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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6A88C433F5 for ; Fri, 1 Oct 2021 22:49:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 80C0B61AEF for ; Fri, 1 Oct 2021 22:49:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 80C0B61AEF 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=kvack.org Received: by kanga.kvack.org (Postfix) id 0AC7A940154; Fri, 1 Oct 2021 18:49:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 05CC6940121; Fri, 1 Oct 2021 18:49:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EB3E1940154; Fri, 1 Oct 2021 18:49:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0049.hostedemail.com [216.40.44.49]) by kanga.kvack.org (Postfix) with ESMTP id DF28C940121 for ; Fri, 1 Oct 2021 18:49:54 -0400 (EDT) Received: from smtpin32.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 623892D4C9 for ; Fri, 1 Oct 2021 22:49:54 +0000 (UTC) X-FDA: 78649362708.32.4ABF4FC Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf20.hostedemail.com (Postfix) with ESMTP id 23F70D000452 for ; Fri, 1 Oct 2021 22:49:54 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id D83D56105A; Fri, 1 Oct 2021 22:49:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1633128590; bh=t1s5Id57UQAxfr4vIW95kmieylyQ7mBTVJfI5xisW74=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=XnfPheFNziBnMj2DmDmdbHL/zvjtXEdvRmI/mOCcR5vZ9H9Np6oRILbEO/31JPXQC ZHVTGn7boRDP3ntf/1Ep6dF1/dNyhsSE7A5M9XzvtvZ9QbTK7Gjq1kOCR5N2QsVZJh FKYX5z0F/+BbMMhXU9sNboruPxSXYSMwi8ozx+ZY= Date: Fri, 1 Oct 2021 15:49:49 -0700 From: Andrew Morton To: Eric Dumazet Cc: linux-kernel , linux-mm , Eric Dumazet , syzbot , "Huang, Ying" , Mel Gorman Subject: Re: [PATCH v2] mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind() Message-Id: <20211001154949.98956c092734590e781ce672@linux-foundation.org> In-Reply-To: <20211001215630.810592-1-eric.dumazet@gmail.com> References: <20211001215630.810592-1-eric.dumazet@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: rspam02 X-Rspamd-Queue-Id: 23F70D000452 X-Stat-Signature: xjb8uq8df7w7xszugesf4t65xtd8ft84 Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=XnfPheFN; spf=pass (imf20.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-HE-Tag: 1633128594-425688 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 Fri, 1 Oct 2021 14:56:30 -0700 Eric Dumazet wrote: > From: Eric Dumazet > > syzbot reported access to unitialized memory in mbind() [1] I'm lazy. What memory is being accessed-unintialized? > Issue came with commit bda420b98505 ("numa balancing: migrate on > fault among multiple bound nodes") No cc:stable? What's the worst-case user-visible impact here?