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/init.h> 15 #include <linux/kernel.h> 16 #include <linux/key.h> 17 #include <linux/bio.h> 18 #include <linux/blkdev.h> 19 #include <linux/blk-integrity.h> 20 #include <linux/crc32.h> 21 #include <linux/mempool.h> 22 #include <linux/slab.h> 23 #include <linux/crypto.h> 24 #include <linux/fips.h> 25 #include <linux/workqueue.h> 26 #include <linux/kthread.h> 27 #include <linux/backing-dev.h> 28 #include <linux/atomic.h> 29 #include <linux/scatterlist.h> 30 #include <linux/rbtree.h> 31 #include <linux/ctype.h> 32 #include <asm/page.h> 33 #include <linux/unaligned.h> 34 #include <crypto/hash.h> 35 #include <crypto/md5.h> 36 #include <crypto/skcipher.h> 37 #include <crypto/aead.h> 38 #include <crypto/authenc.h> 39 #include <crypto/utils.h> 40 #include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */ 41 #include <linux/key-type.h> 42 #include <keys/user-type.h> 43 #include <keys/encrypted-type.h> 44 #include <keys/trusted-type.h> 45 46 #include <linux/device-mapper.h> 47 48 #include "dm-audit.h" 49 50 #define DM_MSG_PREFIX "crypt" 51 52 static DEFINE_IDA(workqueue_ida); 53 54 /* 55 * context holding the current state of a multi-part conversion 56 */ 57 struct convert_context { 58 struct completion restart; 59 struct bio *bio_in; 60 struct bvec_iter iter_in; 61 struct bio *bio_out; 62 struct bvec_iter iter_out; 63 atomic_t cc_pending; 64 unsigned int tag_offset; 65 u64 cc_sector; 66 union { 67 struct skcipher_request *req; 68 struct aead_request *req_aead; 69 } r; 70 bool aead_recheck; 71 bool aead_failed; 72 73 }; 74 75 /* 76 * per bio private data 77 */ 78 struct dm_crypt_io { 79 struct crypt_config *cc; 80 struct bio *base_bio; 81 u8 *integrity_metadata; 82 bool integrity_metadata_from_pool:1; 83 84 struct work_struct work; 85 86 struct convert_context ctx; 87 88 atomic_t io_pending; 89 blk_status_t error; 90 sector_t sector; 91 92 struct bvec_iter saved_bi_iter; 93 94 struct rb_node rb_node; 95 } CRYPTO_MINALIGN_ATTR; 96 97 struct dm_crypt_request { 98 struct convert_context *ctx; 99 struct scatterlist sg_in[4]; 100 struct scatterlist sg_out[4]; 101 u64 iv_sector; 102 }; 103 104 struct crypt_config; 105 106 struct crypt_iv_operations { 107 int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 108 const char *opts); 109 void (*dtr)(struct crypt_config *cc); 110 int (*init)(struct crypt_config *cc); 111 int (*wipe)(struct crypt_config *cc); 112 int (*generator)(struct crypt_config *cc, u8 *iv, 113 struct dm_crypt_request *dmreq); 114 int (*post)(struct crypt_config *cc, u8 *iv, 115 struct dm_crypt_request *dmreq); 116 }; 117 118 struct iv_benbi_private { 119 int shift; 120 }; 121 122 #define LMK_SEED_SIZE 64 /* hash + 0 */ 123 struct iv_lmk_private { 124 u8 *seed; 125 }; 126 127 #define TCW_WHITENING_SIZE 16 128 struct iv_tcw_private { 129 u8 *iv_seed; 130 u8 *whitening; 131 }; 132 133 #define ELEPHANT_MAX_KEY_SIZE 32 134 struct iv_elephant_private { 135 struct crypto_skcipher *tfm; 136 }; 137 138 /* 139 * Crypt: maps a linear range of a block device 140 * and encrypts / decrypts at the same time. 141 */ 142 enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 143 DM_CRYPT_SAME_CPU, DM_CRYPT_HIGH_PRIORITY, 144 DM_CRYPT_NO_OFFLOAD, DM_CRYPT_NO_READ_WORKQUEUE, 145 DM_CRYPT_NO_WRITE_WORKQUEUE, DM_CRYPT_WRITE_INLINE }; 146 147 enum cipher_flags { 148 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */ 149 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ 150 CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ 151 CRYPT_KEY_MAC_SIZE_SET, /* The integrity_key_size option was used */ 152 }; 153 154 /* 155 * The fields in here must be read only after initialization. 156 */ 157 struct crypt_config { 158 struct dm_dev *dev; 159 sector_t start; 160 161 struct percpu_counter n_allocated_pages; 162 163 struct workqueue_struct *io_queue; 164 struct workqueue_struct *crypt_queue; 165 166 spinlock_t write_thread_lock; 167 struct task_struct *write_thread; 168 struct rb_root write_tree; 169 170 char *cipher_string; 171 char *cipher_auth; 172 char *key_string; 173 174 const struct crypt_iv_operations *iv_gen_ops; 175 union { 176 struct iv_benbi_private benbi; 177 struct iv_lmk_private lmk; 178 struct iv_tcw_private tcw; 179 struct iv_elephant_private elephant; 180 } iv_gen_private; 181 u64 iv_offset; 182 unsigned int iv_size; 183 unsigned short sector_size; 184 unsigned char sector_shift; 185 186 union { 187 struct crypto_skcipher **tfms; 188 struct crypto_aead **tfms_aead; 189 } cipher_tfm; 190 unsigned int tfms_count; 191 int workqueue_id; 192 unsigned long cipher_flags; 193 194 /* 195 * Layout of each crypto request: 196 * 197 * struct skcipher_request 198 * context 199 * padding 200 * struct dm_crypt_request 201 * padding 202 * IV 203 * 204 * The padding is added so that dm_crypt_request and the IV are 205 * correctly aligned. 206 */ 207 unsigned int dmreq_start; 208 209 unsigned int per_bio_data_size; 210 211 unsigned long flags; 212 unsigned int key_size; 213 unsigned int key_parts; /* independent parts in key buffer */ 214 unsigned int key_extra_size; /* additional keys length */ 215 unsigned int key_mac_size; /* MAC key size for authenc(...) */ 216 217 unsigned int integrity_tag_size; 218 unsigned int integrity_iv_size; 219 unsigned int used_tag_size; 220 unsigned int tuple_size; 221 222 /* 223 * pool for per bio private data, crypto requests, 224 * encryption requeusts/buffer pages and integrity tags 225 */ 226 unsigned int tag_pool_max_sectors; 227 mempool_t tag_pool; 228 mempool_t req_pool; 229 mempool_t page_pool; 230 231 struct bio_set bs; 232 struct mutex bio_alloc_lock; 233 234 u8 *authenc_key; /* space for keys in authenc() format (if used) */ 235 u8 key[] __counted_by(key_size); 236 }; 237 238 #define MIN_IOS 64 239 #define MAX_TAG_SIZE 480 240 #define POOL_ENTRY_SIZE 512 241 242 static DEFINE_SPINLOCK(dm_crypt_clients_lock); 243 static unsigned int dm_crypt_clients_n; 244 static volatile unsigned long dm_crypt_pages_per_client; 245 #define DM_CRYPT_MEMORY_PERCENT 2 246 #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_VECS * 16) 247 #define DM_CRYPT_DEFAULT_MAX_READ_SIZE 131072 248 #define DM_CRYPT_DEFAULT_MAX_WRITE_SIZE 131072 249 250 static unsigned int max_read_size = 0; 251 module_param(max_read_size, uint, 0644); 252 MODULE_PARM_DESC(max_read_size, "Maximum size of a read request"); 253 static unsigned int max_write_size = 0; 254 module_param(max_write_size, uint, 0644); 255 MODULE_PARM_DESC(max_write_size, "Maximum size of a write request"); 256 257 static unsigned get_max_request_sectors(struct dm_target *ti, struct bio *bio) 258 { 259 struct crypt_config *cc = ti->private; 260 unsigned val, sector_align; 261 bool wrt = op_is_write(bio_op(bio)); 262 263 if (wrt) { 264 /* 265 * For zoned devices, splitting write operations creates the 266 * risk of deadlocking queue freeze operations with zone write 267 * plugging BIO work when the reminder of a split BIO is 268 * issued. So always allow the entire BIO to proceed. 269 */ 270 if (ti->emulate_zone_append) 271 return bio_sectors(bio); 272 273 val = min_not_zero(READ_ONCE(max_write_size), 274 DM_CRYPT_DEFAULT_MAX_WRITE_SIZE); 275 } else { 276 val = min_not_zero(READ_ONCE(max_read_size), 277 DM_CRYPT_DEFAULT_MAX_READ_SIZE); 278 } 279 280 if (wrt || cc->used_tag_size) 281 val = min(val, BIO_MAX_VECS << PAGE_SHIFT); 282 283 sector_align = max(bdev_logical_block_size(cc->dev->bdev), 284 (unsigned)cc->sector_size); 285 val = round_down(val, sector_align); 286 if (unlikely(!val)) 287 val = sector_align; 288 return val >> SECTOR_SHIFT; 289 } 290 291 static void crypt_endio(struct bio *clone); 292 static void kcryptd_queue_crypt(struct dm_crypt_io *io); 293 static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 294 struct scatterlist *sg); 295 296 static bool crypt_integrity_aead(struct crypt_config *cc); 297 298 /* 299 * Use this to access cipher attributes that are independent of the key. 300 */ 301 static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 302 { 303 return cc->cipher_tfm.tfms[0]; 304 } 305 306 static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 307 { 308 return cc->cipher_tfm.tfms_aead[0]; 309 } 310 311 /* 312 * Different IV generation algorithms: 313 * 314 * plain: the initial vector is the 32-bit little-endian version of the sector 315 * number, padded with zeros if necessary. 316 * 317 * plain64: the initial vector is the 64-bit little-endian version of the sector 318 * number, padded with zeros if necessary. 319 * 320 * plain64be: the initial vector is the 64-bit big-endian version of the sector 321 * number, padded with zeros if necessary. 322 * 323 * essiv: "encrypted sector|salt initial vector", the sector number is 324 * encrypted with the bulk cipher using a salt as key. The salt 325 * should be derived from the bulk cipher's key via hashing. 326 * 327 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 328 * (needed for LRW-32-AES and possible other narrow block modes) 329 * 330 * null: the initial vector is always zero. Provides compatibility with 331 * obsolete loop_fish2 devices. Do not use for new devices. 332 * 333 * lmk: Compatible implementation of the block chaining mode used 334 * by the Loop-AES block device encryption system 335 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 336 * It operates on full 512 byte sectors and uses CBC 337 * with an IV derived from the sector number, the data and 338 * optionally extra IV seed. 339 * This means that after decryption the first block 340 * of sector must be tweaked according to decrypted data. 341 * Loop-AES can use three encryption schemes: 342 * version 1: is plain aes-cbc mode 343 * version 2: uses 64 multikey scheme with lmk IV generator 344 * version 3: the same as version 2 with additional IV seed 345 * (it uses 65 keys, last key is used as IV seed) 346 * 347 * tcw: Compatible implementation of the block chaining mode used 348 * by the TrueCrypt device encryption system (prior to version 4.1). 349 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 350 * It operates on full 512 byte sectors and uses CBC 351 * with an IV derived from initial key and the sector number. 352 * In addition, whitening value is applied on every sector, whitening 353 * is calculated from initial key, sector number and mixed using CRC32. 354 * Note that this encryption scheme is vulnerable to watermarking attacks 355 * and should be used for old compatible containers access only. 356 * 357 * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) 358 * The IV is encrypted little-endian byte-offset (with the same key 359 * and cipher as the volume). 360 * 361 * elephant: The extended version of eboiv with additional Elephant diffuser 362 * used with Bitlocker CBC mode. 363 * This mode was used in older Windows systems 364 * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf 365 */ 366 367 static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 368 struct dm_crypt_request *dmreq) 369 { 370 memset(iv, 0, cc->iv_size); 371 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 372 373 return 0; 374 } 375 376 static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 377 struct dm_crypt_request *dmreq) 378 { 379 memset(iv, 0, cc->iv_size); 380 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 381 382 return 0; 383 } 384 385 static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, 386 struct dm_crypt_request *dmreq) 387 { 388 memset(iv, 0, cc->iv_size); 389 /* iv_size is at least of size u64; usually it is 16 bytes */ 390 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); 391 392 return 0; 393 } 394 395 static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 396 struct dm_crypt_request *dmreq) 397 { 398 /* 399 * ESSIV encryption of the IV is now handled by the crypto API, 400 * so just pass the plain sector number here. 401 */ 402 memset(iv, 0, cc->iv_size); 403 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 404 405 return 0; 406 } 407 408 static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 409 const char *opts) 410 { 411 unsigned int bs; 412 int log; 413 414 if (crypt_integrity_aead(cc)) 415 bs = crypto_aead_blocksize(any_tfm_aead(cc)); 416 else 417 bs = crypto_skcipher_blocksize(any_tfm(cc)); 418 log = ilog2(bs); 419 420 /* 421 * We need to calculate how far we must shift the sector count 422 * to get the cipher block count, we use this shift in _gen. 423 */ 424 if (1 << log != bs) { 425 ti->error = "cypher blocksize is not a power of 2"; 426 return -EINVAL; 427 } 428 429 if (log > 9) { 430 ti->error = "cypher blocksize is > 512"; 431 return -EINVAL; 432 } 433 434 cc->iv_gen_private.benbi.shift = 9 - log; 435 436 return 0; 437 } 438 439 static void crypt_iv_benbi_dtr(struct crypt_config *cc) 440 { 441 } 442 443 static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 444 struct dm_crypt_request *dmreq) 445 { 446 __be64 val; 447 448 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 449 450 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 451 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 452 453 return 0; 454 } 455 456 static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 457 struct dm_crypt_request *dmreq) 458 { 459 memset(iv, 0, cc->iv_size); 460 461 return 0; 462 } 463 464 static void crypt_iv_lmk_dtr(struct crypt_config *cc) 465 { 466 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 467 468 kfree_sensitive(lmk->seed); 469 lmk->seed = NULL; 470 } 471 472 static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 473 const char *opts) 474 { 475 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 476 477 if (cc->sector_size != (1 << SECTOR_SHIFT)) { 478 ti->error = "Unsupported sector size for LMK"; 479 return -EINVAL; 480 } 481 482 if (fips_enabled) { 483 ti->error = "LMK support is disabled due to FIPS"; 484 /* ... because it uses MD5. */ 485 return -EINVAL; 486 } 487 488 /* No seed in LMK version 2 */ 489 if (cc->key_parts == cc->tfms_count) { 490 lmk->seed = NULL; 491 return 0; 492 } 493 494 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 495 if (!lmk->seed) { 496 ti->error = "Error kmallocing seed storage in LMK"; 497 return -ENOMEM; 498 } 499 500 return 0; 501 } 502 503 static int crypt_iv_lmk_init(struct crypt_config *cc) 504 { 505 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 506 int subkey_size = cc->key_size / cc->key_parts; 507 508 /* LMK seed is on the position of LMK_KEYS + 1 key */ 509 if (lmk->seed) 510 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 511 MD5_DIGEST_SIZE); 512 513 return 0; 514 } 515 516 static int crypt_iv_lmk_wipe(struct crypt_config *cc) 517 { 518 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 519 520 if (lmk->seed) 521 memset(lmk->seed, 0, LMK_SEED_SIZE); 522 523 return 0; 524 } 525 526 static void crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 527 struct dm_crypt_request *dmreq, u8 *data) 528 { 529 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 530 struct md5_ctx ctx; 531 __le32 buf[4]; 532 533 md5_init(&ctx); 534 535 if (lmk->seed) 536 md5_update(&ctx, lmk->seed, LMK_SEED_SIZE); 537 538 /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 539 md5_update(&ctx, data + 16, 16 * 31); 540 541 /* Sector is cropped to 56 bits here */ 542 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 543 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 544 buf[2] = cpu_to_le32(4024); 545 buf[3] = 0; 546 md5_update(&ctx, (u8 *)buf, sizeof(buf)); 547 548 /* No MD5 padding here */ 549 cpu_to_le32_array(ctx.state.h, ARRAY_SIZE(ctx.state.h)); 550 memcpy(iv, ctx.state.h, cc->iv_size); 551 } 552 553 static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 554 struct dm_crypt_request *dmreq) 555 { 556 struct scatterlist *sg; 557 u8 *src; 558 559 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 560 sg = crypt_get_sg_data(cc, dmreq->sg_in); 561 src = kmap_local_page(sg_page(sg)); 562 crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 563 kunmap_local(src); 564 } else 565 memset(iv, 0, cc->iv_size); 566 return 0; 567 } 568 569 static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 570 struct dm_crypt_request *dmreq) 571 { 572 struct scatterlist *sg; 573 u8 *dst; 574 575 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 576 return 0; 577 578 sg = crypt_get_sg_data(cc, dmreq->sg_out); 579 dst = kmap_local_page(sg_page(sg)); 580 crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 581 582 /* Tweak the first block of plaintext sector */ 583 crypto_xor(dst + sg->offset, iv, cc->iv_size); 584 585 kunmap_local(dst); 586 return 0; 587 } 588 589 static void crypt_iv_tcw_dtr(struct crypt_config *cc) 590 { 591 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 592 593 kfree_sensitive(tcw->iv_seed); 594 tcw->iv_seed = NULL; 595 kfree_sensitive(tcw->whitening); 596 tcw->whitening = NULL; 597 } 598 599 static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 600 const char *opts) 601 { 602 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 603 604 if (cc->sector_size != (1 << SECTOR_SHIFT)) { 605 ti->error = "Unsupported sector size for TCW"; 606 return -EINVAL; 607 } 608 609 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 610 ti->error = "Wrong key size for TCW"; 611 return -EINVAL; 612 } 613 614 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 615 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 616 if (!tcw->iv_seed || !tcw->whitening) { 617 crypt_iv_tcw_dtr(cc); 618 ti->error = "Error allocating seed storage in TCW"; 619 return -ENOMEM; 620 } 621 622 return 0; 623 } 624 625 static int crypt_iv_tcw_init(struct crypt_config *cc) 626 { 627 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 628 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 629 630 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 631 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 632 TCW_WHITENING_SIZE); 633 634 return 0; 635 } 636 637 static int crypt_iv_tcw_wipe(struct crypt_config *cc) 638 { 639 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 640 641 memset(tcw->iv_seed, 0, cc->iv_size); 642 memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 643 644 return 0; 645 } 646 647 static void crypt_iv_tcw_whitening(struct crypt_config *cc, 648 struct dm_crypt_request *dmreq, u8 *data) 649 { 650 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 651 __le64 sector = cpu_to_le64(dmreq->iv_sector); 652 u8 buf[TCW_WHITENING_SIZE]; 653 int i; 654 655 /* xor whitening with sector number */ 656 crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); 657 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); 658 659 /* calculate crc32 for every 32bit part and xor it */ 660 for (i = 0; i < 4; i++) 661 put_unaligned_le32(crc32(0, &buf[i * 4], 4), &buf[i * 4]); 662 crypto_xor(&buf[0], &buf[12], 4); 663 crypto_xor(&buf[4], &buf[8], 4); 664 665 /* apply whitening (8 bytes) to whole sector */ 666 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 667 crypto_xor(data + i * 8, buf, 8); 668 memzero_explicit(buf, sizeof(buf)); 669 } 670 671 static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 672 struct dm_crypt_request *dmreq) 673 { 674 struct scatterlist *sg; 675 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 676 __le64 sector = cpu_to_le64(dmreq->iv_sector); 677 u8 *src; 678 679 /* Remove whitening from ciphertext */ 680 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 681 sg = crypt_get_sg_data(cc, dmreq->sg_in); 682 src = kmap_local_page(sg_page(sg)); 683 crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 684 kunmap_local(src); 685 } 686 687 /* Calculate IV */ 688 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); 689 if (cc->iv_size > 8) 690 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, 691 cc->iv_size - 8); 692 693 return 0; 694 } 695 696 static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 697 struct dm_crypt_request *dmreq) 698 { 699 struct scatterlist *sg; 700 u8 *dst; 701 702 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 703 return 0; 704 705 /* Apply whitening on ciphertext */ 706 sg = crypt_get_sg_data(cc, dmreq->sg_out); 707 dst = kmap_local_page(sg_page(sg)); 708 crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 709 kunmap_local(dst); 710 711 return 0; 712 } 713 714 static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 715 struct dm_crypt_request *dmreq) 716 { 717 /* Used only for writes, there must be an additional space to store IV */ 718 get_random_bytes(iv, cc->iv_size); 719 return 0; 720 } 721 722 static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, 723 const char *opts) 724 { 725 if (crypt_integrity_aead(cc)) { 726 ti->error = "AEAD transforms not supported for EBOIV"; 727 return -EINVAL; 728 } 729 730 if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) { 731 ti->error = "Block size of EBOIV cipher does not match IV size of block cipher"; 732 return -EINVAL; 733 } 734 735 return 0; 736 } 737 738 static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, 739 struct dm_crypt_request *dmreq) 740 { 741 struct crypto_skcipher *tfm = any_tfm(cc); 742 struct skcipher_request *req; 743 struct scatterlist src, dst; 744 DECLARE_CRYPTO_WAIT(wait); 745 unsigned int reqsize; 746 int err; 747 u8 *buf; 748 749 reqsize = sizeof(*req) + crypto_skcipher_reqsize(tfm); 750 reqsize = ALIGN(reqsize, __alignof__(__le64)); 751 752 req = kmalloc(reqsize + cc->iv_size, GFP_NOIO); 753 if (!req) 754 return -ENOMEM; 755 756 skcipher_request_set_tfm(req, tfm); 757 758 buf = (u8 *)req + reqsize; 759 memset(buf, 0, cc->iv_size); 760 *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 761 762 sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size); 763 sg_init_one(&dst, iv, cc->iv_size); 764 skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf); 765 skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 766 err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 767 kfree_sensitive(req); 768 769 return err; 770 } 771 772 static void crypt_iv_elephant_dtr(struct crypt_config *cc) 773 { 774 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 775 776 crypto_free_skcipher(elephant->tfm); 777 elephant->tfm = NULL; 778 } 779 780 static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti, 781 const char *opts) 782 { 783 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 784 int r; 785 786 elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 787 CRYPTO_ALG_ALLOCATES_MEMORY); 788 if (IS_ERR(elephant->tfm)) { 789 r = PTR_ERR(elephant->tfm); 790 elephant->tfm = NULL; 791 return r; 792 } 793 794 r = crypt_iv_eboiv_ctr(cc, ti, NULL); 795 if (r) 796 crypt_iv_elephant_dtr(cc); 797 return r; 798 } 799 800 static void diffuser_disk_to_cpu(u32 *d, size_t n) 801 { 802 #ifndef __LITTLE_ENDIAN 803 int i; 804 805 for (i = 0; i < n; i++) 806 d[i] = le32_to_cpu((__le32)d[i]); 807 #endif 808 } 809 810 static void diffuser_cpu_to_disk(__le32 *d, size_t n) 811 { 812 #ifndef __LITTLE_ENDIAN 813 int i; 814 815 for (i = 0; i < n; i++) 816 d[i] = cpu_to_le32((u32)d[i]); 817 #endif 818 } 819 820 static void diffuser_a_decrypt(u32 *d, size_t n) 821 { 822 int i, i1, i2, i3; 823 824 for (i = 0; i < 5; i++) { 825 i1 = 0; 826 i2 = n - 2; 827 i3 = n - 5; 828 829 while (i1 < (n - 1)) { 830 d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 831 i1++; i2++; i3++; 832 833 if (i3 >= n) 834 i3 -= n; 835 836 d[i1] += d[i2] ^ d[i3]; 837 i1++; i2++; i3++; 838 839 if (i2 >= n) 840 i2 -= n; 841 842 d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 843 i1++; i2++; i3++; 844 845 d[i1] += d[i2] ^ d[i3]; 846 i1++; i2++; i3++; 847 } 848 } 849 } 850 851 static void diffuser_a_encrypt(u32 *d, size_t n) 852 { 853 int i, i1, i2, i3; 854 855 for (i = 0; i < 5; i++) { 856 i1 = n - 1; 857 i2 = n - 2 - 1; 858 i3 = n - 5 - 1; 859 860 while (i1 > 0) { 861 d[i1] -= d[i2] ^ d[i3]; 862 i1--; i2--; i3--; 863 864 d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 865 i1--; i2--; i3--; 866 867 if (i2 < 0) 868 i2 += n; 869 870 d[i1] -= d[i2] ^ d[i3]; 871 i1--; i2--; i3--; 872 873 if (i3 < 0) 874 i3 += n; 875 876 d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 877 i1--; i2--; i3--; 878 } 879 } 880 } 881 882 static void diffuser_b_decrypt(u32 *d, size_t n) 883 { 884 int i, i1, i2, i3; 885 886 for (i = 0; i < 3; i++) { 887 i1 = 0; 888 i2 = 2; 889 i3 = 5; 890 891 while (i1 < (n - 1)) { 892 d[i1] += d[i2] ^ d[i3]; 893 i1++; i2++; i3++; 894 895 d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 896 i1++; i2++; i3++; 897 898 if (i2 >= n) 899 i2 -= n; 900 901 d[i1] += d[i2] ^ d[i3]; 902 i1++; i2++; i3++; 903 904 if (i3 >= n) 905 i3 -= n; 906 907 d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 908 i1++; i2++; i3++; 909 } 910 } 911 } 912 913 static void diffuser_b_encrypt(u32 *d, size_t n) 914 { 915 int i, i1, i2, i3; 916 917 for (i = 0; i < 3; i++) { 918 i1 = n - 1; 919 i2 = 2 - 1; 920 i3 = 5 - 1; 921 922 while (i1 > 0) { 923 d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 924 i1--; i2--; i3--; 925 926 if (i3 < 0) 927 i3 += n; 928 929 d[i1] -= d[i2] ^ d[i3]; 930 i1--; i2--; i3--; 931 932 if (i2 < 0) 933 i2 += n; 934 935 d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 936 i1--; i2--; i3--; 937 938 d[i1] -= d[i2] ^ d[i3]; 939 i1--; i2--; i3--; 940 } 941 } 942 } 943 944 static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq) 945 { 946 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 947 u8 *es, *ks, *data, *data2, *data_offset; 948 struct skcipher_request *req; 949 struct scatterlist *sg, *sg2, src, dst; 950 DECLARE_CRYPTO_WAIT(wait); 951 int i, r; 952 953 req = skcipher_request_alloc(elephant->tfm, GFP_NOIO); 954 es = kzalloc(16, GFP_NOIO); /* Key for AES */ 955 ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */ 956 957 if (!req || !es || !ks) { 958 r = -ENOMEM; 959 goto out; 960 } 961 962 *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 963 964 /* E(Ks, e(s)) */ 965 sg_init_one(&src, es, 16); 966 sg_init_one(&dst, ks, 16); 967 skcipher_request_set_crypt(req, &src, &dst, 16, NULL); 968 skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 969 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 970 if (r) 971 goto out; 972 973 /* E(Ks, e'(s)) */ 974 es[15] = 0x80; 975 sg_init_one(&dst, &ks[16], 16); 976 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 977 if (r) 978 goto out; 979 980 sg = crypt_get_sg_data(cc, dmreq->sg_out); 981 data = kmap_local_page(sg_page(sg)); 982 data_offset = data + sg->offset; 983 984 /* Cannot modify original bio, copy to sg_out and apply Elephant to it */ 985 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 986 sg2 = crypt_get_sg_data(cc, dmreq->sg_in); 987 data2 = kmap_local_page(sg_page(sg2)); 988 memcpy(data_offset, data2 + sg2->offset, cc->sector_size); 989 kunmap_local(data2); 990 } 991 992 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 993 diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32)); 994 diffuser_b_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 995 diffuser_a_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 996 diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32)); 997 } 998 999 for (i = 0; i < (cc->sector_size / 32); i++) 1000 crypto_xor(data_offset + i * 32, ks, 32); 1001 1002 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 1003 diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32)); 1004 diffuser_a_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 1005 diffuser_b_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); 1006 diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32)); 1007 } 1008 1009 kunmap_local(data); 1010 out: 1011 kfree_sensitive(ks); 1012 kfree_sensitive(es); 1013 skcipher_request_free(req); 1014 return r; 1015 } 1016 1017 static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv, 1018 struct dm_crypt_request *dmreq) 1019 { 1020 int r; 1021 1022 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 1023 r = crypt_iv_elephant(cc, dmreq); 1024 if (r) 1025 return r; 1026 } 1027 1028 return crypt_iv_eboiv_gen(cc, iv, dmreq); 1029 } 1030 1031 static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv, 1032 struct dm_crypt_request *dmreq) 1033 { 1034 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 1035 return crypt_iv_elephant(cc, dmreq); 1036 1037 return 0; 1038 } 1039 1040 static int crypt_iv_elephant_init(struct crypt_config *cc) 1041 { 1042 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1043 int key_offset = cc->key_size - cc->key_extra_size; 1044 1045 return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size); 1046 } 1047 1048 static int crypt_iv_elephant_wipe(struct crypt_config *cc) 1049 { 1050 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1051 u8 key[ELEPHANT_MAX_KEY_SIZE]; 1052 1053 memset(key, 0, cc->key_extra_size); 1054 return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size); 1055 } 1056 1057 static const struct crypt_iv_operations crypt_iv_plain_ops = { 1058 .generator = crypt_iv_plain_gen 1059 }; 1060 1061 static const struct crypt_iv_operations crypt_iv_plain64_ops = { 1062 .generator = crypt_iv_plain64_gen 1063 }; 1064 1065 static const struct crypt_iv_operations crypt_iv_plain64be_ops = { 1066 .generator = crypt_iv_plain64be_gen 1067 }; 1068 1069 static const struct crypt_iv_operations crypt_iv_essiv_ops = { 1070 .generator = crypt_iv_essiv_gen 1071 }; 1072 1073 static const struct crypt_iv_operations crypt_iv_benbi_ops = { 1074 .ctr = crypt_iv_benbi_ctr, 1075 .dtr = crypt_iv_benbi_dtr, 1076 .generator = crypt_iv_benbi_gen 1077 }; 1078 1079 static const struct crypt_iv_operations crypt_iv_null_ops = { 1080 .generator = crypt_iv_null_gen 1081 }; 1082 1083 static const struct crypt_iv_operations crypt_iv_lmk_ops = { 1084 .ctr = crypt_iv_lmk_ctr, 1085 .dtr = crypt_iv_lmk_dtr, 1086 .init = crypt_iv_lmk_init, 1087 .wipe = crypt_iv_lmk_wipe, 1088 .generator = crypt_iv_lmk_gen, 1089 .post = crypt_iv_lmk_post 1090 }; 1091 1092 static const struct crypt_iv_operations crypt_iv_tcw_ops = { 1093 .ctr = crypt_iv_tcw_ctr, 1094 .dtr = crypt_iv_tcw_dtr, 1095 .init = crypt_iv_tcw_init, 1096 .wipe = crypt_iv_tcw_wipe, 1097 .generator = crypt_iv_tcw_gen, 1098 .post = crypt_iv_tcw_post 1099 }; 1100 1101 static const struct crypt_iv_operations crypt_iv_random_ops = { 1102 .generator = crypt_iv_random_gen 1103 }; 1104 1105 static const struct crypt_iv_operations crypt_iv_eboiv_ops = { 1106 .ctr = crypt_iv_eboiv_ctr, 1107 .generator = crypt_iv_eboiv_gen 1108 }; 1109 1110 static const struct crypt_iv_operations crypt_iv_elephant_ops = { 1111 .ctr = crypt_iv_elephant_ctr, 1112 .dtr = crypt_iv_elephant_dtr, 1113 .init = crypt_iv_elephant_init, 1114 .wipe = crypt_iv_elephant_wipe, 1115 .generator = crypt_iv_elephant_gen, 1116 .post = crypt_iv_elephant_post 1117 }; 1118 1119 /* 1120 * Integrity extensions 1121 */ 1122 static bool crypt_integrity_aead(struct crypt_config *cc) 1123 { 1124 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 1125 } 1126 1127 static bool crypt_integrity_hmac(struct crypt_config *cc) 1128 { 1129 return crypt_integrity_aead(cc) && cc->key_mac_size; 1130 } 1131 1132 /* Get sg containing data */ 1133 static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 1134 struct scatterlist *sg) 1135 { 1136 if (unlikely(crypt_integrity_aead(cc))) 1137 return &sg[2]; 1138 1139 return sg; 1140 } 1141 1142 static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 1143 { 1144 struct bio_integrity_payload *bip; 1145 unsigned int tag_len; 1146 int ret; 1147 1148 if (!bio_sectors(bio) || !io->cc->tuple_size) 1149 return 0; 1150 1151 bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 1152 if (IS_ERR(bip)) 1153 return PTR_ERR(bip); 1154 1155 tag_len = io->cc->tuple_size * (bio_sectors(bio) >> io->cc->sector_shift); 1156 1157 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; 1158 1159 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 1160 tag_len, offset_in_page(io->integrity_metadata)); 1161 if (unlikely(ret != tag_len)) 1162 return -ENOMEM; 1163 1164 return 0; 1165 } 1166 1167 static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 1168 { 1169 #ifdef CONFIG_BLK_DEV_INTEGRITY 1170 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 1171 struct mapped_device *md = dm_table_get_md(ti->table); 1172 1173 /* We require an underlying device with non-PI metadata */ 1174 if (!bi || bi->csum_type != BLK_INTEGRITY_CSUM_NONE) { 1175 ti->error = "Integrity profile not supported."; 1176 return -EINVAL; 1177 } 1178 1179 if (bi->metadata_size < cc->used_tag_size) { 1180 ti->error = "Integrity profile tag size mismatch."; 1181 return -EINVAL; 1182 } 1183 cc->tuple_size = bi->metadata_size; 1184 if (1 << bi->interval_exp != cc->sector_size) { 1185 ti->error = "Integrity profile sector size mismatch."; 1186 return -EINVAL; 1187 } 1188 1189 if (crypt_integrity_aead(cc)) { 1190 cc->integrity_tag_size = cc->used_tag_size - cc->integrity_iv_size; 1191 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), 1192 cc->integrity_tag_size, cc->integrity_iv_size); 1193 1194 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 1195 ti->error = "Integrity AEAD auth tag size is not supported."; 1196 return -EINVAL; 1197 } 1198 } else if (cc->integrity_iv_size) 1199 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), 1200 cc->integrity_iv_size); 1201 1202 if ((cc->integrity_tag_size + cc->integrity_iv_size) > cc->tuple_size) { 1203 ti->error = "Not enough space for integrity tag in the profile."; 1204 return -EINVAL; 1205 } 1206 1207 return 0; 1208 #else 1209 ti->error = "Integrity profile not supported."; 1210 return -EINVAL; 1211 #endif 1212 } 1213 1214 static void crypt_convert_init(struct crypt_config *cc, 1215 struct convert_context *ctx, 1216 struct bio *bio_out, struct bio *bio_in, 1217 sector_t sector) 1218 { 1219 ctx->bio_in = bio_in; 1220 ctx->bio_out = bio_out; 1221 if (bio_in) 1222 ctx->iter_in = bio_in->bi_iter; 1223 if (bio_out) 1224 ctx->iter_out = bio_out->bi_iter; 1225 ctx->cc_sector = sector + cc->iv_offset; 1226 ctx->tag_offset = 0; 1227 init_completion(&ctx->restart); 1228 } 1229 1230 static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 1231 void *req) 1232 { 1233 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 1234 } 1235 1236 static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 1237 { 1238 return (void *)((char *)dmreq - cc->dmreq_start); 1239 } 1240 1241 static u8 *iv_of_dmreq(struct crypt_config *cc, 1242 struct dm_crypt_request *dmreq) 1243 { 1244 if (crypt_integrity_aead(cc)) 1245 return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1246 crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 1247 else 1248 return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1249 crypto_skcipher_alignmask(any_tfm(cc)) + 1); 1250 } 1251 1252 static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1253 struct dm_crypt_request *dmreq) 1254 { 1255 return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1256 } 1257 1258 static __le64 *org_sector_of_dmreq(struct crypt_config *cc, 1259 struct dm_crypt_request *dmreq) 1260 { 1261 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1262 1263 return (__le64 *) ptr; 1264 } 1265 1266 static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1267 struct dm_crypt_request *dmreq) 1268 { 1269 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1270 cc->iv_size + sizeof(uint64_t); 1271 1272 return (unsigned int *)ptr; 1273 } 1274 1275 static void *tag_from_dmreq(struct crypt_config *cc, 1276 struct dm_crypt_request *dmreq) 1277 { 1278 struct convert_context *ctx = dmreq->ctx; 1279 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1280 1281 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1282 cc->tuple_size]; 1283 } 1284 1285 static void *iv_tag_from_dmreq(struct crypt_config *cc, 1286 struct dm_crypt_request *dmreq) 1287 { 1288 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1289 } 1290 1291 static int crypt_convert_block_aead(struct crypt_config *cc, 1292 struct convert_context *ctx, 1293 struct aead_request *req, 1294 unsigned int tag_offset) 1295 { 1296 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1297 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1298 struct dm_crypt_request *dmreq; 1299 u8 *iv, *org_iv, *tag_iv, *tag; 1300 __le64 *sector; 1301 int r = 0; 1302 1303 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 1304 1305 /* Reject unexpected unaligned bio. */ 1306 if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 1307 return -EIO; 1308 1309 dmreq = dmreq_of_req(cc, req); 1310 dmreq->iv_sector = ctx->cc_sector; 1311 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1312 dmreq->iv_sector >>= cc->sector_shift; 1313 dmreq->ctx = ctx; 1314 1315 *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1316 1317 sector = org_sector_of_dmreq(cc, dmreq); 1318 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1319 1320 iv = iv_of_dmreq(cc, dmreq); 1321 org_iv = org_iv_of_dmreq(cc, dmreq); 1322 tag = tag_from_dmreq(cc, dmreq); 1323 tag_iv = iv_tag_from_dmreq(cc, dmreq); 1324 1325 /* AEAD request: 1326 * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1327 * | (authenticated) | (auth+encryption) | | 1328 * | sector_LE | IV | sector in/out | tag in/out | 1329 */ 1330 sg_init_table(dmreq->sg_in, 4); 1331 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1332 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 1333 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1334 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1335 1336 sg_init_table(dmreq->sg_out, 4); 1337 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1338 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 1339 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1340 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 1341 1342 if (cc->iv_gen_ops) { 1343 /* For READs use IV stored in integrity metadata */ 1344 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1345 memcpy(org_iv, tag_iv, cc->iv_size); 1346 } else { 1347 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1348 if (r < 0) 1349 return r; 1350 /* Store generated IV in integrity metadata */ 1351 if (cc->integrity_iv_size) 1352 memcpy(tag_iv, org_iv, cc->iv_size); 1353 } 1354 /* Working copy of IV, to be modified in crypto API */ 1355 memcpy(iv, org_iv, cc->iv_size); 1356 } 1357 1358 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1359 if (bio_data_dir(ctx->bio_in) == WRITE) { 1360 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1361 cc->sector_size, iv); 1362 r = crypto_aead_encrypt(req); 1363 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->tuple_size) 1364 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1365 cc->tuple_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1366 } else { 1367 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1368 cc->sector_size + cc->integrity_tag_size, iv); 1369 r = crypto_aead_decrypt(req); 1370 } 1371 1372 if (r == -EBADMSG) { 1373 sector_t s = le64_to_cpu(*sector); 1374 1375 ctx->aead_failed = true; 1376 if (ctx->aead_recheck) { 1377 DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu", 1378 ctx->bio_in->bi_bdev, s); 1379 dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", 1380 ctx->bio_in, s, 0); 1381 } 1382 } 1383 1384 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1385 r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1386 1387 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 1388 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1389 1390 return r; 1391 } 1392 1393 static int crypt_convert_block_skcipher(struct crypt_config *cc, 1394 struct convert_context *ctx, 1395 struct skcipher_request *req, 1396 unsigned int tag_offset) 1397 { 1398 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1399 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1400 struct scatterlist *sg_in, *sg_out; 1401 struct dm_crypt_request *dmreq; 1402 u8 *iv, *org_iv, *tag_iv; 1403 __le64 *sector; 1404 int r = 0; 1405 1406 /* Reject unexpected unaligned bio. */ 1407 if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 1408 return -EIO; 1409 1410 dmreq = dmreq_of_req(cc, req); 1411 dmreq->iv_sector = ctx->cc_sector; 1412 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1413 dmreq->iv_sector >>= cc->sector_shift; 1414 dmreq->ctx = ctx; 1415 1416 *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1417 1418 iv = iv_of_dmreq(cc, dmreq); 1419 org_iv = org_iv_of_dmreq(cc, dmreq); 1420 tag_iv = iv_tag_from_dmreq(cc, dmreq); 1421 1422 sector = org_sector_of_dmreq(cc, dmreq); 1423 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1424 1425 /* For skcipher we use only the first sg item */ 1426 sg_in = &dmreq->sg_in[0]; 1427 sg_out = &dmreq->sg_out[0]; 1428 1429 sg_init_table(sg_in, 1); 1430 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1431 1432 sg_init_table(sg_out, 1); 1433 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1434 1435 if (cc->iv_gen_ops) { 1436 /* For READs use IV stored in integrity metadata */ 1437 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1438 memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1439 } else { 1440 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1441 if (r < 0) 1442 return r; 1443 /* Data can be already preprocessed in generator */ 1444 if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags)) 1445 sg_in = sg_out; 1446 /* Store generated IV in integrity metadata */ 1447 if (cc->integrity_iv_size) 1448 memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1449 } 1450 /* Working copy of IV, to be modified in crypto API */ 1451 memcpy(iv, org_iv, cc->iv_size); 1452 } 1453 1454 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); 1455 1456 if (bio_data_dir(ctx->bio_in) == WRITE) 1457 r = crypto_skcipher_encrypt(req); 1458 else 1459 r = crypto_skcipher_decrypt(req); 1460 1461 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1462 r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1463 1464 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 1465 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1466 1467 return r; 1468 } 1469 1470 static void kcryptd_async_done(void *async_req, int error); 1471 1472 static int crypt_alloc_req_skcipher(struct crypt_config *cc, 1473 struct convert_context *ctx) 1474 { 1475 unsigned int key_index = ctx->cc_sector & (cc->tfms_count - 1); 1476 1477 if (!ctx->r.req) { 1478 ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1479 if (!ctx->r.req) 1480 return -ENOMEM; 1481 } 1482 1483 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 1484 1485 /* 1486 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1487 * requests if driver request queue is full. 1488 */ 1489 skcipher_request_set_callback(ctx->r.req, 1490 CRYPTO_TFM_REQ_MAY_BACKLOG, 1491 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1492 1493 return 0; 1494 } 1495 1496 static int crypt_alloc_req_aead(struct crypt_config *cc, 1497 struct convert_context *ctx) 1498 { 1499 if (!ctx->r.req_aead) { 1500 ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1501 if (!ctx->r.req_aead) 1502 return -ENOMEM; 1503 } 1504 1505 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1506 1507 /* 1508 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1509 * requests if driver request queue is full. 1510 */ 1511 aead_request_set_callback(ctx->r.req_aead, 1512 CRYPTO_TFM_REQ_MAY_BACKLOG, 1513 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1514 1515 return 0; 1516 } 1517 1518 static int crypt_alloc_req(struct crypt_config *cc, 1519 struct convert_context *ctx) 1520 { 1521 if (crypt_integrity_aead(cc)) 1522 return crypt_alloc_req_aead(cc, ctx); 1523 else 1524 return crypt_alloc_req_skcipher(cc, ctx); 1525 } 1526 1527 static void crypt_free_req_skcipher(struct crypt_config *cc, 1528 struct skcipher_request *req, struct bio *base_bio) 1529 { 1530 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1531 1532 if ((struct skcipher_request *)(io + 1) != req) 1533 mempool_free(req, &cc->req_pool); 1534 } 1535 1536 static void crypt_free_req_aead(struct crypt_config *cc, 1537 struct aead_request *req, struct bio *base_bio) 1538 { 1539 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1540 1541 if ((struct aead_request *)(io + 1) != req) 1542 mempool_free(req, &cc->req_pool); 1543 } 1544 1545 static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1546 { 1547 if (crypt_integrity_aead(cc)) 1548 crypt_free_req_aead(cc, req, base_bio); 1549 else 1550 crypt_free_req_skcipher(cc, req, base_bio); 1551 } 1552 1553 /* 1554 * Encrypt / decrypt data from one bio to another one (can be the same one) 1555 */ 1556 static blk_status_t crypt_convert(struct crypt_config *cc, 1557 struct convert_context *ctx, bool atomic, bool reset_pending) 1558 { 1559 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; 1560 int r; 1561 1562 /* 1563 * if reset_pending is set we are dealing with the bio for the first time, 1564 * else we're continuing to work on the previous bio, so don't mess with 1565 * the cc_pending counter 1566 */ 1567 if (reset_pending) 1568 atomic_set(&ctx->cc_pending, 1); 1569 1570 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 1571 1572 r = crypt_alloc_req(cc, ctx); 1573 if (r) { 1574 complete(&ctx->restart); 1575 return BLK_STS_DEV_RESOURCE; 1576 } 1577 1578 atomic_inc(&ctx->cc_pending); 1579 1580 if (crypt_integrity_aead(cc)) 1581 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, ctx->tag_offset); 1582 else 1583 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, ctx->tag_offset); 1584 1585 switch (r) { 1586 /* 1587 * The request was queued by a crypto driver 1588 * but the driver request queue is full, let's wait. 1589 */ 1590 case -EBUSY: 1591 if (in_interrupt()) { 1592 if (try_wait_for_completion(&ctx->restart)) { 1593 /* 1594 * we don't have to block to wait for completion, 1595 * so proceed 1596 */ 1597 } else { 1598 /* 1599 * we can't wait for completion without blocking 1600 * exit and continue processing in a workqueue 1601 */ 1602 ctx->r.req = NULL; 1603 ctx->tag_offset++; 1604 ctx->cc_sector += sector_step; 1605 return BLK_STS_DEV_RESOURCE; 1606 } 1607 } else { 1608 wait_for_completion(&ctx->restart); 1609 } 1610 reinit_completion(&ctx->restart); 1611 fallthrough; 1612 /* 1613 * The request is queued and processed asynchronously, 1614 * completion function kcryptd_async_done() will be called. 1615 */ 1616 case -EINPROGRESS: 1617 ctx->r.req = NULL; 1618 ctx->tag_offset++; 1619 ctx->cc_sector += sector_step; 1620 continue; 1621 /* 1622 * The request was already processed (synchronously). 1623 */ 1624 case 0: 1625 atomic_dec(&ctx->cc_pending); 1626 ctx->cc_sector += sector_step; 1627 ctx->tag_offset++; 1628 if (!atomic) 1629 cond_resched(); 1630 continue; 1631 /* 1632 * There was a data integrity error. 1633 */ 1634 case -EBADMSG: 1635 atomic_dec(&ctx->cc_pending); 1636 return BLK_STS_PROTECTION; 1637 /* 1638 * There was an error while processing the request. 1639 */ 1640 default: 1641 atomic_dec(&ctx->cc_pending); 1642 return BLK_STS_IOERR; 1643 } 1644 } 1645 1646 return 0; 1647 } 1648 1649 static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1650 1651 /* 1652 * Generate a new unfragmented bio with the given size 1653 * This should never violate the device limitations (but if it did then block 1654 * core should split the bio as needed). 1655 * 1656 * This function may be called concurrently. If we allocate from the mempool 1657 * concurrently, there is a possibility of deadlock. For example, if we have 1658 * mempool of 256 pages, two processes, each wanting 256, pages allocate from 1659 * the mempool concurrently, it may deadlock in a situation where both processes 1660 * have allocated 128 pages and the mempool is exhausted. 1661 * 1662 * In order to avoid this scenario we allocate the pages under a mutex. 1663 * 1664 * In order to not degrade performance with excessive locking, we try 1665 * non-blocking allocations without a mutex first but on failure we fallback 1666 * to blocking allocations with a mutex. 1667 * 1668 * In order to reduce allocation overhead, we try to allocate compound pages in 1669 * the first pass. If they are not available, we fall back to the mempool. 1670 */ 1671 static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size) 1672 { 1673 struct crypt_config *cc = io->cc; 1674 struct bio *clone; 1675 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1676 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 1677 unsigned int remaining_size; 1678 unsigned int order = MAX_PAGE_ORDER; 1679 1680 retry: 1681 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 1682 mutex_lock(&cc->bio_alloc_lock); 1683 1684 clone = bio_alloc_bioset(cc->dev->bdev, nr_iovecs, io->base_bio->bi_opf, 1685 GFP_NOIO, &cc->bs); 1686 clone->bi_private = io; 1687 clone->bi_end_io = crypt_endio; 1688 clone->bi_ioprio = io->base_bio->bi_ioprio; 1689 clone->bi_iter.bi_sector = cc->start + io->sector; 1690 1691 remaining_size = size; 1692 1693 while (remaining_size) { 1694 struct page *pages; 1695 unsigned size_to_add; 1696 unsigned remaining_order = __fls((remaining_size + PAGE_SIZE - 1) >> PAGE_SHIFT); 1697 order = min(order, remaining_order); 1698 1699 while (order > 0) { 1700 if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) + 1701 (1 << order) > dm_crypt_pages_per_client)) 1702 goto decrease_order; 1703 pages = alloc_pages(gfp_mask 1704 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | __GFP_COMP, 1705 order); 1706 if (likely(pages != NULL)) { 1707 percpu_counter_add(&cc->n_allocated_pages, 1 << order); 1708 goto have_pages; 1709 } 1710 decrease_order: 1711 order--; 1712 } 1713 1714 pages = mempool_alloc(&cc->page_pool, gfp_mask); 1715 if (!pages) { 1716 crypt_free_buffer_pages(cc, clone); 1717 bio_put(clone); 1718 gfp_mask |= __GFP_DIRECT_RECLAIM; 1719 order = 0; 1720 goto retry; 1721 } 1722 1723 have_pages: 1724 size_to_add = min((unsigned)PAGE_SIZE << order, remaining_size); 1725 __bio_add_page(clone, pages, size_to_add, 0); 1726 remaining_size -= size_to_add; 1727 } 1728 1729 /* Allocate space for integrity tags */ 1730 if (dm_crypt_integrity_io_alloc(io, clone)) { 1731 crypt_free_buffer_pages(cc, clone); 1732 bio_put(clone); 1733 clone = NULL; 1734 } 1735 1736 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 1737 mutex_unlock(&cc->bio_alloc_lock); 1738 1739 return clone; 1740 } 1741 1742 static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 1743 { 1744 struct folio_iter fi; 1745 1746 if (clone->bi_vcnt > 0) { /* bio_for_each_folio_all crashes with an empty bio */ 1747 bio_for_each_folio_all(fi, clone) { 1748 if (folio_test_large(fi.folio)) { 1749 percpu_counter_sub(&cc->n_allocated_pages, 1750 folio_nr_pages(fi.folio)); 1751 folio_put(fi.folio); 1752 } else { 1753 mempool_free(&fi.folio->page, &cc->page_pool); 1754 } 1755 } 1756 } 1757 } 1758 1759 static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1760 struct bio *bio, sector_t sector) 1761 { 1762 io->cc = cc; 1763 io->base_bio = bio; 1764 io->sector = sector; 1765 io->error = 0; 1766 io->ctx.aead_recheck = false; 1767 io->ctx.aead_failed = false; 1768 io->ctx.r.req = NULL; 1769 io->integrity_metadata = NULL; 1770 io->integrity_metadata_from_pool = false; 1771 atomic_set(&io->io_pending, 0); 1772 } 1773 1774 static void crypt_inc_pending(struct dm_crypt_io *io) 1775 { 1776 atomic_inc(&io->io_pending); 1777 } 1778 1779 static void kcryptd_queue_read(struct dm_crypt_io *io); 1780 1781 /* 1782 * One of the bios was finished. Check for completion of 1783 * the whole request and correctly clean up the buffer. 1784 */ 1785 static void crypt_dec_pending(struct dm_crypt_io *io) 1786 { 1787 struct crypt_config *cc = io->cc; 1788 struct bio *base_bio = io->base_bio; 1789 blk_status_t error = io->error; 1790 1791 if (!atomic_dec_and_test(&io->io_pending)) 1792 return; 1793 1794 if (likely(!io->ctx.aead_recheck) && unlikely(io->ctx.aead_failed) && 1795 cc->used_tag_size && bio_data_dir(base_bio) == READ) { 1796 io->ctx.aead_recheck = true; 1797 io->ctx.aead_failed = false; 1798 io->error = 0; 1799 kcryptd_queue_read(io); 1800 return; 1801 } 1802 1803 if (io->ctx.r.req) 1804 crypt_free_req(cc, io->ctx.r.req, base_bio); 1805 1806 if (unlikely(io->integrity_metadata_from_pool)) 1807 mempool_free(io->integrity_metadata, &io->cc->tag_pool); 1808 else 1809 kfree(io->integrity_metadata); 1810 1811 base_bio->bi_status = error; 1812 1813 bio_endio(base_bio); 1814 } 1815 1816 /* 1817 * kcryptd/kcryptd_io: 1818 * 1819 * Needed because it would be very unwise to do decryption in an 1820 * interrupt context. 1821 * 1822 * kcryptd performs the actual encryption or decryption. 1823 * 1824 * kcryptd_io performs the IO submission. 1825 * 1826 * They must be separated as otherwise the final stages could be 1827 * starved by new requests which can block in the first stages due 1828 * to memory allocation. 1829 * 1830 * The work is done per CPU global for all dm-crypt instances. 1831 * They should not depend on each other and do not block. 1832 */ 1833 static void crypt_endio(struct bio *clone) 1834 { 1835 struct dm_crypt_io *io = clone->bi_private; 1836 struct crypt_config *cc = io->cc; 1837 unsigned int rw = bio_data_dir(clone); 1838 blk_status_t error = clone->bi_status; 1839 1840 if (io->ctx.aead_recheck && !error) { 1841 kcryptd_queue_crypt(io); 1842 return; 1843 } 1844 1845 /* 1846 * free the processed pages 1847 */ 1848 if (rw == WRITE || io->ctx.aead_recheck) 1849 crypt_free_buffer_pages(cc, clone); 1850 1851 bio_put(clone); 1852 1853 if (rw == READ && !error) { 1854 kcryptd_queue_crypt(io); 1855 return; 1856 } 1857 1858 if (unlikely(error)) 1859 io->error = error; 1860 1861 crypt_dec_pending(io); 1862 } 1863 1864 #define CRYPT_MAP_READ_GFP GFP_NOWAIT 1865 1866 static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 1867 { 1868 struct crypt_config *cc = io->cc; 1869 struct bio *clone; 1870 1871 if (io->ctx.aead_recheck) { 1872 if (!(gfp & __GFP_DIRECT_RECLAIM)) 1873 return 1; 1874 crypt_inc_pending(io); 1875 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 1876 if (unlikely(!clone)) { 1877 crypt_dec_pending(io); 1878 return 1; 1879 } 1880 crypt_convert_init(cc, &io->ctx, clone, clone, io->sector); 1881 io->saved_bi_iter = clone->bi_iter; 1882 dm_submit_bio_remap(io->base_bio, clone); 1883 return 0; 1884 } 1885 1886 /* 1887 * We need the original biovec array in order to decrypt the whole bio 1888 * data *afterwards* -- thanks to immutable biovecs we don't need to 1889 * worry about the block layer modifying the biovec array; so leverage 1890 * bio_alloc_clone(). 1891 */ 1892 clone = bio_alloc_clone(cc->dev->bdev, io->base_bio, gfp, &cc->bs); 1893 if (!clone) 1894 return 1; 1895 1896 clone->bi_iter.bi_sector = cc->start + io->sector; 1897 clone->bi_private = io; 1898 clone->bi_end_io = crypt_endio; 1899 1900 crypt_inc_pending(io); 1901 1902 if (dm_crypt_integrity_io_alloc(io, clone)) { 1903 crypt_dec_pending(io); 1904 bio_put(clone); 1905 return 1; 1906 } 1907 1908 dm_submit_bio_remap(io->base_bio, clone); 1909 return 0; 1910 } 1911 1912 static void kcryptd_io_read_work(struct work_struct *work) 1913 { 1914 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1915 1916 crypt_inc_pending(io); 1917 if (kcryptd_io_read(io, GFP_NOIO)) 1918 io->error = BLK_STS_RESOURCE; 1919 crypt_dec_pending(io); 1920 } 1921 1922 static void kcryptd_queue_read(struct dm_crypt_io *io) 1923 { 1924 struct crypt_config *cc = io->cc; 1925 1926 INIT_WORK(&io->work, kcryptd_io_read_work); 1927 queue_work(cc->io_queue, &io->work); 1928 } 1929 1930 static void kcryptd_io_write(struct dm_crypt_io *io) 1931 { 1932 struct bio *clone = io->ctx.bio_out; 1933 1934 dm_submit_bio_remap(io->base_bio, clone); 1935 } 1936 1937 #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1938 1939 static int dmcrypt_write(void *data) 1940 { 1941 struct crypt_config *cc = data; 1942 struct dm_crypt_io *io; 1943 1944 while (1) { 1945 struct rb_root write_tree; 1946 struct blk_plug plug; 1947 1948 spin_lock_irq(&cc->write_thread_lock); 1949 continue_locked: 1950 1951 if (!RB_EMPTY_ROOT(&cc->write_tree)) 1952 goto pop_from_list; 1953 1954 set_current_state(TASK_INTERRUPTIBLE); 1955 1956 spin_unlock_irq(&cc->write_thread_lock); 1957 1958 if (unlikely(kthread_should_stop())) { 1959 set_current_state(TASK_RUNNING); 1960 break; 1961 } 1962 1963 schedule(); 1964 1965 spin_lock_irq(&cc->write_thread_lock); 1966 goto continue_locked; 1967 1968 pop_from_list: 1969 write_tree = cc->write_tree; 1970 cc->write_tree = RB_ROOT; 1971 spin_unlock_irq(&cc->write_thread_lock); 1972 1973 BUG_ON(rb_parent(write_tree.rb_node)); 1974 1975 /* 1976 * Note: we cannot walk the tree here with rb_next because 1977 * the structures may be freed when kcryptd_io_write is called. 1978 */ 1979 blk_start_plug(&plug); 1980 do { 1981 io = crypt_io_from_node(rb_first(&write_tree)); 1982 rb_erase(&io->rb_node, &write_tree); 1983 kcryptd_io_write(io); 1984 cond_resched(); 1985 } while (!RB_EMPTY_ROOT(&write_tree)); 1986 blk_finish_plug(&plug); 1987 } 1988 return 0; 1989 } 1990 1991 static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 1992 { 1993 struct bio *clone = io->ctx.bio_out; 1994 struct crypt_config *cc = io->cc; 1995 unsigned long flags; 1996 sector_t sector; 1997 struct rb_node **rbp, *parent; 1998 1999 if (unlikely(io->error)) { 2000 crypt_free_buffer_pages(cc, clone); 2001 bio_put(clone); 2002 crypt_dec_pending(io); 2003 return; 2004 } 2005 2006 /* crypt_convert should have filled the clone bio */ 2007 BUG_ON(io->ctx.iter_out.bi_size); 2008 2009 if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) || 2010 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) { 2011 dm_submit_bio_remap(io->base_bio, clone); 2012 return; 2013 } 2014 2015 spin_lock_irqsave(&cc->write_thread_lock, flags); 2016 if (RB_EMPTY_ROOT(&cc->write_tree)) 2017 wake_up_process(cc->write_thread); 2018 rbp = &cc->write_tree.rb_node; 2019 parent = NULL; 2020 sector = io->sector; 2021 while (*rbp) { 2022 parent = *rbp; 2023 if (sector < crypt_io_from_node(parent)->sector) 2024 rbp = &(*rbp)->rb_left; 2025 else 2026 rbp = &(*rbp)->rb_right; 2027 } 2028 rb_link_node(&io->rb_node, parent, rbp); 2029 rb_insert_color(&io->rb_node, &cc->write_tree); 2030 spin_unlock_irqrestore(&cc->write_thread_lock, flags); 2031 } 2032 2033 static bool kcryptd_crypt_write_inline(struct crypt_config *cc, 2034 struct convert_context *ctx) 2035 2036 { 2037 if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags)) 2038 return false; 2039 2040 /* 2041 * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering 2042 * constraints so they do not need to be issued inline by 2043 * kcryptd_crypt_write_convert(). 2044 */ 2045 switch (bio_op(ctx->bio_in)) { 2046 case REQ_OP_WRITE: 2047 case REQ_OP_WRITE_ZEROES: 2048 return true; 2049 default: 2050 return false; 2051 } 2052 } 2053 2054 static void kcryptd_crypt_write_continue(struct work_struct *work) 2055 { 2056 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 2057 struct crypt_config *cc = io->cc; 2058 struct convert_context *ctx = &io->ctx; 2059 int crypt_finished; 2060 blk_status_t r; 2061 2062 wait_for_completion(&ctx->restart); 2063 reinit_completion(&ctx->restart); 2064 2065 r = crypt_convert(cc, &io->ctx, false, false); 2066 if (r) 2067 io->error = r; 2068 crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 2069 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 2070 /* Wait for completion signaled by kcryptd_async_done() */ 2071 wait_for_completion(&ctx->restart); 2072 crypt_finished = 1; 2073 } 2074 2075 /* Encryption was already finished, submit io now */ 2076 if (crypt_finished) 2077 kcryptd_crypt_write_io_submit(io, 0); 2078 2079 crypt_dec_pending(io); 2080 } 2081 2082 static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 2083 { 2084 struct crypt_config *cc = io->cc; 2085 struct convert_context *ctx = &io->ctx; 2086 struct bio *clone; 2087 int crypt_finished; 2088 blk_status_t r; 2089 2090 /* 2091 * Prevent io from disappearing until this function completes. 2092 */ 2093 crypt_inc_pending(io); 2094 crypt_convert_init(cc, ctx, NULL, io->base_bio, io->sector); 2095 2096 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 2097 if (unlikely(!clone)) { 2098 io->error = BLK_STS_IOERR; 2099 goto dec; 2100 } 2101 2102 io->ctx.bio_out = clone; 2103 io->ctx.iter_out = clone->bi_iter; 2104 2105 if (crypt_integrity_aead(cc)) { 2106 bio_copy_data(clone, io->base_bio); 2107 io->ctx.bio_in = clone; 2108 io->ctx.iter_in = clone->bi_iter; 2109 } 2110 2111 crypt_inc_pending(io); 2112 r = crypt_convert(cc, ctx, 2113 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true); 2114 /* 2115 * Crypto API backlogged the request, because its queue was full 2116 * and we're in softirq context, so continue from a workqueue 2117 * (TODO: is it actually possible to be in softirq in the write path?) 2118 */ 2119 if (r == BLK_STS_DEV_RESOURCE) { 2120 INIT_WORK(&io->work, kcryptd_crypt_write_continue); 2121 queue_work(cc->crypt_queue, &io->work); 2122 return; 2123 } 2124 if (r) 2125 io->error = r; 2126 crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 2127 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 2128 /* Wait for completion signaled by kcryptd_async_done() */ 2129 wait_for_completion(&ctx->restart); 2130 crypt_finished = 1; 2131 } 2132 2133 /* Encryption was already finished, submit io now */ 2134 if (crypt_finished) 2135 kcryptd_crypt_write_io_submit(io, 0); 2136 2137 dec: 2138 crypt_dec_pending(io); 2139 } 2140 2141 static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 2142 { 2143 if (io->ctx.aead_recheck) { 2144 if (!io->error) { 2145 io->ctx.bio_in->bi_iter = io->saved_bi_iter; 2146 bio_copy_data(io->base_bio, io->ctx.bio_in); 2147 } 2148 crypt_free_buffer_pages(io->cc, io->ctx.bio_in); 2149 bio_put(io->ctx.bio_in); 2150 } 2151 crypt_dec_pending(io); 2152 } 2153 2154 static void kcryptd_crypt_read_continue(struct work_struct *work) 2155 { 2156 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 2157 struct crypt_config *cc = io->cc; 2158 blk_status_t r; 2159 2160 wait_for_completion(&io->ctx.restart); 2161 reinit_completion(&io->ctx.restart); 2162 2163 r = crypt_convert(cc, &io->ctx, false, false); 2164 if (r) 2165 io->error = r; 2166 2167 if (atomic_dec_and_test(&io->ctx.cc_pending)) 2168 kcryptd_crypt_read_done(io); 2169 2170 crypt_dec_pending(io); 2171 } 2172 2173 static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 2174 { 2175 struct crypt_config *cc = io->cc; 2176 blk_status_t r; 2177 2178 crypt_inc_pending(io); 2179 2180 if (io->ctx.aead_recheck) { 2181 r = crypt_convert(cc, &io->ctx, 2182 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); 2183 } else { 2184 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 2185 io->sector); 2186 2187 r = crypt_convert(cc, &io->ctx, 2188 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); 2189 } 2190 /* 2191 * Crypto API backlogged the request, because its queue was full 2192 * and we're in softirq context, so continue from a workqueue 2193 */ 2194 if (r == BLK_STS_DEV_RESOURCE) { 2195 INIT_WORK(&io->work, kcryptd_crypt_read_continue); 2196 queue_work(cc->crypt_queue, &io->work); 2197 return; 2198 } 2199 if (r) 2200 io->error = r; 2201 2202 if (atomic_dec_and_test(&io->ctx.cc_pending)) 2203 kcryptd_crypt_read_done(io); 2204 2205 crypt_dec_pending(io); 2206 } 2207 2208 static void kcryptd_async_done(void *data, int error) 2209 { 2210 struct dm_crypt_request *dmreq = data; 2211 struct convert_context *ctx = dmreq->ctx; 2212 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 2213 struct crypt_config *cc = io->cc; 2214 2215 /* 2216 * A request from crypto driver backlog is going to be processed now, 2217 * finish the completion and continue in crypt_convert(). 2218 * (Callback will be called for the second time for this request.) 2219 */ 2220 if (error == -EINPROGRESS) { 2221 complete(&ctx->restart); 2222 return; 2223 } 2224 2225 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 2226 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 2227 2228 if (error == -EBADMSG) { 2229 sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)); 2230 2231 ctx->aead_failed = true; 2232 if (ctx->aead_recheck) { 2233 DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu", 2234 ctx->bio_in->bi_bdev, s); 2235 dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", 2236 ctx->bio_in, s, 0); 2237 } 2238 io->error = BLK_STS_PROTECTION; 2239 } else if (error < 0) 2240 io->error = BLK_STS_IOERR; 2241 2242 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 2243 2244 if (!atomic_dec_and_test(&ctx->cc_pending)) 2245 return; 2246 2247 /* 2248 * The request is fully completed: for inline writes, let 2249 * kcryptd_crypt_write_convert() do the IO submission. 2250 */ 2251 if (bio_data_dir(io->base_bio) == READ) { 2252 kcryptd_crypt_read_done(io); 2253 return; 2254 } 2255 2256 if (kcryptd_crypt_write_inline(cc, ctx)) { 2257 complete(&ctx->restart); 2258 return; 2259 } 2260 2261 kcryptd_crypt_write_io_submit(io, 1); 2262 } 2263 2264 static void kcryptd_crypt(struct work_struct *work) 2265 { 2266 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 2267 2268 if (bio_data_dir(io->base_bio) == READ) 2269 kcryptd_crypt_read_convert(io); 2270 else 2271 kcryptd_crypt_write_convert(io); 2272 } 2273 2274 static void kcryptd_queue_crypt(struct dm_crypt_io *io) 2275 { 2276 struct crypt_config *cc = io->cc; 2277 2278 if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) || 2279 (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) { 2280 /* 2281 * in_hardirq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context. 2282 * irqs_disabled(): the kernel may run some IO completion from the idle thread, but 2283 * it is being executed with irqs disabled. 2284 */ 2285 if (in_hardirq() || irqs_disabled()) { 2286 INIT_WORK(&io->work, kcryptd_crypt); 2287 queue_work(system_bh_wq, &io->work); 2288 return; 2289 } else { 2290 kcryptd_crypt(&io->work); 2291 return; 2292 } 2293 } 2294 2295 INIT_WORK(&io->work, kcryptd_crypt); 2296 queue_work(cc->crypt_queue, &io->work); 2297 } 2298 2299 static void crypt_free_tfms_aead(struct crypt_config *cc) 2300 { 2301 if (!cc->cipher_tfm.tfms_aead) 2302 return; 2303 2304 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2305 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 2306 cc->cipher_tfm.tfms_aead[0] = NULL; 2307 } 2308 2309 kfree(cc->cipher_tfm.tfms_aead); 2310 cc->cipher_tfm.tfms_aead = NULL; 2311 } 2312 2313 static void crypt_free_tfms_skcipher(struct crypt_config *cc) 2314 { 2315 unsigned int i; 2316 2317 if (!cc->cipher_tfm.tfms) 2318 return; 2319 2320 for (i = 0; i < cc->tfms_count; i++) 2321 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 2322 crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 2323 cc->cipher_tfm.tfms[i] = NULL; 2324 } 2325 2326 kfree(cc->cipher_tfm.tfms); 2327 cc->cipher_tfm.tfms = NULL; 2328 } 2329 2330 static void crypt_free_tfms(struct crypt_config *cc) 2331 { 2332 if (crypt_integrity_aead(cc)) 2333 crypt_free_tfms_aead(cc); 2334 else 2335 crypt_free_tfms_skcipher(cc); 2336 } 2337 2338 static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 2339 { 2340 unsigned int i; 2341 int err; 2342 2343 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count, 2344 sizeof(struct crypto_skcipher *), 2345 GFP_KERNEL); 2346 if (!cc->cipher_tfm.tfms) 2347 return -ENOMEM; 2348 2349 for (i = 0; i < cc->tfms_count; i++) { 2350 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 2351 CRYPTO_ALG_ALLOCATES_MEMORY); 2352 if (IS_ERR(cc->cipher_tfm.tfms[i])) { 2353 err = PTR_ERR(cc->cipher_tfm.tfms[i]); 2354 crypt_free_tfms(cc); 2355 return err; 2356 } 2357 } 2358 2359 /* 2360 * dm-crypt performance can vary greatly depending on which crypto 2361 * algorithm implementation is used. Help people debug performance 2362 * problems by logging the ->cra_driver_name. 2363 */ 2364 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2365 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); 2366 return 0; 2367 } 2368 2369 static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 2370 { 2371 int err; 2372 2373 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 2374 if (!cc->cipher_tfm.tfms) 2375 return -ENOMEM; 2376 2377 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 2378 CRYPTO_ALG_ALLOCATES_MEMORY); 2379 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2380 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 2381 crypt_free_tfms(cc); 2382 return err; 2383 } 2384 2385 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2386 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); 2387 return 0; 2388 } 2389 2390 static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 2391 { 2392 if (crypt_integrity_aead(cc)) 2393 return crypt_alloc_tfms_aead(cc, ciphermode); 2394 else 2395 return crypt_alloc_tfms_skcipher(cc, ciphermode); 2396 } 2397 2398 static unsigned int crypt_subkey_size(struct crypt_config *cc) 2399 { 2400 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 2401 } 2402 2403 static unsigned int crypt_authenckey_size(struct crypt_config *cc) 2404 { 2405 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 2406 } 2407 2408 /* 2409 * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 2410 * the key must be for some reason in special format. 2411 * This funcion converts cc->key to this special format. 2412 */ 2413 static void crypt_copy_authenckey(char *p, const void *key, 2414 unsigned int enckeylen, unsigned int authkeylen) 2415 { 2416 struct crypto_authenc_key_param *param; 2417 struct rtattr *rta; 2418 2419 rta = (struct rtattr *)p; 2420 param = RTA_DATA(rta); 2421 param->enckeylen = cpu_to_be32(enckeylen); 2422 rta->rta_len = RTA_LENGTH(sizeof(*param)); 2423 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 2424 p += RTA_SPACE(sizeof(*param)); 2425 memcpy(p, key + enckeylen, authkeylen); 2426 p += authkeylen; 2427 memcpy(p, key, enckeylen); 2428 } 2429 2430 static int crypt_setkey(struct crypt_config *cc) 2431 { 2432 unsigned int subkey_size; 2433 int err = 0, i, r; 2434 2435 /* Ignore extra keys (which are used for IV etc) */ 2436 subkey_size = crypt_subkey_size(cc); 2437 2438 if (crypt_integrity_hmac(cc)) { 2439 if (subkey_size < cc->key_mac_size) 2440 return -EINVAL; 2441 2442 crypt_copy_authenckey(cc->authenc_key, cc->key, 2443 subkey_size - cc->key_mac_size, 2444 cc->key_mac_size); 2445 } 2446 2447 for (i = 0; i < cc->tfms_count; i++) { 2448 if (crypt_integrity_hmac(cc)) 2449 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2450 cc->authenc_key, crypt_authenckey_size(cc)); 2451 else if (crypt_integrity_aead(cc)) 2452 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2453 cc->key + (i * subkey_size), 2454 subkey_size); 2455 else 2456 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 2457 cc->key + (i * subkey_size), 2458 subkey_size); 2459 if (r) 2460 err = r; 2461 } 2462 2463 if (crypt_integrity_hmac(cc)) 2464 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 2465 2466 return err; 2467 } 2468 2469 #ifdef CONFIG_KEYS 2470 2471 static bool contains_whitespace(const char *str) 2472 { 2473 while (*str) 2474 if (isspace(*str++)) 2475 return true; 2476 return false; 2477 } 2478 2479 static int set_key_user(struct crypt_config *cc, struct key *key) 2480 { 2481 const struct user_key_payload *ukp; 2482 2483 ukp = user_key_payload_locked(key); 2484 if (!ukp) 2485 return -EKEYREVOKED; 2486 2487 if (cc->key_size != ukp->datalen) 2488 return -EINVAL; 2489 2490 memcpy(cc->key, ukp->data, cc->key_size); 2491 2492 return 0; 2493 } 2494 2495 static int set_key_encrypted(struct crypt_config *cc, struct key *key) 2496 { 2497 const struct encrypted_key_payload *ekp; 2498 2499 ekp = key->payload.data[0]; 2500 if (!ekp) 2501 return -EKEYREVOKED; 2502 2503 if (cc->key_size != ekp->decrypted_datalen) 2504 return -EINVAL; 2505 2506 memcpy(cc->key, ekp->decrypted_data, cc->key_size); 2507 2508 return 0; 2509 } 2510 2511 static int set_key_trusted(struct crypt_config *cc, struct key *key) 2512 { 2513 const struct trusted_key_payload *tkp; 2514 2515 tkp = key->payload.data[0]; 2516 if (!tkp) 2517 return -EKEYREVOKED; 2518 2519 if (cc->key_size != tkp->key_len) 2520 return -EINVAL; 2521 2522 memcpy(cc->key, tkp->key, cc->key_size); 2523 2524 return 0; 2525 } 2526 2527 static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2528 { 2529 char *new_key_string, *key_desc; 2530 int ret; 2531 struct key_type *type; 2532 struct key *key; 2533 int (*set_key)(struct crypt_config *cc, struct key *key); 2534 2535 /* 2536 * Reject key_string with whitespace. dm core currently lacks code for 2537 * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 2538 */ 2539 if (contains_whitespace(key_string)) { 2540 DMERR("whitespace chars not allowed in key string"); 2541 return -EINVAL; 2542 } 2543 2544 /* look for next ':' separating key_type from key_description */ 2545 key_desc = strchr(key_string, ':'); 2546 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 2547 return -EINVAL; 2548 2549 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) { 2550 type = &key_type_logon; 2551 set_key = set_key_user; 2552 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) { 2553 type = &key_type_user; 2554 set_key = set_key_user; 2555 } else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) && 2556 !strncmp(key_string, "encrypted:", key_desc - key_string + 1)) { 2557 type = &key_type_encrypted; 2558 set_key = set_key_encrypted; 2559 } else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) && 2560 !strncmp(key_string, "trusted:", key_desc - key_string + 1)) { 2561 type = &key_type_trusted; 2562 set_key = set_key_trusted; 2563 } else { 2564 return -EINVAL; 2565 } 2566 2567 new_key_string = kstrdup(key_string, GFP_KERNEL); 2568 if (!new_key_string) 2569 return -ENOMEM; 2570 2571 key = request_key(type, key_desc + 1, NULL); 2572 if (IS_ERR(key)) { 2573 ret = PTR_ERR(key); 2574 goto free_new_key_string; 2575 } 2576 2577 down_read(&key->sem); 2578 ret = set_key(cc, key); 2579 up_read(&key->sem); 2580 key_put(key); 2581 if (ret < 0) 2582 goto free_new_key_string; 2583 2584 /* clear the flag since following operations may invalidate previously valid key */ 2585 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2586 2587 ret = crypt_setkey(cc); 2588 if (ret) 2589 goto free_new_key_string; 2590 2591 set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2592 kfree_sensitive(cc->key_string); 2593 cc->key_string = new_key_string; 2594 return 0; 2595 2596 free_new_key_string: 2597 kfree_sensitive(new_key_string); 2598 return ret; 2599 } 2600 2601 static int get_key_size(char **key_string) 2602 { 2603 char *colon, dummy; 2604 int ret; 2605 2606 if (*key_string[0] != ':') 2607 return strlen(*key_string) >> 1; 2608 2609 /* look for next ':' in key string */ 2610 colon = strpbrk(*key_string + 1, ":"); 2611 if (!colon) 2612 return -EINVAL; 2613 2614 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2615 return -EINVAL; 2616 2617 *key_string = colon; 2618 2619 /* remaining key string should be :<logon|user>:<key_desc> */ 2620 2621 return ret; 2622 } 2623 2624 #else 2625 2626 static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2627 { 2628 return -EINVAL; 2629 } 2630 2631 static int get_key_size(char **key_string) 2632 { 2633 return (*key_string[0] == ':') ? -EINVAL : (int)(strlen(*key_string) >> 1); 2634 } 2635 2636 #endif /* CONFIG_KEYS */ 2637 2638 static int crypt_set_key(struct crypt_config *cc, char *key) 2639 { 2640 int r = -EINVAL; 2641 int key_string_len = strlen(key); 2642 2643 /* Hyphen (which gives a key_size of zero) means there is no key. */ 2644 if (!cc->key_size && strcmp(key, "-")) 2645 goto out; 2646 2647 /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2648 if (key[0] == ':') { 2649 r = crypt_set_keyring_key(cc, key + 1); 2650 goto out; 2651 } 2652 2653 /* clear the flag since following operations may invalidate previously valid key */ 2654 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2655 2656 /* wipe references to any kernel keyring key */ 2657 kfree_sensitive(cc->key_string); 2658 cc->key_string = NULL; 2659 2660 /* Decode key from its hex representation. */ 2661 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) 2662 goto out; 2663 2664 r = crypt_setkey(cc); 2665 if (!r) 2666 set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2667 2668 out: 2669 /* Hex key string not needed after here, so wipe it. */ 2670 memset(key, '0', key_string_len); 2671 2672 return r; 2673 } 2674 2675 static int crypt_wipe_key(struct crypt_config *cc) 2676 { 2677 int r; 2678 2679 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2680 get_random_bytes(&cc->key, cc->key_size); 2681 2682 /* Wipe IV private keys */ 2683 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 2684 r = cc->iv_gen_ops->wipe(cc); 2685 if (r) 2686 return r; 2687 } 2688 2689 kfree_sensitive(cc->key_string); 2690 cc->key_string = NULL; 2691 r = crypt_setkey(cc); 2692 memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2693 2694 return r; 2695 } 2696 2697 static void crypt_calculate_pages_per_client(void) 2698 { 2699 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; 2700 2701 if (!dm_crypt_clients_n) 2702 return; 2703 2704 pages /= dm_crypt_clients_n; 2705 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) 2706 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; 2707 dm_crypt_pages_per_client = pages; 2708 } 2709 2710 static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) 2711 { 2712 struct crypt_config *cc = pool_data; 2713 struct page *page; 2714 2715 /* 2716 * Note, percpu_counter_read_positive() may over (and under) estimate 2717 * the current usage by at most (batch - 1) * num_online_cpus() pages, 2718 * but avoids potential spinlock contention of an exact result. 2719 */ 2720 if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) >= dm_crypt_pages_per_client) && 2721 likely(gfp_mask & __GFP_NORETRY)) 2722 return NULL; 2723 2724 page = alloc_page(gfp_mask); 2725 if (likely(page != NULL)) 2726 percpu_counter_add(&cc->n_allocated_pages, 1); 2727 2728 return page; 2729 } 2730 2731 static void crypt_page_free(void *page, void *pool_data) 2732 { 2733 struct crypt_config *cc = pool_data; 2734 2735 __free_page(page); 2736 percpu_counter_sub(&cc->n_allocated_pages, 1); 2737 } 2738 2739 static void crypt_dtr(struct dm_target *ti) 2740 { 2741 struct crypt_config *cc = ti->private; 2742 2743 ti->private = NULL; 2744 2745 if (!cc) 2746 return; 2747 2748 if (cc->write_thread) 2749 kthread_stop(cc->write_thread); 2750 2751 if (cc->io_queue) 2752 destroy_workqueue(cc->io_queue); 2753 if (cc->crypt_queue) 2754 destroy_workqueue(cc->crypt_queue); 2755 2756 if (cc->workqueue_id) 2757 ida_free(&workqueue_ida, cc->workqueue_id); 2758 2759 crypt_free_tfms(cc); 2760 2761 bioset_exit(&cc->bs); 2762 2763 mempool_exit(&cc->page_pool); 2764 mempool_exit(&cc->req_pool); 2765 mempool_exit(&cc->tag_pool); 2766 2767 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); 2768 percpu_counter_destroy(&cc->n_allocated_pages); 2769 2770 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 2771 cc->iv_gen_ops->dtr(cc); 2772 2773 if (cc->dev) 2774 dm_put_device(ti, cc->dev); 2775 2776 kfree_sensitive(cc->cipher_string); 2777 kfree_sensitive(cc->key_string); 2778 kfree_sensitive(cc->cipher_auth); 2779 kfree_sensitive(cc->authenc_key); 2780 2781 mutex_destroy(&cc->bio_alloc_lock); 2782 2783 /* Must zero key material before freeing */ 2784 kfree_sensitive(cc); 2785 2786 spin_lock(&dm_crypt_clients_lock); 2787 WARN_ON(!dm_crypt_clients_n); 2788 dm_crypt_clients_n--; 2789 crypt_calculate_pages_per_client(); 2790 spin_unlock(&dm_crypt_clients_lock); 2791 2792 dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1); 2793 } 2794 2795 static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 2796 { 2797 struct crypt_config *cc = ti->private; 2798 2799 if (crypt_integrity_aead(cc)) 2800 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2801 else 2802 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2803 2804 if (cc->iv_size) 2805 /* at least a 64 bit sector number should fit in our buffer */ 2806 cc->iv_size = max(cc->iv_size, 2807 (unsigned int)(sizeof(u64) / sizeof(u8))); 2808 else if (ivmode) { 2809 DMWARN("Selected cipher does not support IVs"); 2810 ivmode = NULL; 2811 } 2812 2813 /* Choose ivmode, see comments at iv code. */ 2814 if (ivmode == NULL) 2815 cc->iv_gen_ops = NULL; 2816 else if (strcmp(ivmode, "plain") == 0) 2817 cc->iv_gen_ops = &crypt_iv_plain_ops; 2818 else if (strcmp(ivmode, "plain64") == 0) 2819 cc->iv_gen_ops = &crypt_iv_plain64_ops; 2820 else if (strcmp(ivmode, "plain64be") == 0) 2821 cc->iv_gen_ops = &crypt_iv_plain64be_ops; 2822 else if (strcmp(ivmode, "essiv") == 0) 2823 cc->iv_gen_ops = &crypt_iv_essiv_ops; 2824 else if (strcmp(ivmode, "benbi") == 0) 2825 cc->iv_gen_ops = &crypt_iv_benbi_ops; 2826 else if (strcmp(ivmode, "null") == 0) 2827 cc->iv_gen_ops = &crypt_iv_null_ops; 2828 else if (strcmp(ivmode, "eboiv") == 0) 2829 cc->iv_gen_ops = &crypt_iv_eboiv_ops; 2830 else if (strcmp(ivmode, "elephant") == 0) { 2831 cc->iv_gen_ops = &crypt_iv_elephant_ops; 2832 cc->key_parts = 2; 2833 cc->key_extra_size = cc->key_size / 2; 2834 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE) 2835 return -EINVAL; 2836 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags); 2837 } else if (strcmp(ivmode, "lmk") == 0) { 2838 cc->iv_gen_ops = &crypt_iv_lmk_ops; 2839 /* 2840 * Version 2 and 3 is recognised according 2841 * to length of provided multi-key string. 2842 * If present (version 3), last key is used as IV seed. 2843 * All keys (including IV seed) are always the same size. 2844 */ 2845 if (cc->key_size % cc->key_parts) { 2846 cc->key_parts++; 2847 cc->key_extra_size = cc->key_size / cc->key_parts; 2848 } 2849 } else if (strcmp(ivmode, "tcw") == 0) { 2850 cc->iv_gen_ops = &crypt_iv_tcw_ops; 2851 cc->key_parts += 2; /* IV + whitening */ 2852 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2853 } else if (strcmp(ivmode, "random") == 0) { 2854 cc->iv_gen_ops = &crypt_iv_random_ops; 2855 /* Need storage space in integrity fields. */ 2856 cc->integrity_iv_size = cc->iv_size; 2857 } else { 2858 ti->error = "Invalid IV mode"; 2859 return -EINVAL; 2860 } 2861 2862 return 0; 2863 } 2864 2865 /* 2866 * Workaround to parse HMAC algorithm from AEAD crypto API spec. 2867 * The HMAC is needed to calculate tag size (HMAC digest size). 2868 * This should be probably done by crypto-api calls (once available...) 2869 */ 2870 static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 2871 { 2872 char *start, *end, *mac_alg = NULL; 2873 struct crypto_ahash *mac; 2874 2875 if (!strstarts(cipher_api, "authenc(")) 2876 return 0; 2877 2878 start = strchr(cipher_api, '('); 2879 end = strchr(cipher_api, ','); 2880 if (!start || !end || ++start > end) 2881 return -EINVAL; 2882 2883 mac_alg = kmemdup_nul(start, end - start, GFP_KERNEL); 2884 if (!mac_alg) 2885 return -ENOMEM; 2886 2887 mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY); 2888 kfree(mac_alg); 2889 2890 if (IS_ERR(mac)) 2891 return PTR_ERR(mac); 2892 2893 if (!test_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags)) 2894 cc->key_mac_size = crypto_ahash_digestsize(mac); 2895 crypto_free_ahash(mac); 2896 2897 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 2898 if (!cc->authenc_key) 2899 return -ENOMEM; 2900 2901 return 0; 2902 } 2903 2904 static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 2905 char **ivmode, char **ivopts) 2906 { 2907 struct crypt_config *cc = ti->private; 2908 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; 2909 int ret = -EINVAL; 2910 2911 cc->tfms_count = 1; 2912 2913 /* 2914 * New format (capi: prefix) 2915 * capi:cipher_api_spec-iv:ivopts 2916 */ 2917 tmp = &cipher_in[strlen("capi:")]; 2918 2919 /* Separate IV options if present, it can contain another '-' in hash name */ 2920 *ivopts = strrchr(tmp, ':'); 2921 if (*ivopts) { 2922 **ivopts = '\0'; 2923 (*ivopts)++; 2924 } 2925 /* Parse IV mode */ 2926 *ivmode = strrchr(tmp, '-'); 2927 if (*ivmode) { 2928 **ivmode = '\0'; 2929 (*ivmode)++; 2930 } 2931 /* The rest is crypto API spec */ 2932 cipher_api = tmp; 2933 2934 /* Alloc AEAD, can be used only in new format. */ 2935 if (crypt_integrity_aead(cc)) { 2936 ret = crypt_ctr_auth_cipher(cc, cipher_api); 2937 if (ret < 0) { 2938 ti->error = "Invalid AEAD cipher spec"; 2939 return ret; 2940 } 2941 } 2942 2943 if (*ivmode && !strcmp(*ivmode, "lmk")) 2944 cc->tfms_count = 64; 2945 2946 if (*ivmode && !strcmp(*ivmode, "essiv")) { 2947 if (!*ivopts) { 2948 ti->error = "Digest algorithm missing for ESSIV mode"; 2949 return -EINVAL; 2950 } 2951 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)", 2952 cipher_api, *ivopts); 2953 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 2954 ti->error = "Cannot allocate cipher string"; 2955 return -ENOMEM; 2956 } 2957 cipher_api = buf; 2958 } 2959 2960 cc->key_parts = cc->tfms_count; 2961 2962 /* Allocate cipher */ 2963 ret = crypt_alloc_tfms(cc, cipher_api); 2964 if (ret < 0) { 2965 ti->error = "Error allocating crypto tfm"; 2966 return ret; 2967 } 2968 2969 if (crypt_integrity_aead(cc)) 2970 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2971 else 2972 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2973 2974 return 0; 2975 } 2976 2977 static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 2978 char **ivmode, char **ivopts) 2979 { 2980 struct crypt_config *cc = ti->private; 2981 char *tmp, *cipher, *chainmode, *keycount; 2982 char *cipher_api = NULL; 2983 int ret = -EINVAL; 2984 char dummy; 2985 2986 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 2987 ti->error = "Bad cipher specification"; 2988 return -EINVAL; 2989 } 2990 2991 /* 2992 * Legacy dm-crypt cipher specification 2993 * cipher[:keycount]-mode-iv:ivopts 2994 */ 2995 tmp = cipher_in; 2996 keycount = strsep(&tmp, "-"); 2997 cipher = strsep(&keycount, ":"); 2998 2999 if (!keycount) 3000 cc->tfms_count = 1; 3001 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 3002 !is_power_of_2(cc->tfms_count)) { 3003 ti->error = "Bad cipher key count specification"; 3004 return -EINVAL; 3005 } 3006 cc->key_parts = cc->tfms_count; 3007 3008 chainmode = strsep(&tmp, "-"); 3009 *ivmode = strsep(&tmp, ":"); 3010 *ivopts = tmp; 3011 3012 /* 3013 * For compatibility with the original dm-crypt mapping format, if 3014 * only the cipher name is supplied, use cbc-plain. 3015 */ 3016 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 3017 chainmode = "cbc"; 3018 *ivmode = "plain"; 3019 } 3020 3021 if (strcmp(chainmode, "ecb") && !*ivmode) { 3022 ti->error = "IV mechanism required"; 3023 return -EINVAL; 3024 } 3025 3026 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 3027 if (!cipher_api) 3028 goto bad_mem; 3029 3030 if (*ivmode && !strcmp(*ivmode, "essiv")) { 3031 if (!*ivopts) { 3032 ti->error = "Digest algorithm missing for ESSIV mode"; 3033 kfree(cipher_api); 3034 return -EINVAL; 3035 } 3036 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 3037 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts); 3038 } else { 3039 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 3040 "%s(%s)", chainmode, cipher); 3041 } 3042 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 3043 kfree(cipher_api); 3044 goto bad_mem; 3045 } 3046 3047 /* Allocate cipher */ 3048 ret = crypt_alloc_tfms(cc, cipher_api); 3049 if (ret < 0) { 3050 ti->error = "Error allocating crypto tfm"; 3051 kfree(cipher_api); 3052 return ret; 3053 } 3054 kfree(cipher_api); 3055 3056 return 0; 3057 bad_mem: 3058 ti->error = "Cannot allocate cipher strings"; 3059 return -ENOMEM; 3060 } 3061 3062 static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 3063 { 3064 struct crypt_config *cc = ti->private; 3065 char *ivmode = NULL, *ivopts = NULL; 3066 int ret; 3067 3068 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 3069 if (!cc->cipher_string) { 3070 ti->error = "Cannot allocate cipher strings"; 3071 return -ENOMEM; 3072 } 3073 3074 if (strstarts(cipher_in, "capi:")) 3075 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 3076 else 3077 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 3078 if (ret) 3079 return ret; 3080 3081 /* Initialize IV */ 3082 ret = crypt_ctr_ivmode(ti, ivmode); 3083 if (ret < 0) 3084 return ret; 3085 3086 /* Initialize and set key */ 3087 ret = crypt_set_key(cc, key); 3088 if (ret < 0) { 3089 ti->error = "Error decoding and setting key"; 3090 return ret; 3091 } 3092 3093 /* Allocate IV */ 3094 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 3095 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 3096 if (ret < 0) { 3097 ti->error = "Error creating IV"; 3098 return ret; 3099 } 3100 } 3101 3102 /* Initialize IV (set keys for ESSIV etc) */ 3103 if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 3104 ret = cc->iv_gen_ops->init(cc); 3105 if (ret < 0) { 3106 ti->error = "Error initialising IV"; 3107 return ret; 3108 } 3109 } 3110 3111 /* wipe the kernel key payload copy */ 3112 if (cc->key_string) 3113 memset(cc->key, 0, cc->key_size * sizeof(u8)); 3114 3115 return ret; 3116 } 3117 3118 static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 3119 { 3120 struct crypt_config *cc = ti->private; 3121 struct dm_arg_set as; 3122 static const struct dm_arg _args[] = { 3123 {0, 9, "Invalid number of feature args"}, 3124 }; 3125 unsigned int opt_params, val; 3126 const char *opt_string, *sval; 3127 char dummy; 3128 int ret; 3129 3130 /* Optional parameters */ 3131 as.argc = argc; 3132 as.argv = argv; 3133 3134 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 3135 if (ret) 3136 return ret; 3137 3138 while (opt_params--) { 3139 opt_string = dm_shift_arg(&as); 3140 if (!opt_string) { 3141 ti->error = "Not enough feature arguments"; 3142 return -EINVAL; 3143 } 3144 3145 if (!strcasecmp(opt_string, "allow_discards")) 3146 ti->num_discard_bios = 1; 3147 3148 else if (!strcasecmp(opt_string, "same_cpu_crypt")) 3149 set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 3150 else if (!strcasecmp(opt_string, "high_priority")) 3151 set_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags); 3152 3153 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 3154 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 3155 else if (!strcasecmp(opt_string, "no_read_workqueue")) 3156 set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 3157 else if (!strcasecmp(opt_string, "no_write_workqueue")) 3158 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3159 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 3160 if (val == 0 || val > MAX_TAG_SIZE) { 3161 ti->error = "Invalid integrity arguments"; 3162 return -EINVAL; 3163 } 3164 cc->used_tag_size = val; 3165 sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 3166 if (!strcasecmp(sval, "aead")) { 3167 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 3168 } else if (strcasecmp(sval, "none")) { 3169 ti->error = "Unknown integrity profile"; 3170 return -EINVAL; 3171 } 3172 3173 cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 3174 if (!cc->cipher_auth) 3175 return -ENOMEM; 3176 } else if (sscanf(opt_string, "integrity_key_size:%u%c", &val, &dummy) == 1) { 3177 if (!val) { 3178 ti->error = "Invalid integrity_key_size argument"; 3179 return -EINVAL; 3180 } 3181 cc->key_mac_size = val; 3182 set_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags); 3183 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { 3184 if (cc->sector_size < (1 << SECTOR_SHIFT) || 3185 cc->sector_size > 4096 || 3186 (cc->sector_size & (cc->sector_size - 1))) { 3187 ti->error = "Invalid feature value for sector_size"; 3188 return -EINVAL; 3189 } 3190 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { 3191 ti->error = "Device size is not multiple of sector_size feature"; 3192 return -EINVAL; 3193 } 3194 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; 3195 } else if (!strcasecmp(opt_string, "iv_large_sectors")) 3196 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3197 else { 3198 ti->error = "Invalid feature arguments"; 3199 return -EINVAL; 3200 } 3201 } 3202 3203 return 0; 3204 } 3205 3206 #ifdef CONFIG_BLK_DEV_ZONED 3207 static int crypt_report_zones(struct dm_target *ti, 3208 struct dm_report_zones_args *args, unsigned int nr_zones) 3209 { 3210 struct crypt_config *cc = ti->private; 3211 3212 return dm_report_zones(cc->dev->bdev, cc->start, 3213 cc->start + dm_target_offset(ti, args->next_sector), 3214 args, nr_zones); 3215 } 3216 #else 3217 #define crypt_report_zones NULL 3218 #endif 3219 3220 /* 3221 * Construct an encryption mapping: 3222 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 3223 */ 3224 static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 3225 { 3226 struct crypt_config *cc; 3227 const char *devname = dm_table_device_name(ti->table); 3228 int key_size, wq_id; 3229 unsigned int align_mask; 3230 unsigned int common_wq_flags; 3231 unsigned long long tmpll; 3232 int ret; 3233 size_t iv_size_padding, additional_req_size; 3234 char dummy; 3235 3236 if (argc < 5) { 3237 ti->error = "Not enough arguments"; 3238 return -EINVAL; 3239 } 3240 3241 key_size = get_key_size(&argv[1]); 3242 if (key_size < 0) { 3243 ti->error = "Cannot parse key size"; 3244 return -EINVAL; 3245 } 3246 3247 cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL); 3248 if (!cc) { 3249 ti->error = "Cannot allocate encryption context"; 3250 return -ENOMEM; 3251 } 3252 cc->key_size = key_size; 3253 cc->sector_size = (1 << SECTOR_SHIFT); 3254 cc->sector_shift = 0; 3255 3256 ti->private = cc; 3257 3258 spin_lock(&dm_crypt_clients_lock); 3259 dm_crypt_clients_n++; 3260 crypt_calculate_pages_per_client(); 3261 spin_unlock(&dm_crypt_clients_lock); 3262 3263 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); 3264 if (ret < 0) 3265 goto bad; 3266 3267 /* Optional parameters need to be read before cipher constructor */ 3268 if (argc > 5) { 3269 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 3270 if (ret) 3271 goto bad; 3272 } 3273 3274 ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 3275 if (ret < 0) 3276 goto bad; 3277 3278 if (crypt_integrity_aead(cc)) { 3279 cc->dmreq_start = sizeof(struct aead_request); 3280 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 3281 align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 3282 } else { 3283 cc->dmreq_start = sizeof(struct skcipher_request); 3284 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 3285 align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 3286 } 3287 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 3288 3289 if (align_mask < CRYPTO_MINALIGN) { 3290 /* Allocate the padding exactly */ 3291 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 3292 & align_mask; 3293 } else { 3294 /* 3295 * If the cipher requires greater alignment than kmalloc 3296 * alignment, we don't know the exact position of the 3297 * initialization vector. We must assume worst case. 3298 */ 3299 iv_size_padding = align_mask; 3300 } 3301 3302 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 3303 additional_req_size = sizeof(struct dm_crypt_request) + 3304 iv_size_padding + cc->iv_size + 3305 cc->iv_size + 3306 sizeof(uint64_t) + 3307 sizeof(unsigned int); 3308 3309 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); 3310 if (ret) { 3311 ti->error = "Cannot allocate crypt request mempool"; 3312 goto bad; 3313 } 3314 3315 cc->per_bio_data_size = ti->per_io_data_size = 3316 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 3317 ARCH_DMA_MINALIGN); 3318 3319 ret = mempool_init(&cc->page_pool, BIO_MAX_VECS, crypt_page_alloc, crypt_page_free, cc); 3320 if (ret) { 3321 ti->error = "Cannot allocate page mempool"; 3322 goto bad; 3323 } 3324 3325 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); 3326 if (ret) { 3327 ti->error = "Cannot allocate crypt bioset"; 3328 goto bad; 3329 } 3330 3331 mutex_init(&cc->bio_alloc_lock); 3332 3333 ret = -EINVAL; 3334 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || 3335 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { 3336 ti->error = "Invalid iv_offset sector"; 3337 goto bad; 3338 } 3339 cc->iv_offset = tmpll; 3340 3341 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 3342 if (ret) { 3343 ti->error = "Device lookup failed"; 3344 goto bad; 3345 } 3346 3347 ret = -EINVAL; 3348 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { 3349 ti->error = "Invalid device sector"; 3350 goto bad; 3351 } 3352 cc->start = tmpll; 3353 3354 if (bdev_is_zoned(cc->dev->bdev)) { 3355 /* 3356 * For zoned block devices, we need to preserve the issuer write 3357 * ordering. To do so, disable write workqueues and force inline 3358 * encryption completion. 3359 */ 3360 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3361 set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags); 3362 3363 /* 3364 * All zone append writes to a zone of a zoned block device will 3365 * have the same BIO sector, the start of the zone. When the 3366 * cypher IV mode uses sector values, all data targeting a 3367 * zone will be encrypted using the first sector numbers of the 3368 * zone. This will not result in write errors but will 3369 * cause most reads to fail as reads will use the sector values 3370 * for the actual data locations, resulting in IV mismatch. 3371 * To avoid this problem, ask DM core to emulate zone append 3372 * operations with regular writes. 3373 */ 3374 DMDEBUG("Zone append operations will be emulated"); 3375 ti->emulate_zone_append = true; 3376 } 3377 3378 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 3379 ret = crypt_integrity_ctr(cc, ti); 3380 if (ret) 3381 goto bad; 3382 3383 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->tuple_size; 3384 if (!cc->tag_pool_max_sectors) 3385 cc->tag_pool_max_sectors = 1; 3386 3387 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, 3388 cc->tag_pool_max_sectors * cc->tuple_size); 3389 if (ret) { 3390 ti->error = "Cannot allocate integrity tags mempool"; 3391 goto bad; 3392 } 3393 3394 cc->tag_pool_max_sectors <<= cc->sector_shift; 3395 } 3396 3397 wq_id = ida_alloc_min(&workqueue_ida, 1, GFP_KERNEL); 3398 if (wq_id < 0) { 3399 ti->error = "Couldn't get workqueue id"; 3400 ret = wq_id; 3401 goto bad; 3402 } 3403 cc->workqueue_id = wq_id; 3404 3405 ret = -ENOMEM; 3406 common_wq_flags = WQ_MEM_RECLAIM | WQ_SYSFS; 3407 if (test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags)) 3408 common_wq_flags |= WQ_HIGHPRI; 3409 3410 cc->io_queue = alloc_workqueue("kcryptd_io-%s-%d", common_wq_flags, 1, devname, wq_id); 3411 if (!cc->io_queue) { 3412 ti->error = "Couldn't create kcryptd io queue"; 3413 goto bad; 3414 } 3415 3416 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) { 3417 cc->crypt_queue = alloc_workqueue("kcryptd-%s-%d", 3418 common_wq_flags | WQ_CPU_INTENSIVE, 3419 1, devname, wq_id); 3420 } else { 3421 /* 3422 * While crypt_queue is certainly CPU intensive, the use of 3423 * WQ_CPU_INTENSIVE is meaningless with WQ_UNBOUND. 3424 */ 3425 cc->crypt_queue = alloc_workqueue("kcryptd-%s-%d", 3426 common_wq_flags | WQ_UNBOUND, 3427 num_online_cpus(), devname, wq_id); 3428 } 3429 if (!cc->crypt_queue) { 3430 ti->error = "Couldn't create kcryptd queue"; 3431 goto bad; 3432 } 3433 3434 spin_lock_init(&cc->write_thread_lock); 3435 cc->write_tree = RB_ROOT; 3436 3437 cc->write_thread = kthread_run(dmcrypt_write, cc, "dmcrypt_write/%s", devname); 3438 if (IS_ERR(cc->write_thread)) { 3439 ret = PTR_ERR(cc->write_thread); 3440 cc->write_thread = NULL; 3441 ti->error = "Couldn't spawn write thread"; 3442 goto bad; 3443 } 3444 if (test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags)) 3445 set_user_nice(cc->write_thread, MIN_NICE); 3446 3447 ti->num_flush_bios = 1; 3448 ti->limit_swap_bios = true; 3449 ti->accounts_remapped_io = true; 3450 3451 dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1); 3452 return 0; 3453 3454 bad: 3455 dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0); 3456 crypt_dtr(ti); 3457 return ret; 3458 } 3459 3460 static int crypt_map(struct dm_target *ti, struct bio *bio) 3461 { 3462 struct dm_crypt_io *io; 3463 struct crypt_config *cc = ti->private; 3464 unsigned max_sectors; 3465 3466 /* 3467 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 3468 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 3469 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 3470 */ 3471 if (unlikely(bio->bi_opf & REQ_PREFLUSH || 3472 bio_op(bio) == REQ_OP_DISCARD)) { 3473 bio_set_dev(bio, cc->dev->bdev); 3474 if (bio_sectors(bio)) 3475 bio->bi_iter.bi_sector = cc->start + 3476 dm_target_offset(ti, bio->bi_iter.bi_sector); 3477 return DM_MAPIO_REMAPPED; 3478 } 3479 3480 /* 3481 * Check if bio is too large, split as needed. 3482 */ 3483 max_sectors = get_max_request_sectors(ti, bio); 3484 if (unlikely(bio_sectors(bio) > max_sectors)) 3485 dm_accept_partial_bio(bio, max_sectors); 3486 3487 /* 3488 * Ensure that bio is a multiple of internal sector encryption size 3489 * and is aligned to this size as defined in IO hints. 3490 */ 3491 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) 3492 return DM_MAPIO_KILL; 3493 3494 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) 3495 return DM_MAPIO_KILL; 3496 3497 io = dm_per_bio_data(bio, cc->per_bio_data_size); 3498 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 3499 3500 if (cc->tuple_size) { 3501 unsigned int tag_len = cc->tuple_size * (bio_sectors(bio) >> cc->sector_shift); 3502 3503 if (unlikely(tag_len > KMALLOC_MAX_SIZE)) 3504 io->integrity_metadata = NULL; 3505 else 3506 io->integrity_metadata = kmalloc(tag_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); 3507 3508 if (unlikely(!io->integrity_metadata)) { 3509 if (bio_sectors(bio) > cc->tag_pool_max_sectors) 3510 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 3511 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); 3512 io->integrity_metadata_from_pool = true; 3513 } 3514 } 3515 3516 if (crypt_integrity_aead(cc)) 3517 io->ctx.r.req_aead = (struct aead_request *)(io + 1); 3518 else 3519 io->ctx.r.req = (struct skcipher_request *)(io + 1); 3520 3521 if (bio_data_dir(io->base_bio) == READ) { 3522 if (kcryptd_io_read(io, CRYPT_MAP_READ_GFP)) 3523 kcryptd_queue_read(io); 3524 } else 3525 kcryptd_queue_crypt(io); 3526 3527 return DM_MAPIO_SUBMITTED; 3528 } 3529 3530 static char hex2asc(unsigned char c) 3531 { 3532 return c + '0' + ((unsigned int)(9 - c) >> 4 & 0x27); 3533 } 3534 3535 static void crypt_status(struct dm_target *ti, status_type_t type, 3536 unsigned int status_flags, char *result, unsigned int maxlen) 3537 { 3538 struct crypt_config *cc = ti->private; 3539 unsigned int i, sz = 0; 3540 int num_feature_args = 0; 3541 3542 switch (type) { 3543 case STATUSTYPE_INFO: 3544 result[0] = '\0'; 3545 break; 3546 3547 case STATUSTYPE_TABLE: 3548 DMEMIT("%s ", cc->cipher_string); 3549 3550 if (cc->key_size > 0) { 3551 if (cc->key_string) 3552 DMEMIT(":%u:%s", cc->key_size, cc->key_string); 3553 else { 3554 for (i = 0; i < cc->key_size; i++) { 3555 DMEMIT("%c%c", hex2asc(cc->key[i] >> 4), 3556 hex2asc(cc->key[i] & 0xf)); 3557 } 3558 } 3559 } else 3560 DMEMIT("-"); 3561 3562 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 3563 cc->dev->name, (unsigned long long)cc->start); 3564 3565 num_feature_args += !!ti->num_discard_bios; 3566 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 3567 num_feature_args += test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags); 3568 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 3569 num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 3570 num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3571 num_feature_args += !!cc->used_tag_size; 3572 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); 3573 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3574 num_feature_args += test_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags); 3575 if (num_feature_args) { 3576 DMEMIT(" %d", num_feature_args); 3577 if (ti->num_discard_bios) 3578 DMEMIT(" allow_discards"); 3579 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 3580 DMEMIT(" same_cpu_crypt"); 3581 if (test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags)) 3582 DMEMIT(" high_priority"); 3583 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 3584 DMEMIT(" submit_from_crypt_cpus"); 3585 if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) 3586 DMEMIT(" no_read_workqueue"); 3587 if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) 3588 DMEMIT(" no_write_workqueue"); 3589 if (cc->used_tag_size) 3590 DMEMIT(" integrity:%u:%s", cc->used_tag_size, cc->cipher_auth); 3591 if (cc->sector_size != (1 << SECTOR_SHIFT)) 3592 DMEMIT(" sector_size:%d", cc->sector_size); 3593 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 3594 DMEMIT(" iv_large_sectors"); 3595 if (test_bit(CRYPT_KEY_MAC_SIZE_SET, &cc->cipher_flags)) 3596 DMEMIT(" integrity_key_size:%u", cc->key_mac_size); 3597 } 3598 break; 3599 3600 case STATUSTYPE_IMA: 3601 DMEMIT_TARGET_NAME_VERSION(ti->type); 3602 DMEMIT(",allow_discards=%c", ti->num_discard_bios ? 'y' : 'n'); 3603 DMEMIT(",same_cpu_crypt=%c", test_bit(DM_CRYPT_SAME_CPU, &cc->flags) ? 'y' : 'n'); 3604 DMEMIT(",high_priority=%c", test_bit(DM_CRYPT_HIGH_PRIORITY, &cc->flags) ? 'y' : 'n'); 3605 DMEMIT(",submit_from_crypt_cpus=%c", test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags) ? 3606 'y' : 'n'); 3607 DMEMIT(",no_read_workqueue=%c", test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags) ? 3608 'y' : 'n'); 3609 DMEMIT(",no_write_workqueue=%c", test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags) ? 3610 'y' : 'n'); 3611 DMEMIT(",iv_large_sectors=%c", test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags) ? 3612 'y' : 'n'); 3613 3614 if (cc->used_tag_size) 3615 DMEMIT(",integrity_tag_size=%u,cipher_auth=%s", 3616 cc->used_tag_size, cc->cipher_auth); 3617 if (cc->sector_size != (1 << SECTOR_SHIFT)) 3618 DMEMIT(",sector_size=%d", cc->sector_size); 3619 if (cc->cipher_string) 3620 DMEMIT(",cipher_string=%s", cc->cipher_string); 3621 3622 DMEMIT(",key_size=%u", cc->key_size); 3623 DMEMIT(",key_parts=%u", cc->key_parts); 3624 DMEMIT(",key_extra_size=%u", cc->key_extra_size); 3625 DMEMIT(",key_mac_size=%u", cc->key_mac_size); 3626 DMEMIT(";"); 3627 break; 3628 } 3629 } 3630 3631 static void crypt_postsuspend(struct dm_target *ti) 3632 { 3633 struct crypt_config *cc = ti->private; 3634 3635 set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3636 } 3637 3638 static int crypt_preresume(struct dm_target *ti) 3639 { 3640 struct crypt_config *cc = ti->private; 3641 3642 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 3643 DMERR("aborting resume - crypt key is not set."); 3644 return -EAGAIN; 3645 } 3646 3647 return 0; 3648 } 3649 3650 static void crypt_resume(struct dm_target *ti) 3651 { 3652 struct crypt_config *cc = ti->private; 3653 3654 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3655 } 3656 3657 /* Message interface 3658 * key set <key> 3659 * key wipe 3660 */ 3661 static int crypt_message(struct dm_target *ti, unsigned int argc, char **argv, 3662 char *result, unsigned int maxlen) 3663 { 3664 struct crypt_config *cc = ti->private; 3665 int key_size, ret = -EINVAL; 3666 3667 if (argc < 2) 3668 goto error; 3669 3670 if (!strcasecmp(argv[0], "key")) { 3671 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 3672 DMWARN("not suspended during key manipulation."); 3673 return -EINVAL; 3674 } 3675 if (argc == 3 && !strcasecmp(argv[1], "set")) { 3676 /* The key size may not be changed. */ 3677 key_size = get_key_size(&argv[2]); 3678 if (key_size < 0 || cc->key_size != key_size) { 3679 memset(argv[2], '0', strlen(argv[2])); 3680 return -EINVAL; 3681 } 3682 3683 ret = crypt_set_key(cc, argv[2]); 3684 if (ret) 3685 return ret; 3686 if (cc->iv_gen_ops && cc->iv_gen_ops->init) 3687 ret = cc->iv_gen_ops->init(cc); 3688 /* wipe the kernel key payload copy */ 3689 if (cc->key_string) 3690 memset(cc->key, 0, cc->key_size * sizeof(u8)); 3691 return ret; 3692 } 3693 if (argc == 2 && !strcasecmp(argv[1], "wipe")) 3694 return crypt_wipe_key(cc); 3695 } 3696 3697 error: 3698 DMWARN("unrecognised message received."); 3699 return -EINVAL; 3700 } 3701 3702 static int crypt_iterate_devices(struct dm_target *ti, 3703 iterate_devices_callout_fn fn, void *data) 3704 { 3705 struct crypt_config *cc = ti->private; 3706 3707 return fn(ti, cc->dev, cc->start, ti->len, data); 3708 } 3709 3710 static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 3711 { 3712 struct crypt_config *cc = ti->private; 3713 3714 limits->logical_block_size = 3715 max_t(unsigned int, limits->logical_block_size, cc->sector_size); 3716 limits->physical_block_size = 3717 max_t(unsigned int, limits->physical_block_size, cc->sector_size); 3718 limits->io_min = max_t(unsigned int, limits->io_min, cc->sector_size); 3719 limits->dma_alignment = limits->logical_block_size - 1; 3720 3721 /* 3722 * For zoned dm-crypt targets, there will be no internal splitting of 3723 * write BIOs to avoid exceeding BIO_MAX_VECS vectors per BIO. But 3724 * without respecting this limit, crypt_alloc_buffer() will trigger a 3725 * BUG(). Avoid this by forcing DM core to split write BIOs to this 3726 * limit. 3727 */ 3728 if (ti->emulate_zone_append) 3729 limits->max_hw_sectors = min(limits->max_hw_sectors, 3730 BIO_MAX_VECS << PAGE_SECTORS_SHIFT); 3731 } 3732 3733 static struct target_type crypt_target = { 3734 .name = "crypt", 3735 .version = {1, 28, 0}, 3736 .module = THIS_MODULE, 3737 .ctr = crypt_ctr, 3738 .dtr = crypt_dtr, 3739 .features = DM_TARGET_ZONED_HM, 3740 .report_zones = crypt_report_zones, 3741 .map = crypt_map, 3742 .status = crypt_status, 3743 .postsuspend = crypt_postsuspend, 3744 .preresume = crypt_preresume, 3745 .resume = crypt_resume, 3746 .message = crypt_message, 3747 .iterate_devices = crypt_iterate_devices, 3748 .io_hints = crypt_io_hints, 3749 }; 3750 module_dm(crypt); 3751 3752 MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 3753 MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 3754 MODULE_LICENSE("GPL"); 3755