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=-8.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 01F18C004E6 for ; Thu, 27 Jun 2019 20:20:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CD96C20828 for ; Thu, 27 Jun 2019 20:20:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="c4k6/Tjg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726484AbfF0UUb (ORCPT ); Thu, 27 Jun 2019 16:20:31 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:8048 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726443AbfF0UUb (ORCPT ); Thu, 27 Jun 2019 16:20:31 -0400 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5RKK8Pv006785 for ; Thu, 27 Jun 2019 13:20:30 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=XKJ6Yj46urGmUPHQW0EEETjfYj0CehU24b6YzaBJaxE=; b=c4k6/Tjg8hir1cvNokmg2jy/rOrbxZ12b8MtXtBLW00qhUB0FEF+WSlPtWcMju9gdiTY 7aCtOd0sTJzZdLl4GH7saoeDIShblCPt2ngfwTfumpo5MeA7EHWjm2Sk09DW8wWNwIQR E5gKdDFECsG4F4aj3O11jGS1Ht5K6hljVVk= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2tcynf1axg-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Thu, 27 Jun 2019 13:20:30 -0700 Received: from mx-out.facebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::129) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Thu, 27 Jun 2019 13:19:43 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 6CED162E2BE1; Thu, 27 Jun 2019 13:19:40 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig006.ftw2.facebook.com To: , CC: , , , , , , Song Liu Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v2 bpf-next 4/4] bpftool: use libbpf_[enable|disable]_sys_bpf() Date: Thu, 27 Jun 2019 13:19:23 -0700 Message-ID: <20190627201923.2589391-5-songliubraving@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190627201923.2589391-1-songliubraving@fb.com> References: <20190627201923.2589391-1-songliubraving@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-27_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=472 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906270233 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This patch calls libbpf_[enable|disable]_sys_bpf() from bpftool. This allows users with access to /dev/bpf to perform operations like root. Signed-off-by: Song Liu --- tools/bpf/bpftool/feature.c | 2 +- tools/bpf/bpftool/main.c | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c index d672d9086fff..772c9f445d34 100644 --- a/tools/bpf/bpftool/feature.c +++ b/tools/bpf/bpftool/feature.c @@ -583,7 +583,7 @@ static int do_probe(int argc, char **argv) /* Detection assumes user has sufficient privileges (CAP_SYS_ADMIN). * Let's approximate, and restrict usage to root user only. */ - if (geteuid()) { + if (!libbpf_enable_sys_bpf()) { p_err("please run this command as root user"); return -1; } diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c index 4879f6395c7e..56959c5ac552 100644 --- a/tools/bpf/bpftool/main.c +++ b/tools/bpf/bpftool/main.c @@ -390,6 +390,10 @@ int main(int argc, char **argv) if (argc < 0) usage(); + if (!libbpf_enable_sys_bpf()) { + p_err("cannot enable access to sys_bpf()"); + usage(); + } ret = cmd_select(cmds, argc, argv, do_help); if (json_output) @@ -400,5 +404,6 @@ int main(int argc, char **argv) delete_pinned_obj_table(&map_table); } + libbpf_disable_sys_bpf(); return ret; } -- 2.17.1