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crypto: skcipher - Add missing API setkey checks 

The API setkey checks for key sizes and alignment went AWOL during the
skcipher conversion.  This patch restores them.

Cc: <stable@vger.kernel.org>
Fixes: 4e6c3df4d7 ("crypto: skcipher - Add low-level skcipher...")
Reported-by: Baozeng <sploving1@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2017-05-10 03:48:23 +08:00
parent 2ea659a9ef
commit 9933e113c2
1 changed files with 39 additions and 1 deletions
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40
crypto/skcipher.c
View File

@ -764,6 +764,44 @@ static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
return 0;
}
static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
unsigned long alignmask = crypto_skcipher_alignmask(tfm);
struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
u8 *buffer, *alignbuffer;
unsigned long absize;
int ret;
absize = keylen + alignmask;
buffer = kmalloc(absize, GFP_ATOMIC);
if (!buffer)
return -ENOMEM;
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen);
ret = cipher->setkey(tfm, alignbuffer, keylen);
kzfree(buffer);
return ret;
}
static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
unsigned long alignmask = crypto_skcipher_alignmask(tfm);
if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
if ((unsigned long)key & alignmask)
return skcipher_setkey_unaligned(tfm, key, keylen);
return cipher->setkey(tfm, key, keylen);
}
static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
@ -784,7 +822,7 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
tfm->__crt_alg->cra_type == &crypto_givcipher_type)
return crypto_init_skcipher_ops_ablkcipher(tfm);
skcipher->setkey = alg->setkey;
skcipher->setkey = skcipher_setkey;
skcipher->encrypt = alg->encrypt;
skcipher->decrypt = alg->decrypt;
skcipher->ivsize = alg->ivsize;