From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80866C43441 for ; Wed, 14 Nov 2018 22:42:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4936D2145D for ; Wed, 14 Nov 2018 22:42:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="O2pTCa4i" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4936D2145D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728805AbeKOI1V (ORCPT ); Thu, 15 Nov 2018 03:27:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:34392 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728719AbeKOI1V (ORCPT ); Thu, 15 Nov 2018 03:27:21 -0500 Received: from sasha-vm.mshome.net (unknown [64.114.255.114]) (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 1206922528; Wed, 14 Nov 2018 22:22:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542234138; bh=F39rnfOVUoYN9/DL7o7+gxFsFk/S3E9pAO88Ys/rau0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O2pTCa4iflaaYuNXK2q0L91N5KYieVa1/YaY5XwueMByuQRFHNvDgj4PeWfCekWWM 0WiyOPOdNoukSB9U0OtNnsI7OYSYrG9IfKWLJtoqxfqbqEC52dGcKa/lOB0tLVNRsc JSL8QDJ538DD3vDEvO13FfbNNl2j0pWXkl04nJsg= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Keith Busch , Jens Axboe , Sasha Levin Subject: [PATCH AUTOSEL 4.19 41/73] block: Clear kernel memory before copying to user Date: Wed, 14 Nov 2018 17:21:35 -0500 Message-Id: <20181114222207.98701-41-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181114222207.98701-1-sashal@kernel.org> References: <20181114222207.98701-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Keith Busch [ Upstream commit f3587d76da05f68098ddb1cb3c98cc6a9e8a402c ] If the kernel allocates a bounce buffer for user read data, this memory needs to be cleared before copying it to the user, otherwise it may leak kernel memory to user space. Laurence Oberman Signed-off-by: Keith Busch Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/bio.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/bio.c b/block/bio.c index 0093bed81c0e..41173710430c 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1261,6 +1261,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q, if (ret) goto cleanup; } else { + zero_fill_bio(bio); iov_iter_advance(iter, bio->bi_iter.bi_size); } -- 2.17.1