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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 81923C433F5 for ; Fri, 18 Mar 2022 14:37:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cNtVnUJTYs3OpXqHAkzx8S2eV9A3WZFgmWaISUkHV/8=; b=gHJzTFDxz2WCIL x3PWikfpfKyo/9Lrfd00j+svDx6ykWhRjUrhtMJuxzM8gwxiF3EzJN4X3zivshjdssp/jQdLx9P0U SBephke6UJz2E44nINv2auE5SDV91BcepNmXDcj93X4SCa84Cs8pF6HV5/CF8VuA319bf+kPDEqxV JnGYuGz6SK/xuh1R+d/8FHtHpjM87o0YJfJl+DFg850H9eXNy7wB+SIzXKvGEtCjB7m5zoCCyd1Z+ qna8YGuNAyUpmsOHE7CraQomIzngrGTx7UDhM6lwwmIqzoAMnoElK7Ino4KIdTrmNIxnUL1gkXau8 zVYPYsbHVo7uCJA3oM5Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nVDjd-001zwx-ML; Fri, 18 Mar 2022 14:37:45 +0000 Received: from sin.source.kernel.org ([145.40.73.55]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nVDd1-001wyf-U6; Fri, 18 Mar 2022 14:30:57 +0000 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 sin.source.kernel.org (Postfix) with ESMTPS id 1E241CE28F8; Fri, 18 Mar 2022 14:30:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A91AFC340E8; Fri, 18 Mar 2022 14:30:47 +0000 (UTC) Date: Fri, 18 Mar 2022 14:30:43 +0000 From: Catalin Marinas To: Kuan-Ying Lee Cc: Andrew Morton , Matthias Brugger , chinwen.chang@mediatek.com, nicholas.tang@mediatek.com, yee.lee@mediatek.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: Re: [PATCH] mm/kmemleak: Reset tag when compare object pointer Message-ID: References: <20220318034051.30687-1-Kuan-Ying.Lee@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220318034051.30687-1-Kuan-Ying.Lee@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220318_073056_376949_64773653 X-CRM114-Status: GOOD ( 10.47 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Fri, Mar 18, 2022 at 11:40:48AM +0800, Kuan-Ying Lee wrote: > When we use HW-tag based kasan and enable vmalloc support, we hit > the following bug. It is due to comparison between tagged object > and non-tagged pointer. > > We need to reset the kasan tag when we need to compare tagged object > and non-tagged pointer. > > [ 7.690429][T400001] init: kmemleak: [name:kmemleak&]Scan area larger than object 0xffffffe77076f440 > [ 7.691762][T400001] init: CPU: 4 PID: 1 Comm: init Tainted: G S W 5.15.25-android13-0-g5cacf919c2bc #1 > [ 7.693218][T400001] init: Hardware name: MT6983(ENG) (DT) > [ 7.693983][T400001] init: Call trace: > [ 7.694508][T400001] init: dump_backtrace.cfi_jt+0x0/0x8 > [ 7.695272][T400001] init: dump_stack_lvl+0xac/0x120 > [ 7.695985][T400001] init: add_scan_area+0xc4/0x244 > [ 7.696685][T400001] init: kmemleak_scan_area+0x40/0x9c > [ 7.697428][T400001] init: layout_and_allocate+0x1e8/0x288 > [ 7.698211][T400001] init: load_module+0x2c8/0xf00 > [ 7.698895][T400001] init: __se_sys_finit_module+0x190/0x1d0 > [ 7.699701][T400001] init: __arm64_sys_finit_module+0x20/0x30 > [ 7.700517][T400001] init: invoke_syscall+0x60/0x170 > [ 7.701225][T400001] init: el0_svc_common+0xc8/0x114 > [ 7.701933][T400001] init: do_el0_svc+0x28/0xa0 > [ 7.702580][T400001] init: el0_svc+0x60/0xf8 > [ 7.703196][T400001] init: el0t_64_sync_handler+0x88/0xec > [ 7.703964][T400001] init: el0t_64_sync+0x1b4/0x1b8 > [ 7.704658][T400001] init: kmemleak: [name:kmemleak&]Object 0xf5ffffe77076b000 (size 32768): > [ 7.705824][T400001] init: kmemleak: [name:kmemleak&] comm "init", pid 1, jiffies 4294894197 > [ 7.707002][T400001] init: kmemleak: [name:kmemleak&] min_count = 0 > [ 7.707886][T400001] init: kmemleak: [name:kmemleak&] count = 0 > [ 7.708718][T400001] init: kmemleak: [name:kmemleak&] flags = 0x1 > [ 7.709574][T400001] init: kmemleak: [name:kmemleak&] checksum = 0 > [ 7.710440][T400001] init: kmemleak: [name:kmemleak&] backtrace: > [ 7.711284][T400001] init: module_alloc+0x9c/0x120 > [ 7.712015][T400001] init: move_module+0x34/0x19c > [ 7.712735][T400001] init: layout_and_allocate+0x1c4/0x288 > [ 7.713561][T400001] init: load_module+0x2c8/0xf00 > [ 7.714291][T400001] init: __se_sys_finit_module+0x190/0x1d0 > [ 7.715142][T400001] init: __arm64_sys_finit_module+0x20/0x30 > [ 7.716004][T400001] init: invoke_syscall+0x60/0x170 > [ 7.716758][T400001] init: el0_svc_common+0xc8/0x114 > [ 7.717512][T400001] init: do_el0_svc+0x28/0xa0 > [ 7.718207][T400001] init: el0_svc+0x60/0xf8 > [ 7.718869][T400001] init: el0t_64_sync_handler+0x88/0xec > [ 7.719683][T400001] init: el0t_64_sync+0x1b4/0x1b8 > > Signed-off-by: Kuan-Ying Lee Reviewed-by: Catalin Marinas _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek