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 28DE2C433EF for ; Fri, 7 Jan 2022 23:46:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9DA8F6B0072; Fri, 7 Jan 2022 18:46:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 989456B0073; Fri, 7 Jan 2022 18:46:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 877946B0074; Fri, 7 Jan 2022 18:46:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0253.hostedemail.com [216.40.44.253]) by kanga.kvack.org (Postfix) with ESMTP id 780816B0072 for ; Fri, 7 Jan 2022 18:46:24 -0500 (EST) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1608B1820751B for ; Fri, 7 Jan 2022 23:46:24 +0000 (UTC) X-FDA: 79005127488.28.48C1489 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf15.hostedemail.com (Postfix) with ESMTP id 8F9BFA0003 for ; Fri, 7 Jan 2022 23:46:23 +0000 (UTC) Received: from mail.kernel.org (unknown [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 10711B8279D; Fri, 7 Jan 2022 23:46:22 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 527C360F3A; Fri, 7 Jan 2022 23:46:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1641599180; bh=4q0+90zvPIBLHLdx2HHkK1M/CzRQoVeNU0/BZbcDtK4=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=un+W4+AC5LZXVLLAY9lzVWSjXskTdyy32w+NPCOWV8mveY9VDV4MfWnAqYNNhTW7b eVz15R389DlC7qi0toQ++jKOgzlKVsYXeAtKA13P8fPGjPIljXpjpBFkt1SJc6cPbo N8xiFFtpAB1IvUp2VOB8sMI/w6lfT9mCXeSGk08k= Date: Fri, 7 Jan 2022 15:46:18 -0800 From: Andrew Morton To: Helge Deller Cc: Linux Kernel , linux-mm@kvack.org, linux-parisc@vger.kernel.org Subject: Re: [PATCH] usercopy: Do not fail on memory from former init sections Message-Id: <20220107154618.8c34696c07cea62cdd54c5b2@linux-foundation.org> In-Reply-To: References: 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-Stat-Signature: 9x7fuj49gfbim7j4gf9auze3541p97en X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 8F9BFA0003 Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=un+W4+AC; spf=pass (imf15.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-HE-Tag: 1641599183-57671 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 7 Jan 2022 01:19:24 +0100 Helge Deller wrote: > On some platforms the memory area between the _stext and the _etext > symbols includes the init sections (parisc and csky). If the init > sections are freed after bootup, the kernel may reuse this memory. > > In one test the usercopy checks if the given address is inside the .text > section (from _stext to _etext), and it wrongly fails on the mentioned > platforms if the memory is from the former init section. > > Fix this failure by first checking against the init sections before > checking against the _stext/_etext section. > > Signed-off-by: Helge Deller > Fixes: 98400ad75e95 ("parisc: Fix backtrace to always include init funtion names") > And 98400ad75e95 has cc:stable so we'll want cc:stable on this patch also, yes?