staging: rtl8192e: ieee80211: Convert from ahash to shash

This is an identical change to the wireless/lib80211 of the same name.
In preparing to remove all stack VLA usage from the kernel[1], this
removes the discouraged use of AHASH_REQUEST_ON_STACK in favor of
the smaller SHASH_DESC_ON_STACK by converting from ahash-wrapped-shash
to direct shash. By removing a layer of indirection this both improves
performance and reduces stack usage. The stack allocation will be made
a fixed size in a later patch to the crypto subsystem.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8192e/rtllib_crypt_tkip.c b/drivers/staging/rtl8192e/rtllib_crypt_tkip.c
index ae103b0b7a2a592a1759d86e764b957d8e9b654e..9f18be14dda69eb3fedb334ee14ffad29de7c594 100644 (file)
--- a/drivers/staging/rtl8192e/rtllib_crypt_tkip.c
+++ b/drivers/staging/rtl8192e/rtllib_crypt_tkip.c
@@ -50,9 +50,9 @@ struct rtllib_tkip_data {
 
        int key_idx;
        struct crypto_skcipher *rx_tfm_arc4;
-       struct crypto_ahash *rx_tfm_michael;
+       struct crypto_shash *rx_tfm_michael;
        struct crypto_skcipher *tx_tfm_arc4;
-       struct crypto_ahash *tx_tfm_michael;
+       struct crypto_shash *tx_tfm_michael;
        /* scratch buffers for virt_to_page() (crypto API) */
        u8 rx_hdr[16];
        u8 tx_hdr[16];
@@ -74,8 +74,7 @@ static void *rtllib_tkip_init(int key_idx)
                goto fail;
        }
 
-       priv->tx_tfm_michael = crypto_alloc_ahash("michael_mic", 0,
-                                                 CRYPTO_ALG_ASYNC);
+       priv->tx_tfm_michael = crypto_alloc_shash("michael_mic", 0, 0);
        if (IS_ERR(priv->tx_tfm_michael)) {
                pr_debug("Could not allocate crypto API michael_mic\n");
                priv->tx_tfm_michael = NULL;
@@ -90,8 +89,7 @@ static void *rtllib_tkip_init(int key_idx)
                goto fail;
        }
 
-       priv->rx_tfm_michael = crypto_alloc_ahash("michael_mic", 0,
-                                                 CRYPTO_ALG_ASYNC);
+       priv->rx_tfm_michael = crypto_alloc_shash("michael_mic", 0, 0);
        if (IS_ERR(priv->rx_tfm_michael)) {
                pr_debug("Could not allocate crypto API michael_mic\n");
                priv->rx_tfm_michael = NULL;
@@ -101,9 +99,9 @@ static void *rtllib_tkip_init(int key_idx)
 
 fail:
        if (priv) {
-               crypto_free_ahash(priv->tx_tfm_michael);
+               crypto_free_shash(priv->tx_tfm_michael);
                crypto_free_skcipher(priv->tx_tfm_arc4);
-               crypto_free_ahash(priv->rx_tfm_michael);
+               crypto_free_shash(priv->rx_tfm_michael);
                crypto_free_skcipher(priv->rx_tfm_arc4);
                kfree(priv);
        }
@@ -117,9 +115,9 @@ static void rtllib_tkip_deinit(void *priv)
        struct rtllib_tkip_data *_priv = priv;
 
        if (_priv) {
-               crypto_free_ahash(_priv->tx_tfm_michael);
+               crypto_free_shash(_priv->tx_tfm_michael);
                crypto_free_skcipher(_priv->tx_tfm_arc4);
-               crypto_free_ahash(_priv->rx_tfm_michael);
+               crypto_free_shash(_priv->rx_tfm_michael);
                crypto_free_skcipher(_priv->rx_tfm_arc4);
        }
        kfree(priv);
@@ -504,29 +502,31 @@ static int rtllib_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
 }
 
 
-static int michael_mic(struct crypto_ahash *tfm_michael, u8 *key, u8 *hdr,
+static int michael_mic(struct crypto_shash *tfm_michael, u8 *key, u8 *hdr,
                       u8 *data, size_t data_len, u8 *mic)
 {
-       AHASH_REQUEST_ON_STACK(req, tfm_michael);
-       struct scatterlist sg[2];
+       SHASH_DESC_ON_STACK(desc, tfm_michael);
        int err;
 
-       if (tfm_michael == NULL) {
-               pr_warn("michael_mic: tfm_michael == NULL\n");
-               return -1;
-       }
-       sg_init_table(sg, 2);
-       sg_set_buf(&sg[0], hdr, 16);
-       sg_set_buf(&sg[1], data, data_len);
+       desc->tfm = tfm_michael;
+       desc->flags = 0;
 
-       if (crypto_ahash_setkey(tfm_michael, key, 8))
+       if (crypto_shash_setkey(tfm_michael, key, 8))
                return -1;
 
-       ahash_request_set_tfm(req, tfm_michael);
-       ahash_request_set_callback(req, 0, NULL, NULL);
-       ahash_request_set_crypt(req, sg, mic, data_len + 16);
-       err = crypto_ahash_digest(req);
-       ahash_request_zero(req);
+       err = crypto_shash_init(desc);
+       if (err)
+               goto out;
+       err = crypto_shash_update(desc, hdr, 16);
+       if (err)
+               goto out;
+       err = crypto_shash_update(desc, data, data_len);
+       if (err)
+               goto out;
+       err = crypto_shash_final(desc, mic);
+
+out:
+       shash_desc_zero(desc);
        return err;
 }
 
@@ -663,9 +663,9 @@ static int rtllib_tkip_set_key(void *key, int len, u8 *seq, void *priv)
 {
        struct rtllib_tkip_data *tkey = priv;
        int keyidx;
-       struct crypto_ahash *tfm = tkey->tx_tfm_michael;
+       struct crypto_shash *tfm = tkey->tx_tfm_michael;
        struct crypto_skcipher *tfm2 = tkey->tx_tfm_arc4;
-       struct crypto_ahash *tfm3 = tkey->rx_tfm_michael;
+       struct crypto_shash *tfm3 = tkey->rx_tfm_michael;
        struct crypto_skcipher *tfm4 = tkey->rx_tfm_arc4;
 
        keyidx = tkey->key_idx;