From patchwork Thu Apr 11 15:51:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Chikunov X-Patchwork-Id: 10896329 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 39E3B17E6 for ; Thu, 11 Apr 2019 15:52:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2343A28C6A for ; Thu, 11 Apr 2019 15:52:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1750F28C59; Thu, 11 Apr 2019 15:52:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9C98D28C95 for ; Thu, 11 Apr 2019 15:52:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726867AbfDKPv5 (ORCPT ); Thu, 11 Apr 2019 11:51:57 -0400 Received: from vmicros1.altlinux.org ([194.107.17.57]:44548 "EHLO vmicros1.altlinux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726895AbfDKPv4 (ORCPT ); Thu, 11 Apr 2019 11:51:56 -0400 Received: from imap.altlinux.org (imap.altlinux.org [194.107.17.38]) by vmicros1.altlinux.org (Postfix) with ESMTP id 72C0C72CC58; Thu, 11 Apr 2019 18:51:53 +0300 (MSK) Received: from beacon.altlinux.org (unknown [185.6.174.98]) by imap.altlinux.org (Postfix) with ESMTPSA id 238144A4A2A; Thu, 11 Apr 2019 18:51:53 +0300 (MSK) From: Vitaly Chikunov To: Herbert Xu , David Howells , Mimi Zohar , Dmitry Kasatkin , linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Denis Kenzior Subject: [PATCH v9 04/10] KEYS: do not kmemdup digest in {public,tpm}_key_verify_signature Date: Thu, 11 Apr 2019 18:51:16 +0300 Message-Id: <20190411155122.13245-5-vt@altlinux.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190411155122.13245-1-vt@altlinux.org> References: <20190411155122.13245-1-vt@altlinux.org> MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Treat (struct public_key_signature)'s digest same as its signature (s). Since digest should be already in the kmalloc'd memory do not kmemdup digest value before calling {public,tpm}_key_verify_signature. Patch is split from the previous as suggested by Herbert Xu. Suggested-by: David Howells Cc: David Howells Cc: keyrings@vger.kernel.org Signed-off-by: Vitaly Chikunov Reviewed-by: Denis Kenzior --- crypto/asymmetric_keys/asym_tpm.c | 10 +--------- crypto/asymmetric_keys/public_key.c | 9 +-------- 2 files changed, 2 insertions(+), 17 deletions(-) diff --git a/crypto/asymmetric_keys/asym_tpm.c b/crypto/asymmetric_keys/asym_tpm.c index 4e5b6fb57a94..402fc34ca044 100644 --- a/crypto/asymmetric_keys/asym_tpm.c +++ b/crypto/asymmetric_keys/asym_tpm.c @@ -748,7 +748,6 @@ static int tpm_key_verify_signature(const struct key *key, char alg_name[CRYPTO_MAX_ALG_NAME]; uint8_t der_pub_key[PUB_KEY_BUF_SIZE]; uint32_t der_pub_key_len; - void *digest; int ret; pr_devel("==>%s()\n", __func__); @@ -780,14 +779,9 @@ static int tpm_key_verify_signature(const struct key *key, if (!req) goto error_free_tfm; - ret = -ENOMEM; - digest = kmemdup(sig->digest, sig->digest_size, GFP_KERNEL); - if (!digest) - goto error_free_req; - sg_init_table(src_sg, 2); sg_set_buf(&src_sg[0], sig->s, sig->s_size); - sg_set_buf(&src_sg[1], digest, sig->digest_size); + sg_set_buf(&src_sg[1], sig->digest, sig->digest_size); akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size, sig->digest_size); crypto_init_wait(&cwait); @@ -796,8 +790,6 @@ static int tpm_key_verify_signature(const struct key *key, crypto_req_done, &cwait); ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait); - kfree(digest); -error_free_req: akcipher_request_free(req); error_free_tfm: crypto_free_akcipher(tfm); diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 0c069fe8a59c..33093b7bcc47 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -229,7 +229,6 @@ int public_key_verify_signature(const struct public_key *pkey, struct akcipher_request *req; struct scatterlist src_sg[2]; char alg_name[CRYPTO_MAX_ALG_NAME]; - void *digest; int ret; pr_devel("==>%s()\n", __func__); @@ -262,14 +261,9 @@ int public_key_verify_signature(const struct public_key *pkey, if (ret) goto error_free_req; - ret = -ENOMEM; - digest = kmemdup(sig->digest, sig->digest_size, GFP_KERNEL); - if (!digest) - goto error_free_req; - sg_init_table(src_sg, 2); sg_set_buf(&src_sg[0], sig->s, sig->s_size); - sg_set_buf(&src_sg[1], digest, sig->digest_size); + sg_set_buf(&src_sg[1], sig->digest, sig->digest_size); akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size, sig->digest_size); crypto_init_wait(&cwait); @@ -278,7 +272,6 @@ int public_key_verify_signature(const struct public_key *pkey, crypto_req_done, &cwait); ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait); - kfree(digest); error_free_req: akcipher_request_free(req); error_free_tfm: