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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 781EDC43332 for ; Sat, 21 Mar 2020 06:45:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 24F6120753 for ; Sat, 21 Mar 2020 06:45:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="NNpbUJEo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 24F6120753 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AED106B0003; Sat, 21 Mar 2020 02:45:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A9D016B0005; Sat, 21 Mar 2020 02:45:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 98AEC6B0007; Sat, 21 Mar 2020 02:45:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0094.hostedemail.com [216.40.44.94]) by kanga.kvack.org (Postfix) with ESMTP id 7F3DB6B0003 for ; Sat, 21 Mar 2020 02:45:15 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 29ED1824556B for ; Sat, 21 Mar 2020 06:45:15 +0000 (UTC) X-FDA: 76618432590.08.fan56_10ba30aec731a X-HE-Tag: fan56_10ba30aec731a X-Filterd-Recvd-Size: 2594 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Sat, 21 Mar 2020 06:45:14 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (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 BBB79206F9; Sat, 21 Mar 2020 06:45:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584773113; bh=kCtRiTU7crd5ifKSb3kmQ7l5gFP8U6qpxWv87hCw/p8=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=NNpbUJEoMq2YS88femhVeYjAXVTEfjwAmJHB33aqr9h6UaOry15uZl8mcckGB3pg/ B68T8AYTq4GuH3+U/0dMUT+XnUSBgPtwAJkqHros+KGiRhbq1yDETi90l50ch484dr /zg6lJXhue6kSwpaU+IKrxZQ7y/LpEpvkFaxJ2jM= Date: Fri, 20 Mar 2020 23:45:13 -0700 From: Andrew Morton To: Entropy Moe <3ntr0py1337@gmail.com> Cc: Randy Dunlap , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: KASAN: stack-out-of-bounds Write in mpol_to_str Message-Id: <20200320234513.9b05abe1ade85712db2d6478@linux-foundation.org> In-Reply-To: References: <9e699198-d1e4-f285-f4ed-15fbf8a8c16e@infradead.org> 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-Bogosity: Ham, tests=bogofilter, spamicity=0.000028, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 20 Mar 2020 12:36:38 +0400 Entropy Moe <3ntr0py1337@gmail.com> wrote: > Hello Randy, > please see attached POC for the vulnerability. > Thanks. Ouch. afaict shmem's S_IFREG inode's mpol's preferred_node is messed up. I don't think anyone has worked on this code in a decade or more. Is someone up to taking a look please? > On Mon, Mar 16, 2020 at 10:46 PM Randy Dunlap wrote: > > > On 3/15/20 12:57 PM, Entropy Moe wrote: > > > Hello team, > > > how are you ? > > > I wanted to report a bug on mempolicy.c. I found the bug on the latest > > version of the kernel. > > > > > > which is stack out of bound vulnerability. > > > > > > I am attaching report. > > > > > > If you need the POC crash code, I can provide. > > > > Hi Moe, > > > > Please post the POC code and your kernel .config file. > > > > thanks. > > -- > > ~Randy > > > >