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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A33EC5AC75 for ; Wed, 26 Jan 2022 02:25:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B5ED56B0071; Tue, 25 Jan 2022 21:25:55 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B0E096B0075; Tue, 25 Jan 2022 21:25:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9D6856B0078; Tue, 25 Jan 2022 21:25:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0155.hostedemail.com [216.40.44.155]) by kanga.kvack.org (Postfix) with ESMTP id 8FAC16B0071 for ; Tue, 25 Jan 2022 21:25:55 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 3C2378249980 for ; Wed, 26 Jan 2022 02:25:55 +0000 (UTC) X-FDA: 79070847870.07.EE01E54 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf18.hostedemail.com (Postfix) with ESMTP id B44A81C002D for ; Wed, 26 Jan 2022 02:25:54 +0000 (UTC) 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 dfw.source.kernel.org (Postfix) with ESMTPS id C99B1615F9; Wed, 26 Jan 2022 02:25:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB22BC340E0; Wed, 26 Jan 2022 02:25:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1643163953; bh=2i0dNkIQ1hr+oqd2smUFvkRp5ceQ2EOEXTxyE8SD98w=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=LAVawXj58Da+S7DVBP36hp/PLlCVDcV8Apz3X9OFevT1KnTmaaqT9GgeMfKG4T/AG Y9fFKZqq25/qfZMAoBYgqxjufcf0LEE9P9MzLJRaXiVQBhtHnNcrBs3tnCzM8ls1zB BqTOKkluSFu5a9meFnLDOy9Q76kHSdrxp8p8SKD0= Date: Tue, 25 Jan 2022 18:25:50 -0800 From: Andrew Morton To: Yury Norov Cc: Catalin Marinas , Will Deacon , Nicholas Piggin , Ding Tianhong , Anshuman Khandual , Matthew Wilcox , Alexey Klimov , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2] vmap(): don't allow invalid pages Message-Id: <20220125182550.7c693c76fe6520047c2e4f26@linux-foundation.org> In-Reply-To: <20220119012109.551931-1-yury.norov@gmail.com> References: <20220119012109.551931-1-yury.norov@gmail.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B44A81C002D X-Stat-Signature: 5jpe5afi839uybhgqoe8r4hgojycdhno Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=LAVawXj5; dmarc=none; spf=pass (imf18.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Rspam-User: nil X-HE-Tag: 1643163954-409538 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 18 Jan 2022 17:21:09 -0800 Yury Norov wrote: > vmap() takes struct page *pages as one of arguments, and user may provide > an invalid pointer which would lead to data abort at address translation > later. Does "user" mean userspace code? If so, please tell us much more about the means by which userspace can trigger this problem.