Phil?
On 11/17/2016 10:58 AM, Horia Geanta Neag wrote:
> Forgot to Cc Michael Weiser.
>
> On 11/17/2016 10:20 AM, Horia Geantă wrote:
>> ablkcipher API is not completely removed from kernels <= v4.9.
>> Thus it's still valid to use ablkcipher algorithms.
>>
>> Fix the case when implementers register ablkcipher algorithms
>> and cryptodev casts them to skcipher without checking their type.
>>
>> Note: alg returned by crypto_ablkcipher_alg() is no longer checked
>> to be non-NULL. This is guaranteed by the fact that ablkcipher_tfm
>> (out->async.s) is valid.
>>
>> Fixes: cb186f682679 ("Support skcipher in addition to ablkcipher API")
>> Tested-by: Cristian Stoica <cristian.sto...@nxp.com>
>> Signed-off-by: Horia Geantă <horia.gea...@nxp.com>
>> ---
>> cipherapi.h | 4 ----
>> cryptlib.c | 56 ++++++++++++++++++++++++++++++++++++++++++++------------
>> 2 files changed, 44 insertions(+), 16 deletions(-)
>>
>> diff --git a/cipherapi.h b/cipherapi.h
>> index 07d992333ad7..b6ed6c279350 100644
>> --- a/cipherapi.h
>> +++ b/cipherapi.h
>> @@ -6,12 +6,10 @@
>> #if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
>> # include <linux/crypto.h>
>>
>> -typedef struct ablkcipher_alg cryptodev_blkcipher_alg_t;
>> typedef struct crypto_ablkcipher cryptodev_crypto_blkcipher_t;
>> typedef struct ablkcipher_request cryptodev_blkcipher_request_t;
>>
>> # define cryptodev_crypto_alloc_blkcipher crypto_alloc_ablkcipher
>> -# define cryptodev_crypto_blkcipher_alg crypto_ablkcipher_alg
>> # define cryptodev_crypto_blkcipher_blocksize crypto_ablkcipher_blocksize
>> # define cryptodev_crypto_blkcipher_ivsize crypto_ablkcipher_ivsize
>> # define cryptodev_crypto_blkcipher_alignmask crypto_ablkcipher_alignmask
>> @@ -37,12 +35,10 @@ static inline void
>> cryptodev_blkcipher_request_free(cryptodev_blkcipher_request_
>> #else
>> #include <crypto/skcipher.h>
>>
>> -typedef struct skcipher_alg cryptodev_blkcipher_alg_t;
>> typedef struct crypto_skcipher cryptodev_crypto_blkcipher_t;
>> typedef struct skcipher_request cryptodev_blkcipher_request_t;
>>
>> # define cryptodev_crypto_alloc_blkcipher crypto_alloc_skcipher
>> -# define cryptodev_crypto_blkcipher_alg crypto_skcipher_alg
>> # define cryptodev_crypto_blkcipher_blocksize crypto_skcipher_blocksize
>> # define cryptodev_crypto_blkcipher_ivsize crypto_skcipher_ivsize
>> # define cryptodev_crypto_blkcipher_alignmask crypto_skcipher_alignmask
>> diff --git a/cryptlib.c b/cryptlib.c
>> index 5a6e0ba5fe88..2c6028ee2b23 100644
>> --- a/cryptlib.c
>> +++ b/cryptlib.c
>> @@ -38,6 +38,7 @@
>> #include "cryptodev_int.h"
>> #include "cipherapi.h"
>>
>> +extern const struct crypto_type crypto_givcipher_type;
>>
>> static void cryptodev_complete(struct crypto_async_request *req, int err)
>> {
>> @@ -121,6 +122,19 @@ error:
>> return ret;
>> }
>>
>> +/* Was correct key length supplied? */
>> +static int check_key_size(size_t keylen, const char *alg_name,
>> + unsigned int min_keysize, unsigned int max_keysize)
>> +{
>> + if (max_keysize > 0 && unlikely((keylen < min_keysize) ||
>> + (keylen > max_keysize))) {
>> + ddebug(1, "Wrong keylen '%zu' for algorithm '%s'. Use %u to
>> %u.",
>> + keylen, alg_name, min_keysize, max_keysize);
>> + return -EINVAL;
>> + }
>> +
>> + return 0;
>> +}
>>
>> int cryptodev_cipher_init(struct cipher_data *out, const char *alg_name,
>> uint8_t *keyp, size_t keylen, int stream, int
>> aead)
>> @@ -128,7 +142,12 @@ int cryptodev_cipher_init(struct cipher_data *out,
>> const char *alg_name,
>> int ret;
>>
>> if (aead == 0) {
>> - cryptodev_blkcipher_alg_t *alg;
>> + unsigned int min_keysize, max_keysize;
>> +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
>> + struct crypto_tfm *tfm;
>> +#else
>> + struct ablkcipher_alg *alg;
>> +#endif
>>
>> out->async.s = cryptodev_crypto_alloc_blkcipher(alg_name, 0, 0);
>> if (unlikely(IS_ERR(out->async.s))) {
>> @@ -136,18 +155,31 @@ int cryptodev_cipher_init(struct cipher_data *out,
>> const char *alg_name,
>> return -EINVAL;
>> }
>>
>> - alg = cryptodev_crypto_blkcipher_alg(out->async.s);
>> - if (alg != NULL) {
>> - /* Was correct key length supplied? */
>> - if (alg->max_keysize > 0 &&
>> - unlikely((keylen < alg->min_keysize) ||
>> - (keylen > alg->max_keysize))) {
>> - ddebug(1, "Wrong keylen '%zu' for algorithm
>> '%s'. Use %u to %u.",
>> - keylen, alg_name,
>> alg->min_keysize, alg->max_keysize);
>> - ret = -EINVAL;
>> - goto error;
>> - }
>> +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
>> + tfm = crypto_skcipher_tfm(out->async.s);
>> + if ((tfm->__crt_alg->cra_type == &crypto_ablkcipher_type) ||
>> + (tfm->__crt_alg->cra_type == &crypto_givcipher_type)) {
>> + struct ablkcipher_alg *alg;
>> +
>> + alg = &tfm->__crt_alg->cra_ablkcipher;
>> + min_keysize = alg->min_keysize;
>> + max_keysize = alg->max_keysize;
>> + } else {
>> + struct skcipher_alg *alg;
>> +
>> + alg = crypto_skcipher_alg(out->async.s);
>> + min_keysize = alg->min_keysize;
>> + max_keysize = alg->max_keysize;
>> }
>> +#else
>> + alg = crypto_ablkcipher_alg(out->async.s);
>> + min_keysize = alg->min_keysize;
>> + max_keysize = alg->max_keysize;
>> +#endif
>> + ret = check_key_size(keylen, alg_name, min_keysize,
>> + max_keysize);
>> + if (ret)
>> + goto error;
>>
>> out->blocksize =
>> cryptodev_crypto_blkcipher_blocksize(out->async.s);
>> out->ivsize = cryptodev_crypto_blkcipher_ivsize(out->async.s);
>>
>
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