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=-3.8 required=3.0 tests=BAYES_00, 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 CC81FC433DB for ; Wed, 30 Dec 2020 14:49:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8AFAB22227 for ; Wed, 30 Dec 2020 14:49:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726305AbgL3Otm (ORCPT ); Wed, 30 Dec 2020 09:49:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56460 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725853AbgL3Otl (ORCPT ); Wed, 30 Dec 2020 09:49:41 -0500 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 758A8C061799; Wed, 30 Dec 2020 06:49:01 -0800 (PST) Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94) (envelope-from ) id 1kucmY-001hOo-30; Wed, 30 Dec 2020 15:48:58 +0100 Message-ID: Subject: Re: [PATCH AUTOSEL 5.10 20/31] um: allocate a guard page to helper threads From: Johannes Berg To: Sasha Levin , linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Richard Weinberger , linux-um@lists.infradead.org Date: Wed, 30 Dec 2020 15:48:57 +0100 In-Reply-To: <20201230130314.3636961-20-sashal@kernel.org> References: <20201230130314.3636961-1-sashal@kernel.org> <20201230130314.3636961-20-sashal@kernel.org> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-malware-bazaar: not-scanned Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Wed, 2020-12-30 at 08:03 -0500, Sasha Levin wrote: > > We've been running into stack overflows in helper threads > corrupting memory For the record, that was mostly referring to "while development", so while this change makes a few things a bit safer, I don't think there's all that much point in backporting to stable; presumably things are working OK there for people, and developers will (hopefully) be working on mainline anyway. johannes