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=-18.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 282CEC4361A for ; Thu, 3 Dec 2020 21:20:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D24EC2223E for ; Thu, 3 Dec 2020 21:20:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726677AbgLCVU5 (ORCPT ); Thu, 3 Dec 2020 16:20:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:35338 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726327AbgLCVU5 (ORCPT ); Thu, 3 Dec 2020 16:20:57 -0500 Subject: patch "iio:magnetometer:mag3110: Fix alignment and data leak issues." added to staging-testing DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1607030410; bh=YZd47szGDX6V/A/jY9+dJQ4J3xXLOp/LiUq6HZazQLc=; h=To:From:Date:From; b=xWC62aRTijSwy0mmpQqW5Ovi5+sSnez9FdKAoB+4Qj2YgiR0EH1qjsJm6qP2R7cLy QqPkuSOFOlXkdvyksq8BImnlXtdtXsR9lLFnDCkQOhBgU5mZ9Ub2RYisoH3vATW7ta 6+PURABuWOsMPnN4tZ1pt5RZPXzkAzpUb2SKg9TM= To: Jonathan.Cameron@huawei.com, Stable@vger.kernel.org, alexandru.ardelean@analog.com, lars@metafoo.de From: Date: Thu, 03 Dec 2020 22:19:10 +0100 Message-ID: <16070303501899@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is a note to let you know that I've just added the patch titled iio:magnetometer:mag3110: Fix alignment and data leak issues. to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-testing branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will be merged to the staging-next branch sometime soon, after it passes testing, and the merge window is open. If you have any questions about this process, please let me know. >From 89deb1334252ea4a8491d47654811e28b0790364 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sun, 20 Sep 2020 12:27:37 +0100 Subject: iio:magnetometer:mag3110: Fix alignment and data leak issues. One of a class of bugs pointed out by Lars in a recent review. iio_push_to_buffers_with_timestamp() assumes the buffer used is aligned to the size of the timestamp (8 bytes). This is not guaranteed in this driver which uses an array of smaller elements on the stack. As Lars also noted this anti pattern can involve a leak of data to userspace and that indeed can happen here. We close both issues by moving to a suitable structure in the iio_priv() data. This data is allocated with kzalloc() so no data can leak apart from previous readings. The explicit alignment of ts is not necessary in this case but does make the code slightly less fragile so I have included it. Fixes: 39631b5f9584 ("iio: Add Freescale mag3110 magnetometer driver") Reported-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron Reviewed-by: Alexandru Ardelean Cc: Link: https://lore.kernel.org/r/20200920112742.170751-4-jic23@kernel.org --- drivers/iio/magnetometer/mag3110.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/iio/magnetometer/mag3110.c b/drivers/iio/magnetometer/mag3110.c index 838b13c8bb3d..c96415a1aead 100644 --- a/drivers/iio/magnetometer/mag3110.c +++ b/drivers/iio/magnetometer/mag3110.c @@ -56,6 +56,12 @@ struct mag3110_data { int sleep_val; struct regulator *vdd_reg; struct regulator *vddio_reg; + /* Ensure natural alignment of timestamp */ + struct { + __be16 channels[3]; + u8 temperature; + s64 ts __aligned(8); + } scan; }; static int mag3110_request(struct mag3110_data *data) @@ -387,10 +393,9 @@ static irqreturn_t mag3110_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct mag3110_data *data = iio_priv(indio_dev); - u8 buffer[16]; /* 3 16-bit channels + 1 byte temp + padding + ts */ int ret; - ret = mag3110_read(data, (__be16 *) buffer); + ret = mag3110_read(data, data->scan.channels); if (ret < 0) goto done; @@ -399,10 +404,10 @@ static irqreturn_t mag3110_trigger_handler(int irq, void *p) MAG3110_DIE_TEMP); if (ret < 0) goto done; - buffer[6] = ret; + data->scan.temperature = ret; } - iio_push_to_buffers_with_timestamp(indio_dev, buffer, + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, iio_get_time_ns(indio_dev)); done: -- 2.29.2