crypto: skcipher - Copy iv from desc even for 0-len walks

commit 70d906bc17500edfa9bdd8c8b7e59618c7911613 upstream.

Some ciphers actually support encrypting zero length plaintexts. For
example, many AEAD modes support this. The resulting ciphertext for
those winds up being only the authentication tag, which is a result of
the key, the iv, the additional data, and the fact that the plaintext
had zero length. The blkcipher constructors won't copy the IV to the
right place, however, when using a zero length input, resulting in
some significant problems when ciphers call their initialization
routines, only to find that the ->iv parameter is uninitialized. One
such example of this would be using chacha20poly1305 with a zero length
input, which then calls chacha20, which calls the key setup routine,
which eventually OOPSes due to the uninitialized ->iv member.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index d53a30b7f703b4b873ee91e27a6acc9ebd587d6c..6eb6eb122502bacf5ad5764dd52e6bc3f7e248f5 100644 (file)
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -280,12 +280,12 @@ static int ablkcipher_walk_first(struct ablkcipher_request *req,
        if (WARN_ON_ONCE(in_irq()))
                return -EDEADLK;
 
+       walk->iv = req->info;
        walk->nbytes = walk->total;
        if (unlikely(!walk->total))
                return 0;
 
        walk->iv_buffer = NULL;
-       walk->iv = req->info;
        if (unlikely(((unsigned long)walk->iv & alignmask))) {
                int err = ablkcipher_copy_iv(walk, tfm, alignmask);
                if (err)

diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 04f0f388adf1bd1f274f61d89c48e5dfc30664cf..3041504370b1b964d4e2d550b7a9b15fffa7fa15 100644 (file)
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -329,12 +329,12 @@ static int blkcipher_walk_first(struct blkcipher_desc *desc,
        if (WARN_ON_ONCE(in_irq()))
                return -EDEADLK;
 
+       walk->iv = desc->info;
        walk->nbytes = walk->total;
        if (unlikely(!walk->total))
                return 0;
 
        walk->buffer = NULL;
-       walk->iv = desc->info;
        if (unlikely(((unsigned long)walk->iv & alignmask))) {
                int err = blkcipher_copy_iv(walk, tfm, alignmask);
                if (err)