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=unavailable 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 8A619C2D0B1 for ; Tue, 4 Feb 2020 12:23:12 +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 3ECF52084E for ; Tue, 4 Feb 2020 12:23:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3ECF52084E 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 lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 48BkPB3RjvzDqNw for ; Tue, 4 Feb 2020 23:23:10 +1100 (AEDT) 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 48BjyJ3DsMzDqMC for ; Tue, 4 Feb 2020 23:03:20 +1100 (AEDT) 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 48BjyF4dRPzB3ww; Tue, 4 Feb 2020 23:03:17 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 6ec20aa2e510b6297906c45f009aa08b2d97269a In-Reply-To: To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Subject: Re: [PATCH v4 2/7] powerpc/32s: Fix bad_kuap_fault() Message-Id: <48BjyF4dRPzB3ww@ozlabs.org> Date: Tue, 4 Feb 2020 23:03:17 +1100 (AEDT) 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: linux-mm@kvack.org, 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, 2020-01-24 at 11:54:40 UTC, Christophe Leroy wrote: > At the moment, bad_kuap_fault() reports a fault only if a bad access > to userspace occurred while access to userspace was not granted. > > But if a fault occurs for a write outside the allowed userspace > segment(s) that have been unlocked, bad_kuap_fault() fails to > detect it and the kernel loops forever in do_page_fault(). > > Fix it by checking that the accessed address is within the allowed > range. > > Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection") > Cc: stable@vger.kernel.org # v5.2+ > Signed-off-by: Christophe Leroy > Signed-off-by: Michael Ellerman > Link: https://lore.kernel.org/r/1e07c7de4ffdd9cda35d1ffe8258af75579d3e91.1579715466.git.christophe.leroy@c-s.fr Patches 2-7 applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/6ec20aa2e510b6297906c45f009aa08b2d97269a cheers