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=-5.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 AC7CCC433E0 for ; Fri, 5 Mar 2021 17:54:31 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 27579650A5 for ; Fri, 5 Mar 2021 17:54:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 27579650A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JNytNDiDl8c1I3K1dlHYV6r9MWsNHTn1lDfzHqkCh40=; b=I1MLA2Rof8Gbu1ix8WMCJ6sVz 86BgcgU88DBL/k+4DAaJnvweveVu+P39SU91eb1jrOv+6qpjXlFd8jXy9QYCR8EHukkH4q5iaHwo+ jfRtRhM1lDsTdlWzmxiRNRh7qBeRs+CE85fn7L2y56zu3Hp/SSORI/EHsF22oLb2SqZ/i4GPfFNLI KJS/S9MxdUmTZEj3rlgNneDLDf31+VgFgXtYPo9hgCkkNAU6yD/Zsy+YsA/C/UKfOGshPZQ87MgH7 61A957lomMUqklJ+bM7x40BFnqzvnUXse53y6C0p6FSwsg+tVi2YD+YAtC4l/QLev+XbDxukN36yu EqO5YQWMQ==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lIEdB-00FrEt-TG; Fri, 05 Mar 2021 17:52:54 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lIEd6-00FrDn-4u for linux-arm-kernel@lists.infradead.org; Fri, 05 Mar 2021 17:52:50 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id B7D49650A3; Fri, 5 Mar 2021 17:52:45 +0000 (UTC) Date: Fri, 5 Mar 2021 17:52:43 +0000 From: Catalin Marinas To: Andrey Konovalov Cc: Linux ARM , Vincenzo Frascino , kasan-dev , Will Deacon Subject: Re: arm64 KASAN_HW_TAGS panic on non-MTE hardware on 5.12-rc1 Message-ID: <20210305175243.GH23855@arm.com> References: <20210305171108.GD23855@arm.com> <20210305175124.GG23855@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210305175124.GG23855@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210305_175248_610444_047AEAFC X-CRM114-Status: GOOD ( 12.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Mar 05, 2021 at 05:51:26PM +0000, Catalin Marinas wrote: > On Fri, Mar 05, 2021 at 06:27:45PM +0100, Andrey Konovalov wrote: > > On Fri, Mar 5, 2021 at 6:11 PM Catalin Marinas wrote: > > > Enabling CONFIG_KASAN_HW_TAGS and running the resulting kernel on > > > non-MTE hardware panics with an undefined STG instruction from > > > mte_set_mem_tag_range(): > > > > > > ./scripts/faddr2line vmlinux kasan_unpoison_task_stack+0x18/0x40 > > > kasan_unpoison_task_stack+0x18/0x40: > > > mte_set_mem_tag_range at arch/arm64/include/asm/mte-kasan.h:71 > > > (inlined by) mte_set_mem_tag_range at arch/arm64/include/asm/mte-kasan.h:56 > > > (inlined by) kasan_unpoison at mm/kasan/kasan.h:363 > > > (inlined by) kasan_unpoison_task_stack at mm/kasan/common.c:72 > > > > This is weird. kasan_unpoison_task_stack() is only defined when > > CONFIG_KASAN_STACK is enabled, which shouldn't be enablable for > > HW_TAGS. > > CONFIG_KASAN=y > # CONFIG_KASAN_GENERIC is not set > CONFIG_KASAN_HW_TAGS=y > CONFIG_KASAN_STACK=1 >From Kconfig: config KASAN_STACK int default 1 if KASAN_STACK_ENABLE || CC_IS_GCC default 0 and I use gcc. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel