[CRYPTO] api: Handle unaligned keys in setkey

setkey() in {cipher,blkcipher,ablkcipher,hash}.c does not respect the
requested alignment by the algorithm. This patch fixes it. The extra
memory is allocated by kmalloc() with GFP_ATOMIC flag.

Signed-off-by: Sebastian Siewior <linux-crypto@ml.breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 9348ddd..d45fa16 100644 (file)
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -19,16 +19,41 @@
 #include <linux/module.h>
 #include <linux/seq_file.h>
 
+static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen)
+{
+       struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
+       unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
+       int ret;
+       u8 *buffer, *alignbuffer;
+       unsigned long absize;
+
+       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);
+       memset(alignbuffer, 0, absize);
+       kfree(buffer);
+       return ret;
+}
+
 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
                  unsigned int keylen)
 {
        struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
+       unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
 
        if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
                crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
                return -EINVAL;
        }
 
+       if ((unsigned long)key & alignmask)
+               return setkey_unaligned(tfm, key, keylen);
+
        return cipher->setkey(tfm, key, keylen);
 }
 

diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 8edf40c..40a3dcf 100644 (file)
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -336,16 +336,41 @@ static int blkcipher_walk_first(struct blkcipher_desc *desc,
        return blkcipher_walk_next(desc, walk);
 }
 
+static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
+{
+       struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
+       unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
+       int ret;
+       u8 *buffer, *alignbuffer;
+       unsigned long absize;
+
+       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);
+       memset(alignbuffer, 0, absize);
+       kfree(buffer);
+       return ret;
+}
+
 static int setkey(struct crypto_tfm *tfm, const u8 *key,
                  unsigned int keylen)
 {
        struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
+       unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
 
        if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
                tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
                return -EINVAL;
        }
 
+       if ((unsigned long)key & alignmask)
+               return setkey_unaligned(tfm, key, keylen);
+
        return cipher->setkey(tfm, key, keylen);
 }
 

diff --git a/crypto/cipher.c b/crypto/cipher.c
index 333aab2..0b2650c 100644 (file)
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -20,16 +20,43 @@
 #include <linux/string.h>
 #include "internal.h"
 
+static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
+{
+       struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
+       unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
+       int ret;
+       u8 *buffer, *alignbuffer;
+       unsigned long absize;
+
+       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 = cia->cia_setkey(tfm, alignbuffer, keylen);
+       memset(alignbuffer, 0, absize);
+       kfree(buffer);
+       return ret;
+
+}
+
 static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 {
        struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
-       
+       unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
+
        tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
        if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
                tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
                return -EINVAL;
-       } else
-               return cia->cia_setkey(tfm, key, keylen);
+       }
+
+       if ((unsigned long)key & alignmask)
+               return setkey_unaligned(tfm, key, keylen);
+
+       return cia->cia_setkey(tfm, key, keylen);
 }
 
 static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,

diff --git a/crypto/hash.c b/crypto/hash.c
index 4ccd22d..4d75ca7 100644 (file)
--- a/crypto/hash.c
+++ b/crypto/hash.c
@@ -22,6 +22,42 @@ static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
        return alg->cra_ctxsize;
 }
 
+static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
+                                unsigned int keylen)
+{
+       struct crypto_tfm *tfm = crypto_hash_tfm(crt);
+       struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
+       unsigned long alignmask = crypto_hash_alignmask(crt);
+       int ret;
+       u8 *buffer, *alignbuffer;
+       unsigned long absize;
+
+       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 = alg->setkey(crt, alignbuffer, keylen);
+       memset(alignbuffer, 0, absize);
+       kfree(buffer);
+       return ret;
+}
+
+static int hash_setkey(struct crypto_hash *crt, const u8 *key,
+               unsigned int keylen)
+{
+       struct crypto_tfm *tfm = crypto_hash_tfm(crt);
+       struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
+       unsigned long alignmask = crypto_hash_alignmask(crt);
+
+       if ((unsigned long)key & alignmask)
+               return hash_setkey_unaligned(crt, key, keylen);
+
+       return alg->setkey(crt, key, keylen);
+}
+
 static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
 {
        struct hash_tfm *crt = &tfm->crt_hash;
@@ -34,7 +70,7 @@ static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
        crt->update = alg->update;
        crt->final = alg->final;
        crt->digest = alg->digest;
-       crt->setkey = alg->setkey;
+       crt->setkey = hash_setkey;
        crt->digestsize = alg->digestsize;
 
        return 0;