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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29901C433FE for ; Wed, 30 Nov 2022 12:42:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233552AbiK3Mmj (ORCPT ); Wed, 30 Nov 2022 07:42:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53142 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233918AbiK3Mmg (ORCPT ); Wed, 30 Nov 2022 07:42:36 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07CFB2BD8 for ; Wed, 30 Nov 2022 04:42:35 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B3979B81A7C for ; Wed, 30 Nov 2022 12:42:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E29D3C433C1; Wed, 30 Nov 2022 12:42:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669812152; bh=GRjGS5i/zixu/d/rdcqZ1QlptYxr8aRxr16aqJBrgSo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=M6VNy9M/8qVMjEaOzq0nbrSDjKyYFaa1YPhUg7z7kP7supC/LHoQY8t4kv7zL0Qli 3Me6o1t/v0bAkBodB07aoJnWQDlZXTRlSDUcI5C7lcpOGYGkOP1CiNWH6Iho7PQtkm LywRW0iIlHTLsWcnhWO06Tq+k4YATnhjVHOGtQoY= Date: Wed, 30 Nov 2022 13:42:23 +0100 From: Greg Kroah-Hartman To: Carlos Llamas Cc: stable@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com, Zi Fan Tan , Todd Kjos Subject: Re: [PATCH 5.10 0/6] binder: backports for data leak and UAF Message-ID: References: <20221130035805.1823970-1-cmllamas@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221130035805.1823970-1-cmllamas@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 30, 2022 at 03:57:59AM +0000, Carlos Llamas wrote: > This series of backports consists of 3 main patches from Todd submitted > upstream in [1]. The intention is to avoid untranslated data from the > senders to be visible to the target processes. More details of this > issue can be found in the same thread. > > Furthermore, Todd's patches also fix a use-after-free issue introduced > by commit 32e9f56a96d8 ("binder: don't detect sender/target during > buffer cleanup"). In which invalid userspace input causes unprocessed > objects to be incorrectly released. Any subsequent references to these > objects will trigger a UAF as noted by the following KASAN trace: > > [ 244.748468] ================================================================== > [ 244.750486] BUG: KASAN: use-after-free in binder_ioctl+0xb88/0x32e0 > [ 244.751276] Read of size 8 at addr ffff67b1865bea58 by task poc/593 > [ 244.752074] > [ 244.752725] CPU: 0 PID: 593 Comm: poc Not tainted 5.10.156 #1 > [ 244.753683] Hardware name: linux,dummy-virt (DT) > [ 244.754717] Call trace: > [ 244.755216] dump_backtrace+0x0/0x2a0 > [ 244.755836] show_stack+0x18/0x2c > [ 244.756306] dump_stack+0xf8/0x164 > [ 244.756807] print_address_description.constprop.0+0x9c/0x538 > [ 244.757590] kasan_report+0x120/0x200 > [ 244.758236] __asan_load8+0xa0/0xc4 > [ 244.758756] binder_ioctl+0xb88/0x32e0 > [ 244.759283] __arm64_sys_ioctl+0xd4/0x120 > [ 244.759677] el0_svc_common.constprop.0+0xac/0x270 > [ 244.760184] do_el0_svc+0x38/0xa0 > [ 244.760540] el0_svc+0x1c/0x2c > [ 244.760898] el0_sync_handler+0xe8/0x114 > [ 244.761419] el0_sync+0x180/0x1c0 > > This second issue along with the reference to the commit fixing it was > first reported by Zi Fan. > > The other 3 commits included in this series are simply upstream fixes > for the main patches. > > I've tested this series applied to 5.10 and 5.4 which fixes the issues > above as expected. So please pick these up for 5.10 and 5.4 stable. > > [1] https://lore.kernel.org/all/20211130185152.437403-1-tkjos@google.com/ > > Thanks, > Carlos Llamas > > Cc: Zi Fan Tan > Cc: Todd Kjos > Cc: Greg Kroah-Hartman All now queued up, thanks. greg k-h