From patchwork Tue Jul 12 18:41:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12915426 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 F25EDCCA483 for ; Tue, 12 Jul 2022 18:47:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234469AbiGLSrx (ORCPT ); Tue, 12 Jul 2022 14:47:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46000 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234368AbiGLSr0 (ORCPT ); Tue, 12 Jul 2022 14:47:26 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D633BFAFE; Tue, 12 Jul 2022 11:43:15 -0700 (PDT) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Lj8jh4cQjz689sp; Wed, 13 Jul 2022 02:41:44 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 12 Jul 2022 20:43:06 +0200 From: Roberto Sassu To: , , , , , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v7 6/7] selftests/bpf: Add additional test for bpf_lookup_user_key() Date: Tue, 12 Jul 2022 20:41:27 +0200 Message-ID: <20220712184128.999301-7-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220712184128.999301-1-roberto.sassu@huawei.com> References: <20220712184128.999301-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add an additional test to ensure that bpf_lookup_user_key() creates a referenced special keyring when the KEY_LOOKUP_CREATE flag is passed to this function. Also ensure that the helper rejects invalid flags. Signed-off-by: Roberto Sassu --- .../bpf/prog_tests/lookup_user_key.c | 94 +++++++++++++++++++ .../bpf/progs/test_lookup_user_key.c | 35 +++++++ 2 files changed, 129 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/lookup_user_key.c create mode 100644 tools/testing/selftests/bpf/progs/test_lookup_user_key.c diff --git a/tools/testing/selftests/bpf/prog_tests/lookup_user_key.c b/tools/testing/selftests/bpf/prog_tests/lookup_user_key.c new file mode 100644 index 000000000000..6487699d30f6 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/lookup_user_key.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright (C) 2022 Huawei Technologies Duesseldorf GmbH + * + * Author: Roberto Sassu + */ + +#include +#include + +#include "test_lookup_user_key.skel.h" + +#define LOG_BUF_SIZE 16384 + +#define KEY_LOOKUP_CREATE 0x01 +#define KEY_LOOKUP_PARTIAL 0x02 + +void test_lookup_user_key(void) +{ + char *buf = NULL; + struct test_lookup_user_key *skel = NULL; + u32 next_id; + int ret; + + LIBBPF_OPTS(bpf_object_open_opts, opts); + + buf = malloc(LOG_BUF_SIZE); + if (!ASSERT_OK_PTR(buf, "malloc")) + goto close_prog; + + opts.kernel_log_buf = buf; + opts.kernel_log_size = LOG_BUF_SIZE; + opts.kernel_log_level = 1; + + skel = test_lookup_user_key__open_opts(&opts); + if (!ASSERT_OK_PTR(skel, "test_lookup_user_key__open_opts")) + goto close_prog; + + ret = test_lookup_user_key__load(skel); + + if (ret < 0 && strstr(buf, "unknown func bpf_lookup_user_key")) { + printf("%s:SKIP:bpf_lookup_user_key() helper not supported\n", + __func__); + test__skip(); + goto close_prog; + } + + if (!ASSERT_OK(ret, "test_lookup_user_key__load")) + goto close_prog; + + ret = test_lookup_user_key__attach(skel); + if (!ASSERT_OK(ret, "test_lookup_user_key__attach")) + goto close_prog; + + skel->bss->monitored_pid = getpid(); + skel->bss->key_serial = KEY_SPEC_THREAD_KEYRING; + + /* The thread-specific keyring does not exist, this test fails. */ + skel->bss->flags = 0; + + ret = bpf_prog_get_next_id(0, &next_id); + if (!ASSERT_LT(ret, 0, "bpf_prog_get_next_id")) + goto close_prog; + + /* Force creation of the thread-specific keyring, this test succeeds. */ + skel->bss->flags = KEY_LOOKUP_CREATE; + + ret = bpf_prog_get_next_id(0, &next_id); + if (!ASSERT_OK(ret, "bpf_prog_get_next_id")) + goto close_prog; + + /* Pass both lookup flags for parameter validation. */ + skel->bss->flags = KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL; + + ret = bpf_prog_get_next_id(0, &next_id); + if (!ASSERT_OK(ret, "bpf_prog_get_next_id")) + goto close_prog; + + /* Pass invalid flags. */ + skel->bss->flags = UINT64_MAX; + + ret = bpf_prog_get_next_id(0, &next_id); + ASSERT_LT(ret, 0, "bpf_prog_get_next_id"); + +close_prog: + free(buf); + + if (!skel) + return; + + skel->bss->monitored_pid = 0; + test_lookup_user_key__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_lookup_user_key.c b/tools/testing/selftests/bpf/progs/test_lookup_user_key.c new file mode 100644 index 000000000000..5b63753ba163 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_lookup_user_key.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright (C) 2022 Huawei Technologies Duesseldorf GmbH + * + * Author: Roberto Sassu + */ + +#include +#include +#include +#include + +char _license[] SEC("license") = "GPL"; + +__u32 monitored_pid; +__u32 key_serial; +__u64 flags; + +SEC("lsm.s/bpf") +int BPF_PROG(bpf, int cmd, union bpf_attr *attr, unsigned int size) +{ + struct key *key; + __u32 pid; + + pid = bpf_get_current_pid_tgid() >> 32; + if (pid != monitored_pid) + return 0; + + key = bpf_lookup_user_key(key_serial, flags); + if (key) + bpf_key_put(key); + + return (key) ? 0 : -ENOENT; +}