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 D4D80C433DF for ; Fri, 19 Jun 2020 15:59:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1B2D20809 for ; Fri, 19 Jun 2020 15:59:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592582396; bh=jPxXse+cQPfEmZrr9f0Q4FwlTl3ase3YR4MRbsFeDCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KSKg9UY8UyimWB3emclv6qgQk4PUFNM6hcqkQSwBzdbi31dj7B6w5W3wElCiAAcfJ fibOW/R4Z2VpRSbrh4iXmaWsxGVhzwbRPQ0kiaJk95VPkhli+fdgJBExHZDykUv7w+ gMIVAw9Ytua9SC0cLk7nmwkdXzgfetZoDHm6lS7I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393161AbgFSP7y (ORCPT ); Fri, 19 Jun 2020 11:59:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:45502 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392339AbgFSPO4 (ORCPT ); Fri, 19 Jun 2020 11:14:56 -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 158B8218AC; Fri, 19 Jun 2020 15:14:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592579695; bh=jPxXse+cQPfEmZrr9f0Q4FwlTl3ase3YR4MRbsFeDCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QLmxtxFOJRoY8yrQeoYYpuhsKNL4BaMneTfVeI4yAH93STCWOL3MJ0oGUmB1QX7gf K3lVM0CHQIdXmg29atxR2MuVAFe5fcawdXUpfT1ExOkOSvWAUwr7J2F3et5N6aFXBN lyrTOhR7Z6FRmq+Qgh/hnJ7oAKEKh0xDrk/mfEXU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christophe Leroy , Michael Ellerman Subject: [PATCH 5.4 232/261] powerpc/kasan: Fix issues by lowering KASAN_SHADOW_END Date: Fri, 19 Jun 2020 16:34:03 +0200 Message-Id: <20200619141700.994873502@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141649.878808811@linuxfoundation.org> References: <20200619141649.878808811@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);