From 0f7a81374060828280fcfdfbaa162cb559017f9f Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Sat, 18 May 2019 23:28:12 +0200 Subject: crypto: crypto4xx - block ciphers should only accept complete blocks The hardware automatically zero pads incomplete block ciphers blocks without raising any errors. This is a screw-up. This was noticed by CONFIG_CRYPTO_MANAGER_EXTRA_TESTS tests that sent a incomplete blocks and expect them to fail. This fixes: cbc-aes-ppc4xx encryption unexpectedly succeeded on test vector "random: len=2409 klen=32"; expected_error=-22, cfg="random: may_sleep use_digest src_divs=[96.90%@+2295, 2.34%@+4066, 0.32%@alignmask+12, 0.34%@+4087, 0.9%@alignmask+1787, 0.1%@+3767] iv_offset=6" ecb-aes-ppc4xx encryption unexpectedly succeeded on test vector "random: len=1011 klen=32"; expected_error=-22, cfg="random: may_sleep use_digest src_divs=[100.0%@alignmask+20] dst_divs=[3.12%@+3001, 96.88%@+4070]" Cc: Eric Biggers Cc: stable@vger.kernel.org [4.19, 5.0 and 5.1] Signed-off-by: Christian Lamparter Signed-off-by: Herbert Xu --- drivers/crypto/amcc/crypto4xx_alg.c | 36 +++++++++++++++++++++++++----------- drivers/crypto/amcc/crypto4xx_core.c | 16 ++++++++-------- drivers/crypto/amcc/crypto4xx_core.h | 10 ++++++---- 3 files changed, 39 insertions(+), 23 deletions(-) (limited to 'drivers/crypto/amcc') diff --git a/drivers/crypto/amcc/crypto4xx_alg.c b/drivers/crypto/amcc/crypto4xx_alg.c index 307f5cfa9ba4..26f86fd7532b 100644 --- a/drivers/crypto/amcc/crypto4xx_alg.c +++ b/drivers/crypto/amcc/crypto4xx_alg.c @@ -76,12 +76,16 @@ static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, } static inline int crypto4xx_crypt(struct skcipher_request *req, - const unsigned int ivlen, bool decrypt) + const unsigned int ivlen, bool decrypt, + bool check_blocksize) { struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req); struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher); __le32 iv[AES_IV_SIZE]; + if (check_blocksize && !IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE)) + return -EINVAL; + if (ivlen) crypto4xx_memcpy_to_le32(iv, req->iv, ivlen); @@ -90,24 +94,34 @@ static inline int crypto4xx_crypt(struct skcipher_request *req, ctx->sa_len, 0, NULL); } -int crypto4xx_encrypt_noiv(struct skcipher_request *req) +int crypto4xx_encrypt_noiv_block(struct skcipher_request *req) +{ + return crypto4xx_crypt(req, 0, false, true); +} + +int crypto4xx_encrypt_iv_stream(struct skcipher_request *req) +{ + return crypto4xx_crypt(req, AES_IV_SIZE, false, false); +} + +int crypto4xx_decrypt_noiv_block(struct skcipher_request *req) { - return crypto4xx_crypt(req, 0, false); + return crypto4xx_crypt(req, 0, true, true); } -int crypto4xx_encrypt_iv(struct skcipher_request *req) +int crypto4xx_decrypt_iv_stream(struct skcipher_request *req) { - return crypto4xx_crypt(req, AES_IV_SIZE, false); + return crypto4xx_crypt(req, AES_IV_SIZE, true, false); } -int crypto4xx_decrypt_noiv(struct skcipher_request *req) +int crypto4xx_encrypt_iv_block(struct skcipher_request *req) { - return crypto4xx_crypt(req, 0, true); + return crypto4xx_crypt(req, AES_IV_SIZE, false, true); } -int crypto4xx_decrypt_iv(struct skcipher_request *req) +int crypto4xx_decrypt_iv_block(struct skcipher_request *req) { - return crypto4xx_crypt(req, AES_IV_SIZE, true); + return crypto4xx_crypt(req, AES_IV_SIZE, true, true); } /** @@ -278,8 +292,8 @@ crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt) return ret; } - return encrypt ? crypto4xx_encrypt_iv(req) - : crypto4xx_decrypt_iv(req); + return encrypt ? crypto4xx_encrypt_iv_stream(req) + : crypto4xx_decrypt_iv_stream(req); } static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx, diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c index 5f2709cffc5b..45f65d638caf 100644 --- a/drivers/crypto/amcc/crypto4xx_core.c +++ b/drivers/crypto/amcc/crypto4xx_core.c @@ -1219,8 +1219,8 @@ static struct crypto4xx_alg_common crypto4xx_alg[] = { .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_IV_SIZE, .setkey = crypto4xx_setkey_aes_cbc, - .encrypt = crypto4xx_encrypt_iv, - .decrypt = crypto4xx_decrypt_iv, + .encrypt = crypto4xx_encrypt_iv_block, + .decrypt = crypto4xx_decrypt_iv_block, .init = crypto4xx_sk_init, .exit = crypto4xx_sk_exit, } }, @@ -1239,8 +1239,8 @@ static struct crypto4xx_alg_common crypto4xx_alg[] = { .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_IV_SIZE, .setkey = crypto4xx_setkey_aes_cfb, - .encrypt = crypto4xx_encrypt_iv, - .decrypt = crypto4xx_decrypt_iv, + .encrypt = crypto4xx_encrypt_iv_stream, + .decrypt = crypto4xx_decrypt_iv_stream, .init = crypto4xx_sk_init, .exit = crypto4xx_sk_exit, } }, @@ -1299,8 +1299,8 @@ static struct crypto4xx_alg_common crypto4xx_alg[] = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = crypto4xx_setkey_aes_ecb, - .encrypt = crypto4xx_encrypt_noiv, - .decrypt = crypto4xx_decrypt_noiv, + .encrypt = crypto4xx_encrypt_noiv_block, + .decrypt = crypto4xx_decrypt_noiv_block, .init = crypto4xx_sk_init, .exit = crypto4xx_sk_exit, } }, @@ -1319,8 +1319,8 @@ static struct crypto4xx_alg_common crypto4xx_alg[] = { .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_IV_SIZE, .setkey = crypto4xx_setkey_aes_ofb, - .encrypt = crypto4xx_encrypt_iv, - .decrypt = crypto4xx_decrypt_iv, + .encrypt = crypto4xx_encrypt_iv_stream, + .decrypt = crypto4xx_decrypt_iv_stream, .init = crypto4xx_sk_init, .exit = crypto4xx_sk_exit, } }, diff --git a/drivers/crypto/amcc/crypto4xx_core.h b/drivers/crypto/amcc/crypto4xx_core.h index c624f8cd3d2e..8ca082666736 100644 --- a/drivers/crypto/amcc/crypto4xx_core.h +++ b/drivers/crypto/amcc/crypto4xx_core.h @@ -182,10 +182,12 @@ int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher, const u8 *key, unsigned int keylen); int crypto4xx_encrypt_ctr(struct skcipher_request *req); int crypto4xx_decrypt_ctr(struct skcipher_request *req); -int crypto4xx_encrypt_iv(struct skcipher_request *req); -int crypto4xx_decrypt_iv(struct skcipher_request *req); -int crypto4xx_encrypt_noiv(struct skcipher_request *req); -int crypto4xx_decrypt_noiv(struct skcipher_request *req); +int crypto4xx_encrypt_iv_stream(struct skcipher_request *req); +int crypto4xx_decrypt_iv_stream(struct skcipher_request *req); +int crypto4xx_encrypt_iv_block(struct skcipher_request *req); +int crypto4xx_decrypt_iv_block(struct skcipher_request *req); +int crypto4xx_encrypt_noiv_block(struct skcipher_request *req); +int crypto4xx_decrypt_noiv_block(struct skcipher_request *req); int crypto4xx_rfc3686_encrypt(struct skcipher_request *req); int crypto4xx_rfc3686_decrypt(struct skcipher_request *req); int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm); -- cgit v1.2.3-59-g8ed1b