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=-5.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_MUTT 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 087ECC282DE for ; Wed, 5 Jun 2019 04:58:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D30712083E for ; Wed, 5 Jun 2019 04:58:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559710730; bh=DEf0Y+bhQL478Uky0AAR8FzgVDMCNOv8h9CVgUfkA2k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=CgEZGAWDhTLbVmU0nxFqzHP0A8tphrl5iikV1fxnORm2Kl6HeuYKJYNbkClRigJdh /iYIxghaw5cav++8CwTvp+CS3ULo34ZonAsxeZ7wfyq31wgj98UmSOtyS6cMxxwokN hfnbw6m5fzKIjo/YK3m3AMK38UUO3FgqRsZA3aCE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726399AbfFEE6u (ORCPT ); Wed, 5 Jun 2019 00:58:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:42216 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725268AbfFEE6u (ORCPT ); Wed, 5 Jun 2019 00:58:50 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 4EC602083E; Wed, 5 Jun 2019 04:58:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559710729; bh=DEf0Y+bhQL478Uky0AAR8FzgVDMCNOv8h9CVgUfkA2k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=q2gD34iPnsroQVtI3ep7Kp1IB2RIVemKkGlksaJ8CwIFffKNJJrcDJv1XxCjjzsm9 UyMmf3AVftsNzK5xwXyJJPsdq5LdJFK6EodMpMcWtsCbPYJMF8/tpLs1wBxamavn4S ITJQs9/VPmEfj5n1r6VjGdgTcln2yaJHpBg18FyA= Date: Wed, 5 Jun 2019 06:58:46 +0200 From: Greg Kroah-Hartman To: Sasha Levin 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: <20190605045846.GA21363@kroah.com> References: <20190604232212.6753-1-sashal@kernel.org> <20190604232212.6753-6-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190604232212.6753-6-sashal@kernel.org> User-Agent: Mutt/1.12.0 (2019-05-25) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 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. thanks, greg k-h