From patchwork Mon Apr 13 21:15:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Waiman Long X-Patchwork-Id: 11486321 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B2289112C for ; Mon, 13 Apr 2020 21:17:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9316820732 for ; Mon, 13 Apr 2020 21:17:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OpnyKRsk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388878AbgDMVRh (ORCPT ); Mon, 13 Apr 2020 17:17:37 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:46237 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2388877AbgDMVQy (ORCPT ); Mon, 13 Apr 2020 17:16:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1586812612; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=nDsD8ARELWs0d4asbSq1NjjS9iTGbr+u27Se40H771Q=; b=OpnyKRskBXJLEtUdxfF7H+AiMVw8WCqUQvEOO3WeWg+m7J418wYlKLE5V0k52i7+pe5V5F FTk5BDx6xu7qKuWD9pxqWuWlpi//BmiKLquj+OaCjSy47bXvkpodae+W08Ro85gidyzd6e 9JA7ZyPIldBK2RmKWjW4P+HprG8GQDs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-346-rjIc-N9CM66LO5fX_MJoTg-1; Mon, 13 Apr 2020 17:16:49 -0400 X-MC-Unique: rjIc-N9CM66LO5fX_MJoTg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 64AE4107ACCA; Mon, 13 Apr 2020 21:16:44 +0000 (UTC) Received: from llong.com (ovpn-115-28.rdu2.redhat.com [10.10.115.28]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1198311D2D3; Mon, 13 Apr 2020 21:16:39 +0000 (UTC) From: Waiman Long To: Andrew Morton , David Howells , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" , Linus Torvalds , Joe Perches , Matthew Wilcox , David Rientjes Cc: linux-mm@kvack.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-crypto@vger.kernel.org, linux-s390@vger.kernel.org, linux-pm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-ppp@vger.kernel.org, wireguard@lists.zx2c4.com, linux-wireless@vger.kernel.org, devel@driverdev.osuosl.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-fscrypt@vger.kernel.org, ecryptfs@vger.kernel.org, kasan-dev@googlegroups.com, linux-bluetooth@vger.kernel.org, linux-wpan@vger.kernel.org, linux-sctp@vger.kernel.org, linux-nfs@vger.kernel.org, tipc-discussion@lists.sourceforge.net, cocci@systeme.lip6.fr, linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, Waiman Long Subject: [PATCH 2/2] crypto: Remove unnecessary memzero_explicit() Date: Mon, 13 Apr 2020 17:15:50 -0400 Message-Id: <20200413211550.8307-3-longman@redhat.com> In-Reply-To: <20200413211550.8307-1-longman@redhat.com> References: <20200413211550.8307-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Since kfree_sensitive() will do an implicit memzero_explicit(), there is no need to call memzero_explicit() before it. Eliminate those memzero_explicit() and simplify the call sites. Signed-off-by: Waiman Long --- .../crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c | 15 +++------------ .../crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c | 16 +++------------- drivers/crypto/amlogic/amlogic-gxl-cipher.c | 10 ++-------- drivers/crypto/inside-secure/safexcel_hash.c | 3 +-- 4 files changed, 9 insertions(+), 35 deletions(-) diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c index aa4e8fdc2b32..46c10c7ca6d0 100644 --- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c +++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c @@ -366,10 +366,7 @@ void sun8i_ce_cipher_exit(struct crypto_tfm *tfm) { struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key); crypto_free_sync_skcipher(op->fallback_tfm); pm_runtime_put_sync_suspend(op->ce->dev); } @@ -391,10 +388,7 @@ int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen); return -EINVAL; } - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key); op->keylen = keylen; op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); if (!op->key) @@ -416,10 +410,7 @@ int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, if (err) return err; - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + free_sensitive(op->key, op->keylen); op->keylen = keylen; op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); if (!op->key) diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c index 5246ef4f5430..7e09a923cbaf 100644 --- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c @@ -249,7 +249,6 @@ static int sun8i_ss_cipher(struct skcipher_request *areq) offset = areq->cryptlen - ivsize; if (rctx->op_dir & SS_DECRYPTION) { memcpy(areq->iv, backup_iv, ivsize); - memzero_explicit(backup_iv, ivsize); kfree_sensitive(backup_iv); } else { scatterwalk_map_and_copy(areq->iv, areq->dst, offset, @@ -367,10 +366,7 @@ void sun8i_ss_cipher_exit(struct crypto_tfm *tfm) { struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key); crypto_free_sync_skcipher(op->fallback_tfm); pm_runtime_put_sync(op->ss->dev); } @@ -392,10 +388,7 @@ int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen); return -EINVAL; } - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key); op->keylen = keylen; op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); if (!op->key) @@ -418,10 +411,7 @@ int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, return -EINVAL; } - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key); op->keylen = keylen; op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); if (!op->key) diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c index fd1269900d67..f424397fbba4 100644 --- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c +++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c @@ -341,10 +341,7 @@ void meson_cipher_exit(struct crypto_tfm *tfm) { struct meson_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key) crypto_free_sync_skcipher(op->fallback_tfm); } @@ -368,10 +365,7 @@ int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, dev_dbg(mc->dev, "ERROR: Invalid keylen %u\n", keylen); return -EINVAL; } - if (op->key) { - memzero_explicit(op->key, op->keylen); - kfree(op->key); - } + kfree_sensitive(op->key); op->keylen = keylen; op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); if (!op->key) diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c index 43962bc709c6..4a2d162914de 100644 --- a/drivers/crypto/inside-secure/safexcel_hash.c +++ b/drivers/crypto/inside-secure/safexcel_hash.c @@ -1081,8 +1081,7 @@ static int safexcel_hmac_init_pad(struct ahash_request *areq, } /* Avoid leaking */ - memzero_explicit(keydup, keylen); - kfree(keydup); + kfree_sensitive(keydup); if (ret) return ret;