) 2798 cc->iv_gen_ops = &crypt_iv_essiv_ops; 2799 else if (strcmp(ivmode, "benbi") == 0) 2800 cc->iv_gen_ops = &crypt_iv_benbi_ops; 2801 else if (strcmp(ivmode, "null") == 0) 2802 cc->iv_gen_ops = &crypt_iv_null_ops; 2803 else if (strcmp(ivmode, "eboiv") == 0) 2804 cc->iv_gen_ops = &crypt_iv_eboiv_ops; 2805 else if (strcmp(ivmode, "elephant") == 0) { 2806 cc->iv_gen_ops = &crypt_iv_elephant_ops; 2807 cc->key_parts = 2; 2808 cc->key_extra_size = cc->key_size / 2; 2809 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE) 2810 return -EINVAL; 2811 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags); 2812 } else if (strcmp(ivmode, "lmk") == 0) { 2813 cc->iv_gen_ops = &crypt_iv_lmk_ops; 2814 /* 2815 * Version 2 and 3 is recognised according 2816 * to length of provided multi-key string. 2817 * If present (version 3), last key is used as IV seed. 2818 * All keys (including IV seed) are always the same size. 2819 */ 2820 if (cc->key_size % cc->key_parts) { 2821 cc->key_parts++; 2822 cc->key_extra_size = cc->key_size / cc->key_parts; 2823 } 2824 } else if (strcmp(ivmode, "tcw") == 0) { 2825 cc->iv_gen_ops = &crypt_iv_tcw_ops; 2826 cc->key_parts += 2; /* IV + whitening */ 2827 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2828 } else if (strcmp(ivmode, "random") == 0) { 2829 cc->iv_gen_ops = &crypt_iv_random_ops; 2830 /* Need storage space in integrity fields. */ 2831 cc->integrity_iv_size = cc->iv_size; 2832 } else { 2833 ti->error = "Invalid IV mode"; 2834 return -EINVAL; 2835 } 2836 2837 return 0; 2838 } 2839 2840 /* 2841 * Workaround to parse HMAC algorithm from AEAD crypto API spec. 2842 * The HMAC is needed to calculate tag size (HMAC digest size). 2843 * This should be probably done by crypto-api calls (once available...) 2844 */ 2845 static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 2846 { 2847 char *start, *end, *mac_alg = NULL; 2848 struct crypto_ahash *mac; 2849 2850 if (!strstarts(cipher_api, "authenc(")) 2851 return 0; 2852 2853 start = strchr(cipher_api, '('); 2854 end = strchr(cipher_api, ','); 2855 if (!start || !end || ++start > end) 2856 return -EINVAL; 2857 2858 mac_alg = kmemdup_nul(start, end - start, GFP_KERNEL); 2859 if (!mac_alg) 2860 return -ENOMEM; 2861 2862 mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY); 2863 kfree(mac_alg); 2864 2865 if (IS_ERR(mac)) 2866 return PTR_ERR(mac); 2867 2868 if (!test_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags)) 2869 cc->key_mac_size = crypto_ahash_digestsize(mac); 2870 crypto_free_ahash(mac); 2871 2872 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 2873 if (!cc->authenc_key) 2874 return -ENOMEM; 2875 2876 return 0; 2877 } 2878 2879 static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 2880 char **ivmode, char **ivopts) 2881 { 2882 struct crypt_config *cc = ti->private; 2883 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; 2884 int ret = -EINVAL; 2885 2886 cc->tfms_count = 1; 2887 2888 /* 2889 * New format (capi: prefix) 2890 * capi:cipher_api_spec-iv:ivopts 2891 */ 2892 tmp = &cipher_in[strlen("capi:")]; 2893 2894 /* Separate IV options if present, it can contain another '-' in hash name */ 2895 *ivopts = strrchr(tmp, ':'); 2896 if (*ivopts) { 2897 **ivopts = '\0'; 2898 (*ivopts)++; 2899 } 2900 /* Parse IV mode */ 2901 *ivmode = strrchr(tmp, '-'); 2902 if (*ivmode) { 2903 **ivmode = '\0'; 2904 (*ivmode)++; 2905 } 2906 /* The rest is crypto API spec */ 2907 cipher_api = tmp; 2908 2909 /* Alloc AEAD, can be used only in new format. */ 2910 if (crypt_integrity_aead(cc)) { 2911 ret = crypt_ctr_auth_cipher(cc, cipher_api); 2912 if (ret < 0) { 2913 ti->error = "Invalid AEAD cipher spec"; 2914 return ret; 2915 } 2916 } 2917 2918 if (*ivmode && !strcmp(*ivmode, "lmk")) { 2919 if (crypt_integrity_aead(cc)) { 2920 ti->error = "AEAD transforms not supported for LMK"; 2921 return -EINVAL; 2922 } 2923 cc->tfms_count = 64; 2924 } 2925 2926 if (*ivmode && !strcmp(*ivmode, "essiv")) { 2927 if (!*ivopts) { 2928 ti->error = "Digest algorithm missing for ESSIV mode"; 2929 return -EINVAL; 2930 } 2931 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)", 2932 cipher_api, *ivopts); 2933 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 2934 ti->error = "Cannot allocate cipher string"; 2935 return -ENOMEM; 2936 } 2937 cipher_api = buf; 2938 } 2939 2940 cc->key_parts = cc->tfms_count; 2941 2942 /* Allocate cipher */ 2943 ret = crypt_alloc_tfms(cc, cipher_api); 2944 if (ret < 0) { 2945 ti->error = "Error allocating crypto tfm"; 2946 return ret; 2947 } 2948 2949 if (crypt_integrity_aead(cc)) 2950 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2951 else 2952 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2953 2954 return 0; 2955 } 2956 2957 static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 2958 char **ivmode, char **ivopts) 2959 { 2960 struct crypt_config *cc = ti->private; 2961 char *tmp, *cipher, *chainmode, *keycount; 2962 char *cipher_api = NULL; 2963 int ret = -EINVAL; 2964 char dummy; 2965 2966 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 2967 ti->error = "Bad cipher specification"; 2968 return -EINVAL; 2969 } 2970 2971 /* 2972 * Legacy dm-crypt cipher specification 2973 * cipher[:keycount]-mode-iv:ivopts 2974 */ 2975 tmp = cipher_in; 2976 keycount = strsep(&tmp, "-"); 2977 cipher = strsep(&keycount, ":"); 2978 2979 if (!keycount) 2980 cc->tfms_count = 1; 2981 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 2982 !is_power_of_2(cc->tfms_count)) { 2983 ti->error = "Bad cipher key count specification"; 2984 return -EINVAL; 2985 } 2986 cc->key_parts = cc->tfms_count; 2987 2988 chainmode = strsep(&tmp, "-"); 2989 *ivmode = strsep(&tmp, ":"); 2990 *ivopts = tmp; 2991 2992 /* 2993 * For compatibility with the original dm-crypt mapping format, if 2994 * only the cipher name is supplied, use cbc-plain. 2995 */ 2996 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 2997 chainmode = "cbc"; 2998 *ivmode = "plain"; 2999 } 3000 3001 if (strcmp(chainmode, "ecb") && !*ivmode) { 3002 ti->error = "IV mechanism required"; 3003 return -EINVAL; 3004 } 3005 3006 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 3007 if (!cipher_api) 3008 goto bad_mem; 3009 3010 if (*ivmode && !strcmp(*ivmode, "essiv")) { 3011 if (!*ivopts) { 3012 ti->error = "Digest algorithm missing for ESSIV mode"; 3013 kfree(cipher_api); 3014 return -EINVAL; 3015 } 3016 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 3017 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts); 3018 } else { 3019 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 3020 "%s(%s)", chainmode, cipher); 3021 } 3022 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 3023 kfree(cipher_api); 3024 goto bad_mem; 3025 } 3026 3027 /* Allocate cipher */ 3028 ret = crypt_alloc_tfms(cc, cipher_api); 3029 if (ret < 0) { 3030 ti->error = "Error allocating crypto tfm"; 3031 kfree(cipher_api); 3032 return ret; 3033 } 3034 kfree(cipher_api); 3035 3036 return 0; 3037 bad_mem: 3038 ti->error = "Cannot allocate cipher strings"; 3039 return -ENOMEM; 3040 } 3041 3042 static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 3043 { 3044 struct crypt_config *cc = ti->private; 3045 char *ivmode = NULL, *ivopts = NULL; 3046 int ret; 3047 3048 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 3049 if (!cc->cipher_string) { 3050 ti->error = "Cannot allocate cipher strings"; 3051 return -ENOMEM; 3052 } 3053 3054 if (strstarts(cipher_in, "capi:")) 3055 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 3056 else 3057 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 3058 if (ret) 3059 return ret; 3060 3061 /* Initialize IV */ 3062 ret = crypt_ctr_ivmode(ti, ivmode); 3063 if (ret < 0) 3064 return ret; 3065 3066 /* Initialize and set key */ 3067 ret = crypt_set_key(cc, key); 3068 if (ret < 0) { 3069 ti->error = "Error decoding and setting key"; 3070 return ret; 3071 } 3072 3073 /* Allocate IV */ 3074 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 3075 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 3076 if (ret < 0) { 3077 ti->error = "Error creating IV"; 3078 return ret; 3079 } 3080 } 3081 3082 /* Initialize IV (set keys for ESSIV etc) */ 3083 if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 3084 ret = cc->iv_gen_ops->init(cc); 3085 if (ret < 0) { 3086 ti->error = "Error initialising IV"; 3087 return ret; 3088 } 3089 } 3090 3091 /* wipe the kernel key payload copy */ 3092 if (cc->key_string) 3093 memzero_explicit(cc->key, cc->key_size); 3094 3095 return ret; 3096 } 3097 3098 static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 3099 { 3100 struct crypt_config *cc = ti->private; 3101 struct dm_arg_set as; 3102 static const struct dm_arg _args[] = { 3103 {0, 9, "Invalid number of feature args"}, 3104 }; 3105 unsigned int opt_params, val; 3106 const char *opt_string, *sval; 3107 char dummy; 3108 int ret; 3109 3110 /* Optional parameters */ 3111 as.argc = argc; 3112 as.argv = argv; 3113 3114 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 3115 if (ret) 3116 return ret; 3117 3118 while (opt_params--) { 3119 opt_string = dm_shift_arg(&as); 3120 if (!opt_string) { 3121 ti->error = "Not enough feature arguments"; 3122 return -EINVAL; 3123 } 3124 3125 if (!strcasecmp(opt_string, "allow_discards")) 3126 ti->num_discard_bios = 1; 3127 3128 else if (!strcasecmp(opt_string, "same_cpu_crypt")) 3129 set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 3130 else if (!strcasecmp(opt_string, "high_priority")) 3131 set_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags); 3132 3133 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 3134 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 3135 else if (!strcasecmp(opt_string, "no_read_workqueue")) 3136 set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 3137 else if (!strcasecmp(opt_string, "no_write_workqueue")) 3138 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3139 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 3140 if (val == 0 || val > MAX_TAG_SIZE) { 3141 ti->error = "Invalid integrity arguments"; 3142 return -EINVAL; 3143 } 3144 cc->used_tag_size = val; 3145 sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 3146 if (!strcasecmp(sval, "aead")) { 3147 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 3148 } else if (strcasecmp(sval, "none")) { 3149 ti->error = "Unknown integrity profile"; 3150 return -EINVAL; 3151 } 3152 3153 cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 3154 if (!cc->cipher_auth) 3155 return -ENOMEM; 3156 } else if (sscanf(opt_string, "integrity_key_size:%u%c", &val, &dummy) == 1) { 3157 if (!val) { 3158 ti->error = "Invalid integrity_key_size argument"; 3159 return -EINVAL; 3160 } 3161 cc->key_mac_size = val; 3162 set_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags); 3163 } else if (sscanf(opt_string, "sector_size:%u%c", &cc->sector_size, &dummy) == 1) { 3164 if (cc->sector_size < (1 << SECTOR_SHIFT) || 3165 cc->sector_size > DM_CRYPT_MAX_SECTOR_SIZE || 3166 (cc->sector_size & (cc->sector_size - 1))) { 3167 ti->error = "Invalid feature value for sector_size"; 3168 return -EINVAL; 3169 } 3170 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { 3171 ti->error = "Device size is not multiple of sector_size feature"; 3172 return -EINVAL; 3173 } 3174 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; 3175 } else if (!strcasecmp(opt_string, "iv_large_sectors")) 3176 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3177 else { 3178 ti->error = "Invalid feature arguments"; 3179 return -EINVAL; 3180 } 3181 } 3182 3183 return 0; 3184 } 3185 3186 #ifdef CONFIG_BLK_DEV_ZONED 3187 static int crypt_report_zones(struct dm_target *ti, 3188 struct dm_report_zones_args *args, unsigned int nr_zones) 3189 { 3190 struct crypt_config *cc = ti->private; 3191 3192 return dm_report_zones(cc->dev->bdev, cc->start, 3193 cc->start + dm_target_offset(ti, args->next_sector), 3194 args, nr_zones); 3195 } 3196 #else 3197 #define crypt_report_zones NULL 3198 #endif 3199 3200 /* 3201 * Construct an encryption mapping: 3202 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 3203 */ 3204 static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 3205 { 3206 struct crypt_config *cc; 3207 const char *devname = dm_table_device_name(ti->table); 3208 int key_size, wq_id; 3209 unsigned int align_mask; 3210 unsigned int common_wq_flags; 3211 unsigned long long tmpll; 3212 int ret; 3213 size_t iv_size_padding, additional_req_size; 3214 char dummy; 3215 3216 if (argc < 5) { 3217 ti->error = "Not enough arguments"; 3218 return -EINVAL; 3219 } 3220 3221 key_size = get_key_size(&argv[1]); 3222 if (key_size < 0) { 3223 ti->error = "Cannot parse key size"; 3224 return -EINVAL; 3225 } 3226 3227 cc = kzalloc_flex(*cc, key, key_size); 3228 if (!cc) { 3229 ti->error = "Cannot allocate encryption context"; 3230 return -ENOMEM; 3231 } 3232 cc->key_size = key_size; 3233 cc->sector_size = (1 << SECTOR_SHIFT); 3234 cc->sector_shift = 0; 3235 3236 ti->private = cc; 3237 3238 spin_lock(&dm_crypt_clients_lock); 3239 dm_crypt_clients_n++; 3240 crypt_calculate_pages_per_client(); 3241 spin_unlock(&dm_crypt_clients_lock); 3242 3243 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); 3244 if (ret < 0) 3245 goto bad; 3246 3247 /* Optional parameters need to be read before cipher constructor */ 3248 if (argc > 5) { 3249 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 3250 if (ret) 3251 goto bad; 3252 } 3253 3254 ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 3255 if (ret < 0) 3256 goto bad; 3257 3258 if (crypt_integrity_aead(cc)) { 3259 cc->dmreq_start = sizeof(struct aead_request); 3260 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 3261 align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 3262 } else { 3263 cc->dmreq_start = sizeof(struct skcipher_request); 3264 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 3265 align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 3266 } 3267 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 3268 3269 if (align_mask < CRYPTO_MINALIGN) { 3270 /* Allocate the padding exactly */ 3271 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 3272 & align_mask; 3273 } else { 3274 /* 3275 * If the cipher requires greater alignment than kmalloc 3276 * alignment, we don't know the exact position of the 3277 * initialization vector. We must assume worst case. 3278 */ 3279 iv_size_padding = align_mask; 3280 } 3281 3282 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 3283 additional_req_size = sizeof(struct dm_crypt_request) + 3284 iv_size_padding + cc->iv_size + 3285 cc->iv_size + 3286 sizeof(uint64_t) + 3287 sizeof(unsigned int); 3288 3289 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); 3290 if (ret) { 3291 ti->error = "Cannot allocate crypt request mempool"; 3292 goto bad; 3293 } 3294 3295 cc->per_bio_data_size = ti->per_io_data_size = 3296 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 3297 ARCH_DMA_MINALIGN); 3298 3299 ret = mempool_init(&cc->page_pool, BIO_MAX_VECS, crypt_page_alloc, crypt_page_free, cc); 3300 if (ret) { 3301 ti->error = "Cannot allocate page mempool"; 3302 goto bad; 3303 } 3304 3305 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); 3306 if (ret) { 3307 ti->error = "Cannot allocate crypt bioset"; 3308 goto bad; 3309 } 3310 3311 mutex_init(&cc->bio_alloc_lock); 3312 3313 ret = -EINVAL; 3314 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || 3315 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { 3316 ti->error = "Invalid iv_offset sector"; 3317 goto bad; 3318 } 3319 cc->iv_offset = tmpll; 3320 3321 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 3322 if (ret) { 3323 ti->error = "Device lookup failed"; 3324 goto bad; 3325 } 3326 3327 ret = -EINVAL; 3328 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { 3329 ti->error = "Invalid device sector"; 3330 goto bad; 3331 } 3332 cc->start = tmpll; 3333 3334 if (bdev_is_zoned(cc->dev->bdev)) { 3335 /* 3336 * For zoned block devices, we need to preserve the issuer write 3337 * ordering. To do so, disable write workqueues and force inline 3338 * encryption completion. 3339 */ 3340 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3341 set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags); 3342 3343 /* 3344 * All zone append writes to a zone of a zoned block device will 3345 * have the same BIO sector, the start of the zone. When the 3346 * cypher IV mode uses sector values, all data targeting a 3347 * zone will be encrypted using the first sector numbers of the 3348 * zone. This will not result in write errors but will 3349 * cause most reads to fail as reads will use the sector values 3350 * for the actual data locations, resulting in IV mismatch. 3351 * To avoid this problem, ask DM core to emulate zone append 3352 * operations with regular writes. 3353 */ 3354 DMDEBUG("Zone append operations will be emulated"); 3355 ti->emulate_zone_append = true; 3356 } 3357 3358 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 3359 ret = crypt_integrity_ctr(cc, ti); 3360 if (ret) 3361 goto bad; 3362 3363 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->tuple_size; 3364 if (!cc->tag_pool_max_sectors) 3365 cc->tag_pool_max_sectors = 1; 3366 3367 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, 3368 cc->tag_pool_max_sectors * cc->tuple_size); 3369 if (ret) { 3370 ti->error = "Cannot allocate integrity tags mempool"; 3371 goto bad; 3372 } 3373 3374 cc->tag_pool_max_sectors <<= cc->sector_shift; 3375 } 3376 3377 wq_id = ida_alloc_min(&workqueue_ida, 1, GFP_KERNEL); 3378 if (wq_id < 0) { 3379 ti->error = "Couldn't get workqueue id"; 3380 ret = wq_id; 3381 goto bad; 3382 } 3383 cc->workqueue_id = wq_id; 3384 3385 ret = -ENOMEM; 3386 common_wq_flags = WQ_MEM_RECLAIM | WQ_SYSFS; 3387 if (test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags)) 3388 common_wq_flags |= WQ_HIGHPRI; 3389 3390 cc->io_queue = alloc_workqueue("kcryptd_io-%s-%d", 3391 common_wq_flags | WQ_PERCPU, 1, 3392 devname, wq_id); 3393 if (!cc->io_queue) { 3394 ti->error = "Couldn't create kcryptd io queue"; 3395 goto bad; 3396 } 3397 3398 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) { 3399 cc->crypt_queue = alloc_workqueue("kcryptd-%s-%d", 3400 common_wq_flags | WQ_CPU_INTENSIVE | WQ_PERCPU, 3401 1, devname, wq_id); 3402 } else { 3403 /* 3404 * While crypt_queue is certainly CPU intensive, the use of 3405 * WQ_CPU_INTENSIVE is meaningless with WQ_UNBOUND. 3406 */ 3407 cc->crypt_queue = alloc_workqueue("kcryptd-%s-%d", 3408 common_wq_flags | WQ_UNBOUND, 3409 num_online_cpus(), devname, wq_id); 3410 } 3411 if (!cc->crypt_queue) { 3412 ti->error = "Couldn't create kcryptd queue"; 3413 goto bad; 3414 } 3415 3416 spin_lock_init(&cc->write_thread_lock); 3417 cc->write_tree = RB_ROOT; 3418 3419 cc->write_thread = kthread_run(dmcrypt_write, cc, "dmcrypt_write/%s", devname); 3420 if (IS_ERR(cc->write_thread)) { 3421 ret = PTR_ERR(cc->write_thread); 3422 cc->write_thread = NULL; 3423 ti->error = "Couldn't spawn write thread"; 3424 goto bad; 3425 } 3426 if (test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags)) 3427 set_user_nice(cc->write_thread, MIN_NICE); 3428 3429 ti->num_flush_bios = 1; 3430 ti->limit_swap_bios = true; 3431 ti->accounts_remapped_io = true; 3432 3433 dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1); 3434 return 0; 3435 3436 bad: 3437 dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0); 3438 crypt_dtr(ti); 3439 return ret; 3440 } 3441 3442 static int crypt_map(struct dm_target *ti, struct bio *bio) 3443 { 3444 struct dm_crypt_io *io; 3445 struct crypt_config *cc = ti->private; 3446 unsigned max_sectors; 3447 bool no_split; 3448 3449 /* 3450 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 3451 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 3452 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 3453 */ 3454 if (unlikely(bio->bi_opf & REQ_PREFLUSH || 3455 bio_op(bio) == REQ_OP_DISCARD)) { 3456 bio_set_dev(bio, cc->dev->bdev); 3457 if (bio_sectors(bio)) 3458 bio->bi_iter.bi_sector = cc->start + 3459 dm_target_offset(ti, bio->bi_iter.bi_sector); 3460 return DM_MAPIO_REMAPPED; 3461 } 3462 3463 /* 3464 * Check if bio is too large, split as needed. 3465 * 3466 * For zoned devices, splitting write operations creates the 3467 * risk of deadlocking queue freeze operations with zone write 3468 * plugging BIO work when the reminder of a split BIO is 3469 * issued. So always allow the entire BIO to proceed. 3470 */ 3471 no_split = (ti->emulate_zone_append && op_is_write(bio_op(bio))) || 3472 (bio->bi_opf & REQ_ATOMIC); 3473 max_sectors = get_max_request_sectors(ti, bio, no_split); 3474 if (unlikely(bio_sectors(bio) > max_sectors)) { 3475 if (unlikely(no_split)) 3476 return DM_MAPIO_KILL; 3477 dm_accept_partial_bio(bio, max_sectors); 3478 } 3479 3480 /* 3481 * Ensure that bio is a multiple of internal sector encryption size 3482 * and is aligned to this size as defined in IO hints. 3483 */ 3484 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) 3485 return DM_MAPIO_KILL; 3486 3487 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) 3488 return DM_MAPIO_KILL; 3489 3490 io = dm_per_bio_data(bio, cc->per_bio_data_size); 3491 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 3492 3493 if (cc->tuple_size) { 3494 unsigned int tag_len = cc->tuple_size * (bio_sectors(bio) >> cc->sector_shift); 3495 3496 if (unlikely(tag_len > KMALLOC_MAX_SIZE)) 3497 io->integrity_metadata = NULL; 3498 else 3499 io->integrity_metadata = kmalloc(tag_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); 3500 3501 if (unlikely(!io->integrity_metadata)) { 3502 if (bio_sectors(bio) > cc->tag_pool_max_sectors) 3503 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 3504 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); 3505 io->integrity_metadata_from_pool = true; 3506 } 3507 } 3508 3509 if (crypt_integrity_aead(cc)) 3510 io->ctx.r.req_aead = (struct aead_request *)(io + 1); 3511 else 3512 io->ctx.r.req = (struct skcipher_request *)(io + 1); 3513 3514 if (bio_data_dir(io->base_bio) == READ) { 3515 if (kcryptd_io_read(io, CRYPT_MAP_READ_GFP)) 3516 kcryptd_queue_read(io); 3517 } else 3518 kcryptd_queue_crypt(io); 3519 3520 return DM_MAPIO_SUBMITTED; 3521 } 3522 3523 static char hex2asc(unsigned char c) 3524 { 3525 return c + '0' + ((unsigned int)(9 - c) >> 4 & 0x27); 3526 } 3527 3528 static void crypt_status(struct dm_target *ti, status_type_t type, 3529 unsigned int status_flags, char *result, unsigned int maxlen) 3530 { 3531 struct crypt_config *cc = ti->private; 3532 unsigned int i, sz = 0; 3533 int num_feature_args = 0; 3534 3535 switch (type) { 3536 case STATUSTYPE_INFO: 3537 result[0] = '\0'; 3538 break; 3539 3540 case STATUSTYPE_TABLE: 3541 DMEMIT("%s ", cc->cipher_string); 3542 3543 if (cc->key_size > 0) { 3544 if (cc->key_string) 3545 DMEMIT(":%u:%s", cc->key_size, cc->key_string); 3546 else { 3547 for (i = 0; i < cc->key_size; i++) { 3548 DMEMIT("%c%c", hex2asc(cc->key[i] >> 4), 3549 hex2asc(cc->key[i] & 0xf)); 3550 } 3551 } 3552 } else 3553 DMEMIT("-"); 3554 3555 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 3556 cc->dev->name, (unsigned long long)cc->start); 3557 3558 num_feature_args += !!ti->num_discard_bios; 3559 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 3560 num_feature_args += test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags); 3561 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 3562 num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 3563 num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3564 num_feature_args += !!cc->used_tag_size; 3565 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); 3566 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3567 num_feature_args += test_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags); 3568 if (num_feature_args) { 3569 DMEMIT(" %d", num_feature_args); 3570 if (ti->num_discard_bios) 3571 DMEMIT(" allow_discards"); 3572 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 3573 DMEMIT(" same_cpu_crypt"); 3574 if (test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags)) 3575 DMEMIT(" high_priority"); 3576 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 3577 DMEMIT(" submit_from_crypt_cpus"); 3578 if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) 3579 DMEMIT(" no_read_workqueue"); 3580 if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) 3581 DMEMIT(" no_write_workqueue"); 3582 if (cc->used_tag_size) 3583 DMEMIT(" integrity:%u:%s", cc->used_tag_size, cc->cipher_auth); 3584 if (cc->sector_size != (1 << SECTOR_SHIFT)) 3585 DMEMIT(" sector_size:%u", cc->sector_size); 3586 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 3587 DMEMIT(" iv_large_sectors"); 3588 if (test_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags)) 3589 DMEMIT(" integrity_key_size:%u", cc->key_mac_size); 3590 } 3591 break; 3592 3593 case STATUSTYPE_IMA: 3594 DMEMIT_TARGET_NAME_VERSION(ti->type); 3595 DMEMIT(",allow_discards=%c", ti->num_discard_bios ? 'y' : 'n'); 3596 DMEMIT(",same_cpu_crypt=%c", test_bit(DM_CRYPT_SAME_CPU, &cc->flags) ? 'y' : 'n'); 3597 DMEMIT(",high_priority=%c", test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags) ? 'y' : 'n'); 3598 DMEMIT(",submit_from_crypt_cpus=%c", test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags) ? 3599 'y' : 'n'); 3600 DMEMIT(",no_read_workqueue=%c", test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags) ? 3601 'y' : 'n'); 3602 DMEMIT(",no_write_workqueue=%c", test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags) ? 3603 'y' : 'n'); 3604 DMEMIT(",iv_large_sectors=%c", test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags) ? 3605 'y' : 'n'); 3606 3607 if (cc->used_tag_size) 3608 DMEMIT(",integrity_tag_size=%u,cipher_auth=%s", 3609 cc->used_tag_size, cc->cipher_auth); 3610 if (cc->sector_size != (1 << SECTOR_SHIFT)) 3611 DMEMIT(",sector_size=%u", cc->sector_size); 3612 if (cc->cipher_string) 3613 DMEMIT(",cipher_string=%s", cc->cipher_string); 3614 3615 DMEMIT(",key_size=%u", cc->key_size); 3616 DMEMIT(",key_parts=%u", cc->key_parts); 3617 DMEMIT(",key_extra_size=%u", cc->key_extra_size); 3618 DMEMIT(",key_mac_size=%u", cc->key_mac_size); 3619 DMEMIT(";"); 3620 break; 3621 } 3622 } 3623 3624 static void crypt_postsuspend(struct dm_target *ti) 3625 { 3626 struct crypt_config *cc = ti->private; 3627 3628 set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3629 } 3630 3631 static int crypt_preresume(struct dm_target *ti) 3632 { 3633 struct crypt_config *cc = ti->private; 3634 3635 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 3636 DMERR("aborting resume - crypt key is not set."); 3637 return -EAGAIN; 3638 } 3639 3640 return 0; 3641 } 3642 3643 static void crypt_resume(struct dm_target *ti) 3644 { 3645 struct crypt_config *cc = ti->private; 3646 3647 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3648 } 3649 3650 /* Message interface 3651 * key set <key> 3652 * key wipe 3653 */ 3654 static int crypt_message(struct dm_target *ti, unsigned int argc, char **argv, 3655 char *result, unsigned int maxlen) 3656 { 3657 struct crypt_config *cc = ti->private; 3658 int key_size, ret = -EINVAL; 3659 3660 if (argc < 2) 3661 goto error; 3662 3663 if (!strcasecmp(argv[0], "key")) { 3664 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 3665 DMWARN("not suspended during key manipulation."); 3666 return -EINVAL; 3667 } 3668 if (argc == 3 && !strcasecmp(argv[1], "set")) { 3669 /* The key size may not be changed. */ 3670 key_size = get_key_size(&argv[2]); 3671 if (key_size < 0 || cc->key_size != key_size) { 3672 memzero_explicit(argv[2], strlen(argv[2])); 3673 return -EINVAL; 3674 } 3675 3676 ret = crypt_set_key(cc, argv[2]); 3677 if (ret) 3678 return ret; 3679 if (cc->iv_gen_ops && cc->iv_gen_ops->init) 3680 ret = cc->iv_gen_ops->init(cc); 3681 /* wipe the kernel key payload copy */ 3682 if (cc->key_string) 3683 memzero_explicit(cc->key, cc->key_size); 3684 return ret; 3685 } 3686 if (argc == 2 && !strcasecmp(argv[1], "wipe")) 3687 return crypt_wipe_key(cc); 3688 } 3689 3690 error: 3691 DMWARN("unrecognised message received."); 3692 return -EINVAL; 3693 } 3694 3695 static int crypt_iterate_devices(struct dm_target *ti, 3696 iterate_devices_callout_fn fn, void *data) 3697 { 3698 struct crypt_config *cc = ti->private; 3699 3700 return fn(ti, cc->dev, cc->start, ti->len, data); 3701 } 3702 3703 static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 3704 { 3705 struct crypt_config *cc = ti->private; 3706 3707 dm_stack_bs_limits(limits, cc->sector_size); 3708 limits->dma_alignment = limits->logical_block_size - 1; 3709 3710 /* 3711 * For zoned dm-crypt targets, there will be no internal splitting of 3712 * write BIOs to avoid exceeding BIO_MAX_VECS vectors per BIO. But 3713 * without respecting this limit, crypt_alloc_buffer() will trigger a 3714 * BUG(). Avoid this by forcing DM core to split write BIOs to this 3715 * limit. 3716 */ 3717 if (ti->emulate_zone_append) 3718 limits->max_hw_sectors = min(limits->max_hw_sectors, 3719 BIO_MAX_VECS << PAGE_SECTORS_SHIFT); 3720 3721 limits->atomic_write_hw_unit_max = min(limits->atomic_write_hw_unit_max, 3722 BIO_MAX_VECS << PAGE_SHIFT); 3723 limits->atomic_write_hw_max = min(limits->atomic_write_hw_max, 3724 BIO_MAX_VECS << PAGE_SHIFT); 3725 } 3726 3727 static struct target_type crypt_target = { 3728 .name = "crypt", 3729 .version = {1, 30, 0}, 3730 .module = THIS_MODULE, 3731 .ctr = crypt_ctr, 3732 .dtr = crypt_dtr, 3733 .features = DM_TARGET_ZONED_HM | DM_TARGET_ATOMIC_WRITES, 3734 .report_zones = crypt_report_zones, 3735 .map = crypt_map, 3736 .status = crypt_status, 3737 .postsuspend = crypt_postsuspend, 3738 .preresume = crypt_preresume, 3739 .resume = crypt_resume, 3740 .message = crypt_message, 3741 .iterate_devices = crypt_iterate_devices, 3742 .io_hints = crypt_io_hints, 3743 }; 3744 module_dm(crypt); 3745 3746 MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 3747 MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 3748 MODULE_LICENSE("GPL"); 3749