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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 C31A1C433DF for ; Fri, 19 Jun 2020 15:36:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9AEC5206FA for ; Fri, 19 Jun 2020 15:36:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592580964; bh=jPxXse+cQPfEmZrr9f0Q4FwlTl3ase3YR4MRbsFeDCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GEoPoiaKqaQSSdq2rCCVc9BxgHYJzUDhTMMojmT4XhrEUOK/Lw983P2DQQ7bxWOZo l33DVS38PSbbTucuRgrC3ROINCfPv1FMTvTVpVMuUxxdPe1sspWIFO5hqToI3o25IJ +/NYPeLt9/qqBxu4Oq2A6+BWz5z/P+0CWi/az/Ok= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405048AbgFSPgC (ORCPT ); Fri, 19 Jun 2020 11:36:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:35284 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393798AbgFSPbR (ORCPT ); Fri, 19 Jun 2020 11:31:17 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9B62C20734; Fri, 19 Jun 2020 15:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592580677; bh=jPxXse+cQPfEmZrr9f0Q4FwlTl3ase3YR4MRbsFeDCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2IBpAg0DwYWqSsmQ0M9RuFlOUot4BR6pnOQI9nDTUMJjE7QY1G1WPkoUIPVfTMubo U916pe4NDVwn0rI279aGaVkUjutDa3uDQGJ0dDGqnR4gfWRXe0ZdE3LlOAvJigpAq/ 3OLZIoMDw2qY3jFvjcLq++1vLXhtPIZ8lb6srv4w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christophe Leroy , Michael Ellerman Subject: [PATCH 5.7 339/376] powerpc/kasan: Fix issues by lowering KASAN_SHADOW_END Date: Fri, 19 Jun 2020 16:34:17 +0200 Message-Id: <20200619141726.380553220@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141710.350494719@linuxfoundation.org> References: <20200619141710.350494719@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christophe Leroy commit 3a66a24f6060e6775f8c02ac52329ea0152d7e58 upstream. At the time being, KASAN_SHADOW_END is 0x100000000, which is 0 in 32 bits representation. This leads to a couple of issues: - kasan_remap_early_shadow_ro() does nothing because the comparison k_cur < k_end is always false. - In ptdump, address comparison for markers display fails and the marker's name is printed at the start of the KASAN area instead of being printed at the end. However, there is no need to shadow the KASAN shadow area itself, so the KASAN shadow area can stop shadowing memory at the start of itself. With a PAGE_OFFSET set to 0xc0000000, KASAN shadow area is then going from 0xf8000000 to 0xff000000. Fixes: cbd18991e24f ("powerpc/mm: Fix an Oops in kasan_mmu_init()") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/ae1a3c0d19a37410c209c3fc453634cfcc0ee318.1589866984.git.christophe.leroy@csgroup.eu Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/include/asm/kasan.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/arch/powerpc/include/asm/kasan.h +++ b/arch/powerpc/include/asm/kasan.h @@ -23,9 +23,7 @@ #define KASAN_SHADOW_OFFSET ASM_CONST(CONFIG_KASAN_SHADOW_OFFSET) -#define KASAN_SHADOW_END 0UL - -#define KASAN_SHADOW_SIZE (KASAN_SHADOW_END - KASAN_SHADOW_START) +#define KASAN_SHADOW_END (-(-KASAN_SHADOW_START >> KASAN_SHADOW_SCALE_SHIFT)) #ifdef CONFIG_KASAN void kasan_early_init(void);