From patchwork Fri Jun 2 15:00:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 13265466 X-Patchwork-Delegate: paul@paul-moore.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD48EC77B7A for ; Fri, 2 Jun 2023 15:01:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236331AbjFBPBi convert rfc822-to-8bit (ORCPT ); Fri, 2 Jun 2023 11:01:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236373AbjFBPBI (ORCPT ); Fri, 2 Jun 2023 11:01:08 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6768E4D for ; Fri, 2 Jun 2023 08:01:07 -0700 (PDT) Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.17.1.19/8.17.1.19) with ESMTP id 3527V8DL028611 for ; Fri, 2 Jun 2023 08:01:07 -0700 Received: from maileast.thefacebook.com ([163.114.130.16]) by m0001303.ppops.net (PPS) with ESMTPS id 3qyc3papkt-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 02 Jun 2023 08:01:06 -0700 Received: from twshared25760.37.frc1.facebook.com (2620:10d:c0a8:1c::11) by mail.thefacebook.com (2620:10d:c0a8:82::d) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Fri, 2 Jun 2023 08:00:39 -0700 Received: by devbig019.vll3.facebook.com (Postfix, from userid 137359) id 969CD31E04936; Fri, 2 Jun 2023 08:00:30 -0700 (PDT) From: Andrii Nakryiko To: CC: , , , , , Subject: [PATCH RESEND bpf-next 09/18] selftests/bpf: add BPF token-enabled test for BPF_MAP_CREATE command Date: Fri, 2 Jun 2023 08:00:02 -0700 Message-ID: <20230602150011.1657856-10-andrii@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230602150011.1657856-1-andrii@kernel.org> References: <20230602150011.1657856-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: gA7s-O4J64iwI_62hJ9py3NHh4dQV9EN X-Proofpoint-ORIG-GUID: gA7s-O4J64iwI_62hJ9py3NHh4dQV9EN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-02_11,2023-06-02_02,2023-05-22_02 Precedence: bulk List-ID: Add test for creating BPF token with support for BPF_MAP_CREATE delegation. And validate that its allowed_map_types filter works as expected and allows to create privileged BPF maps through delegated token, as long as they are allowed by privileged creator of a token. Signed-off-by: Andrii Nakryiko --- .../testing/selftests/bpf/prog_tests/token.c | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/token.c b/tools/testing/selftests/bpf/prog_tests/token.c index fe78b558d697..0b6e699d2439 100644 --- a/tools/testing/selftests/bpf/prog_tests/token.c +++ b/tools/testing/selftests/bpf/prog_tests/token.c @@ -88,8 +88,60 @@ static void subtest_token_create(void) ASSERT_OK(restore_priv_caps(old_caps), "restore_caps"); } +static void subtest_map_token(void) +{ + LIBBPF_OPTS(bpf_token_create_opts, token_opts); + LIBBPF_OPTS(bpf_map_create_opts, map_opts); + int token_fd = 0, map_fd = 0; + __u64 old_caps = 0; + + /* check that IGNORE_UNKNOWN_MAP_TYPES flag is respected */ + token_opts.flags = BPF_F_TOKEN_IGNORE_UNKNOWN_MAP_TYPES; + token_opts.allowed_map_types = ~0ULL; /* any current and future map types is allowed */ + token_fd = bpf_token_create(&token_opts); + if (!ASSERT_GT(token_fd, 0, "token_create_future_proof")) + return; + close(token_fd); + + /* create BPF token allowing STACK, but not QUEUE map */ + token_opts.flags = 0; + token_opts.allowed_cmds = 1ULL << BPF_MAP_CREATE; + token_opts.allowed_map_types = 1ULL << BPF_MAP_TYPE_STACK; /* but not QUEUE */ + token_fd = bpf_token_create(&token_opts); + if (!ASSERT_GT(token_fd, 0, "token_create")) + return; + + /* drop privileges to test token_fd passing */ + if (!ASSERT_OK(drop_priv_caps(&old_caps), "drop_caps")) + goto cleanup; + + /* BPF_MAP_TYPE_STACK is privileged, but with given token_fd should succeed */ + map_opts.token_fd = token_fd; + map_fd = bpf_map_create(BPF_MAP_TYPE_STACK, "token_stack", 0, 8, 1, &map_opts); + if (!ASSERT_GT(map_fd, 0, "stack_map_fd")) + goto cleanup; + close(map_fd); + map_fd = 0; + + /* BPF_MAP_TYPE_QUEUE is privileged, and token doesn't allow it, so should fail */ + map_opts.token_fd = token_fd; + map_fd = bpf_map_create(BPF_MAP_TYPE_QUEUE, "token_queue", 0, 8, 1, &map_opts); + if (!ASSERT_EQ(map_fd, -EPERM, "queue_map_fd")) + goto cleanup; + +cleanup: + if (map_fd > 0) + close(map_fd); + if (token_fd) + close(token_fd); + if (old_caps) + ASSERT_OK(restore_priv_caps(old_caps), "restore_caps"); +} + void test_token(void) { if (test__start_subtest("token_create")) subtest_token_create(); + if (test__start_subtest("map_token")) + subtest_map_token(); }