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 C8AE6C2D0B1 for ; Tue, 4 Feb 2020 12:03:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7F03620730 for ; Tue, 4 Feb 2020 12:03:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7F03620730 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=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C66E16B0003; Tue, 4 Feb 2020 07:03:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BF00A6B0005; Tue, 4 Feb 2020 07:03:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ADF796B0006; Tue, 4 Feb 2020 07:03:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0152.hostedemail.com [216.40.44.152]) by kanga.kvack.org (Postfix) with ESMTP id 913DD6B0003 for ; Tue, 4 Feb 2020 07:03:24 -0500 (EST) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 3FB5E180AD802 for ; Tue, 4 Feb 2020 12:03:24 +0000 (UTC) X-FDA: 76452309528.05.roof31_74ef52d9a132c X-HE-Tag: roof31_74ef52d9a132c X-Filterd-Recvd-Size: 1892 Received: from ozlabs.org (ozlabs.org [203.11.71.1]) by imf17.hostedemail.com (Postfix) with ESMTP for ; Tue, 4 Feb 2020 12:03:23 +0000 (UTC) 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 Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org 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-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, 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