From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by sourceware.org (Postfix) with ESMTPS id 19E69385B51F for ; Wed, 13 Dec 2023 08:49:03 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 19E69385B51F Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 19E69385B51F Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2a00:1450:4864:20::32b ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1702457344; cv=none; b=G7PnuAVw2m4MsCELZFXrCbh4b9B9FduQnylnCawKpfcn3csWJZBdUhSaXh43mWc5eYoAHhmDVVMlZ2CX0e6CvSlHFlfXGT3j4CdVwyEV2R9JNuaZzxP+PM28+vyfoxK19mStl7yuguG74eC3zdWCWLW1FP+G1/F0Nc2aXa8FKb8= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1702457344; c=relaxed/simple; bh=3iYD9RnPAzZn/twKQIifseItY/M9p2JS4Pz3uXMUgu8=; h=DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To; b=RGNrXJy5RKv7w4EO1jqb1wRhhSsFq4MLQRuBvxahRAiuy/nxNBhhKttK2YBo3pyyfYvaREmJRUhRaCQfd04HZPgoGh7604Fre4grpj+B8s/bFjZDW8fIYKvcUBBykvolhnMzguclniNPKpycL6M+EIE9oliDzcy1HCcQPqpGep0= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-40c4846847eso29302025e9.1 for ; Wed, 13 Dec 2023 00:49:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1702457342; x=1703062142; darn=gcc.gnu.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=3iYD9RnPAzZn/twKQIifseItY/M9p2JS4Pz3uXMUgu8=; b=WTSll2Z6I6oPrl/1GIihEoF+yFyCXuut3c0zf/vJ6e4taGmXYUu6YQnxwZ++M9xpOB kGxA8B9fZDdDcCSk0WnwfKW4L8qDwKDweo4f+thMt8K2k4KVpDimdcYjUKH5EM2uV/1r HAs/IOGsWHdU1b+twsWkSBHcAmtJHMfC4mBGzLOAgkorXpCDmDdXsLgzTRM4bpVOaLXz 6ENPcwLDRwgGaAN1dFylrxrd3sjpmGtU3twiGq2YMBhzDavp9ihfOid9+xDKR7h5Ai4q jzKHciuOuBfZmxRT7usMibkjs2dGY8Xlm6bn6Ep/9HBF34VdPeIYkngUVLUVGlDMRl92 KeQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702457342; x=1703062142; h=content-transfer-encoding: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=3iYD9RnPAzZn/twKQIifseItY/M9p2JS4Pz3uXMUgu8=; b=qFyWrgJi0CGYA8PPTIhlr9ymS2rtBVD8LSHJXgQdxiQjh1fruhSmOH3pR2PkuXgl3v yhGgPuwRzSQIxjhI0e/sjWKA2n/T1E6kRKRLPzXsZda7z1E8emi5jJlPI7qUQImEzhYm NFHgq7xC0A+pDu1WoWGt7x+fdJoNvyu8JqOyuE7Im6aFNtHi2QmtEnUJM7dlBtB2mTuM fIWiLsbhpMky2LbAwhAJAPPSd2cOokxZJOHG0wc318WTlXR4QqRTmbO4rMi0lftqB3ug FQVzPNH+fdxchB2oM15bUql4YAVSY/mxs1vetuGRtHtE0JWduH30GNcOQWFaWZWBSjsf XhjA== X-Gm-Message-State: AOJu0YxGcFR9QK/Vv1wbXeskXX+3FM5zfEvzHT6IJtx+E3tF2TXQDLT6 mu+5ANk2FfQeczKkHLC13wrmoKuZnMDAeJbhr/o= X-Google-Smtp-Source: AGHT+IFBk1lNKv3BcxKBdjQgOw3kbIIuMtHUxLUHRm6/4kNBX81PypqFHKgMOYx4nqumSh9nXBONTvkOTaO2J8UGnLQ= X-Received: by 2002:a05:600c:44e:b0:40c:6e8:610a with SMTP id s14-20020a05600c044e00b0040c06e8610amr4076458wmb.56.1702457341628; Wed, 13 Dec 2023 00:49:01 -0800 (PST) MIME-Version: 1.0 References: <20221219061758.23321-1-ashimida.1990@gmail.com> <20230325085416.95191-1-ashimida.1990@gmail.com> <20230327093016.GB4253@hirez.programming.kicks-ass.net> In-Reply-To: From: Dan Li Date: Wed, 13 Dec 2023 16:48:50 +0800 Message-ID: Subject: Re: [RFC/RFT,V2] CFI: Add support for gcc CFI in aarch64 To: Sami Tolvanen Cc: Peter Zijlstra , Aaron Tomlin , Alexander Potapenko , Alexander Shishkin , Alexandru Elisei , Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Arnaldo Carvalho de Melo , Arnd Bergmann , Boqun Feng , Borislav Petkov , Borislav Petkov , Brian Gerst , Catalin Marinas , Changbin Du , Christophe Leroy , Dave Hansen , Dmitry Torokhov , "Eric W. Biederman" , Frederic Weisbecker , gcc-patches@gcc.gnu.org, Greg Kroah-Hartman , "H. Peter Anvin" , Ingo Molnar , Jiri Olsa , Josh Poimboeuf , Juergen Gross , Kalesh Singh , Kees Cook , Kumar Kartikeya Dwivedi , Luis Chamberlain , Marco Elver , Mark Brown , Mark Rutland , Masahiro Yamada , Masami Hiramatsu , Michael Roth , Michal Marek , Miguel Ojeda , Namhyung Kim , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , "Paul E. McKenney" , Richard Sandiford , Song Liu , Thomas Gleixner , Tom Rix , Uros Bizjak , Will Deacon , x86@kernel.org, Yuntao Wang , Yu Zhao , Zhen Lei , 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, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, linux-perf-users@vger.kernel.org, wanglikun@lixiang.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,KAM_NUMSUBJECT,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: + Likun On Tue, 28 Mar 2023 at 06:18, Sami Tolvanen wrote= : > > On Mon, Mar 27, 2023 at 2:30=E2=80=AFAM Peter Zijlstra wrote: > > > > On Sat, Mar 25, 2023 at 01:54:16AM -0700, Dan Li wrote: > > > > > In the compiler part[4], most of the content is the same as Sami's > > > implementation[3], except for some minor differences, mainly includin= g: > > > > > > 1. The function typeid is calculated differently and it is difficult > > > to be consistent. > > > > This means there is an effective ABI break between the compilers, which > > is sad :-( Is there really nothing to be done about this? > > I agree, this would be unfortunate, and would also be a compatibility > issue with rustc where there's ongoing work to support > clang-compatible CFI type hashes: > > https://github.com/rust-lang/rust/pull/105452 > > Sami