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orinoco: Use shash instead of ahash for MIC calculations 

Eric Biggers pointed out that the orinoco driver pointed scatterlists
at the stack.

Fix it by switching from ahash to shash.  The result should be
simpler, faster, and more correct.

Cc: stable@vger.kernel.org # 4.9 only
Reported-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Andrew Lutomirski 2016-12-12 12:55:55 -08:00 committed by Kalle Valo
parent c705a6b3aa
commit 1fef293b8a
3 changed files with 30 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/net/wireless/intersil/orinoco/mic.c
View File

@ -16,7 +16,7 @@
/********************************************************************/
int orinoco_mic_init(struct orinoco_private *priv)
{
priv->tx_tfm_mic = crypto_alloc_ahash("michael_mic", 0,
priv->tx_tfm_mic = crypto_alloc_shash("michael_mic", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(priv->tx_tfm_mic)) {
printk(KERN_DEBUG "orinoco_mic_init: could not allocate "
@ -25,7 +25,7 @@ int orinoco_mic_init(struct orinoco_private *priv)
return -ENOMEM;
}
priv->rx_tfm_mic = crypto_alloc_ahash("michael_mic", 0,
priv->rx_tfm_mic = crypto_alloc_shash("michael_mic", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(priv->rx_tfm_mic)) {
printk(KERN_DEBUG "orinoco_mic_init: could not allocate "
@ -40,17 +40,16 @@ int orinoco_mic_init(struct orinoco_private *priv)
void orinoco_mic_free(struct orinoco_private *priv)
{
if (priv->tx_tfm_mic)
crypto_free_ahash(priv->tx_tfm_mic);
crypto_free_shash(priv->tx_tfm_mic);
if (priv->rx_tfm_mic)
crypto_free_ahash(priv->rx_tfm_mic);
crypto_free_shash(priv->rx_tfm_mic);
}
int orinoco_mic(struct crypto_ahash *tfm_michael, u8 *key,
int orinoco_mic(struct crypto_shash *tfm_michael, u8 *key,
u8 *da, u8 *sa, u8 priority,
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);
u8 hdr[ETH_HLEN + 2]; /* size of header + padding */
int err;
@ -67,18 +66,27 @@ int orinoco_mic(struct crypto_ahash *tfm_michael, u8 *key,
hdr[ETH_ALEN * 2 + 2] = 0;
hdr[ETH_ALEN * 2 + 3] = 0;
/* Use scatter gather to MIC header and data in one go */
sg_init_table(sg, 2);
sg_set_buf(&sg[0], hdr, sizeof(hdr));
sg_set_buf(&sg[1], data, data_len);
desc->tfm = tfm_michael;
desc->flags = 0;
if (crypto_ahash_setkey(tfm_michael, key, MIC_KEYLEN))
return -1;
err = crypto_shash_setkey(tfm_michael, key, MIC_KEYLEN);
if (err)
return err;
err = crypto_shash_init(desc);
if (err)
return err;
err = crypto_shash_update(desc, hdr, sizeof(hdr));
if (err)
return err;
err = crypto_shash_update(desc, data, data_len);
if (err)
return err;
err = crypto_shash_final(desc, mic);
shash_desc_zero(desc);
ahash_request_set_tfm(req, tfm_michael);
ahash_request_set_callback(req, 0, NULL, NULL);
ahash_request_set_crypt(req, sg, mic, data_len + sizeof(hdr));
err = crypto_ahash_digest(req);
ahash_request_zero(req);
return err;
}

3
drivers/net/wireless/intersil/orinoco/mic.h
View File

@ -6,6 +6,7 @@
#define _ORINOCO_MIC_H_
#include <linux/types.h>
#include <crypto/hash.h>
#define MICHAEL_MIC_LEN 8
@ -15,7 +16,7 @@ struct crypto_ahash;
int orinoco_mic_init(struct orinoco_private *priv);
void orinoco_mic_free(struct orinoco_private *priv);
int orinoco_mic(struct crypto_ahash *tfm_michael, u8 *key,
int orinoco_mic(struct crypto_shash *tfm_michael, u8 *key,
u8 *da, u8 *sa, u8 priority,
u8 *data, size_t data_len, u8 *mic);

4
drivers/net/wireless/intersil/orinoco/orinoco.h
View File

@ -152,8 +152,8 @@ struct orinoco_private {
u8 *wpa_ie;
int wpa_ie_len;
struct crypto_ahash *rx_tfm_mic;
struct crypto_ahash *tx_tfm_mic;
struct crypto_shash *rx_tfm_mic;
struct crypto_shash *tx_tfm_mic;
unsigned int wpa_enabled:1;
unsigned int tkip_cm_active:1;