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Subject[PATCH 4.19 179/271] crypto: crypto4xx - block ciphers should only accept complete blocks
Date
From: Christian Lamparter <chunkeey@gmail.com>

commit 0f7a81374060828280fcfdfbaa162cb559017f9f upstream.

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 <ebiggers@kernel.org>
Cc: stable@vger.kernel.org [4.19, 5.0 and 5.1]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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(-)

--- 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(str
}

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
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_requ
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,
--- a/drivers/crypto/amcc/crypto4xx_core.c
+++ b/drivers/crypto/amcc/crypto4xx_core.c
@@ -1153,8 +1153,8 @@ static struct crypto4xx_alg_common crypt
.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,
} },
@@ -1173,8 +1173,8 @@ static struct crypto4xx_alg_common crypt
.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,
} },
@@ -1233,8 +1233,8 @@ static struct crypto4xx_alg_common crypt
.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,
} },
@@ -1253,8 +1253,8 @@ static struct crypto4xx_alg_common crypt
.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,
} },
--- a/drivers/crypto/amcc/crypto4xx_core.h
+++ b/drivers/crypto/amcc/crypto4xx_core.h
@@ -179,10 +179,12 @@ int crypto4xx_setkey_rfc3686(struct cryp
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);

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