On Mon, 2016-12-12 at 12:54 -0800, Andy Lutomirski wrote: > 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@xxxxxxxxxxxxxxx # 4.9 only > Reported-by: Eric Biggers <ebiggers3@xxxxxxxxx> > Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx> > --- > > Compile-tested only. > > fs/cifs/smbencrypt.c | 40 ++++++++-------------------------------- > 1 file changed, 8 insertions(+), 32 deletions(-) > > diff --git a/fs/cifs/smbencrypt.c b/fs/cifs/smbencrypt.c > index 699b7868108f..c12bffefa3c9 100644 > --- a/fs/cifs/smbencrypt.c > +++ b/fs/cifs/smbencrypt.c > @@ -23,7 +23,7 @@ > Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. > */ > > -#include <crypto/skcipher.h> > +#include <linux/crypto.h> > #include <linux/module.h> > #include <linux/slab.h> > #include <linux/fs.h> > @@ -69,46 +69,22 @@ str_to_key(unsigned char *str, unsigned char *key) > static int > smbhash(unsigned char *out, const unsigned char *in, unsigned char *key) > { > - int rc; > unsigned char key2[8]; > - struct crypto_skcipher *tfm_des; > - struct scatterlist sgin, sgout; > - struct skcipher_request *req; > + struct crypto_cipher *tfm_des; > > 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)) { > - 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"); > - goto smbhash_free_skcipher; > + return PTR_ERR(tfm_des); > } > > - crypto_skcipher_setkey(tfm_des, key2, 8); > - > - sg_init_one(&sgin, in, 8); > - sg_init_one(&sgout, out, 8); > + crypto_cipher_setkey(tfm_des, key2, 8); > + crypto_cipher_encrypt_one(tfm_des, out, in); > + crypto_free_cipher(tfm_des); > > - skcipher_request_set_callback(req, 0, NULL, NULL); > - 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; > + return 0; > } > > static int Acked-by: Jeff Layton <jlayton@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html