From patchwork Mon Dec 18 13:17:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 180419 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:24d3:b0:fb:cd0c:d3e with SMTP id r19csp1241233dyi; Mon, 18 Dec 2023 05:33:25 -0800 (PST) X-Google-Smtp-Source: AGHT+IHLmZ/91wJw1tpD2NcPutGnwzX3IocQ2WBi7DdnKh0TTsZqOUGh+qDtPYTg16Nlc9/Xy+ZZ X-Received: by 2002:a05:6a00:1c9b:b0:6d7:977e:f31d with SMTP id y27-20020a056a001c9b00b006d7977ef31dmr783394pfw.7.1702906405476; Mon, 18 Dec 2023 05:33:25 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1702906405; cv=none; d=google.com; s=arc-20160816; b=rNl7G2ijwvV/IJ45bjX4ziBRIHxSlMfBx44iHDRU+IV+hBloWL/kjt2YiWysilEfMB k6Md7NZbffHEljfZliHWVuW5iKCily+pSvBGMQxQlTH3buQiA8d3ci90bqYGR9fUY/ZU BWGp+FY1FcnpK27uU9xryqZPSL6lWjdiLeQnPwbs8pqRu+IujEc+S3Qf5NrOc4Iis1Jy agZh6Z3E2JhJ0IXUSneUybjeKDRPuGr79qs3C+NiwB0KXI4kVlhVaTnZSQG67Rnn47A7 9PgW1L3MLm1s7XrVGHot/Pc0r91a3sAgSYkE5atbLpW3NCx0mavSm/ACTE9CFvu2xYrA isvA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:user-agent:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature; bh=B+IimFdLV6G8hCJEMsVcQeurP5etXlmAnEIlOhkzF3g=; fh=SIgps5XdV0XNwjZfT2uAI7g3mrspDldK9Qs8qQAfoa4=; b=nlsulzihJeOn9/R/p4is3RWj4AutRQ1MLLfuoylHz7Rv71hu8pWUrllCy0U3NEh9rA Iuu8IF7bmrrHz2wxe7aYAibfEcelwReAVTgWq2qPMNNgb3lw1y9spPjWLPTpTcud/OYS Fss/44CYY4V2lmQml5rka2MLwaRsuQ+GnnhW2h6Vi86YeTHa7xnvxsVM8zx293U8suWe PQDtG5ef+lNeDuZhS/XyDXCwU3lmf+dq3t745L6NISr9GJEkyZiDaCKzVAERpxbgNyR5 Jbwr7s7/b8NbtWEnAYLX2dv32aGjgpQ0u2PF6LVaqFmVtGRbfYTcEdiur8wvo5+Kknm0 qTBg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=LeiJZhzd; spf=pass (google.com: domain of linux-kernel+bounces-3738-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-3738-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. [2604:1380:40f1:3f00::1]) by mx.google.com with ESMTPS id f9-20020a654009000000b00578c64433d5si16969849pgp.877.2023.12.18.05.33.25 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Dec 2023 05:33:25 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-3738-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=LeiJZhzd; spf=pass (google.com: domain of linux-kernel+bounces-3738-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-3738-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sy.mirrors.kernel.org (Postfix) with ESMTPS id EA65DB23A35 for ; Mon, 18 Dec 2023 13:26:11 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7B45C5BFA4; Mon, 18 Dec 2023 13:17:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LeiJZhzd" X-Original-To: linux-kernel@vger.kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE1B05BF99; Mon, 18 Dec 2023 13:17:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7375BC433C8; Mon, 18 Dec 2023 13:17:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702905473; bh=uaiQ0NlnGDpVimzHf7hc4bouD6LM9m4Fjq8sHDW6itc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LeiJZhzdZ+Vkly6pi4nXcOQTenffS1Ylrd10bBNSluPRXzr6O0kXJ0zsxS9ikhBOp eJocFIJ3p42lIE9n6a0h2/3teG4xH3wDGVqnZMfBKcIGDXdpvEX45eZCGWmsCC0CTN B/CLk3tO9y48V0UMeuyiH/shvF7TwrZJWrCM644ZDvyJUxDnHTxl34fKJW7fXsQ36v gbi6h42RKoIQmDfLusYAIxKVpCAMVuGMkE0ks6ucwmpG3sIog3whvpOWGp5eVvVB/n y3O/S/nSHPs3CFW0cWZQZRj4vkP1wNwEKJo4jYbWzrcBZpEoRwxPm5fF1dQ7cirlxK ZMKp6bdWYnnYw== From: "Masami Hiramatsu (Google)" To: Alexei Starovoitov , Steven Rostedt , Florent Revest Cc: linux-trace-kernel@vger.kernel.org, LKML , Martin KaFai Lau , bpf , Sven Schnelle , Alexei Starovoitov , Jiri Olsa , Arnaldo Carvalho de Melo , Daniel Borkmann , Alan Maguire , Mark Rutland , Peter Zijlstra , Thomas Gleixner , Guo Ren Subject: [PATCH v5 31/34] bpf: Enable kprobe_multi feature if CONFIG_FPROBE is enabled Date: Mon, 18 Dec 2023 22:17:47 +0900 Message-Id: <170290546656.220107.4705582913827924737.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <170290509018.220107.1347127510564358608.stgit@devnote2> References: <170290509018.220107.1347127510564358608.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785626787177113344 X-GMAIL-MSGID: 1785626787177113344 From: Masami Hiramatsu (Google) Enable kprobe_multi feature if CONFIG_FPROBE is enabled. The pt_regs is converted from ftrace_regs by ftrace_partial_regs(), thus some registers may always returns 0. But it should be enough for function entry (access arguments) and exit (access return value). Signed-off-by: Masami Hiramatsu (Google) Acked-by: Florent Revest --- Changes from previous series: NOTHING, Update against the new series. --- kernel/trace/bpf_trace.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index efb792f8f2ea..24ee4e960f1d 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2503,7 +2503,7 @@ static int __init bpf_event_init(void) fs_initcall(bpf_event_init); #endif /* CONFIG_MODULES */ -#if defined(CONFIG_FPROBE) && defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) +#ifdef CONFIG_FPROBE struct bpf_kprobe_multi_link { struct bpf_link link; struct fprobe fp; @@ -2526,6 +2526,8 @@ struct user_syms { char *buf; }; +static DEFINE_PER_CPU(struct pt_regs, bpf_kprobe_multi_pt_regs); + static int copy_user_syms(struct user_syms *us, unsigned long __user *usyms, u32 cnt) { unsigned long __user usymbol; @@ -2703,13 +2705,14 @@ static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) static int kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, - unsigned long entry_ip, struct pt_regs *regs) + unsigned long entry_ip, struct ftrace_regs *fregs) { struct bpf_kprobe_multi_run_ctx run_ctx = { .link = link, .entry_ip = entry_ip, }; struct bpf_run_ctx *old_run_ctx; + struct pt_regs *regs; int err; if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { @@ -2720,6 +2723,7 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, migrate_disable(); rcu_read_lock(); + regs = ftrace_partial_regs(fregs, this_cpu_ptr(&bpf_kprobe_multi_pt_regs)); old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); err = bpf_prog_run(link->link.prog, regs); bpf_reset_run_ctx(old_run_ctx); @@ -2737,13 +2741,9 @@ kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, void *data) { struct bpf_kprobe_multi_link *link; - struct pt_regs *regs = ftrace_get_regs(fregs); - - if (!regs) - return 0; link = container_of(fp, struct bpf_kprobe_multi_link, fp); - kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs); + kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), fregs); return 0; } @@ -2753,13 +2753,9 @@ kprobe_multi_link_exit_handler(struct fprobe *fp, unsigned long fentry_ip, void *data) { struct bpf_kprobe_multi_link *link; - struct pt_regs *regs = ftrace_get_regs(fregs); - - if (!regs) - return; link = container_of(fp, struct bpf_kprobe_multi_link, fp); - kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs); + kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), fregs); } static int symbols_cmp_r(const void *a, const void *b, const void *priv) @@ -3016,7 +3012,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr kvfree(cookies); return err; } -#else /* !CONFIG_FPROBE || !CONFIG_DYNAMIC_FTRACE_WITH_REGS */ +#else /* !CONFIG_FPROBE */ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) { return -EOPNOTSUPP;