From nobody Fri Oct 17 13:25:10 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29D0EC4332F for ; Wed, 19 Oct 2022 09:18:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229921AbiJSJSy (ORCPT ); Wed, 19 Oct 2022 05:18:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233218AbiJSJQ5 (ORCPT ); Wed, 19 Oct 2022 05:16:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBB795FAE7; Wed, 19 Oct 2022 02:07:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7CFDC61868; Wed, 19 Oct 2022 09:06:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8AE79C433D7; Wed, 19 Oct 2022 09:06:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666170387; bh=NI1fBXPVYlDZ4B6j6GMBIhhEi5k4CLiLesxDmWTMZN8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g/9IqxyFPdEk3n2rhwQIJvPRSNDFkXFPpkM6dwWdhaO/e60kQmwhIm//QcA+LeI20 gxOxgswR/pTyliRExviYmqZyG27qMtDHg9w/3zmv2M3yfnHXBQZeOcnYDtYM9k9ZiT G7Gizxd0v8NKxkomjWbv5qTgsmZBquhv9qy2YcG8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ignat Korchagin , Herbert Xu , Sasha Levin Subject: [PATCH 6.0 635/862] crypto: akcipher - default implementation for setting a private key Date: Wed, 19 Oct 2022 10:32:02 +0200 Message-Id: <20221019083317.996776853@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Ignat Korchagin [ Upstream commit bc155c6c188c2f0c5749993b1405673d25a80389 ] Changes from v1: * removed the default implementation from set_pub_key: it is assumed that an implementation must always have this callback defined as there are no use case for an algorithm, which doesn't need a public key Many akcipher implementations (like ECDSA) support only signature verifications, so they don't have all callbacks defined. Commit 78a0324f4a53 ("crypto: akcipher - default implementations for request callbacks") introduced default callbacks for sign/verify operations, which just return an error code. However, these are not enough, because before calling sign the caller would likely call set_priv_key first on the instantiated transform (as the in-kernel testmgr does). This function does not have a default stub, so the kernel crashes, when trying to set a private key on an akcipher, which doesn't support signature generation. I've noticed this, when trying to add a KAT vector for ECDSA signature to the testmgr. With this patch the testmgr returns an error in dmesg (as it should) instead of crashing the kernel NULL ptr dereference. Fixes: 78a0324f4a53 ("crypto: akcipher - default implementations for reques= t callbacks") Signed-off-by: Ignat Korchagin Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- crypto/akcipher.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/crypto/akcipher.c b/crypto/akcipher.c index f866085c8a4a..ab975a420e1e 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -120,6 +120,12 @@ static int akcipher_default_op(struct akcipher_request= *req) return -ENOSYS; } =20 +static int akcipher_default_set_key(struct crypto_akcipher *tfm, + const void *key, unsigned int keylen) +{ + return -ENOSYS; +} + int crypto_register_akcipher(struct akcipher_alg *alg) { struct crypto_alg *base =3D &alg->base; @@ -132,6 +138,8 @@ int crypto_register_akcipher(struct akcipher_alg *alg) alg->encrypt =3D akcipher_default_op; if (!alg->decrypt) alg->decrypt =3D akcipher_default_op; + if (!alg->set_priv_key) + alg->set_priv_key =3D akcipher_default_set_key; =20 akcipher_prepare_alg(alg); return crypto_register_alg(base); --=20 2.35.1