From nobody Fri Dec 19 18:41:48 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 ECD8CC38A2D for ; Mon, 24 Oct 2022 20:23:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231382AbiJXUXx (ORCPT ); Mon, 24 Oct 2022 16:23:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234243AbiJXUXB (ORCPT ); Mon, 24 Oct 2022 16:23:01 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8AE8AC4AE; Mon, 24 Oct 2022 11:38:22 -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 ams.source.kernel.org (Postfix) with ESMTPS id 67A07B815E6; Mon, 24 Oct 2022 12:12:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C39E1C433C1; Mon, 24 Oct 2022 12:12:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666613550; bh=2HjTKxmeeRJf9SO8vt0eJKqSwURDpwCV1KyIQ4MKMTQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n/H54K16RPKpyppJljoHY38ghbRPd4YMIL7z+722W+JEkn2kYVuefDro9/V5DL359 bEEvIqinJkU6D8VAsKf5qzfShfDnnSpx/HtMV+FdTjIzVJn2i6UuoVihQDBCRSrNS4 2sIHG/goL/2DY3O/ZNrxxlwxTlGoNibruHLLpi6o= 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 5.4 179/255] crypto: akcipher - default implementation for setting a private key Date: Mon, 24 Oct 2022 13:31:29 +0200 Message-Id: <20221024113008.816417193@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113002.471093005@linuxfoundation.org> References: <20221024113002.471093005@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 7d5cf4939423..ceb0c2fb2b24 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -119,6 +119,12 @@ 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; @@ -131,6 +137,8 @@ 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