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=-11.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,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 7947EC433E0 for ; Mon, 8 Mar 2021 21:40:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 448DE65173 for ; Mon, 8 Mar 2021 21:40:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230342AbhCHVje (ORCPT ); Mon, 8 Mar 2021 16:39:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229901AbhCHVja (ORCPT ); Mon, 8 Mar 2021 16:39:30 -0500 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CCF4EC06174A for ; Mon, 8 Mar 2021 13:39:30 -0800 (PST) Received: by mail-pj1-x1035.google.com with SMTP id fu20so413024pjb.2 for ; Mon, 08 Mar 2021 13:39:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=EWvWBXtE6LC0x5+EhuqOJ3oY9GpYiZIHnEJDU3K8dog=; b=V9eyL2u0XJmDG5RNYn9VW90WFHdcLmUmrYjRFb2W/FI5PHN2qvuoIt5fk6pFca77Qr GYVTw1ZGOEblHLF50/wN+6S4KnZVPUBFIVEyw9sjutI1VELk6x0ePk65StCSMbubi6CX ylNgM7vahd33gB3HCxv2YFdQEBdcbYToEXRrM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=EWvWBXtE6LC0x5+EhuqOJ3oY9GpYiZIHnEJDU3K8dog=; b=akMlwwEJtXDGEUGnSOMEoUMHtIyHLxKlWNmHMuXA77WrRQqQcfhd28wZODrHFIzu6x MWWSuDIm/ofaDmutRnaSNoCR64kya5E27+XQCMRDUCiO/n4vQdpAaR/MEc0ioEVQb+4R m129/dNpAejsBK7SDiRa5Bq9uQv5cyLx9J3HWltsr2gsV8JGspUsoJARcsM0swVN8+ZM EvzrmEfPL8p+mXHnVBQlcuFp0VJIHtJjySdyYp/ylItl4KHSXIkXmMVScax7Zm8EjwHH XMT5qK0ZZU44ZgiwRMS8fJBMfvOPRHxdsOkhvhyPl5Eyn3gAerQL0tsNin7zZvrxKWK+ RvWA== X-Gm-Message-State: AOAM533rGNMOKmU/CgGly7V8AAWQLyz07JbhDmQrCLl8DtdzJFWGIy+P slpFe1xTEFPJzA4Ap0AmSr160g== X-Google-Smtp-Source: ABdhPJxf/G9ECz/bN816wfYNhj9BXuNY8J89BAuOifZ7SnfHj190OKd5RixxaJ24ptL97/yYoLaveQ== X-Received: by 2002:a17:90a:29a3:: with SMTP id h32mr960430pjd.209.1615239570482; Mon, 08 Mar 2021 13:39:30 -0800 (PST) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id n5sm11149305pfq.44.2021.03.08.13.39.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Mar 2021 13:39:29 -0800 (PST) Date: Mon, 8 Mar 2021 13:39:28 -0800 From: Kees Cook To: Sami Tolvanen Cc: Masahiro Yamada , Nick Desaulniers , Nathan Chancellor , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Alistair Delva Subject: Re: [PATCH] kbuild: Allow LTO to be selected with KASAN_HW_TAGS Message-ID: <202103081339.B18898E@keescook> References: <20210308184656.1914947-1-samitolvanen@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210308184656.1914947-1-samitolvanen@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org On Mon, Mar 08, 2021 at 10:46:56AM -0800, Sami Tolvanen wrote: > While LTO with KASAN is normally not useful, hardware tag-based KASAN > can be used also in production kernels with ARM64_MTE. Therefore, allow > KASAN_HW_TAGS to be selected together with HAS_LTO_CLANG. > > Reported-by: Alistair Delva > Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook -- Kees Cook