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crypto: geode-aes - switch to skcipher for cbc(aes) fallback

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commit 504582e8e40b90b8f8c58783e2d1e4f6a2b71a3a upstream.

Commit 79c65d179a ("crypto: cbc - Convert to skcipher") updated
the generic CBC template wrapper from a blkcipher to a skcipher algo,
to get away from the deprecated blkcipher interface. However, as a side
effect, drivers that instantiate CBC transforms using the blkcipher as
a fallback no longer work, since skciphers can wrap blkciphers but not
the other way around. This broke the geode-aes driver.

So let's fix it by moving to the sync skcipher interface when allocating
the fallback. At the same time, align with the generic API for ECB and
CBC by rejecting inputs that are not a multiple of the AES block size.

Fixes: 79c65d179a ("crypto: cbc - Convert to skcipher")
Cc: <stable@vger.kernel.org> # v4.20+ ONLY
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Florian Bezdeka <florian@bezdeka.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Florian Bezdeka <florian@bezdeka.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ard Biesheuvel 2019-10-05 11:11:10 +02:00 committed by Greg Kroah-Hartman
parent 8d9aa36cc7
commit 03e520dcdc
2 changed files with 35 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

57
drivers/crypto/geode-aes.c
View file

@ -14,6 +14,7 @@
#include <linux/spinlock.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/skcipher.h>
#include <linux/io.h>
#include <linux/delay.h>
@ -170,13 +171,15 @@ static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
/*
* The requested key size is not supported by HW, do a fallback
*/
op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
crypto_skcipher_clear_flags(op->fallback.blk, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(op->fallback.blk,
tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
ret = crypto_skcipher_setkey(op->fallback.blk, key, len);
if (ret) {
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
tfm->crt_flags |= crypto_skcipher_get_flags(op->fallback.blk) &
CRYPTO_TFM_RES_MASK;
}
return ret;
}
@ -185,33 +188,28 @@ static int fallback_blk_dec(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
unsigned int ret;
struct crypto_blkcipher *tfm;
struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
SKCIPHER_REQUEST_ON_STACK(req, op->fallback.blk);
tfm = desc->tfm;
desc->tfm = op->fallback.blk;
skcipher_request_set_tfm(req, op->fallback.blk);
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
desc->tfm = tfm;
return ret;
return crypto_skcipher_decrypt(req);
}
static int fallback_blk_enc(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
unsigned int ret;
struct crypto_blkcipher *tfm;
struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
SKCIPHER_REQUEST_ON_STACK(req, op->fallback.blk);
tfm = desc->tfm;
desc->tfm = op->fallback.blk;
skcipher_request_set_tfm(req, op->fallback.blk);
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
desc->tfm = tfm;
return ret;
return crypto_skcipher_encrypt(req);
}
static void
@ -311,6 +309,9 @@ geode_cbc_decrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (nbytes % AES_BLOCK_SIZE)
return -EINVAL;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_dec(desc, dst, src, nbytes);
@ -343,6 +344,9 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (nbytes % AES_BLOCK_SIZE)
return -EINVAL;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_enc(desc, dst, src, nbytes);
@ -370,8 +374,9 @@ static int fallback_init_blk(struct crypto_tfm *tfm)
const char *name = crypto_tfm_alg_name(tfm);
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
op->fallback.blk = crypto_alloc_blkcipher(name, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
op->fallback.blk = crypto_alloc_skcipher(name, 0,
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(op->fallback.blk)) {
printk(KERN_ERR "Error allocating fallback algo %s\n", name);
@ -385,7 +390,7 @@ static void fallback_exit_blk(struct crypto_tfm *tfm)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
crypto_free_blkcipher(op->fallback.blk);
crypto_free_skcipher(op->fallback.blk);
op->fallback.blk = NULL;
}
@ -424,6 +429,9 @@ geode_ecb_decrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (nbytes % AES_BLOCK_SIZE)
return -EINVAL;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_dec(desc, dst, src, nbytes);
@ -454,6 +462,9 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (nbytes % AES_BLOCK_SIZE)
return -EINVAL;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_enc(desc, dst, src, nbytes);

2
drivers/crypto/geode-aes.h
View file

@ -64,7 +64,7 @@ struct geode_aes_op {
u8 *iv;
union {
struct crypto_blkcipher *blk;
struct crypto_skcipher *blk;
struct crypto_cipher *cip;
} fallback;
u32 keylen;