From patchwork Thu May 30 17:50:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 10969147 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 39D0814C0 for ; Thu, 30 May 2019 17:51:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 28A9728C00 for ; Thu, 30 May 2019 17:51:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1C78028C0A; Thu, 30 May 2019 17:51:56 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B197628C0C for ; Thu, 30 May 2019 17:51:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=CNSxoFvnqNOKLw5IF2bRVNsbx0OBmDMrD3iLmG0w6/0=; b=Ut1/1rp209fwMB BGNwLQoUhOy0VzSHRlu9bynYddVY64Hme75tVBdecGOwpejga50uQ/qqonHcT3zY9UNHPxqnWJkCc +cCFO73krVE6DPfSoeSSgYyEFxj1vKbrqvaZEmJMf63dXY+kDQQUFaKrXemNEwe1w4IGhfvH0kdPX P5qiWS+vtPES3xiX9Ib4CoHYfZK1PK15mpoa3UdxsDUDCbWh0JB6PDhA8Z4hyKk05QDdHyeZ0IW/m Y+xI4v4HT4nNquQDAZ6pcvD5eo3z+F7JrIWxliKzK4tpbnuufutuh1uEgZE8xkY4nKNPN8oefkcuK ItWkVJ8LzibR3g7ToZcg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWPDQ-0000dL-32; Thu, 30 May 2019 17:51:48 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWPDN-0000d1-N0 for linux-arm-kernel@lists.infradead.org; Thu, 30 May 2019 17:51:46 +0000 Received: from ebiggers-linuxstation.mtv.corp.google.com (unknown [104.132.1.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 298D925EBD; Thu, 30 May 2019 17:51:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559238705; bh=i3XOSxLt0gd25Lvgu66PwiGPL7WdnuFqSIPbfSPRNvs=; h=From:To:Cc:Subject:Date:From; b=rdLpfIoVgc/waPa/9jjiNG++x8Ie13iqFnrqFxGMBVvq5z5bOtk5kqjgmoUd9EqNh xaTAvep02q+Ww1Bxy9imO7Z98/KYj5jqMwhBXRwW10U8QdMwnmPyXc4nz19bRSP2XJ Xaix7O+I2Qi5LiV+n1IAEWeN19gjYBYLSopFY8Cw= From: Eric Biggers To: linux-crypto@vger.kernel.org Subject: [PATCH] crypto: ghash - fix unaligned memory access in ghash_setkey() Date: Thu, 30 May 2019 10:50:39 -0700 Message-Id: <20190530175039.195574-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.22.0.rc1.257.g3120a18244-goog MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190530_105145_765710_080A4ED4 X-CRM114-Status: GOOD ( 12.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: stable@vger.kernel.org, Peter Robinson , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Eric Biggers Changing ghash_mod_init() to be subsys_initcall made it start running before the alignment fault handler has been installed on ARM. In kernel builds where the keys in the ghash test vectors happened to be misaligned in the kernel image, this exposed the longstanding bug that ghash_setkey() is incorrectly casting the key buffer (which can have any alignment) to be128 for passing to gf128mul_init_4k_lle(). Fix this by memcpy()ing the key to a temporary buffer. Don't fix it by setting an alignmask on the algorithm instead because that would unnecessarily force alignment of the data too. Fixes: 2cdc6899a88e ("crypto: ghash - Add GHASH digest algorithm for GCM") Reported-by: Peter Robinson Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers --- crypto/ghash-generic.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/crypto/ghash-generic.c b/crypto/ghash-generic.c index e6307935413c1..c8a347798eae6 100644 --- a/crypto/ghash-generic.c +++ b/crypto/ghash-generic.c @@ -34,6 +34,7 @@ static int ghash_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { struct ghash_ctx *ctx = crypto_shash_ctx(tfm); + be128 k; if (keylen != GHASH_BLOCK_SIZE) { crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); @@ -42,7 +43,12 @@ static int ghash_setkey(struct crypto_shash *tfm, if (ctx->gf128) gf128mul_free_4k(ctx->gf128); - ctx->gf128 = gf128mul_init_4k_lle((be128 *)key); + + BUILD_BUG_ON(sizeof(k) != GHASH_BLOCK_SIZE); + memcpy(&k, key, GHASH_BLOCK_SIZE); /* avoid violating alignment rules */ + ctx->gf128 = gf128mul_init_4k_lle(&k); + memzero_explicit(&k, GHASH_BLOCK_SIZE); + if (!ctx->gf128) return -ENOMEM;