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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
commit | dc50eab76b709d68175a358d6e23a5a3890764d3 (patch) | |
tree | c754d0390db060af0213ff994f0ac310e4cfd6e9 /fs/bcachefs/checksum.c | |
parent | Adding debian version 6.6.15-2. (diff) | |
download | linux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip |
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/bcachefs/checksum.c')
-rw-r--r-- | fs/bcachefs/checksum.c | 804 |
1 files changed, 804 insertions, 0 deletions
diff --git a/fs/bcachefs/checksum.c b/fs/bcachefs/checksum.c new file mode 100644 index 0000000000..3c761ad6b1 --- /dev/null +++ b/fs/bcachefs/checksum.c @@ -0,0 +1,804 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "bcachefs.h" +#include "checksum.h" +#include "errcode.h" +#include "super.h" +#include "super-io.h" + +#include <linux/crc32c.h> +#include <linux/crypto.h> +#include <linux/xxhash.h> +#include <linux/key.h> +#include <linux/random.h> +#include <linux/scatterlist.h> +#include <crypto/algapi.h> +#include <crypto/chacha.h> +#include <crypto/hash.h> +#include <crypto/poly1305.h> +#include <crypto/skcipher.h> +#include <keys/user-type.h> + +/* + * bch2_checksum state is an abstraction of the checksum state calculated over different pages. + * it features page merging without having the checksum algorithm lose its state. + * for native checksum aglorithms (like crc), a default seed value will do. + * for hash-like algorithms, a state needs to be stored + */ + +struct bch2_checksum_state { + union { + u64 seed; + struct xxh64_state h64state; + }; + unsigned int type; +}; + +static void bch2_checksum_init(struct bch2_checksum_state *state) +{ + switch (state->type) { + case BCH_CSUM_none: + case BCH_CSUM_crc32c: + case BCH_CSUM_crc64: + state->seed = 0; + break; + case BCH_CSUM_crc32c_nonzero: + state->seed = U32_MAX; + break; + case BCH_CSUM_crc64_nonzero: + state->seed = U64_MAX; + break; + case BCH_CSUM_xxhash: + xxh64_reset(&state->h64state, 0); + break; + default: + BUG(); + } +} + +static u64 bch2_checksum_final(const struct bch2_checksum_state *state) +{ + switch (state->type) { + case BCH_CSUM_none: + case BCH_CSUM_crc32c: + case BCH_CSUM_crc64: + return state->seed; + case BCH_CSUM_crc32c_nonzero: + return state->seed ^ U32_MAX; + case BCH_CSUM_crc64_nonzero: + return state->seed ^ U64_MAX; + case BCH_CSUM_xxhash: + return xxh64_digest(&state->h64state); + default: + BUG(); + } +} + +static void bch2_checksum_update(struct bch2_checksum_state *state, const void *data, size_t len) +{ + switch (state->type) { + case BCH_CSUM_none: + return; + case BCH_CSUM_crc32c_nonzero: + case BCH_CSUM_crc32c: + state->seed = crc32c(state->seed, data, len); + break; + case BCH_CSUM_crc64_nonzero: + case BCH_CSUM_crc64: + state->seed = crc64_be(state->seed, data, len); + break; + case BCH_CSUM_xxhash: + xxh64_update(&state->h64state, data, len); + break; + default: + BUG(); + } +} + +static inline int do_encrypt_sg(struct crypto_sync_skcipher *tfm, + struct nonce nonce, + struct scatterlist *sg, size_t len) +{ + SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm); + int ret; + + skcipher_request_set_sync_tfm(req, tfm); + skcipher_request_set_crypt(req, sg, sg, len, nonce.d); + + ret = crypto_skcipher_encrypt(req); + if (ret) + pr_err("got error %i from crypto_skcipher_encrypt()", ret); + + return ret; +} + +static inline int do_encrypt(struct crypto_sync_skcipher *tfm, + struct nonce nonce, + void *buf, size_t len) +{ + if (!is_vmalloc_addr(buf)) { + struct scatterlist sg; + + sg_init_table(&sg, 1); + sg_set_page(&sg, + is_vmalloc_addr(buf) + ? vmalloc_to_page(buf) + : virt_to_page(buf), + len, offset_in_page(buf)); + return do_encrypt_sg(tfm, nonce, &sg, len); + } else { + unsigned pages = buf_pages(buf, len); + struct scatterlist *sg; + size_t orig_len = len; + int ret, i; + + sg = kmalloc_array(pages, sizeof(*sg), GFP_KERNEL); + if (!sg) + return -BCH_ERR_ENOMEM_do_encrypt; + + sg_init_table(sg, pages); + + for (i = 0; i < pages; i++) { + unsigned offset = offset_in_page(buf); + unsigned pg_len = min_t(size_t, len, PAGE_SIZE - offset); + + sg_set_page(sg + i, vmalloc_to_page(buf), pg_len, offset); + buf += pg_len; + len -= pg_len; + } + + ret = do_encrypt_sg(tfm, nonce, sg, orig_len); + kfree(sg); + return ret; + } +} + +int bch2_chacha_encrypt_key(struct bch_key *key, struct nonce nonce, + void *buf, size_t len) +{ + struct crypto_sync_skcipher *chacha20 = + crypto_alloc_sync_skcipher("chacha20", 0, 0); + int ret; + + ret = PTR_ERR_OR_ZERO(chacha20); + if (ret) { + pr_err("error requesting chacha20 cipher: %s", bch2_err_str(ret)); + return ret; + } + + ret = crypto_skcipher_setkey(&chacha20->base, + (void *) key, sizeof(*key)); + if (ret) { + pr_err("error from crypto_skcipher_setkey(): %s", bch2_err_str(ret)); + goto err; + } + + ret = do_encrypt(chacha20, nonce, buf, len); +err: + crypto_free_sync_skcipher(chacha20); + return ret; +} + +static int gen_poly_key(struct bch_fs *c, struct shash_desc *desc, + struct nonce nonce) +{ + u8 key[POLY1305_KEY_SIZE]; + int ret; + + nonce.d[3] ^= BCH_NONCE_POLY; + + memset(key, 0, sizeof(key)); + ret = do_encrypt(c->chacha20, nonce, key, sizeof(key)); + if (ret) + return ret; + + desc->tfm = c->poly1305; + crypto_shash_init(desc); + crypto_shash_update(desc, key, sizeof(key)); + return 0; +} + +struct bch_csum bch2_checksum(struct bch_fs *c, unsigned type, + struct nonce nonce, const void *data, size_t len) +{ + switch (type) { + case BCH_CSUM_none: + case BCH_CSUM_crc32c_nonzero: + case BCH_CSUM_crc64_nonzero: + case BCH_CSUM_crc32c: + case BCH_CSUM_xxhash: + case BCH_CSUM_crc64: { + struct bch2_checksum_state state; + + state.type = type; + + bch2_checksum_init(&state); + bch2_checksum_update(&state, data, len); + + return (struct bch_csum) { .lo = cpu_to_le64(bch2_checksum_final(&state)) }; + } + + case BCH_CSUM_chacha20_poly1305_80: + case BCH_CSUM_chacha20_poly1305_128: { + SHASH_DESC_ON_STACK(desc, c->poly1305); + u8 digest[POLY1305_DIGEST_SIZE]; + struct bch_csum ret = { 0 }; + + gen_poly_key(c, desc, nonce); + + crypto_shash_update(desc, data, len); + crypto_shash_final(desc, digest); + + memcpy(&ret, digest, bch_crc_bytes[type]); + return ret; + } + default: + BUG(); + } +} + +int bch2_encrypt(struct bch_fs *c, unsigned type, + struct nonce nonce, void *data, size_t len) +{ + if (!bch2_csum_type_is_encryption(type)) + return 0; + + return do_encrypt(c->chacha20, nonce, data, len); +} + +static struct bch_csum __bch2_checksum_bio(struct bch_fs *c, unsigned type, + struct nonce nonce, struct bio *bio, + struct bvec_iter *iter) +{ + struct bio_vec bv; + + switch (type) { + case BCH_CSUM_none: + return (struct bch_csum) { 0 }; + case BCH_CSUM_crc32c_nonzero: + case BCH_CSUM_crc64_nonzero: + case BCH_CSUM_crc32c: + case BCH_CSUM_xxhash: + case BCH_CSUM_crc64: { + struct bch2_checksum_state state; + + state.type = type; + bch2_checksum_init(&state); + +#ifdef CONFIG_HIGHMEM + __bio_for_each_segment(bv, bio, *iter, *iter) { + void *p = kmap_local_page(bv.bv_page) + bv.bv_offset; + + bch2_checksum_update(&state, p, bv.bv_len); + kunmap_local(p); + } +#else + __bio_for_each_bvec(bv, bio, *iter, *iter) + bch2_checksum_update(&state, page_address(bv.bv_page) + bv.bv_offset, + bv.bv_len); +#endif + return (struct bch_csum) { .lo = cpu_to_le64(bch2_checksum_final(&state)) }; + } + + case BCH_CSUM_chacha20_poly1305_80: + case BCH_CSUM_chacha20_poly1305_128: { + SHASH_DESC_ON_STACK(desc, c->poly1305); + u8 digest[POLY1305_DIGEST_SIZE]; + struct bch_csum ret = { 0 }; + + gen_poly_key(c, desc, nonce); + +#ifdef CONFIG_HIGHMEM + __bio_for_each_segment(bv, bio, *iter, *iter) { + void *p = kmap_local_page(bv.bv_page) + bv.bv_offset; + + crypto_shash_update(desc, p, bv.bv_len); + kunmap_local(p); + } +#else + __bio_for_each_bvec(bv, bio, *iter, *iter) + crypto_shash_update(desc, + page_address(bv.bv_page) + bv.bv_offset, + bv.bv_len); +#endif + crypto_shash_final(desc, digest); + + memcpy(&ret, digest, bch_crc_bytes[type]); + return ret; + } + default: + BUG(); + } +} + +struct bch_csum bch2_checksum_bio(struct bch_fs *c, unsigned type, + struct nonce nonce, struct bio *bio) +{ + struct bvec_iter iter = bio->bi_iter; + + return __bch2_checksum_bio(c, type, nonce, bio, &iter); +} + +int __bch2_encrypt_bio(struct bch_fs *c, unsigned type, + struct nonce nonce, struct bio *bio) +{ + struct bio_vec bv; + struct bvec_iter iter; + struct scatterlist sgl[16], *sg = sgl; + size_t bytes = 0; + int ret = 0; + + if (!bch2_csum_type_is_encryption(type)) + return 0; + + sg_init_table(sgl, ARRAY_SIZE(sgl)); + + bio_for_each_segment(bv, bio, iter) { + if (sg == sgl + ARRAY_SIZE(sgl)) { + sg_mark_end(sg - 1); + + ret = do_encrypt_sg(c->chacha20, nonce, sgl, bytes); + if (ret) + return ret; + + nonce = nonce_add(nonce, bytes); + bytes = 0; + + sg_init_table(sgl, ARRAY_SIZE(sgl)); + sg = sgl; + } + + sg_set_page(sg++, bv.bv_page, bv.bv_len, bv.bv_offset); + bytes += bv.bv_len; + } + + sg_mark_end(sg - 1); + return do_encrypt_sg(c->chacha20, nonce, sgl, bytes); +} + +struct bch_csum bch2_checksum_merge(unsigned type, struct bch_csum a, + struct bch_csum b, size_t b_len) +{ + struct bch2_checksum_state state; + + state.type = type; + bch2_checksum_init(&state); + state.seed = le64_to_cpu(a.lo); + + BUG_ON(!bch2_checksum_mergeable(type)); + + while (b_len) { + unsigned page_len = min_t(unsigned, b_len, PAGE_SIZE); + + bch2_checksum_update(&state, + page_address(ZERO_PAGE(0)), page_len); + b_len -= page_len; + } + a.lo = cpu_to_le64(bch2_checksum_final(&state)); + a.lo ^= b.lo; + a.hi ^= b.hi; + return a; +} + +int bch2_rechecksum_bio(struct bch_fs *c, struct bio *bio, + struct bversion version, + struct bch_extent_crc_unpacked crc_old, + struct bch_extent_crc_unpacked *crc_a, + struct bch_extent_crc_unpacked *crc_b, + unsigned len_a, unsigned len_b, + unsigned new_csum_type) +{ + struct bvec_iter iter = bio->bi_iter; + struct nonce nonce = extent_nonce(version, crc_old); + struct bch_csum merged = { 0 }; + struct crc_split { + struct bch_extent_crc_unpacked *crc; + unsigned len; + unsigned csum_type; + struct bch_csum csum; + } splits[3] = { + { crc_a, len_a, new_csum_type, { 0 }}, + { crc_b, len_b, new_csum_type, { 0 } }, + { NULL, bio_sectors(bio) - len_a - len_b, new_csum_type, { 0 } }, + }, *i; + bool mergeable = crc_old.csum_type == new_csum_type && + bch2_checksum_mergeable(new_csum_type); + unsigned crc_nonce = crc_old.nonce; + + BUG_ON(len_a + len_b > bio_sectors(bio)); + BUG_ON(crc_old.uncompressed_size != bio_sectors(bio)); + BUG_ON(crc_is_compressed(crc_old)); + BUG_ON(bch2_csum_type_is_encryption(crc_old.csum_type) != + bch2_csum_type_is_encryption(new_csum_type)); + + for (i = splits; i < splits + ARRAY_SIZE(splits); i++) { + iter.bi_size = i->len << 9; + if (mergeable || i->crc) + i->csum = __bch2_checksum_bio(c, i->csum_type, + nonce, bio, &iter); + else + bio_advance_iter(bio, &iter, i->len << 9); + nonce = nonce_add(nonce, i->len << 9); + } + + if (mergeable) + for (i = splits; i < splits + ARRAY_SIZE(splits); i++) + merged = bch2_checksum_merge(new_csum_type, merged, + i->csum, i->len << 9); + else + merged = bch2_checksum_bio(c, crc_old.csum_type, + extent_nonce(version, crc_old), bio); + + if (bch2_crc_cmp(merged, crc_old.csum) && !c->opts.no_data_io) { + bch_err(c, "checksum error in %s() (memory corruption or bug?)\n" + "expected %0llx:%0llx got %0llx:%0llx (old type %s new type %s)", + __func__, + crc_old.csum.hi, + crc_old.csum.lo, + merged.hi, + merged.lo, + bch2_csum_types[crc_old.csum_type], + bch2_csum_types[new_csum_type]); + return -EIO; + } + + for (i = splits; i < splits + ARRAY_SIZE(splits); i++) { + if (i->crc) + *i->crc = (struct bch_extent_crc_unpacked) { + .csum_type = i->csum_type, + .compression_type = crc_old.compression_type, + .compressed_size = i->len, + .uncompressed_size = i->len, + .offset = 0, + .live_size = i->len, + .nonce = crc_nonce, + .csum = i->csum, + }; + + if (bch2_csum_type_is_encryption(new_csum_type)) + crc_nonce += i->len; + } + + return 0; +} + +/* BCH_SB_FIELD_crypt: */ + +static int bch2_sb_crypt_validate(struct bch_sb *sb, + struct bch_sb_field *f, + struct printbuf *err) +{ + struct bch_sb_field_crypt *crypt = field_to_type(f, crypt); + + if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) { + prt_printf(err, "wrong size (got %zu should be %zu)", + vstruct_bytes(&crypt->field), sizeof(*crypt)); + return -BCH_ERR_invalid_sb_crypt; + } + + if (BCH_CRYPT_KDF_TYPE(crypt)) { + prt_printf(err, "bad kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt)); + return -BCH_ERR_invalid_sb_crypt; + } + + return 0; +} + +static void bch2_sb_crypt_to_text(struct printbuf *out, struct bch_sb *sb, + struct bch_sb_field *f) +{ + struct bch_sb_field_crypt *crypt = field_to_type(f, crypt); + + prt_printf(out, "KFD: %llu", BCH_CRYPT_KDF_TYPE(crypt)); + prt_newline(out); + prt_printf(out, "scrypt n: %llu", BCH_KDF_SCRYPT_N(crypt)); + prt_newline(out); + prt_printf(out, "scrypt r: %llu", BCH_KDF_SCRYPT_R(crypt)); + prt_newline(out); + prt_printf(out, "scrypt p: %llu", BCH_KDF_SCRYPT_P(crypt)); + prt_newline(out); +} + +const struct bch_sb_field_ops bch_sb_field_ops_crypt = { + .validate = bch2_sb_crypt_validate, + .to_text = bch2_sb_crypt_to_text, +}; + +#ifdef __KERNEL__ +static int __bch2_request_key(char *key_description, struct bch_key *key) +{ + struct key *keyring_key; + const struct user_key_payload *ukp; + int ret; + + keyring_key = request_key(&key_type_user, key_description, NULL); + if (IS_ERR(keyring_key)) + return PTR_ERR(keyring_key); + + down_read(&keyring_key->sem); + ukp = dereference_key_locked(keyring_key); + if (ukp->datalen == sizeof(*key)) { + memcpy(key, ukp->data, ukp->datalen); + ret = 0; + } else { + ret = -EINVAL; + } + up_read(&keyring_key->sem); + key_put(keyring_key); + + return ret; +} +#else +#include <keyutils.h> + +static int __bch2_request_key(char *key_description, struct bch_key *key) +{ + key_serial_t key_id; + + key_id = request_key("user", key_description, NULL, + KEY_SPEC_SESSION_KEYRING); + if (key_id >= 0) + goto got_key; + + key_id = request_key("user", key_description, NULL, + KEY_SPEC_USER_KEYRING); + if (key_id >= 0) + goto got_key; + + key_id = request_key("user", key_description, NULL, + KEY_SPEC_USER_SESSION_KEYRING); + if (key_id >= 0) + goto got_key; + + return -errno; +got_key: + + if (keyctl_read(key_id, (void *) key, sizeof(*key)) != sizeof(*key)) + return -1; + + return 0; +} + +#include "../crypto.h" +#endif + +int bch2_request_key(struct bch_sb *sb, struct bch_key *key) +{ + struct printbuf key_description = PRINTBUF; + int ret; + + prt_printf(&key_description, "bcachefs:"); + pr_uuid(&key_description, sb->user_uuid.b); + + ret = __bch2_request_key(key_description.buf, key); + printbuf_exit(&key_description); + +#ifndef __KERNEL__ + if (ret) { + char *passphrase = read_passphrase("Enter passphrase: "); + struct bch_encrypted_key sb_key; + + bch2_passphrase_check(sb, passphrase, + key, &sb_key); + ret = 0; + } +#endif + + /* stash with memfd, pass memfd fd to mount */ + + return ret; +} + +#ifndef __KERNEL__ +int bch2_revoke_key(struct bch_sb *sb) +{ + key_serial_t key_id; + struct printbuf key_description = PRINTBUF; + + prt_printf(&key_description, "bcachefs:"); + pr_uuid(&key_description, sb->user_uuid.b); + + key_id = request_key("user", key_description.buf, NULL, KEY_SPEC_USER_KEYRING); + printbuf_exit(&key_description); + if (key_id < 0) + return errno; + + keyctl_revoke(key_id); + + return 0; +} +#endif + +int bch2_decrypt_sb_key(struct bch_fs *c, + struct bch_sb_field_crypt *crypt, + struct bch_key *key) +{ + struct bch_encrypted_key sb_key = crypt->key; + struct bch_key user_key; + int ret = 0; + + /* is key encrypted? */ + if (!bch2_key_is_encrypted(&sb_key)) + goto out; + + ret = bch2_request_key(c->disk_sb.sb, &user_key); + if (ret) { + bch_err(c, "error requesting encryption key: %s", bch2_err_str(ret)); + goto err; + } + + /* decrypt real key: */ + ret = bch2_chacha_encrypt_key(&user_key, bch2_sb_key_nonce(c), + &sb_key, sizeof(sb_key)); + if (ret) + goto err; + + if (bch2_key_is_encrypted(&sb_key)) { + bch_err(c, "incorrect encryption key"); + ret = -EINVAL; + goto err; + } +out: + *key = sb_key.key; +err: + memzero_explicit(&sb_key, sizeof(sb_key)); + memzero_explicit(&user_key, sizeof(user_key)); + return ret; +} + +static int bch2_alloc_ciphers(struct bch_fs *c) +{ + int ret; + + if (!c->chacha20) + c->chacha20 = crypto_alloc_sync_skcipher("chacha20", 0, 0); + ret = PTR_ERR_OR_ZERO(c->chacha20); + + if (ret) { + bch_err(c, "error requesting chacha20 module: %s", bch2_err_str(ret)); + return ret; + } + + if (!c->poly1305) + c->poly1305 = crypto_alloc_shash("poly1305", 0, 0); + ret = PTR_ERR_OR_ZERO(c->poly1305); + + if (ret) { + bch_err(c, "error requesting poly1305 module: %s", bch2_err_str(ret)); + return ret; + } + + return 0; +} + +int bch2_disable_encryption(struct bch_fs *c) +{ + struct bch_sb_field_crypt *crypt; + struct bch_key key; + int ret = -EINVAL; + + mutex_lock(&c->sb_lock); + + crypt = bch2_sb_field_get(c->disk_sb.sb, crypt); + if (!crypt) + goto out; + + /* is key encrypted? */ + ret = 0; + if (bch2_key_is_encrypted(&crypt->key)) + goto out; + + ret = bch2_decrypt_sb_key(c, crypt, &key); + if (ret) + goto out; + + crypt->key.magic = cpu_to_le64(BCH_KEY_MAGIC); + crypt->key.key = key; + + SET_BCH_SB_ENCRYPTION_TYPE(c->disk_sb.sb, 0); + bch2_write_super(c); +out: + mutex_unlock(&c->sb_lock); + + return ret; +} + +int bch2_enable_encryption(struct bch_fs *c, bool keyed) +{ + struct bch_encrypted_key key; + struct bch_key user_key; + struct bch_sb_field_crypt *crypt; + int ret = -EINVAL; + + mutex_lock(&c->sb_lock); + + /* Do we already have an encryption key? */ + if (bch2_sb_field_get(c->disk_sb.sb, crypt)) + goto err; + + ret = bch2_alloc_ciphers(c); + if (ret) + goto err; + + key.magic = cpu_to_le64(BCH_KEY_MAGIC); + get_random_bytes(&key.key, sizeof(key.key)); + + if (keyed) { + ret = bch2_request_key(c->disk_sb.sb, &user_key); + if (ret) { + bch_err(c, "error requesting encryption key: %s", bch2_err_str(ret)); + goto err; + } + + ret = bch2_chacha_encrypt_key(&user_key, bch2_sb_key_nonce(c), + &key, sizeof(key)); + if (ret) + goto err; + } + + ret = crypto_skcipher_setkey(&c->chacha20->base, + (void *) &key.key, sizeof(key.key)); + if (ret) + goto err; + + crypt = bch2_sb_field_resize(&c->disk_sb, crypt, + sizeof(*crypt) / sizeof(u64)); + if (!crypt) { + ret = -BCH_ERR_ENOSPC_sb_crypt; + goto err; + } + + crypt->key = key; + + /* write superblock */ + SET_BCH_SB_ENCRYPTION_TYPE(c->disk_sb.sb, 1); + bch2_write_super(c); +err: + mutex_unlock(&c->sb_lock); + memzero_explicit(&user_key, sizeof(user_key)); + memzero_explicit(&key, sizeof(key)); + return ret; +} + +void bch2_fs_encryption_exit(struct bch_fs *c) +{ + if (!IS_ERR_OR_NULL(c->poly1305)) + crypto_free_shash(c->poly1305); + if (!IS_ERR_OR_NULL(c->chacha20)) + crypto_free_sync_skcipher(c->chacha20); + if (!IS_ERR_OR_NULL(c->sha256)) + crypto_free_shash(c->sha256); +} + +int bch2_fs_encryption_init(struct bch_fs *c) +{ + struct bch_sb_field_crypt *crypt; + struct bch_key key; + int ret = 0; + + c->sha256 = crypto_alloc_shash("sha256", 0, 0); + ret = PTR_ERR_OR_ZERO(c->sha256); + if (ret) { + bch_err(c, "error requesting sha256 module: %s", bch2_err_str(ret)); + goto out; + } + + crypt = bch2_sb_field_get(c->disk_sb.sb, crypt); + if (!crypt) + goto out; + + ret = bch2_alloc_ciphers(c); + if (ret) + goto out; + + ret = bch2_decrypt_sb_key(c, crypt, &key); + if (ret) + goto out; + + ret = crypto_skcipher_setkey(&c->chacha20->base, + (void *) &key.key, sizeof(key.key)); + if (ret) + goto out; +out: + memzero_explicit(&key, sizeof(key)); + return ret; +} |