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 53F6AC4332B for ; Sat, 21 Mar 2020 11:37:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 30A7020722 for ; Sat, 21 Mar 2020 11:37:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728835AbgCULh4 (ORCPT ); Sat, 21 Mar 2020 07:37:56 -0400 Received: from ozlabs.org ([203.11.71.1]:39969 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727033AbgCULhy (ORCPT ); Sat, 21 Mar 2020 07:37:54 -0400 Received: by ozlabs.org (Postfix, from userid 1034) id 48kzCg4YfDz9sSg; Sat, 21 Mar 2020 22:37:51 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: af3d0a68698c7e5df8b72267086b23422a3954bb In-Reply-To: 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] powerpc/kasan: Fix shadow memory protection with CONFIG_KASAN_VMALLOC Message-Id: <48kzCg4YfDz9sSg@ozlabs.org> Date: Sat, 21 Mar 2020 22:37:51 +1100 (AEDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2020-03-06 at 16:49:49 UTC, Christophe Leroy wrote: > With CONFIG_KASAN_VMALLOC, new page tables are created at the time > shadow memory for vmalloc area in unmapped. If some parts of the > page table still has entries to the zero page shadow memory, the > entries are wrongly marked RW. > > With CONFIG_KASAN_VMALLOC, almost the entire kernel address space > is managed by KASAN. To make it simple, just create KASAN page tables > for the entire kernel space at kasan_init(). That doesn't use much > more space, and that's anyway already done for hash platforms. > > Fixes: 3d4247fcc938 ("powerpc/32: Add support of KASAN_VMALLOC") > Signed-off-by: Christophe Leroy Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/af3d0a68698c7e5df8b72267086b23422a3954bb cheers