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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 AE7B5C433EA for ; Tue, 14 Jul 2020 18:55:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8042321D79 for ; Tue, 14 Jul 2020 18:55:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752955; bh=ONj7aKbHlOlgWW2rGPQ0J/OhBHcYbrSt/+Ss/muTSBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WAvNgJ7X4Gfc/LdHCs2+NzzC45y4kYZC9HxIbBPa11WIxlebCWKcoLaWf4xzyY+5a mZ8PdI9XBKiXCDcRrXwFPu4oT+peFHZZYfCX8dtLHUzHQsB3hoyk7sK4UCPUdcsXFh nIwsFwO98Qv5fVGRGaqMfXa3NXLDaFISh4ur6RE8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730292AbgGNSzx (ORCPT ); Tue, 14 Jul 2020 14:55:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:53576 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730895AbgGNSzt (ORCPT ); Tue, 14 Jul 2020 14:55:49 -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 5BC4321D79; Tue, 14 Jul 2020 18:55:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752948; bh=ONj7aKbHlOlgWW2rGPQ0J/OhBHcYbrSt/+Ss/muTSBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Pllvgva5P8cG0dc2ov9uJHIzlRgL/p85VJWi+6ULeH/v39D7sf2OzrOmVE1qs+ytU ARlKIUP+MBWnW+bmjhHRIFu0Dt1V8PKs1m9fL+lxeT9+ScqUA36c9kwhS3VYXkBDy4 LuLgBADwlSMjNluWjLI/26wR/hzzxRF5A85lY/lw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Sasha Levin , Alexander Egorenkov Subject: [PATCH 5.7 031/166] s390/kasan: fix early pgm check handler execution Date: Tue, 14 Jul 2020 20:43:16 +0200 Message-Id: <20200714184117.367925529@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200714184115.844176932@linuxfoundation.org> References: <20200714184115.844176932@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: Vasily Gorbik [ Upstream commit 998f5bbe3dbdab81c1cfb1aef7c3892f5d24f6c7 ] Currently if early_pgm_check_handler is called it ends up in pgm check loop. The problem is that early_pgm_check_handler is instrumented by KASAN but executed without DAT flag enabled which leads to addressing exception when KASAN checks try to access shadow memory. Fix that by executing early handlers with DAT flag on under KASAN as expected. Reported-and-tested-by: Alexander Egorenkov Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- arch/s390/kernel/early.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index cd241ee66eff4..0782772318580 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -170,6 +170,8 @@ static noinline __init void setup_lowcore_early(void) psw_t psw; psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; + if (IS_ENABLED(CONFIG_KASAN)) + psw.mask |= PSW_MASK_DAT; psw.addr = (unsigned long) s390_base_ext_handler; S390_lowcore.external_new_psw = psw; psw.addr = (unsigned long) s390_base_pgm_handler; -- 2.25.1