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=-15.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 7B230C76186 for ; Tue, 30 Jul 2019 02:56:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 485CC206DD for ; Tue, 30 Jul 2019 02:56:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564455418; bh=bFI5KJTUeQZlc54AIC7b3lrsr4PJHrBFtFL6n+6YkmU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jrA6ENhWHtMpVL2fG/E4s3xRlg91pvq0KIkVPuZoE5ey9K4CvOaGwJYihiqRh1Izf BO5cDRBCzFRYB/CfZUxp+OeZRTSh+z2zcY93IRH6Ar5LT+vLJ8T1G7v3K4ri2bmsTv W3z3He/26TkBN0g42MP/+GB/FgGaTpdUP7y+Lrx8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731656AbfG3C44 (ORCPT ); Mon, 29 Jul 2019 22:56:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:46480 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731631AbfG3C4x (ORCPT ); Mon, 29 Jul 2019 22:56:53 -0400 Received: from quaco.ghostprotocols.net (unknown [179.97.35.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8803E21773; Tue, 30 Jul 2019 02:56:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564455412; bh=bFI5KJTUeQZlc54AIC7b3lrsr4PJHrBFtFL6n+6YkmU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I3AxgSyxAHQh3sydkxvJ1D0nBkXZ4Lv/pHaFe67T6lbPF6Mfpy2CoMxHvfTXkBqM7 MGtV4cWm2p/rOGAEVpmSXhxpy8AkeGS7t0jYO5tz1aYnH71Mm6YHL6gvClCRyewS+p 1gYLDz38envVLu2Hn4XAnFTSX2hLY1u6o5h33CkI= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , Adrian Hunter , =?UTF-8?q?Luis=20Cl=C3=A1udio=20Gon=C3=A7alves?= Subject: [PATCH 011/107] perf augmented_raw_syscalls: Add handler for "openat" Date: Mon, 29 Jul 2019 23:54:34 -0300 Message-Id: <20190730025610.22603-12-acme@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190730025610.22603-1-acme@kernel.org> References: <20190730025610.22603-1-acme@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo I.e. for a syscall that has its second argument being a string, its difficult these days to find 'open' being used in the wild :-) Cc: Adrian Hunter Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-yf3kbzirqrukd3fb2sp5qx4p@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 1 + .../perf/examples/bpf/augmented_raw_syscalls.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 872c9cc982a5..a681b8c2ee4e 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -836,6 +836,7 @@ static struct syscall_fmt { .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, }, { .name = "openat", + .bpf_prog_name = { .sys_enter = "!syscalls:sys_enter_openat", }, .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, }, { .name = "perf_event_open", diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index c66474a6ccf4..661936f90fe0 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -131,6 +131,23 @@ int sys_enter_open(struct syscall_enter_args *args) return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, augmented_args, len); } +SEC("!syscalls:sys_enter_openat") +int sys_enter_openat(struct syscall_enter_args *args) +{ + int key = 0; + struct augmented_args_filename *augmented_args = bpf_map_lookup_elem(&augmented_filename_map, &key); + const void *filename_arg = (const void *)args->args[1]; + unsigned int len = sizeof(augmented_args->args); + + if (augmented_args == NULL) + return 1; /* Failure: don't filter */ + + len += augmented_filename__read(&augmented_args->filename, filename_arg, sizeof(augmented_args->filename.value)); + + /* If perf_event_output fails, return non-zero so that it gets recorded unaugmented */ + return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, augmented_args, len); +} + SEC("raw_syscalls:sys_enter") int sys_enter(struct syscall_enter_args *args) { -- 2.21.0