| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Milan Broz | 11510 | 75.25% | 63 | 33.69% |
| Mikulas Patocka | 1260 | 8.24% | 27 | 14.44% |
| Andrew Morton | 588 | 3.84% | 5 | 2.67% |
| Ondrej Kozina | 412 | 2.69% | 6 | 3.21% |
| Alasdair G. Kergon | 412 | 2.69% | 12 | 6.42% |
| Andi Kleen | 312 | 2.04% | 1 | 0.53% |
| Rik Snel | 140 | 0.92% | 1 | 0.53% |
| Mike Snitzer | 118 | 0.77% | 8 | 4.28% |
| Kent Overstreet | 85 | 0.56% | 6 | 3.21% |
| Herbert Xu | 69 | 0.45% | 4 | 2.14% |
| Eric Biggers | 45 | 0.29% | 4 | 2.14% |
| Huang Ying | 42 | 0.27% | 1 | 0.53% |
| Ludwig Nussel | 37 | 0.24% | 1 | 0.53% |
| Christoph Hellwig | 34 | 0.22% | 6 | 3.21% |
| Kees Cook | 29 | 0.19% | 2 | 1.07% |
| Michał Mirosław | 24 | 0.16% | 1 | 0.53% |
| Rabin Vincent | 20 | 0.13% | 2 | 1.07% |
| Olaf Kirch | 18 | 0.12% | 2 | 1.07% |
| Ard Biesheuvel | 16 | 0.10% | 1 | 0.53% |
| Jens Axboe | 15 | 0.10% | 4 | 2.14% |
| Stefan Rompf | 13 | 0.08% | 1 | 0.53% |
| Jan-Simon Möller | 10 | 0.07% | 1 | 0.53% |
| Michael Christie | 9 | 0.06% | 2 | 1.07% |
| Tim Murray | 8 | 0.05% | 1 | 0.53% |
| Julia Lawall | 8 | 0.05% | 1 | 0.53% |
| Jianpeng Ma | 6 | 0.04% | 1 | 0.53% |
| Ming Lei | 5 | 0.03% | 1 | 0.53% |
| Jeffy Chen | 5 | 0.03% | 1 | 0.53% |
| Lars Marowsky-Bree | 5 | 0.03% | 1 | 0.53% |
| Wei Yongjun | 5 | 0.03% | 1 | 0.53% |
| Sasha Levin | 4 | 0.03% | 1 | 0.53% |
| David Howells | 3 | 0.02% | 2 | 1.07% |
| Dmitriy Monakhov | 3 | 0.02% | 1 | 0.53% |
| AliOS system security | 3 | 0.02% | 1 | 0.53% |
| Neil Brown | 3 | 0.02% | 2 | 1.07% |
| Benjamin Collins | 2 | 0.01% | 1 | 0.53% |
| Bart Van Assche | 2 | 0.01% | 1 | 0.53% |
| Tejun Heo | 2 | 0.01% | 1 | 0.53% |
| Vivek Goyal | 2 | 0.01% | 1 | 0.53% |
| Christophe Saout | 2 | 0.01% | 1 | 0.53% |
| Arun K S | 2 | 0.01% | 1 | 0.53% |
| Andy Shevchenko | 2 | 0.01% | 1 | 0.53% |
| Lei Ming | 1 | 0.01% | 1 | 0.53% |
| Arun Sharma | 1 | 0.01% | 1 | 0.53% |
| David Härdeman | 1 | 0.01% | 1 | 0.53% |
| Kiyoshi Ueda | 1 | 0.01% | 1 | 0.53% |
| Jana Saout | 1 | 0.01% | 1 | 0.53% |
| Total | 15295 | 187 |
/* * Copyright (C) 2003 Jana Saout <jana@saout.de> * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved. * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com> * * This file is released under the GPL. */ #include <linux/completion.h> #include <linux/err.h> #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/key.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/mempool.h> #include <linux/slab.h> #include <linux/crypto.h> #include <linux/workqueue.h> #include <linux/kthread.h> #include <linux/backing-dev.h> #include <linux/atomic.h> #include <linux/scatterlist.h> #include <linux/rbtree.h> #include <linux/ctype.h> #include <asm/page.h> #include <asm/unaligned.h> #include <crypto/hash.h> #include <crypto/md5.h> #include <crypto/algapi.h> #include <crypto/skcipher.h> #include <crypto/aead.h> #include <crypto/authenc.h> #include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */ #include <keys/user-type.h> #include <linux/device-mapper.h> #define DM_MSG_PREFIX "crypt" /* * context holding the current state of a multi-part conversion */ struct convert_context { struct completion restart; struct bio *bio_in; struct bio *bio_out; struct bvec_iter iter_in; struct bvec_iter iter_out; u64 cc_sector; atomic_t cc_pending; union { struct skcipher_request *req; struct aead_request *req_aead; } r; }; /* * per bio private data */ struct dm_crypt_io { struct crypt_config *cc; struct bio *base_bio; u8 *integrity_metadata; bool integrity_metadata_from_pool; struct work_struct work; struct convert_context ctx; atomic_t io_pending; blk_status_t error; sector_t sector; struct rb_node rb_node; } CRYPTO_MINALIGN_ATTR; struct dm_crypt_request { struct convert_context *ctx; struct scatterlist sg_in[4]; struct scatterlist sg_out[4]; u64 iv_sector; }; struct crypt_config; struct crypt_iv_operations { int (*ctr)(struct crypt_config *cc, struct dm_target *ti, const char *opts); void (*dtr)(struct crypt_config *cc); int (*init)(struct crypt_config *cc); int (*wipe)(struct crypt_config *cc); int (*generator)(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq); int (*post)(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq); }; struct iv_essiv_private { struct crypto_shash *hash_tfm; u8 *salt; }; struct iv_benbi_private { int shift; }; #define LMK_SEED_SIZE 64 /* hash + 0 */ struct iv_lmk_private { struct crypto_shash *hash_tfm; u8 *seed; }; #define TCW_WHITENING_SIZE 16 struct iv_tcw_private { struct crypto_shash *crc32_tfm; u8 *iv_seed; u8 *whitening; }; /* * Crypt: maps a linear range of a block device * and encrypts / decrypts at the same time. */ enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; enum cipher_flags { CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */ CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ }; /* * The fields in here must be read only after initialization. */ struct crypt_config { struct dm_dev *dev; sector_t start; struct percpu_counter n_allocated_pages; struct workqueue_struct *io_queue; struct workqueue_struct *crypt_queue; spinlock_t write_thread_lock; struct task_struct *write_thread; struct rb_root write_tree; char *cipher; char *cipher_string; char *cipher_auth; char *key_string; const struct crypt_iv_operations *iv_gen_ops; union { struct iv_essiv_private essiv; struct iv_benbi_private benbi; struct iv_lmk_private lmk; struct iv_tcw_private tcw; } iv_gen_private; u64 iv_offset; unsigned int iv_size; unsigned short int sector_size; unsigned char sector_shift; /* ESSIV: struct crypto_cipher *essiv_tfm */ void *iv_private; union { struct crypto_skcipher **tfms; struct crypto_aead **tfms_aead; } cipher_tfm; unsigned tfms_count; unsigned long cipher_flags; /* * Layout of each crypto request: * * struct skcipher_request * context * padding * struct dm_crypt_request * padding * IV * * The padding is added so that dm_crypt_request and the IV are * correctly aligned. */ unsigned int dmreq_start; unsigned int per_bio_data_size; unsigned long flags; unsigned int key_size; unsigned int key_parts; /* independent parts in key buffer */ unsigned int key_extra_size; /* additional keys length */ unsigned int key_mac_size; /* MAC key size for authenc(...) */ unsigned int integrity_tag_size; unsigned int integrity_iv_size; unsigned int on_disk_tag_size; /* * pool for per bio private data, crypto requests, * encryption requeusts/buffer pages and integrity tags */ unsigned tag_pool_max_sectors; mempool_t tag_pool; mempool_t req_pool; mempool_t page_pool; struct bio_set bs; struct mutex bio_alloc_lock; u8 *authenc_key; /* space for keys in authenc() format (if used) */ u8 key[0]; }; #define MIN_IOS 64 #define MAX_TAG_SIZE 480 #define POOL_ENTRY_SIZE 512 static DEFINE_SPINLOCK(dm_crypt_clients_lock); static unsigned dm_crypt_clients_n = 0; static volatile unsigned long dm_crypt_pages_per_client; #define DM_CRYPT_MEMORY_PERCENT 2 #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_PAGES * 16) static void clone_init(struct dm_crypt_io *, struct bio *); static void kcryptd_queue_crypt(struct dm_crypt_io *io); static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, struct scatterlist *sg); /* * Use this to access cipher attributes that are independent of the key. */ static struct crypto_skcipher *any_tfm(struct crypt_config *cc) { return cc->cipher_tfm.tfms[0]; } static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) { return cc->cipher_tfm.tfms_aead[0]; } /* * Different IV generation algorithms: * * plain: the initial vector is the 32-bit little-endian version of the sector * number, padded with zeros if necessary. * * plain64: the initial vector is the 64-bit little-endian version of the sector * number, padded with zeros if necessary. * * plain64be: the initial vector is the 64-bit big-endian version of the sector * number, padded with zeros if necessary. * * essiv: "encrypted sector|salt initial vector", the sector number is * encrypted with the bulk cipher using a salt as key. The salt * should be derived from the bulk cipher's key via hashing. * * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 * (needed for LRW-32-AES and possible other narrow block modes) * * null: the initial vector is always zero. Provides compatibility with * obsolete loop_fish2 devices. Do not use for new devices. * * lmk: Compatible implementation of the block chaining mode used * by the Loop-AES block device encryption system * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ * It operates on full 512 byte sectors and uses CBC * with an IV derived from the sector number, the data and * optionally extra IV seed. * This means that after decryption the first block * of sector must be tweaked according to decrypted data. * Loop-AES can use three encryption schemes: * version 1: is plain aes-cbc mode * version 2: uses 64 multikey scheme with lmk IV generator * version 3: the same as version 2 with additional IV seed * (it uses 65 keys, last key is used as IV seed) * * tcw: Compatible implementation of the block chaining mode used * by the TrueCrypt device encryption system (prior to version 4.1). * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat * It operates on full 512 byte sectors and uses CBC * with an IV derived from initial key and the sector number. * In addition, whitening value is applied on every sector, whitening * is calculated from initial key, sector number and mixed using CRC32. * Note that this encryption scheme is vulnerable to watermarking attacks * and should be used for old compatible containers access only. * * plumb: unimplemented, see: * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 */ static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { memset(iv, 0, cc->iv_size); *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); return 0; } static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { memset(iv, 0, cc->iv_size); *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); return 0; } static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { memset(iv, 0, cc->iv_size); /* iv_size is at least of size u64; usually it is 16 bytes */ *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); return 0; } /* Initialise ESSIV - compute salt but no local memory allocations */ static int crypt_iv_essiv_init(struct crypt_config *cc) { struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; SHASH_DESC_ON_STACK(desc, essiv->hash_tfm); struct crypto_cipher *essiv_tfm; int err; desc->tfm = essiv->hash_tfm; err = crypto_shash_digest(desc, cc->key, cc->key_size, essiv->salt); shash_desc_zero(desc); if (err) return err; essiv_tfm = cc->iv_private; err = crypto_cipher_setkey(essiv_tfm, essiv->salt, crypto_shash_digestsize(essiv->hash_tfm)); if (err) return err; return 0; } /* Wipe salt and reset key derived from volume key */ static int crypt_iv_essiv_wipe(struct crypt_config *cc) { struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; unsigned salt_size = crypto_shash_digestsize(essiv->hash_tfm); struct crypto_cipher *essiv_tfm; int r, err = 0; memset(essiv->salt, 0, salt_size); essiv_tfm = cc->iv_private; r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); if (r) err = r; return err; } /* Allocate the cipher for ESSIV */ static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc, struct dm_target *ti, const u8 *salt, unsigned int saltsize) { struct crypto_cipher *essiv_tfm; int err; /* Setup the essiv_tfm with the given salt */ essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, 0); if (IS_ERR(essiv_tfm)) { ti->error = "Error allocating crypto tfm for ESSIV"; return essiv_tfm; } if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) { ti->error = "Block size of ESSIV cipher does " "not match IV size of block cipher"; crypto_free_cipher(essiv_tfm); return ERR_PTR(-EINVAL); } err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); if (err) { ti->error = "Failed to set key for ESSIV cipher"; crypto_free_cipher(essiv_tfm); return ERR_PTR(err); } return essiv_tfm; } static void crypt_iv_essiv_dtr(struct crypt_config *cc) { struct crypto_cipher *essiv_tfm; struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; crypto_free_shash(essiv->hash_tfm); essiv->hash_tfm = NULL; kzfree(essiv->salt); essiv->salt = NULL; essiv_tfm = cc->iv_private; if (essiv_tfm) crypto_free_cipher(essiv_tfm); cc->iv_private = NULL; } static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { struct crypto_cipher *essiv_tfm = NULL; struct crypto_shash *hash_tfm = NULL; u8 *salt = NULL; int err; if (!opts) { ti->error = "Digest algorithm missing for ESSIV mode"; return -EINVAL; } /* Allocate hash algorithm */ hash_tfm = crypto_alloc_shash(opts, 0, 0); if (IS_ERR(hash_tfm)) { ti->error = "Error initializing ESSIV hash"; err = PTR_ERR(hash_tfm); goto bad; } salt = kzalloc(crypto_shash_digestsize(hash_tfm), GFP_KERNEL); if (!salt) { ti->error = "Error kmallocing salt storage in ESSIV"; err = -ENOMEM; goto bad; } cc->iv_gen_private.essiv.salt = salt; cc->iv_gen_private.essiv.hash_tfm = hash_tfm; essiv_tfm = alloc_essiv_cipher(cc, ti, salt, crypto_shash_digestsize(hash_tfm)); if (IS_ERR(essiv_tfm)) { crypt_iv_essiv_dtr(cc); return PTR_ERR(essiv_tfm); } cc->iv_private = essiv_tfm; return 0; bad: if (hash_tfm && !IS_ERR(hash_tfm)) crypto_free_shash(hash_tfm); kfree(salt); return err; } static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { struct crypto_cipher *essiv_tfm = cc->iv_private; memset(iv, 0, cc->iv_size); *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); crypto_cipher_encrypt_one(essiv_tfm, iv, iv); return 0; } static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); int log = ilog2(bs); /* we need to calculate how far we must shift the sector count * to get the cipher block count, we use this shift in _gen */ if (1 << log != bs) { ti->error = "cypher blocksize is not a power of 2"; return -EINVAL; } if (log > 9) { ti->error = "cypher blocksize is > 512"; return -EINVAL; } cc->iv_gen_private.benbi.shift = 9 - log; return 0; } static void crypt_iv_benbi_dtr(struct crypt_config *cc) { } static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { __be64 val; memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); return 0; } static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { memset(iv, 0, cc->iv_size); return 0; } static void crypt_iv_lmk_dtr(struct crypt_config *cc) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) crypto_free_shash(lmk->hash_tfm); lmk->hash_tfm = NULL; kzfree(lmk->seed); lmk->seed = NULL; } static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; if (cc->sector_size != (1 << SECTOR_SHIFT)) { ti->error = "Unsupported sector size for LMK"; return -EINVAL; } lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); if (IS_ERR(lmk->hash_tfm)) { ti->error = "Error initializing LMK hash"; return PTR_ERR(lmk->hash_tfm); } /* No seed in LMK version 2 */ if (cc->key_parts == cc->tfms_count) { lmk->seed = NULL; return 0; } lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); if (!lmk->seed) { crypt_iv_lmk_dtr(cc); ti->error = "Error kmallocing seed storage in LMK"; return -ENOMEM; } return 0; } static int crypt_iv_lmk_init(struct crypt_config *cc) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; int subkey_size = cc->key_size / cc->key_parts; /* LMK seed is on the position of LMK_KEYS + 1 key */ if (lmk->seed) memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), crypto_shash_digestsize(lmk->hash_tfm)); return 0; } static int crypt_iv_lmk_wipe(struct crypt_config *cc) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; if (lmk->seed) memset(lmk->seed, 0, LMK_SEED_SIZE); return 0; } static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq, u8 *data) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); struct md5_state md5state; __le32 buf[4]; int i, r; desc->tfm = lmk->hash_tfm; r = crypto_shash_init(desc); if (r) return r; if (lmk->seed) { r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); if (r) return r; } /* Sector is always 512B, block size 16, add data of blocks 1-31 */ r = crypto_shash_update(desc, data + 16, 16 * 31); if (r) return r; /* Sector is cropped to 56 bits here */ buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); buf[2] = cpu_to_le32(4024); buf[3] = 0; r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); if (r) return r; /* No MD5 padding here */ r = crypto_shash_export(desc, &md5state); if (r) return r; for (i = 0; i < MD5_HASH_WORDS; i++) __cpu_to_le32s(&md5state.hash[i]); memcpy(iv, &md5state.hash, cc->iv_size); return 0; } static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { struct scatterlist *sg; u8 *src; int r = 0; if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { sg = crypt_get_sg_data(cc, dmreq->sg_in); src = kmap_atomic(sg_page(sg)); r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); kunmap_atomic(src); } else memset(iv, 0, cc->iv_size); return r; } static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { struct scatterlist *sg; u8 *dst; int r; if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) return 0; sg = crypt_get_sg_data(cc, dmreq->sg_out); dst = kmap_atomic(sg_page(sg)); r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); /* Tweak the first block of plaintext sector */ if (!r) crypto_xor(dst + sg->offset, iv, cc->iv_size); kunmap_atomic(dst); return r; } static void crypt_iv_tcw_dtr(struct crypt_config *cc) { struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; kzfree(tcw->iv_seed); tcw->iv_seed = NULL; kzfree(tcw->whitening); tcw->whitening = NULL; if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) crypto_free_shash(tcw->crc32_tfm); tcw->crc32_tfm = NULL; } static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; if (cc->sector_size != (1 << SECTOR_SHIFT)) { ti->error = "Unsupported sector size for TCW"; return -EINVAL; } if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { ti->error = "Wrong key size for TCW"; return -EINVAL; } tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); if (IS_ERR(tcw->crc32_tfm)) { ti->error = "Error initializing CRC32 in TCW"; return PTR_ERR(tcw->crc32_tfm); } tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); if (!tcw->iv_seed || !tcw->whitening) { crypt_iv_tcw_dtr(cc); ti->error = "Error allocating seed storage in TCW"; return -ENOMEM; } return 0; } static int crypt_iv_tcw_init(struct crypt_config *cc) { struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], TCW_WHITENING_SIZE); return 0; } static int crypt_iv_tcw_wipe(struct crypt_config *cc) { struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; memset(tcw->iv_seed, 0, cc->iv_size); memset(tcw->whitening, 0, TCW_WHITENING_SIZE); return 0; } static int crypt_iv_tcw_whitening(struct crypt_config *cc, struct dm_crypt_request *dmreq, u8 *data) { struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; __le64 sector = cpu_to_le64(dmreq->iv_sector); u8 buf[TCW_WHITENING_SIZE]; SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); int i, r; /* xor whitening with sector number */ crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); /* calculate crc32 for every 32bit part and xor it */ desc->tfm = tcw->crc32_tfm; for (i = 0; i < 4; i++) { r = crypto_shash_init(desc); if (r) goto out; r = crypto_shash_update(desc, &buf[i * 4], 4); if (r) goto out; r = crypto_shash_final(desc, &buf[i * 4]); if (r) goto out; } crypto_xor(&buf[0], &buf[12], 4); crypto_xor(&buf[4], &buf[8], 4); /* apply whitening (8 bytes) to whole sector */ for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) crypto_xor(data + i * 8, buf, 8); out: memzero_explicit(buf, sizeof(buf)); return r; } static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { struct scatterlist *sg; struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; __le64 sector = cpu_to_le64(dmreq->iv_sector); u8 *src; int r = 0; /* Remove whitening from ciphertext */ if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { sg = crypt_get_sg_data(cc, dmreq->sg_in); src = kmap_atomic(sg_page(sg)); r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); kunmap_atomic(src); } /* Calculate IV */ crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); if (cc->iv_size > 8) crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, cc->iv_size - 8); return r; } static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { struct scatterlist *sg; u8 *dst; int r; if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) return 0; /* Apply whitening on ciphertext */ sg = crypt_get_sg_data(cc, dmreq->sg_out); dst = kmap_atomic(sg_page(sg)); r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); kunmap_atomic(dst); return r; } static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { /* Used only for writes, there must be an additional space to store IV */ get_random_bytes(iv, cc->iv_size); return 0; } static const struct crypt_iv_operations crypt_iv_plain_ops = { .generator = crypt_iv_plain_gen }; static const struct crypt_iv_operations crypt_iv_plain64_ops = { .generator = crypt_iv_plain64_gen }; static const struct crypt_iv_operations crypt_iv_plain64be_ops = { .generator = crypt_iv_plain64be_gen }; static const struct crypt_iv_operations crypt_iv_essiv_ops = { .ctr = crypt_iv_essiv_ctr, .dtr = crypt_iv_essiv_dtr, .init = crypt_iv_essiv_init, .wipe = crypt_iv_essiv_wipe, .generator = crypt_iv_essiv_gen }; static const struct crypt_iv_operations crypt_iv_benbi_ops = { .ctr = crypt_iv_benbi_ctr, .dtr = crypt_iv_benbi_dtr, .generator = crypt_iv_benbi_gen }; static const struct crypt_iv_operations crypt_iv_null_ops = { .generator = crypt_iv_null_gen }; static const struct crypt_iv_operations crypt_iv_lmk_ops = { .ctr = crypt_iv_lmk_ctr, .dtr = crypt_iv_lmk_dtr, .init = crypt_iv_lmk_init, .wipe = crypt_iv_lmk_wipe, .generator = crypt_iv_lmk_gen, .post = crypt_iv_lmk_post }; static const struct crypt_iv_operations crypt_iv_tcw_ops = { .ctr = crypt_iv_tcw_ctr, .dtr = crypt_iv_tcw_dtr, .init = crypt_iv_tcw_init, .wipe = crypt_iv_tcw_wipe, .generator = crypt_iv_tcw_gen, .post = crypt_iv_tcw_post }; static struct crypt_iv_operations crypt_iv_random_ops = { .generator = crypt_iv_random_gen }; /* * Integrity extensions */ static bool crypt_integrity_aead(struct crypt_config *cc) { return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); } static bool crypt_integrity_hmac(struct crypt_config *cc) { return crypt_integrity_aead(cc) && cc->key_mac_size; } /* Get sg containing data */ static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, struct scatterlist *sg) { if (unlikely(crypt_integrity_aead(cc))) return &sg[2]; return sg; } static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) { struct bio_integrity_payload *bip; unsigned int tag_len; int ret; if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) return 0; bip = bio_integrity_alloc(bio, GFP_NOIO, 1); if (IS_ERR(bip)) return PTR_ERR(bip); tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift); bip->bip_iter.bi_size = tag_len; bip->bip_iter.bi_sector = io->cc->start + io->sector; ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), tag_len, offset_in_page(io->integrity_metadata)); if (unlikely(ret != tag_len)) return -ENOMEM; return 0; } static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) { #ifdef CONFIG_BLK_DEV_INTEGRITY struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); struct mapped_device *md = dm_table_get_md(ti->table); /* From now we require underlying device with our integrity profile */ if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { ti->error = "Integrity profile not supported."; return -EINVAL; } if (bi->tag_size != cc->on_disk_tag_size || bi->tuple_size != cc->on_disk_tag_size) { ti->error = "Integrity profile tag size mismatch."; return -EINVAL; } if (1 << bi->interval_exp != cc->sector_size) { ti->error = "Integrity profile sector size mismatch."; return -EINVAL; } if (crypt_integrity_aead(cc)) { cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), cc->integrity_tag_size, cc->integrity_iv_size); if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { ti->error = "Integrity AEAD auth tag size is not supported."; return -EINVAL; } } else if (cc->integrity_iv_size) DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), cc->integrity_iv_size); if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { ti->error = "Not enough space for integrity tag in the profile."; return -EINVAL; } return 0; #else ti->error = "Integrity profile not supported."; return -EINVAL; #endif } static void crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, struct bio *bio_out, struct bio *bio_in, sector_t sector) { ctx->bio_in = bio_in; ctx->bio_out = bio_out; if (bio_in) ctx->iter_in = bio_in->bi_iter; if (bio_out) ctx->iter_out = bio_out->bi_iter; ctx->cc_sector = sector + cc->iv_offset; init_completion(&ctx->restart); } static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, void *req) { return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); } static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { return (void *)((char *)dmreq - cc->dmreq_start); } static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { if (crypt_integrity_aead(cc)) return (u8 *)ALIGN((unsigned long)(dmreq + 1), crypto_aead_alignmask(any_tfm_aead(cc)) + 1); else return (u8 *)ALIGN((unsigned long)(dmreq + 1), crypto_skcipher_alignmask(any_tfm(cc)) + 1); } static u8 *org_iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { return iv_of_dmreq(cc, dmreq) + cc->iv_size; } static __le64 *org_sector_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; return (__le64 *) ptr; } static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size + sizeof(uint64_t); return (unsigned int*)ptr; } static void *tag_from_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { struct convert_context *ctx = dmreq->ctx; struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * cc->on_disk_tag_size]; } static void *iv_tag_from_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; } static int crypt_convert_block_aead(struct crypt_config *cc, struct convert_context *ctx, struct aead_request *req, unsigned int tag_offset) { struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); struct dm_crypt_request *dmreq; u8 *iv, *org_iv, *tag_iv, *tag; __le64 *sector; int r = 0; BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); /* Reject unexpected unaligned bio. */ if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) return -EIO; dmreq = dmreq_of_req(cc, req); dmreq->iv_sector = ctx->cc_sector; if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) dmreq->iv_sector >>= cc->sector_shift; dmreq->ctx = ctx; *org_tag_of_dmreq(cc, dmreq) = tag_offset; sector = org_sector_of_dmreq(cc, dmreq); *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); iv = iv_of_dmreq(cc, dmreq); org_iv = org_iv_of_dmreq(cc, dmreq); tag = tag_from_dmreq(cc, dmreq); tag_iv = iv_tag_from_dmreq(cc, dmreq); /* AEAD request: * |----- AAD -------|------ DATA -------|-- AUTH TAG --| * | (authenticated) | (auth+encryption) | | * | sector_LE | IV | sector in/out | tag in/out | */ sg_init_table(dmreq->sg_in, 4); sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); sg_init_table(dmreq->sg_out, 4); sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); if (cc->iv_gen_ops) { /* For READs use IV stored in integrity metadata */ if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { memcpy(org_iv, tag_iv, cc->iv_size); } else { r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); if (r < 0) return r; /* Store generated IV in integrity metadata */ if (cc->integrity_iv_size) memcpy(tag_iv, org_iv, cc->iv_size); } /* Working copy of IV, to be modified in crypto API */ memcpy(iv, org_iv, cc->iv_size); } aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); if (bio_data_dir(ctx->bio_in) == WRITE) { aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, cc->sector_size, iv); r = crypto_aead_encrypt(req); if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); } else { aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, cc->sector_size + cc->integrity_tag_size, iv); r = crypto_aead_decrypt(req); } if (r == -EBADMSG) { char b[BDEVNAME_SIZE]; DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), (unsigned long long)le64_to_cpu(*sector)); } if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) r = cc->iv_gen_ops->post(cc, org_iv, dmreq); bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); return r; } static int crypt_convert_block_skcipher(struct crypt_config *cc, struct convert_context *ctx, struct skcipher_request *req, unsigned int tag_offset) { struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); struct scatterlist *sg_in, *sg_out; struct dm_crypt_request *dmreq; u8 *iv, *org_iv, *tag_iv; __le64 *sector; int r = 0; /* Reject unexpected unaligned bio. */ if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) return -EIO; dmreq = dmreq_of_req(cc, req); dmreq->iv_sector = ctx->cc_sector; if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) dmreq->iv_sector >>= cc->sector_shift; dmreq->ctx = ctx; *org_tag_of_dmreq(cc, dmreq) = tag_offset; iv = iv_of_dmreq(cc, dmreq); org_iv = org_iv_of_dmreq(cc, dmreq); tag_iv = iv_tag_from_dmreq(cc, dmreq); sector = org_sector_of_dmreq(cc, dmreq); *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); /* For skcipher we use only the first sg item */ sg_in = &dmreq->sg_in[0]; sg_out = &dmreq->sg_out[0]; sg_init_table(sg_in, 1); sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); sg_init_table(sg_out, 1); sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); if (cc->iv_gen_ops) { /* For READs use IV stored in integrity metadata */ if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { memcpy(org_iv, tag_iv, cc->integrity_iv_size); } else { r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); if (r < 0) return r; /* Store generated IV in integrity metadata */ if (cc->integrity_iv_size) memcpy(tag_iv, org_iv, cc->integrity_iv_size); } /* Working copy of IV, to be modified in crypto API */ memcpy(iv, org_iv, cc->iv_size); } skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); if (bio_data_dir(ctx->bio_in) == WRITE) r = crypto_skcipher_encrypt(req); else r = crypto_skcipher_decrypt(req); if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) r = cc->iv_gen_ops->post(cc, org_iv, dmreq); bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); return r; } static void kcryptd_async_done(struct crypto_async_request *async_req, int error); static void crypt_alloc_req_skcipher(struct crypt_config *cc, struct convert_context *ctx) { unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); if (!ctx->r.req) ctx->r.req = mempool_alloc(&cc->req_pool, GFP_NOIO); skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); /* * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs * requests if driver request queue is full. */ skcipher_request_set_callback(ctx->r.req, CRYPTO_TFM_REQ_MAY_BACKLOG, kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); } static void crypt_alloc_req_aead(struct crypt_config *cc, struct convert_context *ctx) { if (!ctx->r.req_aead) ctx->r.req_aead = mempool_alloc(&cc->req_pool, GFP_NOIO); aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); /* * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs * requests if driver request queue is full. */ aead_request_set_callback(ctx->r.req_aead, CRYPTO_TFM_REQ_MAY_BACKLOG, kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); } static void crypt_alloc_req(struct crypt_config *cc, struct convert_context *ctx) { if (crypt_integrity_aead(cc)) crypt_alloc_req_aead(cc, ctx); else crypt_alloc_req_skcipher(cc, ctx); } static void crypt_free_req_skcipher(struct crypt_config *cc, struct skcipher_request *req, struct bio *base_bio) { struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); if ((struct skcipher_request *)(io + 1) != req) mempool_free(req, &cc->req_pool); } static void crypt_free_req_aead(struct crypt_config *cc, struct aead_request *req, struct bio *base_bio) { struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); if ((struct aead_request *)(io + 1) != req) mempool_free(req, &cc->req_pool); } static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) { if (crypt_integrity_aead(cc)) crypt_free_req_aead(cc, req, base_bio); else crypt_free_req_skcipher(cc, req, base_bio); } /* * Encrypt / decrypt data from one bio to another one (can be the same one) */ static blk_status_t crypt_convert(struct crypt_config *cc, struct convert_context *ctx) { unsigned int tag_offset = 0; unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; int r; atomic_set(&ctx->cc_pending, 1); while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { crypt_alloc_req(cc, ctx); atomic_inc(&ctx->cc_pending); if (crypt_integrity_aead(cc)) r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); else r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); switch (r) { /* * The request was queued by a crypto driver * but the driver request queue is full, let's wait. */ case -EBUSY: wait_for_completion(&ctx->restart); reinit_completion(&ctx->restart); /* fall through */ /* * The request is queued and processed asynchronously, * completion function kcryptd_async_done() will be called. */ case -EINPROGRESS: ctx->r.req = NULL; ctx->cc_sector += sector_step; tag_offset++; continue; /* * The request was already processed (synchronously). */ case 0: atomic_dec(&ctx->cc_pending); ctx->cc_sector += sector_step; tag_offset++; cond_resched(); continue; /* * There was a data integrity error. */ case -EBADMSG: atomic_dec(&ctx->cc_pending); return BLK_STS_PROTECTION; /* * There was an error while processing the request. */ default: atomic_dec(&ctx->cc_pending); return BLK_STS_IOERR; } } return 0; } static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); /* * Generate a new unfragmented bio with the given size * This should never violate the device limitations (but only because * max_segment_size is being constrained to PAGE_SIZE). * * This function may be called concurrently. If we allocate from the mempool * concurrently, there is a possibility of deadlock. For example, if we have * mempool of 256 pages, two processes, each wanting 256, pages allocate from * the mempool concurrently, it may deadlock in a situation where both processes * have allocated 128 pages and the mempool is exhausted. * * In order to avoid this scenario we allocate the pages under a mutex. * * In order to not degrade performance with excessive locking, we try * non-blocking allocations without a mutex first but on failure we fallback * to blocking allocations with a mutex. */ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) { struct crypt_config *cc = io->cc; struct bio *clone; unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; unsigned i, len, remaining_size; struct page *page; retry: if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) mutex_lock(&cc->bio_alloc_lock); clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs); if (!clone) goto out; clone_init(io, clone); remaining_size = size; for (i = 0; i < nr_iovecs; i++) { page = mempool_alloc(&cc->page_pool, gfp_mask); if (!page) { crypt_free_buffer_pages(cc, clone); bio_put(clone); gfp_mask |= __GFP_DIRECT_RECLAIM; goto retry; } len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; bio_add_page(clone, page, len, 0); remaining_size -= len; } /* Allocate space for integrity tags */ if (dm_crypt_integrity_io_alloc(io, clone)) { crypt_free_buffer_pages(cc, clone); bio_put(clone); clone = NULL; } out: if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) mutex_unlock(&cc->bio_alloc_lock); return clone; } static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) { struct bio_vec *bv; struct bvec_iter_all iter_all; bio_for_each_segment_all(bv, clone, iter_all) { BUG_ON(!bv->bv_page); mempool_free(bv->bv_page, &cc->page_pool); } } static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, struct bio *bio, sector_t sector) { io->cc = cc; io->base_bio = bio; io->sector = sector; io->error = 0; io->ctx.r.req = NULL; io->integrity_metadata = NULL; io->integrity_metadata_from_pool = false; atomic_set(&io->io_pending, 0); } static void crypt_inc_pending(struct dm_crypt_io *io) { atomic_inc(&io->io_pending); } /* * One of the bios was finished. Check for completion of * the whole request and correctly clean up the buffer. */ static void crypt_dec_pending(struct dm_crypt_io *io) { struct crypt_config *cc = io->cc; struct bio *base_bio = io->base_bio; blk_status_t error = io->error; if (!atomic_dec_and_test(&io->io_pending)) return; if (io->ctx.r.req) crypt_free_req(cc, io->ctx.r.req, base_bio); if (unlikely(io->integrity_metadata_from_pool)) mempool_free(io->integrity_metadata, &io->cc->tag_pool); else kfree(io->integrity_metadata); base_bio->bi_status = error; bio_endio(base_bio); } /* * kcryptd/kcryptd_io: * * Needed because it would be very unwise to do decryption in an * interrupt context. * * kcryptd performs the actual encryption or decryption. * * kcryptd_io performs the IO submission. * * They must be separated as otherwise the final stages could be * starved by new requests which can block in the first stages due * to memory allocation. * * The work is done per CPU global for all dm-crypt instances. * They should not depend on each other and do not block. */ static void crypt_endio(struct bio *clone) { struct dm_crypt_io *io = clone->bi_private; struct crypt_config *cc = io->cc; unsigned rw = bio_data_dir(clone); blk_status_t error; /* * free the processed pages */ if (rw == WRITE) crypt_free_buffer_pages(cc, clone); error = clone->bi_status; bio_put(clone); if (rw == READ && !error) { kcryptd_queue_crypt(io); return; } if (unlikely(error)) io->error = error; crypt_dec_pending(io); } static void clone_init(struct dm_crypt_io *io, struct bio *clone) { struct crypt_config *cc = io->cc; clone->bi_private = io; clone->bi_end_io = crypt_endio; bio_set_dev(clone, cc->dev->bdev); clone->bi_opf = io->base_bio->bi_opf; } static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) { struct crypt_config *cc = io->cc; struct bio *clone; /* * We need the original biovec array in order to decrypt * the whole bio data *afterwards* -- thanks to immutable * biovecs we don't need to worry about the block layer * modifying the biovec array; so leverage bio_clone_fast(). */ clone = bio_clone_fast(io->base_bio, gfp, &cc->bs); if (!clone) return 1; crypt_inc_pending(io); clone_init(io, clone); clone->bi_iter.bi_sector = cc->start + io->sector; if (dm_crypt_integrity_io_alloc(io, clone)) { crypt_dec_pending(io); bio_put(clone); return 1; } generic_make_request(clone); return 0; } static void kcryptd_io_read_work(struct work_struct *work) { struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); crypt_inc_pending(io); if (kcryptd_io_read(io, GFP_NOIO)) io->error = BLK_STS_RESOURCE; crypt_dec_pending(io); } static void kcryptd_queue_read(struct dm_crypt_io *io) { struct crypt_config *cc = io->cc; INIT_WORK(&io->work, kcryptd_io_read_work); queue_work(cc->io_queue, &io->work); } static void kcryptd_io_write(struct dm_crypt_io *io) { struct bio *clone = io->ctx.bio_out; generic_make_request(clone); } #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) static int dmcrypt_write(void *data) { struct crypt_config *cc = data; struct dm_crypt_io *io; while (1) { struct rb_root write_tree; struct blk_plug plug; spin_lock_irq(&cc->write_thread_lock); continue_locked: if (!RB_EMPTY_ROOT(&cc->write_tree)) goto pop_from_list; set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irq(&cc->write_thread_lock); if (unlikely(kthread_should_stop())) { set_current_state(TASK_RUNNING); break; } schedule(); set_current_state(TASK_RUNNING); spin_lock_irq(&cc->write_thread_lock); goto continue_locked; pop_from_list: write_tree = cc->write_tree; cc->write_tree = RB_ROOT; spin_unlock_irq(&cc->write_thread_lock); BUG_ON(rb_parent(write_tree.rb_node)); /* * Note: we cannot walk the tree here with rb_next because * the structures may be freed when kcryptd_io_write is called. */ blk_start_plug(&plug); do { io = crypt_io_from_node(rb_first(&write_tree)); rb_erase(&io->rb_node, &write_tree); kcryptd_io_write(io); } while (!RB_EMPTY_ROOT(&write_tree)); blk_finish_plug(&plug); } return 0; } static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) { struct bio *clone = io->ctx.bio_out; struct crypt_config *cc = io->cc; unsigned long flags; sector_t sector; struct rb_node **rbp, *parent; if (unlikely(io->error)) { crypt_free_buffer_pages(cc, clone); bio_put(clone); crypt_dec_pending(io); return; } /* crypt_convert should have filled the clone bio */ BUG_ON(io->ctx.iter_out.bi_size); clone->bi_iter.bi_sector = cc->start + io->sector; if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { generic_make_request(clone); return; } spin_lock_irqsave(&cc->write_thread_lock, flags); if (RB_EMPTY_ROOT(&cc->write_tree)) wake_up_process(cc->write_thread); rbp = &cc->write_tree.rb_node; parent = NULL; sector = io->sector; while (*rbp) { parent = *rbp; if (sector < crypt_io_from_node(parent)->sector) rbp = &(*rbp)->rb_left; else rbp = &(*rbp)->rb_right; } rb_link_node(&io->rb_node, parent, rbp); rb_insert_color(&io->rb_node, &cc->write_tree); spin_unlock_irqrestore(&cc->write_thread_lock, flags); } static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) { struct crypt_config *cc = io->cc; struct bio *clone; int crypt_finished; sector_t sector = io->sector; blk_status_t r; /* * Prevent io from disappearing until this function completes. */ crypt_inc_pending(io); crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); if (unlikely(!clone)) { io->error = BLK_STS_IOERR; goto dec; } io->ctx.bio_out = clone; io->ctx.iter_out = clone->bi_iter; sector += bio_sectors(clone); crypt_inc_pending(io); r = crypt_convert(cc, &io->ctx); if (r) io->error = r; crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); /* Encryption was already finished, submit io now */ if (crypt_finished) { kcryptd_crypt_write_io_submit(io, 0); io->sector = sector; } dec: crypt_dec_pending(io); } static void kcryptd_crypt_read_done(struct dm_crypt_io *io) { crypt_dec_pending(io); } static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) { struct crypt_config *cc = io->cc; blk_status_t r; crypt_inc_pending(io); crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, io->sector); r = crypt_convert(cc, &io->ctx); if (r) io->error = r; if (atomic_dec_and_test(&io->ctx.cc_pending)) kcryptd_crypt_read_done(io); crypt_dec_pending(io); } static void kcryptd_async_done(struct crypto_async_request *async_req, int error) { struct dm_crypt_request *dmreq = async_req->data; struct convert_context *ctx = dmreq->ctx; struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); struct crypt_config *cc = io->cc; /* * A request from crypto driver backlog is going to be processed now, * finish the completion and continue in crypt_convert(). * (Callback will be called for the second time for this request.) */ if (error == -EINPROGRESS) { complete(&ctx->restart); return; } if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); if (error == -EBADMSG) { char b[BDEVNAME_SIZE]; DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); io->error = BLK_STS_PROTECTION; } else if (error < 0) io->error = BLK_STS_IOERR; crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); if (!atomic_dec_and_test(&ctx->cc_pending)) return; if (bio_data_dir(io->base_bio) == READ) kcryptd_crypt_read_done(io); else kcryptd_crypt_write_io_submit(io, 1); } static void kcryptd_crypt(struct work_struct *work) { struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); if (bio_data_dir(io->base_bio) == READ) kcryptd_crypt_read_convert(io); else kcryptd_crypt_write_convert(io); } static void kcryptd_queue_crypt(struct dm_crypt_io *io) { struct crypt_config *cc = io->cc; INIT_WORK(&io->work, kcryptd_crypt); queue_work(cc->crypt_queue, &io->work); } static void crypt_free_tfms_aead(struct crypt_config *cc) { if (!cc->cipher_tfm.tfms_aead) return; if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); cc->cipher_tfm.tfms_aead[0] = NULL; } kfree(cc->cipher_tfm.tfms_aead); cc->cipher_tfm.tfms_aead = NULL; } static void crypt_free_tfms_skcipher(struct crypt_config *cc) { unsigned i; if (!cc->cipher_tfm.tfms) return; for (i = 0; i < cc->tfms_count; i++) if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { crypto_free_skcipher(cc->cipher_tfm.tfms[i]); cc->cipher_tfm.tfms[i] = NULL; } kfree(cc->cipher_tfm.tfms); cc->cipher_tfm.tfms = NULL; } static void crypt_free_tfms(struct crypt_config *cc) { if (crypt_integrity_aead(cc)) crypt_free_tfms_aead(cc); else crypt_free_tfms_skcipher(cc); } static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) { unsigned i; int err; cc->cipher_tfm.tfms = kcalloc(cc->tfms_count, sizeof(struct crypto_skcipher *), GFP_KERNEL); if (!cc->cipher_tfm.tfms) return -ENOMEM; for (i = 0; i < cc->tfms_count; i++) { cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); if (IS_ERR(cc->cipher_tfm.tfms[i])) { err = PTR_ERR(cc->cipher_tfm.tfms[i]); crypt_free_tfms(cc); return err; } } /* * dm-crypt performance can vary greatly depending on which crypto * algorithm implementation is used. Help people debug performance * problems by logging the ->cra_driver_name. */ DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); return 0; } static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) { int err; cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); if (!cc->cipher_tfm.tfms) return -ENOMEM; cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0); if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); crypt_free_tfms(cc); return err; } DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); return 0; } static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) { if (crypt_integrity_aead(cc)) return crypt_alloc_tfms_aead(cc, ciphermode); else return crypt_alloc_tfms_skcipher(cc, ciphermode); } static unsigned crypt_subkey_size(struct crypt_config *cc) { return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); } static unsigned crypt_authenckey_size(struct crypt_config *cc) { return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); } /* * If AEAD is composed like authenc(hmac(sha256),xts(aes)), * the key must be for some reason in special format. * This funcion converts cc->key to this special format. */ static void crypt_copy_authenckey(char *p, const void *key, unsigned enckeylen, unsigned authkeylen) { struct crypto_authenc_key_param *param; struct rtattr *rta; rta = (struct rtattr *)p; param = RTA_DATA(rta); param->enckeylen = cpu_to_be32(enckeylen); rta->rta_len = RTA_LENGTH(sizeof(*param)); rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; p += RTA_SPACE(sizeof(*param)); memcpy(p, key + enckeylen, authkeylen); p += authkeylen; memcpy(p, key, enckeylen); } static int crypt_setkey(struct crypt_config *cc) { unsigned subkey_size; int err = 0, i, r; /* Ignore extra keys (which are used for IV etc) */ subkey_size = crypt_subkey_size(cc); if (crypt_integrity_hmac(cc)) { if (subkey_size < cc->key_mac_size) return -EINVAL; crypt_copy_authenckey(cc->authenc_key, cc->key, subkey_size - cc->key_mac_size, cc->key_mac_size); } for (i = 0; i < cc->tfms_count; i++) { if (crypt_integrity_hmac(cc)) r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], cc->authenc_key, crypt_authenckey_size(cc)); else if (crypt_integrity_aead(cc)) r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], cc->key + (i * subkey_size), subkey_size); else r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], cc->key + (i * subkey_size), subkey_size); if (r) err = r; } if (crypt_integrity_hmac(cc)) memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); return err; } #ifdef CONFIG_KEYS static bool contains_whitespace(const char *str) { while (*str) if (isspace(*str++)) return true; return false; } static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) { char *new_key_string, *key_desc; int ret; struct key *key; const struct user_key_payload *ukp; /* * Reject key_string with whitespace. dm core currently lacks code for * proper whitespace escaping in arguments on DM_TABLE_STATUS path. */ if (contains_whitespace(key_string)) { DMERR("whitespace chars not allowed in key string"); return -EINVAL; } /* look for next ':' separating key_type from key_description */ key_desc = strpbrk(key_string, ":"); if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) return -EINVAL; if (strncmp(key_string, "logon:", key_desc - key_string + 1) && strncmp(key_string, "user:", key_desc - key_string + 1)) return -EINVAL; new_key_string = kstrdup(key_string, GFP_KERNEL); if (!new_key_string) return -ENOMEM; key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user, key_desc + 1, NULL); if (IS_ERR(key)) { kzfree(new_key_string); return PTR_ERR(key); } down_read(&key->sem); ukp = user_key_payload_locked(key); if (!ukp) { up_read(&key->sem); key_put(key); kzfree(new_key_string); return -EKEYREVOKED; } if (cc->key_size != ukp->datalen) { up_read(&key->sem); key_put(key); kzfree(new_key_string); return -EINVAL; } memcpy(cc->key, ukp->data, cc->key_size); up_read(&key->sem); key_put(key); /* clear the flag since following operations may invalidate previously valid key */ clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); ret = crypt_setkey(cc); if (!ret) { set_bit(DM_CRYPT_KEY_VALID, &cc->flags); kzfree(cc->key_string); cc->key_string = new_key_string; } else kzfree(new_key_string); return ret; } static int get_key_size(char **key_string) { char *colon, dummy; int ret; if (*key_string[0] != ':') return strlen(*key_string) >> 1; /* look for next ':' in key string */ colon = strpbrk(*key_string + 1, ":"); if (!colon) return -EINVAL; if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') return -EINVAL; *key_string = colon; /* remaining key string should be :<logon|user>:<key_desc> */ return ret; } #else static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) { return -EINVAL; } static int get_key_size(char **key_string) { return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; } #endif static int crypt_set_key(struct crypt_config *cc, char *key) { int r = -EINVAL; int key_string_len = strlen(key); /* Hyphen (which gives a key_size of zero) means there is no key. */ if (!cc->key_size && strcmp(key, "-")) goto out; /* ':' means the key is in kernel keyring, short-circuit normal key processing */ if (key[0] == ':') { r = crypt_set_keyring_key(cc, key + 1); goto out; } /* clear the flag since following operations may invalidate previously valid key */ clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); /* wipe references to any kernel keyring key */ kzfree(cc->key_string); cc->key_string = NULL; /* Decode key from its hex representation. */ if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) goto out; r = crypt_setkey(cc); if (!r) set_bit(DM_CRYPT_KEY_VALID, &cc->flags); out: /* Hex key string not needed after here, so wipe it. */ memset(key, '0', key_string_len); return r; } static int crypt_wipe_key(struct crypt_config *cc) { int r; clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); get_random_bytes(&cc->key, cc->key_size); kzfree(cc->key_string); cc->key_string = NULL; r = crypt_setkey(cc); memset(&cc->key, 0, cc->key_size * sizeof(u8)); return r; } static void crypt_calculate_pages_per_client(void) { unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; if (!dm_crypt_clients_n) return; pages /= dm_crypt_clients_n; if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; dm_crypt_pages_per_client = pages; } static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) { struct crypt_config *cc = pool_data; struct page *page; if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) && likely(gfp_mask & __GFP_NORETRY)) return NULL; page = alloc_page(gfp_mask); if (likely(page != NULL)) percpu_counter_add(&cc->n_allocated_pages, 1); return page; } static void crypt_page_free(void *page, void *pool_data) { struct crypt_config *cc = pool_data; __free_page(page); percpu_counter_sub(&cc->n_allocated_pages, 1); } static void crypt_dtr(struct dm_target *ti) { struct crypt_config *cc = ti->private; ti->private = NULL; if (!cc) return; if (cc->write_thread) kthread_stop(cc->write_thread); if (cc->io_queue) destroy_workqueue(cc->io_queue); if (cc->crypt_queue) destroy_workqueue(cc->crypt_queue); crypt_free_tfms(cc); bioset_exit(&cc->bs); mempool_exit(&cc->page_pool); mempool_exit(&cc->req_pool); mempool_exit(&cc->tag_pool); WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); percpu_counter_destroy(&cc->n_allocated_pages); if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) cc->iv_gen_ops->dtr(cc); if (cc->dev) dm_put_device(ti, cc->dev); kzfree(cc->cipher); kzfree(cc->cipher_string); kzfree(cc->key_string); kzfree(cc->cipher_auth); kzfree(cc->authenc_key); mutex_destroy(&cc->bio_alloc_lock); /* Must zero key material before freeing */ kzfree(cc); spin_lock(&dm_crypt_clients_lock); WARN_ON(!dm_crypt_clients_n); dm_crypt_clients_n--; crypt_calculate_pages_per_client(); spin_unlock(&dm_crypt_clients_lock); } static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) { struct crypt_config *cc = ti->private; if (crypt_integrity_aead(cc)) cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); else cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); if (cc->iv_size) /* at least a 64 bit sector number should fit in our buffer */ cc->iv_size = max(cc->iv_size, (unsigned int)(sizeof(u64) / sizeof(u8))); else if (ivmode) { DMWARN("Selected cipher does not support IVs"); ivmode = NULL; } /* Choose ivmode, see comments at iv code. */ if (ivmode == NULL) cc->iv_gen_ops = NULL; else if (strcmp(ivmode, "plain") == 0) cc->iv_gen_ops = &crypt_iv_plain_ops; else if (strcmp(ivmode, "plain64") == 0) cc->iv_gen_ops = &crypt_iv_plain64_ops; else if (strcmp(ivmode, "plain64be") == 0) cc->iv_gen_ops = &crypt_iv_plain64be_ops; else if (strcmp(ivmode, "essiv") == 0) cc->iv_gen_ops = &crypt_iv_essiv_ops; else if (strcmp(ivmode, "benbi") == 0) cc->iv_gen_ops = &crypt_iv_benbi_ops; else if (strcmp(ivmode, "null") == 0) cc->iv_gen_ops = &crypt_iv_null_ops; else if (strcmp(ivmode, "lmk") == 0) { cc->iv_gen_ops = &crypt_iv_lmk_ops; /* * Version 2 and 3 is recognised according * to length of provided multi-key string. * If present (version 3), last key is used as IV seed. * All keys (including IV seed) are always the same size. */ if (cc->key_size % cc->key_parts) { cc->key_parts++; cc->key_extra_size = cc->key_size / cc->key_parts; } } else if (strcmp(ivmode, "tcw") == 0) { cc->iv_gen_ops = &crypt_iv_tcw_ops; cc->key_parts += 2; /* IV + whitening */ cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; } else if (strcmp(ivmode, "random") == 0) { cc->iv_gen_ops = &crypt_iv_random_ops; /* Need storage space in integrity fields. */ cc->integrity_iv_size = cc->iv_size; } else { ti->error = "Invalid IV mode"; return -EINVAL; } return 0; } /* * Workaround to parse cipher algorithm from crypto API spec. * The cc->cipher is currently used only in ESSIV. * This should be probably done by crypto-api calls (once available...) */ static int crypt_ctr_blkdev_cipher(struct crypt_config *cc) { const char *alg_name = NULL; char *start, *end; if (crypt_integrity_aead(cc)) { alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc))); if (!alg_name) return -EINVAL; if (crypt_integrity_hmac(cc)) { alg_name = strchr(alg_name, ','); if (!alg_name) return -EINVAL; } alg_name++; } else { alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc))); if (!alg_name) return -EINVAL; } start = strchr(alg_name, '('); end = strchr(alg_name, ')'); if (!start && !end) { cc->cipher = kstrdup(alg_name, GFP_KERNEL); return cc->cipher ? 0 : -ENOMEM; } if (!start || !end || ++start >= end) return -EINVAL; cc->cipher = kzalloc(end - start + 1, GFP_KERNEL); if (!cc->cipher) return -ENOMEM; strncpy(cc->cipher, start, end - start); return 0; } /* * Workaround to parse HMAC algorithm from AEAD crypto API spec. * The HMAC is needed to calculate tag size (HMAC digest size). * This should be probably done by crypto-api calls (once available...) */ static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) { char *start, *end, *mac_alg = NULL; struct crypto_ahash *mac; if (!strstarts(cipher_api, "authenc(")) return 0; start = strchr(cipher_api, '('); end = strchr(cipher_api, ','); if (!start || !end || ++start > end) return -EINVAL; mac_alg = kzalloc(end - start + 1, GFP_KERNEL); if (!mac_alg) return -ENOMEM; strncpy(mac_alg, start, end - start); mac = crypto_alloc_ahash(mac_alg, 0, 0); kfree(mac_alg); if (IS_ERR(mac)) return PTR_ERR(mac); cc->key_mac_size = crypto_ahash_digestsize(mac); crypto_free_ahash(mac); cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); if (!cc->authenc_key) return -ENOMEM; return 0; } static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, char **ivmode, char **ivopts) { struct crypt_config *cc = ti->private; char *tmp, *cipher_api; int ret = -EINVAL; cc->tfms_count = 1; /* * New format (capi: prefix) * capi:cipher_api_spec-iv:ivopts */ tmp = &cipher_in[strlen("capi:")]; /* Separate IV options if present, it can contain another '-' in hash name */ *ivopts = strrchr(tmp, ':'); if (*ivopts) { **ivopts = '\0'; (*ivopts)++; } /* Parse IV mode */ *ivmode = strrchr(tmp, '-'); if (*ivmode) { **ivmode = '\0'; (*ivmode)++; } /* The rest is crypto API spec */ cipher_api = tmp; if (*ivmode && !strcmp(*ivmode, "lmk")) cc->tfms_count = 64; cc->key_parts = cc->tfms_count; /* Allocate cipher */ ret = crypt_alloc_tfms(cc, cipher_api); if (ret < 0) { ti->error = "Error allocating crypto tfm"; return ret; } /* Alloc AEAD, can be used only in new format. */ if (crypt_integrity_aead(cc)) { ret = crypt_ctr_auth_cipher(cc, cipher_api); if (ret < 0) { ti->error = "Invalid AEAD cipher spec"; return -ENOMEM; } cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); } else cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); ret = crypt_ctr_blkdev_cipher(cc); if (ret < 0) { ti->error = "Cannot allocate cipher string"; return -ENOMEM; } return 0; } static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, char **ivmode, char **ivopts) { struct crypt_config *cc = ti->private; char *tmp, *cipher, *chainmode, *keycount; char *cipher_api = NULL; int ret = -EINVAL; char dummy; if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { ti->error = "Bad cipher specification"; return -EINVAL; } /* * Legacy dm-crypt cipher specification * cipher[:keycount]-mode-iv:ivopts */ tmp = cipher_in; keycount = strsep(&tmp, "-"); cipher = strsep(&keycount, ":"); if (!keycount) cc->tfms_count = 1; else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || !is_power_of_2(cc->tfms_count)) { ti->error = "Bad cipher key count specification"; return -EINVAL; } cc->key_parts = cc->tfms_count; cc->cipher = kstrdup(cipher, GFP_KERNEL); if (!cc->cipher) goto bad_mem; chainmode = strsep(&tmp, "-"); *ivmode = strsep(&tmp, ":"); *ivopts = tmp; /* * For compatibility with the original dm-crypt mapping format, if * only the cipher name is supplied, use cbc-plain. */ if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { chainmode = "cbc"; *ivmode = "plain"; } if (strcmp(chainmode, "ecb") && !*ivmode) { ti->error = "IV mechanism required"; return -EINVAL; } cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); if (!cipher_api) goto bad_mem; ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode, cipher); if (ret < 0) { kfree(cipher_api); goto bad_mem; } /* Allocate cipher */ ret = crypt_alloc_tfms(cc, cipher_api); if (ret < 0) { ti->error = "Error allocating crypto tfm"; kfree(cipher_api); return ret; } kfree(cipher_api); return 0; bad_mem: ti->error = "Cannot allocate cipher strings"; return -ENOMEM; } static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) { struct crypt_config *cc = ti->private; char *ivmode = NULL, *ivopts = NULL; int ret; cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); if (!cc->cipher_string) { ti->error = "Cannot allocate cipher strings"; return -ENOMEM; } if (strstarts(cipher_in, "capi:")) ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); else ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); if (ret) return ret; /* Initialize IV */ ret = crypt_ctr_ivmode(ti, ivmode); if (ret < 0) return ret; /* Initialize and set key */ ret = crypt_set_key(cc, key); if (ret < 0) { ti->error = "Error decoding and setting key"; return ret; } /* Allocate IV */ if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); if (ret < 0) { ti->error = "Error creating IV"; return ret; } } /* Initialize IV (set keys for ESSIV etc) */ if (cc->iv_gen_ops && cc->iv_gen_ops->init) { ret = cc->iv_gen_ops->init(cc); if (ret < 0) { ti->error = "Error initialising IV"; return ret; } } /* wipe the kernel key payload copy */ if (cc->key_string) memset(cc->key, 0, cc->key_size * sizeof(u8)); return ret; } static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) { struct crypt_config *cc = ti->private; struct dm_arg_set as; static const struct dm_arg _args[] = { {0, 6, "Invalid number of feature args"}, }; unsigned int opt_params, val; const char *opt_string, *sval; char dummy; int ret; /* Optional parameters */ as.argc = argc; as.argv = argv; ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); if (ret) return ret; while (opt_params--) { opt_string = dm_shift_arg(&as); if (!opt_string) { ti->error = "Not enough feature arguments"; return -EINVAL; } if (!strcasecmp(opt_string, "allow_discards")) ti->num_discard_bios = 1; else if (!strcasecmp(opt_string, "same_cpu_crypt")) set_bit(DM_CRYPT_SAME_CPU, &cc->flags); else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { if (val == 0 || val > MAX_TAG_SIZE) { ti->error = "Invalid integrity arguments"; return -EINVAL; } cc->on_disk_tag_size = val; sval = strchr(opt_string + strlen("integrity:"), ':') + 1; if (!strcasecmp(sval, "aead")) { set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); } else if (strcasecmp(sval, "none")) { ti->error = "Unknown integrity profile"; return -EINVAL; } cc->cipher_auth = kstrdup(sval, GFP_KERNEL); if (!cc->cipher_auth) return -ENOMEM; } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { if (cc->sector_size < (1 << SECTOR_SHIFT) || cc->sector_size > 4096 || (cc->sector_size & (cc->sector_size - 1))) { ti->error = "Invalid feature value for sector_size"; return -EINVAL; } if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { ti->error = "Device size is not multiple of sector_size feature"; return -EINVAL; } cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; } else if (!strcasecmp(opt_string, "iv_large_sectors")) set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); else { ti->error = "Invalid feature arguments"; return -EINVAL; } } return 0; } /* * Construct an encryption mapping: * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> */ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) { struct crypt_config *cc; const char *devname = dm_table_device_name(ti->table); int key_size; unsigned int align_mask; unsigned long long tmpll; int ret; size_t iv_size_padding, additional_req_size; char dummy; if (argc < 5) { ti->error = "Not enough arguments"; return -EINVAL; } key_size = get_key_size(&argv[1]); if (key_size < 0) { ti->error = "Cannot parse key size"; return -EINVAL; } cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); if (!cc) { ti->error = "Cannot allocate encryption context"; return -ENOMEM; } cc->key_size = key_size; cc->sector_size = (1 << SECTOR_SHIFT); cc->sector_shift = 0; ti->private = cc; spin_lock(&dm_crypt_clients_lock); dm_crypt_clients_n++; crypt_calculate_pages_per_client(); spin_unlock(&dm_crypt_clients_lock); ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); if (ret < 0) goto bad; /* Optional parameters need to be read before cipher constructor */ if (argc > 5) { ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); if (ret) goto bad; } ret = crypt_ctr_cipher(ti, argv[0], argv[1]); if (ret < 0) goto bad; if (crypt_integrity_aead(cc)) { cc->dmreq_start = sizeof(struct aead_request); cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); } else { cc->dmreq_start = sizeof(struct skcipher_request); cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); align_mask = crypto_skcipher_alignmask(any_tfm(cc)); } cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); if (align_mask < CRYPTO_MINALIGN) { /* Allocate the padding exactly */ iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) & align_mask; } else { /* * If the cipher requires greater alignment than kmalloc * alignment, we don't know the exact position of the * initialization vector. We must assume worst case. */ iv_size_padding = align_mask; } /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ additional_req_size = sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size + cc->iv_size + sizeof(uint64_t) + sizeof(unsigned int); ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); if (ret) { ti->error = "Cannot allocate crypt request mempool"; goto bad; } cc->per_bio_data_size = ti->per_io_data_size = ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, ARCH_KMALLOC_MINALIGN); ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc); if (ret) { ti->error = "Cannot allocate page mempool"; goto bad; } ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); if (ret) { ti->error = "Cannot allocate crypt bioset"; goto bad; } mutex_init(&cc->bio_alloc_lock); ret = -EINVAL; if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { ti->error = "Invalid iv_offset sector"; goto bad; } cc->iv_offset = tmpll; ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); if (ret) { ti->error = "Device lookup failed"; goto bad; } ret = -EINVAL; if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { ti->error = "Invalid device sector"; goto bad; } cc->start = tmpll; if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { ret = crypt_integrity_ctr(cc, ti); if (ret) goto bad; cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; if (!cc->tag_pool_max_sectors) cc->tag_pool_max_sectors = 1; ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, cc->tag_pool_max_sectors * cc->on_disk_tag_size); if (ret) { ti->error = "Cannot allocate integrity tags mempool"; goto bad; } cc->tag_pool_max_sectors <<= cc->sector_shift; } ret = -ENOMEM; cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1, devname); if (!cc->io_queue) { ti->error = "Couldn't create kcryptd io queue"; goto bad; } if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1, devname); else cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus(), devname); if (!cc->crypt_queue) { ti->error = "Couldn't create kcryptd queue"; goto bad; } spin_lock_init(&cc->write_thread_lock); cc->write_tree = RB_ROOT; cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname); if (IS_ERR(cc->write_thread)) { ret = PTR_ERR(cc->write_thread); cc->write_thread = NULL; ti->error = "Couldn't spawn write thread"; goto bad; } wake_up_process(cc->write_thread); ti->num_flush_bios = 1; return 0; bad: crypt_dtr(ti); return ret; } static int crypt_map(struct dm_target *ti, struct bio *bio) { struct dm_crypt_io *io; struct crypt_config *cc = ti->private; /* * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight * - for REQ_OP_DISCARD caller must use flush if IO ordering matters */ if (unlikely(bio->bi_opf & REQ_PREFLUSH || bio_op(bio) == REQ_OP_DISCARD)) { bio_set_dev(bio, cc->dev->bdev); if (bio_sectors(bio)) bio->bi_iter.bi_sector = cc->start + dm_target_offset(ti, bio->bi_iter.bi_sector); return DM_MAPIO_REMAPPED; } /* * Check if bio is too large, split as needed. */ if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); /* * Ensure that bio is a multiple of internal sector encryption size * and is aligned to this size as defined in IO hints. */ if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) return DM_MAPIO_KILL; if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) return DM_MAPIO_KILL; io = dm_per_bio_data(bio, cc->per_bio_data_size); crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); if (cc->on_disk_tag_size) { unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); if (unlikely(tag_len > KMALLOC_MAX_SIZE) || unlikely(!(io->integrity_metadata = kmalloc(tag_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { if (bio_sectors(bio) > cc->tag_pool_max_sectors) dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); io->integrity_metadata_from_pool = true; } } if (crypt_integrity_aead(cc)) io->ctx.r.req_aead = (struct aead_request *)(io + 1); else io->ctx.r.req = (struct skcipher_request *)(io + 1); if (bio_data_dir(io->base_bio) == READ) { if (kcryptd_io_read(io, GFP_NOWAIT)) kcryptd_queue_read(io); } else kcryptd_queue_crypt(io); return DM_MAPIO_SUBMITTED; } static void crypt_status(struct dm_target *ti, status_type_t type, unsigned status_flags, char *result, unsigned maxlen) { struct crypt_config *cc = ti->private; unsigned i, sz = 0; int num_feature_args = 0; switch (type) { case STATUSTYPE_INFO: result[0] = '\0'; break; case STATUSTYPE_TABLE: DMEMIT("%s ", cc->cipher_string); if (cc->key_size > 0) { if (cc->key_string) DMEMIT(":%u:%s", cc->key_size, cc->key_string); else for (i = 0; i < cc->key_size; i++) DMEMIT("%02x", cc->key[i]); } else DMEMIT("-"); DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, cc->dev->name, (unsigned long long)cc->start); num_feature_args += !!ti->num_discard_bios; num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); if (cc->on_disk_tag_size) num_feature_args++; if (num_feature_args) { DMEMIT(" %d", num_feature_args); if (ti->num_discard_bios) DMEMIT(" allow_discards"); if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) DMEMIT(" same_cpu_crypt"); if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) DMEMIT(" submit_from_crypt_cpus"); if (cc->on_disk_tag_size) DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); if (cc->sector_size != (1 << SECTOR_SHIFT)) DMEMIT(" sector_size:%d", cc->sector_size); if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) DMEMIT(" iv_large_sectors"); } break; } } static void crypt_postsuspend(struct dm_target *ti) { struct crypt_config *cc = ti->private; set_bit(DM_CRYPT_SUSPENDED, &cc->flags); } static int crypt_preresume(struct dm_target *ti) { struct crypt_config *cc = ti->private; if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { DMERR("aborting resume - crypt key is not set."); return -EAGAIN; } return 0; } static void crypt_resume(struct dm_target *ti) { struct crypt_config *cc = ti->private; clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); } /* Message interface * key set <key> * key wipe */ static int crypt_message(struct dm_target *ti, unsigned argc, char **argv, char *result, unsigned maxlen) { struct crypt_config *cc = ti->private; int key_size, ret = -EINVAL; if (argc < 2) goto error; if (!strcasecmp(argv[0], "key")) { if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { DMWARN("not suspended during key manipulation."); return -EINVAL; } if (argc == 3 && !strcasecmp(argv[1], "set")) { /* The key size may not be changed. */ key_size = get_key_size(&argv[2]); if (key_size < 0 || cc->key_size != key_size) { memset(argv[2], '0', strlen(argv[2])); return -EINVAL; } ret = crypt_set_key(cc, argv[2]); if (ret) return ret; if (cc->iv_gen_ops && cc->iv_gen_ops->init) ret = cc->iv_gen_ops->init(cc); /* wipe the kernel key payload copy */ if (cc->key_string) memset(cc->key, 0, cc->key_size * sizeof(u8)); return ret; } if (argc == 2 && !strcasecmp(argv[1], "wipe")) { if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { ret = cc->iv_gen_ops->wipe(cc); if (ret) return ret; } return crypt_wipe_key(cc); } } error: DMWARN("unrecognised message received."); return -EINVAL; } static int crypt_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { struct crypt_config *cc = ti->private; return fn(ti, cc->dev, cc->start, ti->len, data); } static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) { struct crypt_config *cc = ti->private; /* * Unfortunate constraint that is required to avoid the potential * for exceeding underlying device's max_segments limits -- due to * crypt_alloc_buffer() possibly allocating pages for the encryption * bio that are not as physically contiguous as the original bio. */ limits->max_segment_size = PAGE_SIZE; limits->logical_block_size = max_t(unsigned short, limits->logical_block_size, cc->sector_size); limits->physical_block_size = max_t(unsigned, limits->physical_block_size, cc->sector_size); limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size); } static struct target_type crypt_target = { .name = "crypt", .version = {1, 18, 1}, .module = THIS_MODULE, .ctr = crypt_ctr, .dtr = crypt_dtr, .map = crypt_map, .status = crypt_status, .postsuspend = crypt_postsuspend, .preresume = crypt_preresume, .resume = crypt_resume, .message = crypt_message, .iterate_devices = crypt_iterate_devices, .io_hints = crypt_io_hints, }; static int __init dm_crypt_init(void) { int r; r = dm_register_target(&crypt_target); if (r < 0) DMERR("register failed %d", r); return r; } static void __exit dm_crypt_exit(void) { dm_unregister_target(&crypt_target); } module_init(dm_crypt_init); module_exit(dm_crypt_exit); MODULE_AUTHOR("Jana Saout <jana@saout.de>"); MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); MODULE_LICENSE("GPL");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1