From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by sourceware.org (Postfix) with ESMTPS id AEF063858C50 for ; Thu, 9 Feb 2023 05:32:18 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org AEF063858C50 Authentication-Results: sourceware.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=google.com Received: by mail-wr1-x42a.google.com with SMTP id m14so588559wrg.13 for ; Wed, 08 Feb 2023 21:32:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=w6z3lxwnln7Ypie34pRxdCgfXQDUlJU7iUw2s4xeNCQ=; b=hbv+iUmy8sb7UTevXZXSzxz4aaIUDG/plNczLQrgAbId4wPVrQ+MkUcq3aY+CY5S+3 rjawt/atll9AOMzPTfCwmorE8mJ0IW4ExC+pOffnmttwon2NgCXsQXAHNH70+CqH4Yet b6oLh+gnKxDrXWJ+sVkEhlEAuMsgo82g7kQbD0bRtom8ONxlwBf6CsHrI8kEQQPSr8cE 02FslNpxxsQJnKXlRV77g9pOv1nepBqVy0+lQY1q5jHCyV3MZ1/poYrNBSof/aw2ifvB XBsmv3sQsOevFgU/eI4a8Lch+EluHrUqqffry2uORieqI42qXv+KNAZGRuXumHYaK8Mh FeiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=w6z3lxwnln7Ypie34pRxdCgfXQDUlJU7iUw2s4xeNCQ=; b=LcIsU0r2xIAM3iR7uOozrcAzI9bvzW6WHRDSeLKoCo702qjGUZd9GsXXmn8WezNeLk 8tckp3nIqxN8CPqAfJFeH4p2okVh+sbkQ4Gw+hCNFnbZAkFgtdBilzSqjuWptXrWLxu9 dj2BYlR5BeBKTjwIRDoiUl2FT/0XoaWpaDPcSqWAgithjI4rszahlGCQnu8UTTlv/JR0 YxQ0zaEnJwev6rt1Rwr4faJOYvG9Youppfut1CzCFlPk8cbPOIlqXDTkbwFbOTk9ZTQl 13KZt+Ovx87aWCQLVkEkATmUkZ6gmrpCaPb6s6MBsIHL8CalEyr8OveJGSe0xb16pkEZ wygA== X-Gm-Message-State: AO0yUKVX0qFyS1FMfnr35fCYDc2OAvsT0I9TrZQ4MZt07r8737VvggGI 23c4+ASM5a2Boh/ugwRwIjhlkUPQU3tSx5VEiqKFGQ== X-Google-Smtp-Source: AK7set9YGa7NCNq2wHzwRqe7rRW1StB4rmp4kgxLGJELsL8k4ez/VaGVQujKbNDfKlqQkG5awGCGVr1ELO1GQ8rpFMA= X-Received: by 2002:a5d:4247:0:b0:2bf:b264:6bf7 with SMTP id s7-20020a5d4247000000b002bfb2646bf7mr251486wrr.427.1675920736829; Wed, 08 Feb 2023 21:32:16 -0800 (PST) MIME-Version: 1.0 References: <20221219055431.22596-1-ashimida.1990@gmail.com> In-Reply-To: <20221219055431.22596-1-ashimida.1990@gmail.com> From: Peter Collingbourne Date: Wed, 8 Feb 2023 21:32:03 -0800 Message-ID: Subject: Re: [RFC/RFT 0/3] Add compiler support for Control Flow Integrity To: Dan Li Cc: gcc-patches@gcc.gnu.org, Richard Sandiford , Masahiro Yamada , Michal Marek , Nick Desaulniers , Catalin Marinas , Will Deacon , Sami Tolvanen , Kees Cook , Nathan Chancellor , Tom Rix , Peter Zijlstra , "Paul E. McKenney" , Mark Rutland , Josh Poimboeuf , Frederic Weisbecker , "Eric W. Biederman" , Marco Elver , Christophe Leroy , Song Liu , Andrew Morton , Uros Bizjak , Kumar Kartikeya Dwivedi , Juergen Gross , Luis Chamberlain , Borislav Petkov , Masami Hiramatsu , Dmitry Torokhov , Aaron Tomlin , Kalesh Singh , Yuntao Wang , Changbin Du , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-19.4 required=5.0 tests=BAYES_00,DKIMWL_WL_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,USER_IN_DEF_DKIM_WL,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Sun, Dec 18, 2022 at 10:06 PM Dan Li wrote: > > This series of patches is mainly used to support the control flow > integrity protection of the linux kernel [1], which is similar to > -fsanitize=kcfi in clang 16.0 [2,3]. > > I hope that this feature will also support user-mode CFI in the > future (at least for developers who can recompile the runtime), > so I use -fsanitize=cfi as a compilation option here. Please don't. The various CFI-related build flags are confusing enough without also having this inconsistency between Clang and GCC. Peter