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crypto: algif_skcipher - Require setkey before accept(2) 

commit dd504589577d8e8e70f51f997ad487a4cb6c026f upstream.

Some cipher implementations will crash if you try to use them
without calling setkey first.  This patch adds a check so that
the accept(2) call will fail with -ENOKEY if setkey hasn't been
done on the socket yet.

Cc: stable@vger.kernel.org
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Herbert Xu 2016-10-27 17:29:34 +03:00 committed by syphyr
parent 801e41acb3
commit ae422699ea
1 changed files with 42 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
crypto/algif_skcipher.c
View File

@ -31,6 +31,11 @@ struct skcipher_sg_list {
struct scatterlist sg[0];
};
struct skcipher_tfm {
struct crypto_ablkcipher *skcipher;
bool has_key;
};
struct skcipher_ctx {
struct list_head tsgl;
struct af_alg_sgl rsgl;
@ -546,17 +551,41 @@ static struct proto_ops algif_skcipher_ops = {
static void *skcipher_bind(const char *name, u32 type, u32 mask)
{
return crypto_alloc_ablkcipher(name, type, mask);
struct skcipher_tfm *tfm;
struct crypto_ablkcipher *skcipher;
tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
if (!tfm)
return ERR_PTR(-ENOMEM);
skcipher = crypto_alloc_ablkcipher(name, type, mask);
if (IS_ERR(skcipher)) {
kfree(tfm);
return ERR_CAST(skcipher);
}
tfm->skcipher = skcipher;
return tfm;
}
static void skcipher_release(void *private)
{
crypto_free_ablkcipher(private);
struct skcipher_tfm *tfm = private;
crypto_free_ablkcipher(tfm->skcipher);
kfree(tfm);
}
static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
{
return crypto_ablkcipher_setkey(private, key, keylen);
struct skcipher_tfm *tfm = private;
int err;
err = crypto_ablkcipher_setkey(tfm->skcipher, key, keylen);
tfm->has_key = !err;
return err;
}
static void skcipher_sock_destruct(struct sock *sk)
@ -575,20 +604,24 @@ static int skcipher_accept_parent(void *private, struct sock *sk)
{
struct skcipher_ctx *ctx;
struct alg_sock *ask = alg_sk(sk);
unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(private);
struct skcipher_tfm *tfm = private;
struct crypto_ablkcipher *skcipher = tfm->skcipher;
unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(skcipher);
if (!tfm->has_key)
return -ENOKEY;
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->iv = sock_kmalloc(sk, crypto_ablkcipher_ivsize(private),
ctx->iv = sock_kmalloc(sk, crypto_ablkcipher_ivsize(skcipher),
GFP_KERNEL);
if (!ctx->iv) {
sock_kfree_s(sk, ctx, len);
return -ENOMEM;
}
memset(ctx->iv, 0, crypto_ablkcipher_ivsize(private));
memset(ctx->iv, 0, crypto_ablkcipher_ivsize(skcipher));
INIT_LIST_HEAD(&ctx->tsgl);
ctx->len = len;
@ -600,9 +633,9 @@ static int skcipher_accept_parent(void *private, struct sock *sk)
ask->private = ctx;
ablkcipher_request_set_tfm(&ctx->req, private);
ablkcipher_request_set_tfm(&ctx->req, skcipher);
ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
af_alg_complete, &ctx->completion);
af_alg_complete, &ctx->completion);
sk->sk_destruct = skcipher_sock_destruct;