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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 47104C433E6 for ; Fri, 29 Jan 2021 06:37:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0DEDB64DFF for ; Fri, 29 Jan 2021 06:37:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232054AbhA2Gh0 (ORCPT ); Fri, 29 Jan 2021 01:37:26 -0500 Received: from mx2.suse.de ([195.135.220.15]:49918 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232101AbhA2GhT (ORCPT ); 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210129013452.njuh3fomws62m4rc@ast-mbp.dhcp.thefacebook.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On 29.01.21 г. 3:34 ч., Alexei Starovoitov wrote: > On Thu, Jan 28, 2021 at 07:24:14PM +0100, Peter Zijlstra wrote: >> On Thu, Jan 28, 2021 at 06:45:56PM +0200, Nikolay Borisov wrote: >>> it would be placed on the __fentry__ (and not endbr64) hence it works. >>> So perhaps a workaround outside of bpf could essentially detect this >>> scenario and adjust the probe to be on the __fentry__ and not preceding >>> instruction if it's detected to be endbr64 ? >> >> Arguably the fentry handler should also set the nmi context, it can, >> after all, interrupt pretty much any other context by construction. > > But that doesn't make it a real nmi. > nmi can actually interrupt anything. Whereas kprobe via int3 cannot > do nokprobe and noinstr sections. The exposure is a lot different. > ftrace is even more contained. It's only at the start of the functions. > It's even smaller subset of places than kprobes. > So ftrace < kprobe < nmi. > Grouping them all into nmi doesn't make sense to me. > That bpf breaking change came unnoticed mostly because people use > kprobes in the beginning of the functions only, but there are cases > where kprobes are in the middle too. People just didn't upgrade kernels > fast enough to notice. nit: slight correction - I observed while I was putting kprobes at the beginning of the function but __fentry__ wasn't the first thing in the function's code. The reason why people haven't observed is because everyone is running with retpolines enabled which disables CFI/CET. > imo appropriate solution would be to have some distinction between > ftrace < kprobe_via_int3 < nmi, so that bpf side can react accordingly. > That code in trace_call_bpf: > if (in_nmi()) /* not supported yet */ > was necessary in the past. Now we have all sorts of protections built in. > So it's probably ok to just drop it, but I think adding > called_via_ftrace vs called_via_kprobe_int3 vs called_via_nmi > is more appropriate solution long term. >