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 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 7EDA9C3F2D7 for ; Fri, 6 Mar 2020 00:28:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 604B520801 for ; Fri, 6 Mar 2020 00:28:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727193AbgCFA1y (ORCPT ); Thu, 5 Mar 2020 19:27:54 -0500 Received: from bilbo.ozlabs.org ([203.11.71.1]:53273 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726436AbgCFA1n (ORCPT ); Thu, 5 Mar 2020 19:27:43 -0500 Received: by ozlabs.org (Postfix, from userid 1034) id 48YT3K1BwNz9sRY; Fri, 6 Mar 2020 11:27:40 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 9e27086292aa880921a0f2b8501e5189d5efcf03 In-Reply-To: <8ee3bdbbdfdfc64ca7001e90c43b2aee6f333578.1580470482.git.christophe.leroy@c-s.fr> To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/2] powerpc/32: Warn and return ENOSYS on syscalls from kernel Message-Id: <48YT3K1BwNz9sRY@ozlabs.org> Date: Fri, 6 Mar 2020 11:27:40 +1100 (AEDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2020-01-31 at 11:34:54 UTC, Christophe Leroy wrote: > Since commit b86fb88855ea ("powerpc/32: implement fast entry for > syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32: > implement fast entry for syscalls on BOOKE"), syscalls from > kernel are unexpected and can have catastrophic consequences > as it will destroy the kernel stack. > > Test MSR_PR on syscall entry. In case syscall is from kernel, > emit a warning and return ENOSYS error. > > Signed-off-by: Christophe Leroy Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/9e27086292aa880921a0f2b8501e5189d5efcf03 cheers