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=-5.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=unavailable 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 79868C31E52 for ; Sat, 15 Jun 2019 22:26:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5040021473 for ; Sat, 15 Jun 2019 22:26:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560637592; bh=9O6Q/YpH9T0Jy87acBbGfMKLCZ9nwn4uy+CqzEuR9Nk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=RSGtAAYy3OwkY7/xy7YO3fHqLeNAaMuzFwEUZn0FT6rrtnhTKEoJRe7duvAnc1yG+ 0nNl8phb27UZhFojKfljnRiUrDxhTOJR5iQQAoFNNMDGtlNcQ513TfpjuKiTZb4z9J br+8oe8Bm3k4TUbBla/1S6nJoWuwhmh1hxhKgXUw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726945AbfFOW0b (ORCPT ); Sat, 15 Jun 2019 18:26:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:43320 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726400AbfFOW0a (ORCPT ); Sat, 15 Jun 2019 18:26:30 -0400 Received: from localhost (unknown [107.242.116.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 58D2121473; Sat, 15 Jun 2019 22:26:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560637589; bh=9O6Q/YpH9T0Jy87acBbGfMKLCZ9nwn4uy+CqzEuR9Nk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=rWU6g7DnvdoLoOVs2HJ8GPVaG7D94We3EXY9tksIdbBZpjomLqcqusRyez95eQLX4 zioll8nc2dm4sSb4dfzKbTOf/EX2BTTVnfnS4gN2sOB10lagu7plZMF1uUlOZeGsZe v0M9DHAy1BrF8UnrFWdWp0Xd2Ofu+8bra6IdxiGs= Date: Sat, 15 Jun 2019 18:26:27 -0400 From: Sasha Levin To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, Venkata Narendra Kumar Gutta Subject: Re: [PATCH AUTOSEL 5.1 06/60] driver core: platform: Fix the usage of platform device name(pdev->name) Message-ID: <20190615222626.GR1513@sasha-vm> References: <20190604232212.6753-1-sashal@kernel.org> <20190604232212.6753-6-sashal@kernel.org> <20190605045846.GA21363@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20190605045846.GA21363@kroah.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 05, 2019 at 06:58:46AM +0200, Greg Kroah-Hartman wrote: >On Tue, Jun 04, 2019 at 07:21:16PM -0400, Sasha Levin wrote: >> From: Venkata Narendra Kumar Gutta >> >> [ Upstream commit edb16da34b084c66763f29bee42b4e6bb33c3d66 ] >> >> Platform core is using pdev->name as the platform device name to do >> the binding of the devices with the drivers. But, when the platform >> driver overrides the platform device name with dev_set_name(), >> the pdev->name is pointing to a location which is freed and becomes >> an invalid parameter to do the binding match. >> >> use-after-free instance: >> >> [ 33.325013] BUG: KASAN: use-after-free in strcmp+0x8c/0xb0 >> [ 33.330646] Read of size 1 at addr ffffffc10beae600 by task modprobe >> [ 33.339068] CPU: 5 PID: 518 Comm: modprobe Tainted: >> G S W O 4.19.30+ #3 >> [ 33.346835] Hardware name: MTP (DT) >> [ 33.350419] Call trace: >> [ 33.352941] dump_backtrace+0x0/0x3b8 >> [ 33.356713] show_stack+0x24/0x30 >> [ 33.360119] dump_stack+0x160/0x1d8 >> [ 33.363709] print_address_description+0x84/0x2e0 >> [ 33.368549] kasan_report+0x26c/0x2d0 >> [ 33.372322] __asan_report_load1_noabort+0x2c/0x38 >> [ 33.377248] strcmp+0x8c/0xb0 >> [ 33.380306] platform_match+0x70/0x1f8 >> [ 33.384168] __driver_attach+0x78/0x3a0 >> [ 33.388111] bus_for_each_dev+0x13c/0x1b8 >> [ 33.392237] driver_attach+0x4c/0x58 >> [ 33.395910] bus_add_driver+0x350/0x560 >> [ 33.399854] driver_register+0x23c/0x328 >> [ 33.403886] __platform_driver_register+0xd0/0xe0 >> >> So, use dev_name(&pdev->dev), which fetches the platform device name from >> the kobject(dev->kobj->name) of the device instead of the pdev->name. >> >> Signed-off-by: Venkata Narendra Kumar Gutta >> Signed-off-by: Greg Kroah-Hartman >> Signed-off-by: Sasha Levin >> --- >> drivers/base/platform.c | 8 ++++---- >> 1 file changed, 4 insertions(+), 4 deletions(-) > >Please drop this from everywhere as it was reverted from Linus's tree >because it causes big problems. Dropped from all branches, thanks! -- Thanks, Sasha