From 4dfea4f0d7f13309d2ee112a2584210cae4320c6 Mon Sep 17 00:00:00 2001 From: Tyler Hicks Date: Thu, 9 May 2013 16:55:07 -0700 Subject: [PATCH] eCryptfs: Use the ablkcipher crypto API Make the switch from the blkcipher kernel crypto interface to the ablkcipher interface. encrypt_scatterlist() and decrypt_scatterlist() now use the ablkcipher interface but, from the eCryptfs standpoint, still treat the crypto operation as a synchronous operation. They submit the async request and then wait until the operation is finished before they return. Most of the changes are contained inside those two functions. Despite waiting for the completion of the crypto operation, the ablkcipher interface provides performance increases in most cases when used on AES-NI capable hardware. Signed-off-by: Tyler Hicks Acked-by: Colin King Reviewed-by: Zeev Zilberman Cc: Dustin Kirkland Cc: Tim Chen Cc: Ying Huang Cc: Thieu Le Cc: Li Wang Cc: Jarkko Sakkinen --- fs/ecryptfs/crypto.c | 141 ++++++++++++++++++++++++---------- fs/ecryptfs/ecryptfs_kernel.h | 3 +- 2 files changed, 103 insertions(+), 41 deletions(-) diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index d5c25db4398f..f71ec125290d 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -243,7 +243,7 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat) struct ecryptfs_key_sig *key_sig, *key_sig_tmp; if (crypt_stat->tfm) - crypto_free_blkcipher(crypt_stat->tfm); + crypto_free_ablkcipher(crypt_stat->tfm); if (crypt_stat->hash_tfm) crypto_free_hash(crypt_stat->hash_tfm); list_for_each_entry_safe(key_sig, key_sig_tmp, @@ -319,6 +319,22 @@ int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, return i; } +struct extent_crypt_result { + struct completion completion; + int rc; +}; + +static void extent_crypt_complete(struct crypto_async_request *req, int rc) +{ + struct extent_crypt_result *ecr = req->data; + + if (rc == -EINPROGRESS) + return; + + ecr->rc = rc; + complete(&ecr->completion); +} + /** * encrypt_scatterlist * @crypt_stat: Pointer to the crypt_stat struct to initialize. @@ -334,11 +350,8 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat, struct scatterlist *src_sg, int size, unsigned char *iv) { - struct blkcipher_desc desc = { - .tfm = crypt_stat->tfm, - .info = iv, - .flags = CRYPTO_TFM_REQ_MAY_SLEEP - }; + struct ablkcipher_request *req = NULL; + struct extent_crypt_result ecr; int rc = 0; BUG_ON(!crypt_stat || !crypt_stat->tfm @@ -349,24 +362,47 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat, ecryptfs_dump_hex(crypt_stat->key, crypt_stat->key_size); } - /* Consider doing this once, when the file is opened */ + + init_completion(&ecr.completion); + mutex_lock(&crypt_stat->cs_tfm_mutex); - if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) { - rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key, - crypt_stat->key_size); - crypt_stat->flags |= ECRYPTFS_KEY_SET; - } - if (rc) { - ecryptfs_printk(KERN_ERR, "Error setting key; rc = [%d]\n", - rc); + req = ablkcipher_request_alloc(crypt_stat->tfm, GFP_NOFS); + if (!req) { mutex_unlock(&crypt_stat->cs_tfm_mutex); - rc = -EINVAL; + rc = -ENOMEM; goto out; } - ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes.\n", size); - crypto_blkcipher_encrypt_iv(&desc, dest_sg, src_sg, size); + + ablkcipher_request_set_callback(req, + CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, + extent_crypt_complete, &ecr); + /* Consider doing this once, when the file is opened */ + if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) { + rc = crypto_ablkcipher_setkey(crypt_stat->tfm, crypt_stat->key, + crypt_stat->key_size); + if (rc) { + ecryptfs_printk(KERN_ERR, + "Error setting key; rc = [%d]\n", + rc); + mutex_unlock(&crypt_stat->cs_tfm_mutex); + rc = -EINVAL; + goto out; + } + crypt_stat->flags |= ECRYPTFS_KEY_SET; + } mutex_unlock(&crypt_stat->cs_tfm_mutex); + ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes.\n", size); + ablkcipher_request_set_crypt(req, src_sg, dest_sg, size, iv); + rc = crypto_ablkcipher_encrypt(req); + if (rc == -EINPROGRESS || rc == -EBUSY) { + struct extent_crypt_result *ecr = req->base.data; + + wait_for_completion(&ecr->completion); + rc = ecr->rc; + INIT_COMPLETION(ecr->completion); + } out: + ablkcipher_request_free(req); return rc; } @@ -624,35 +660,61 @@ static int decrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat, struct scatterlist *src_sg, int size, unsigned char *iv) { - struct blkcipher_desc desc = { - .tfm = crypt_stat->tfm, - .info = iv, - .flags = CRYPTO_TFM_REQ_MAY_SLEEP - }; + struct ablkcipher_request *req = NULL; + struct extent_crypt_result ecr; int rc = 0; - /* Consider doing this once, when the file is opened */ + BUG_ON(!crypt_stat || !crypt_stat->tfm + || !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)); + if (unlikely(ecryptfs_verbosity > 0)) { + ecryptfs_printk(KERN_DEBUG, "Key size [%zd]; key:\n", + crypt_stat->key_size); + ecryptfs_dump_hex(crypt_stat->key, + crypt_stat->key_size); + } + + init_completion(&ecr.completion); + mutex_lock(&crypt_stat->cs_tfm_mutex); - rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key, - crypt_stat->key_size); - if (rc) { - ecryptfs_printk(KERN_ERR, "Error setting key; rc = [%d]\n", - rc); + req = ablkcipher_request_alloc(crypt_stat->tfm, GFP_NOFS); + if (!req) { mutex_unlock(&crypt_stat->cs_tfm_mutex); - rc = -EINVAL; + rc = -ENOMEM; goto out; } - ecryptfs_printk(KERN_DEBUG, "Decrypting [%d] bytes.\n", size); - rc = crypto_blkcipher_decrypt_iv(&desc, dest_sg, src_sg, size); + + ablkcipher_request_set_callback(req, + CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, + extent_crypt_complete, &ecr); + /* Consider doing this once, when the file is opened */ + if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) { + rc = crypto_ablkcipher_setkey(crypt_stat->tfm, crypt_stat->key, + crypt_stat->key_size); + if (rc) { + ecryptfs_printk(KERN_ERR, + "Error setting key; rc = [%d]\n", + rc); + mutex_unlock(&crypt_stat->cs_tfm_mutex); + rc = -EINVAL; + goto out; + } + crypt_stat->flags |= ECRYPTFS_KEY_SET; + } mutex_unlock(&crypt_stat->cs_tfm_mutex); - if (rc) { - ecryptfs_printk(KERN_ERR, "Error decrypting; rc = [%d]\n", - rc); - goto out; + ecryptfs_printk(KERN_DEBUG, "Decrypting [%d] bytes.\n", size); + ablkcipher_request_set_crypt(req, src_sg, dest_sg, size, iv); + rc = crypto_ablkcipher_decrypt(req); + if (rc == -EINPROGRESS || rc == -EBUSY) { + struct extent_crypt_result *ecr = req->base.data; + + wait_for_completion(&ecr->completion); + rc = ecr->rc; + INIT_COMPLETION(ecr->completion); } - rc = size; out: + ablkcipher_request_free(req); return rc; + } /** @@ -746,8 +808,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat) crypt_stat->cipher, "cbc"); if (rc) goto out_unlock; - crypt_stat->tfm = crypto_alloc_blkcipher(full_alg_name, 0, - CRYPTO_ALG_ASYNC); + crypt_stat->tfm = crypto_alloc_ablkcipher(full_alg_name, 0, 0); kfree(full_alg_name); if (IS_ERR(crypt_stat->tfm)) { rc = PTR_ERR(crypt_stat->tfm); @@ -757,7 +818,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat) crypt_stat->cipher); goto out_unlock; } - crypto_blkcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY); + crypto_ablkcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY); rc = 0; out_unlock: mutex_unlock(&crypt_stat->cs_tfm_mutex); diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index dd299b389d4e..f622a733f7ad 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -38,6 +38,7 @@ #include #include #include +#include #define ECRYPTFS_DEFAULT_IV_BYTES 16 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 @@ -233,7 +234,7 @@ struct ecryptfs_crypt_stat { size_t extent_shift; unsigned int extent_mask; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; - struct crypto_blkcipher *tfm; + struct crypto_ablkcipher *tfm; struct crypto_hash *hash_tfm; /* Crypto context for generating * the initialization vectors */ unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; -- 2.30.2