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=-23.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL 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 F0226C433FE for ; Wed, 9 Dec 2020 18:52:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BD2A32228A for ; Wed, 9 Dec 2020 18:52:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387510AbgLISv6 (ORCPT ); Wed, 9 Dec 2020 13:51:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387443AbgLISv6 (ORCPT ); Wed, 9 Dec 2020 13:51:58 -0500 Received: from mail-ot1-x343.google.com (mail-ot1-x343.google.com [IPv6:2607:f8b0:4864:20::343]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8C13C0613CF for ; Wed, 9 Dec 2020 10:51:17 -0800 (PST) Received: by mail-ot1-x343.google.com with SMTP id j12so2400253ota.7 for ; Wed, 09 Dec 2020 10:51:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YT5BHJcxpuXHRj14Xs4MOizg/4PTRYgUUf1aSMIZM3Y=; b=Hc+1o93cAMl1ROHeeYK6Kbiz3vyKi1cQ31vynsXzwNw/FN4xhHJq36IYk3VLEg06k0 BT/p1ci4U+C/TFSkW1Uog19rU5q1AcvQVcgtWo3I/xFQEx8gZVNeSGOQgNukUrYZDz6K rx2BHlLuQuUR30NB1eQ7S4AmoWJf1/iQWX0bo02SKN6fpg8NNM5slv861Z3G98QRi48m RFhusNMk0juk4N6Vwhoo96QLnGw7fzN8U+fPk5l2k5h6HKGy1VE6lAFsbaXJg/Jt7wN0 sCKF4oabqEAN5XGW8fjbtaBCa0T7YU65ZcLlJUeumQe5dDBxG3hrDrXqYl3ujR9mfoqY bErQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YT5BHJcxpuXHRj14Xs4MOizg/4PTRYgUUf1aSMIZM3Y=; b=Zm4JJ3aOUX5Y8RRYGVvniLaomIpAx5dwiO04Ofkbq/qCdCrM797Wv+1OLJapZsYTgG 029youdFGo9Jfzbx0io4BsaMlR18BgvBEMtP9Fr6E0oPcYqgM3nMDTaUI6rIlJ7gAscH 8iM0aRvrxjD31sWulxnwkXSpikbXsocAfXnyXrfNscxn23xYOE31ysnDNWMzTojsD29b VJG5L3nN1WDa1j46fAnWz2ADlUGlKKVom/NpK6u3CiQhpTRA2A4ngX0VhwUi44pPh1Ia gs0Jiz4S8ZAZkmeVfB00XXMNXjStovzFDyGLFa2VT1O0iarMcPAgwpV8Fvu9KR7dh2eR dyJA== X-Gm-Message-State: AOAM533qHYc53364FEpPwyZJPHf6V+4xOxhvJv2PwVcI2RvdYgcviZ0B IZCkATEJWMBbMAwjGyousc7KV9AfRljDHwoTOC9SRw== X-Google-Smtp-Source: ABdhPJzjg43trPv/rgu+HRPFPFmTDSamvp5BPSMCfszGWyUgt789RrPbJTDwY25i1OliM5E4KsPW5RTWipc+t3ILdmA= X-Received: by 2002:a9d:7cc8:: with SMTP id r8mr3011278otn.233.1607539877102; Wed, 09 Dec 2020 10:51:17 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Marco Elver Date: Wed, 9 Dec 2020 19:51:05 +0100 Message-ID: Subject: Re: [PATCH mm 2/2] Revert "kasan, arm64: don't allow SW_TAGS with ARM64_MTE" To: Andrey Konovalov Cc: Andrew Morton , Catalin Marinas , Will Deacon , Vincenzo Frascino , Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , kasan-dev , Linux ARM , Linux Memory Management List , LKML Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 9 Dec 2020 at 19:24, Andrey Konovalov wrote: > > This reverts "kasan, arm64: don't allow SW_TAGS with ARM64_MTE". > > In earlier versions on the hardware tag-based KASAN patchset in-kernel > MTE used to be always enabled when CONFIG_ARM64_MTE is on. This caused > conflicts with the software tag-based KASAN mode. > > This is no logner the case: in-kernel MTE is never enabled unless the > CONFIG_KASAN_HW_TAGS is enabled, so there are no more conflicts with > CONFIG_KASAN_SW_TAGS. > > Allow CONFIG_KASAN_SW_TAGS to be enabled even when CONFIG_ARM64_MTE is > enabled. > > Signed-off-by: Andrey Konovalov Reviewed-by: Marco Elver > --- > arch/arm64/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 6fefab9041d8..62a7668976a2 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -135,7 +135,7 @@ config ARM64 > select HAVE_ARCH_JUMP_LABEL > select HAVE_ARCH_JUMP_LABEL_RELATIVE > select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48) > - select HAVE_ARCH_KASAN_SW_TAGS if (HAVE_ARCH_KASAN && !ARM64_MTE) > + select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN > select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE) > select HAVE_ARCH_KFENCE > select HAVE_ARCH_KGDB > -- > 2.29.2.576.ga3fc446d84-goog >