From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752661AbdBETTd (ORCPT + 2 others); Sun, 5 Feb 2017 14:19:33 -0500 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:27254 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751931AbdBETPe (ORCPT ); Sun, 5 Feb 2017 14:15:34 -0500 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, linux@roeck-us.net Cc: Herbert Xu , Andrey Ryabinin , Willy Tarreau Subject: [PATCH 3.10 003/319] crypto: algif_skcipher - Require setkey before accept(2) Date: Sun, 5 Feb 2017 20:09:07 +0100 Message-Id: <1486322063-7558-4-git-send-email-w@1wt.eu> X-Mailer: git-send-email 2.8.0.rc2.1.gbe9624a In-Reply-To: <1486322063-7558-1-git-send-email-w@1wt.eu> References: <1486322063-7558-1-git-send-email-w@1wt.eu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: From: Herbert Xu 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 Signed-off-by: Herbert Xu Tested-by: Dmitry Vyukov Signed-off-by: Andrey Ryabinin Signed-off-by: Willy Tarreau --- crypto/algif_skcipher.c | 51 ++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 42 insertions(+), 9 deletions(-) diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index 83187f4..c4c121a 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -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; -- 2.8.0.rc2.1.gbe9624a