From patchwork Wed Dec 18 17:38:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlos Antonio Neira Bustos X-Patchwork-Id: 1212647 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="cQJeSggR"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47dMgZ0Lrfz9sRC for ; Thu, 19 Dec 2019 04:38:50 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727063AbfLRRit (ORCPT ); Wed, 18 Dec 2019 12:38:49 -0500 Received: from mail-pf1-f194.google.com ([209.85.210.194]:45241 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727031AbfLRRit (ORCPT ); Wed, 18 Dec 2019 12:38:49 -0500 Received: by mail-pf1-f194.google.com with SMTP id 2so1579894pfg.12; Wed, 18 Dec 2019 09:38:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ll2XUGPtS1DGsRu7y7Hq5A+fQ0XX0UH+KolA2vHqi/U=; b=cQJeSggR70rBCXPHqVoivz6FWxkUplAQr+SqV+arKhXzuKM4fGvn4B/lGHAQhcwudD /jEb+ujVMCXNPggqifD/0V9c28UuoZ2h9oDGOHH9N2IVQoJ0sBUax2DF7JTfT2WVrDjD SFY0JvV5ZoFUvTx4eUuMocrwoWF2Mk+RR0LPX4j8+w+E4c3XqxI0IbryVBTvyXJlNBNG 6zJRmq9kNgY4rCD/Qrl2K+lwTAZm9XBMt/dvb3uMMeovTwj9cQAxdFiEIqgnzt9hFi9f E6shDb7ZEeHcC8WKt6ru/n6MVQFH7x4hbqZPRr/7IhAu8J92d2CRnstTc4/0FYYKKMaI Jvxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ll2XUGPtS1DGsRu7y7Hq5A+fQ0XX0UH+KolA2vHqi/U=; b=Nfst4mKUg3lFqkgdH6C+ssEtzi1+oR4TYYXgZDPWFlgWNfN/hf4Yrfby3FqMWWSCpP 3GiPEhMpUvbxAOg0hUnttt2fs5p6VfY8Pp25cZMaxEElfGxVpB/j8x5ErtETKYu89nf9 i/MIEiKbPvEGHCK3VZZTGlLkOGWiuuQBTzie/+Sd4xnWsF4onYB8M7AsIrHWObINN/Gl i61JbUKDFTCFheyA+ENRCMUnumGXapeCZa8jluymFjEzXfseBbEer3SprMw2N0eJUfHD cJzFWb21ldbCwVZa3BrepcCoHqbe5ItCN5GhHcTZ8inj20jAseFu+yDpiTyeMG9TFMa8 h0bA== X-Gm-Message-State: APjAAAWT6y7RyfzKLPPCOeUL7iHDB5198oXu94KqDuStXzeon3W8/vQK E869PjJyZqta+mfFtZnxcFApJhAgsNc= X-Google-Smtp-Source: APXvYqz0F5JLI7Oy7llKdrzKPfe4F8ftkLar9M2Ik5iTZ1b1j+EWhOtydPE4o3FoaCLGwbBiuj7wEg== X-Received: by 2002:a62:aa09:: with SMTP id e9mr4342927pff.154.1576690727770; Wed, 18 Dec 2019 09:38:47 -0800 (PST) Received: from bpf-kern-dev.byteswizards.com (pc-184-104-160-190.cm.vtr.net. [190.160.104.184]) by smtp.googlemail.com with ESMTPSA id s15sm3991925pgq.4.2019.12.18.09.38.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2019 09:38:47 -0800 (PST) From: Carlos Neira To: netdev@vger.kernel.org Cc: yhs@fb.com, ebiederm@xmission.com, brouer@redhat.com, bpf@vger.kernel.org, cneirabustos@gmail.com Subject: [PATCH v16 4/5] tools/testing/selftests/bpf: Add self-tests for new helper bpf_get_ns_current_pid_tgid. Date: Wed, 18 Dec 2019 14:38:26 -0300 Message-Id: <20191218173827.20584-5-cneirabustos@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191218173827.20584-1-cneirabustos@gmail.com> References: <20191218173827.20584-1-cneirabustos@gmail.com> MIME-Version: 1.0 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Self tests added for new helper bpf_get_ns_current_pid_tgid Signed-off-by: Carlos Neira Acked-by: Yonghong Song --- .../bpf/prog_tests/ns_current_pid_tgid.c | 88 +++++++++++++++++++ .../bpf/progs/test_ns_current_pid_tgid.c | 37 ++++++++ 2 files changed, 125 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c create mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c diff --git a/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c new file mode 100644 index 000000000000..afd4a19dda14 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 Carlos Neira cneirabustos@gmail.com */ +#include +#include +#include +#include +#include + +struct bss { + __u64 dev; + __u64 ino; + __u64 pid_tgid; + __u64 user_pid_tgid; +}; + +void test_ns_current_pid_tgid(void) +{ + const char *probe_name = "raw_tracepoint/sys_enter"; + const char *file = "test_ns_current_pid_tgid.o"; + int err, key = 0, duration = 0; + struct bpf_link *link = NULL; + struct bpf_program *prog; + struct bpf_map *bss_map; + struct bpf_object *obj; + struct bss bss; + struct stat st; + __u64 id; + + obj = bpf_object__open_file(file, NULL); + if (CHECK(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj))) + return; + + err = bpf_object__load(obj); + if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno)) + goto cleanup; + + bss_map = bpf_object__find_map_by_name(obj, "test_ns_.bss"); + if (CHECK(!bss_map, "find_bss_map", "failed\n")) + goto cleanup; + + prog = bpf_object__find_program_by_title(obj, probe_name); + if (CHECK(!prog, "find_prog", "prog '%s' not found\n", + probe_name)) + goto cleanup; + + memset(&bss, 0, sizeof(bss)); + pid_t tid = syscall(SYS_gettid); + pid_t pid = getpid(); + + id = (__u64) tid << 32 | pid; + bss.user_pid_tgid = id; + + if (CHECK_FAIL(stat("/proc/self/ns/pid", &st))) { + perror("Failed to stat /proc/self/ns/pid"); + goto cleanup; + } + + bss.dev = st.st_dev; + bss.ino = st.st_ino; + + err = bpf_map_update_elem(bpf_map__fd(bss_map), &key, &bss, 0); + if (CHECK(err, "setting_bss", "failed to set bss : %d\n", err)) + goto cleanup; + + link = bpf_program__attach_raw_tracepoint(prog, "sys_enter"); + if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", + PTR_ERR(link))) { + link = NULL; + goto cleanup; + } + + /* trigger some syscalls */ + usleep(1); + + err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &key, &bss); + if (CHECK(err, "set_bss", "failed to get bss : %d\n", err)) + goto cleanup; + + if (CHECK(id != bss.pid_tgid, "Compare user pid/tgid vs. bpf pid/tgid", + "User pid/tgid %llu BPF pid/tgid %llu\n", id, bss.pid_tgid)) + goto cleanup; +cleanup: + if (!link) { + bpf_link__destroy(link); + link = NULL; + } + bpf_object__close(obj); +} diff --git a/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c b/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c new file mode 100644 index 000000000000..cdb77eb1a4fb --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 Carlos Neira cneirabustos@gmail.com */ + +#include +#include +#include "bpf_helpers.h" + +static volatile struct { + __u64 dev; + __u64 ino; + __u64 pid_tgid; + __u64 user_pid_tgid; +} res; + +SEC("raw_tracepoint/sys_enter") +int trace(void *ctx) +{ + __u64 ns_pid_tgid, expected_pid; + struct bpf_pidns_info nsdata; + __u32 key = 0; + + if (bpf_get_ns_current_pid_tgid(res.dev, res.ino, &nsdata, + sizeof(struct bpf_pidns_info))) + return 0; + + ns_pid_tgid = (__u64)nsdata.tgid << 32 | nsdata.pid; + expected_pid = res.user_pid_tgid; + + if (expected_pid != ns_pid_tgid) + return 0; + + res.pid_tgid = ns_pid_tgid; + + return 0; +} + +char _license[] SEC("license") = "GPL";