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a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1611939250; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=3nmxG9zx/ufQcZZ9qPcwj0Y4gElgmjQQmf2oS3fd2xI=; b=aJraT5uyeVWeQyg0Bf3AbGe7aAcdjvPii5kgNIUxn5TAOj5l8BDxs6LRNOxTPFc8w9GIgg p6YX2BbyfLW8Is9fBCJPgOknwYBkBNRGbe0QbMTgORUyMOxD50kd8nyCRt3WYDNKbfFIGb GRtG/qAJTIvdLDy5tptlVvca3KgjOk8= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 06D88ACB7; Fri, 29 Jan 2021 16:54:10 +0000 (UTC) Subject: Re: [PATCH] x86: Disable CET instrumentation in the kernel To: Josh Poimboeuf , Borislav Petkov Cc: x86@kernel.org, Masami Hiramatsu , Masami Hiramatsu , Peter Zijlstra , LKML , Alexei Starovoitov , bpf@vger.kernel.org, Steven Rostedt References: <20210128103415.d90be51ec607bb6123b2843c@kernel.org> <20210128123842.c9e33949e62f504b84bfadf5@gmail.com> <20210128165014.xc77qtun6fl2qfun@treble> <20210128215219.6kct3h2eiustncws@treble> <20210129102105.GA27841@zn.tnic> <20210129151034.iba4eaa2fuxsipqa@treble> <20210129163048.GD27841@zn.tnic> <20210129164932.qt7hhmb7x4ehomfr@treble> From: Nikolay Borisov Autocrypt: addr=nborisov@suse.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210129164932.qt7hhmb7x4ehomfr@treble> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 29.01.21 г. 18:49 ч., Josh Poimboeuf wrote: > Agreed, stable is a good idea. I think Nikolay saw it with GCC 9. Yes I did, with the default Ubuntu compiler as well as the default gcc-10 compiler: # gcc -v -Q -O2 --help=target | grep protection gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04) COLLECT_GCC_OPTIONS='-v' '-Q' '-O2' '--help=target' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/9/cc1 -v -imultiarch x86_64-linux-gnu help-dummy -dumpbase help-dummy -mtune=generic -march=x86-64 -auxbase help-dummy -O2 -version --help=target -fasynchronous-unwind-tables -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection -fcf-protection -o /tmp/ccSecttk.s GNU C17 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (x86_64-linux-gnu) compiled by GNU C version 9.3.0, GMP version 6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.22.1-GMP It has -fcf-protection turned on by default it seems.