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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 810A3C3A5A1 for ; Thu, 22 Aug 2019 13:37:37 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 392CA233A0 for ; Thu, 22 Aug 2019 13:37:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 392CA233A0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46Dlvf0TK2zDqVV for ; Thu, 22 Aug 2019 23:37:34 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 46DlGh4FjYzDrQ3 for ; Thu, 22 Aug 2019 23:09:00 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 46DlGh1NG5z9sP6; Thu, 22 Aug 2019 23:08:59 +1000 (AEST) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 45ff3c55958542c3b76075d59741297b8cb31cbb In-Reply-To: To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , Erhard F. From: Michael Ellerman Subject: Re: [PATCH] powerpc/kasan: fix parallele loading of modules. Message-Id: <46DlGh1NG5z9sP6@ozlabs.org> Date: Thu, 22 Aug 2019 23:08:59 +1000 (AEST) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, 2019-08-09 at 14:58:09 UTC, Christophe Leroy wrote: > Parallele loading of modules may lead to bad setup of shadow > page table entries. > > First, lets align modules so that two modules never share the same > shadow page. > > Second, ensure that two modules cannot allocate two page tables for > the same PMD entry at the same time. This is done by using > init_mm.page_table_lock in the same way as __pte_alloc_kernel() > > Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support") > Cc: stable@vger.kernel.org > Signed-off-by: Christophe Leroy Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/45ff3c55958542c3b76075d59741297b8cb31cbb cheers