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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 596C4C433E0 for ; Mon, 8 Mar 2021 19:59:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 316D065268 for ; Mon, 8 Mar 2021 19:59:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231734AbhCHT6q (ORCPT ); Mon, 8 Mar 2021 14:58:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:54108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231542AbhCHT6e (ORCPT ); Mon, 8 Mar 2021 14:58:34 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id CC66864F11; Mon, 8 Mar 2021 19:58:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1615233514; bh=ygA/sL0vufWIpiGjBK0LvT8Z2IDSfslRvQdh6WJuHgg=; h=Date:From:To:Subject:From; b=QCJRBcCyvlLaGCnDk3Axp6bzj06zpzPLecvQfxehCqISHI22RSfge58qeQQbdXzqO FotA0gqLYRce3YX9NmcWhmo06wjRq2rW9dIOBWkmDjNBI/uJ903Yk1EH3vchPL2lm5 EOt6Cd75/yXI7BBiuXTRFBb6Mb4IpV3GTkjPgg4c= Date: Mon, 08 Mar 2021 11:58:33 -0800 From: akpm@linux-foundation.org To: andreyknvl@google.com, aryabinin@virtuozzo.com, Branislav.Rankov@arm.com, catalin.marinas@arm.com, dvyukov@google.com, elver@google.com, eugenis@google.com, glider@google.com, kevin.brodsky@arm.com, mm-commits@vger.kernel.org, pcc@google.com, stable@vger.kernel.org, vincenzo.frascino@arm.com, will.deacon@arm.com Subject: + kasan-fix-kasan_stack-dependency-for-hw_tags.patch added to -mm tree Message-ID: <20210308195833.fH2D8VroK%akpm@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch titled Subject: kasan: fix KASAN_STACK dependency for HW_TAGS has been added to the -mm tree. Its filename is kasan-fix-kasan_stack-dependency-for-hw_tags.patch This patch should soon appear at https://ozlabs.org/~akpm/mmots/broken-out/kasan-fix-kasan_stack-dependency-for-hw_tags.patch and later at https://ozlabs.org/~akpm/mmotm/broken-out/kasan-fix-kasan_stack-dependency-for-hw_tags.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Andrey Konovalov Subject: kasan: fix KASAN_STACK dependency for HW_TAGS There's a runtime failure when running HW_TAGS-enabled kernel built with GCC on hardware that doesn't support MTE. GCC-built kernels always have CONFIG_KASAN_STACK enabled, even though stack instrumentation isn't supported by HW_TAGS. Having that config enabled causes KASAN to issue MTE-only instructions to unpoison kernel stacks, which causes the failure. Fix the issue by disallowing CONFIG_KASAN_STACK when HW_TAGS is used. (The commit that introduced CONFIG_KASAN_HW_TAGS specified proper dependency for CONFIG_KASAN_STACK_ENABLE but not for CONFIG_KASAN_STACK.) Link: https://lkml.kernel.org/r/59e75426241dbb5611277758c8d4d6f5f9298dac.1615215441.git.andreyknvl@google.com Fixes: 6a63a63ff1ac ("kasan: introduce CONFIG_KASAN_HW_TAGS") Signed-off-by: Andrey Konovalov Reported-by: Catalin Marinas Cc: Cc: Will Deacon Cc: Vincenzo Frascino Cc: Dmitry Vyukov Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Marco Elver Cc: Peter Collingbourne Cc: Evgenii Stepanov Cc: Branislav Rankov Cc: Kevin Brodsky Signed-off-by: Andrew Morton --- lib/Kconfig.kasan | 1 + 1 file changed, 1 insertion(+) --- a/lib/Kconfig.kasan~kasan-fix-kasan_stack-dependency-for-hw_tags +++ a/lib/Kconfig.kasan @@ -156,6 +156,7 @@ config KASAN_STACK_ENABLE config KASAN_STACK int + depends on KASAN_GENERIC || KASAN_SW_TAGS default 1 if KASAN_STACK_ENABLE || CC_IS_GCC default 0 _ Patches currently in -mm which might be from andreyknvl@google.com are kasan-mm-fix-crash-with-hw_tags-and-debug_pagealloc.patch kasan-fix-kasan_stack-dependency-for-hw_tags.patch kasan-initialize-shadow-to-tag_invalid-for-sw_tags.patch mm-kasan-dont-poison-boot-memory-with-tag-based-modes.patch