Commit 06deeec7 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Steve French

cifs: Fix smbencrypt() to stop pointing a scatterlist at the stack

smbencrypt() points a scatterlist to the stack, which is breaks if
CONFIG_VMAP_STACK=y.

Fix it by switching to crypto_cipher_encrypt_one().  The new code
should be considerably faster as an added benefit.

This code is nearly identical to some code that Eric Biggers
suggested.

Cc: stable@vger.kernel.org # 4.9 only
Reported-by: default avatarEric Biggers <ebiggers3@gmail.com>
Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Acked-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent 96a988ff
...@@ -23,7 +23,7 @@ ...@@ -23,7 +23,7 @@
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/ */
#include <crypto/skcipher.h> #include <linux/crypto.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/fs.h> #include <linux/fs.h>
...@@ -69,46 +69,22 @@ str_to_key(unsigned char *str, unsigned char *key) ...@@ -69,46 +69,22 @@ str_to_key(unsigned char *str, unsigned char *key)
static int static int
smbhash(unsigned char *out, const unsigned char *in, unsigned char *key) smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
{ {
int rc;
unsigned char key2[8]; unsigned char key2[8];
struct crypto_skcipher *tfm_des; struct crypto_cipher *tfm_des;
struct scatterlist sgin, sgout;
struct skcipher_request *req;
str_to_key(key, key2); str_to_key(key, key2);
tfm_des = crypto_alloc_skcipher("ecb(des)", 0, CRYPTO_ALG_ASYNC); tfm_des = crypto_alloc_cipher("des", 0, 0);
if (IS_ERR(tfm_des)) { if (IS_ERR(tfm_des)) {
rc = PTR_ERR(tfm_des);
cifs_dbg(VFS, "could not allocate des crypto API\n");
goto smbhash_err;
}
req = skcipher_request_alloc(tfm_des, GFP_KERNEL);
if (!req) {
rc = -ENOMEM;
cifs_dbg(VFS, "could not allocate des crypto API\n"); cifs_dbg(VFS, "could not allocate des crypto API\n");
goto smbhash_free_skcipher; return PTR_ERR(tfm_des);
} }
crypto_skcipher_setkey(tfm_des, key2, 8); crypto_cipher_setkey(tfm_des, key2, 8);
crypto_cipher_encrypt_one(tfm_des, out, in);
sg_init_one(&sgin, in, 8); crypto_free_cipher(tfm_des);
sg_init_one(&sgout, out, 8);
skcipher_request_set_callback(req, 0, NULL, NULL); return 0;
skcipher_request_set_crypt(req, &sgin, &sgout, 8, NULL);
rc = crypto_skcipher_encrypt(req);
if (rc)
cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc);
skcipher_request_free(req);
smbhash_free_skcipher:
crypto_free_skcipher(tfm_des);
smbhash_err:
return rc;
} }
static int static int
......
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