From patchwork Thu Apr 20 07:26:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Feng Zhou X-Patchwork-Id: 13218027 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 C4671C77B73 for ; Thu, 20 Apr 2023 07:27:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234067AbjDTH1f (ORCPT ); Thu, 20 Apr 2023 03:27:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40774 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234068AbjDTH12 (ORCPT ); Thu, 20 Apr 2023 03:27:28 -0400 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 160914EEC for ; Thu, 20 Apr 2023 00:27:27 -0700 (PDT) Received: by mail-pl1-x631.google.com with SMTP id d9443c01a7336-1a66b9bd893so7586965ad.1 for ; Thu, 20 Apr 2023 00:27:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1681975646; x=1684567646; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KY6KaCFZ5vdzzIXTUyV6D8NEGya8RvpCjdxKUFkIlbo=; b=JdpK091tQZhcpVQCrGmT53jyzk0tdpPMrMjsOt2nhOO6VvJm4CHj6b3MGcEtFPjrmj jRNPw5HUcEZWIJGHvsLxe344JI6DV18Gtby29KPcbI49o3qCSmqB71Eg+4RPCbqs4iPm v3YHKLR5mv2ycE2z5Uzvthf87ASaR/OaOaKaMkZbPpGN/o1brGSdxKSc6IochSv6/AbZ gDpcAdKFTBC8fGCg660IDSJI/tyA2ywbL5RjXTgpq/uufdxPrCODT/WuDOdKNukitBLv z7znofi2TQ82y2kjpWhFiI7HRNVKU1n6s9umJI6PADeGkDWPZdOKeULaonHTZo5nIUD8 LGig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681975646; x=1684567646; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=KY6KaCFZ5vdzzIXTUyV6D8NEGya8RvpCjdxKUFkIlbo=; b=cQtEVdGOaAbvxyIkfnSKPRVGZf7CfO7072r1BCrMa0fmMoxHQg0CR+JdL4wd/j6paN wjt8ca3/QV3B6D2GhQstpmyNZj4EUZV8yHayg3rRdsTARDmJl14XlR8N6PnvVF6liYBD hmflyYHZHk6hq9j27h5By8/iU6Abel1luWFsGiT5UbrAopQ4SyNlrbCVjF1VYmclIRHk NZ4BKnHqDT4zYthmb3M+EC6OGoRVB425mSn7VPHEpV737R7HPx9b4A+uWp8CVQtvXLyv 593aKq09fzlvClo2Rn6LpW6t1mxtvluYEIe13s7EEWqy++yCpwunzv43YOg0jGPUvl+5 DbAQ== X-Gm-Message-State: AAQBX9fvAO5lD9JpVKn4hfLIslcjwDlQ4tMluNuF3k8VrjLg4Gv5N+M3 ASF7gqe7Q6rU9ZS+fCSE+4lFTA== X-Google-Smtp-Source: AKy350Zh/YeQnWj7L0LszMWL1n63Iez1x6ZInscmr5n73w2GM1PRAMnrQpIboMm8xj558lZf9TY4Gg== X-Received: by 2002:a17:90a:d381:b0:249:7958:ea36 with SMTP id q1-20020a17090ad38100b002497958ea36mr847077pju.19.1681975646451; Thu, 20 Apr 2023 00:27:26 -0700 (PDT) Received: from C02F52LSML85.bytedance.net ([139.177.225.238]) by smtp.gmail.com with ESMTPSA id y18-20020a17090ad71200b0023440af7aafsm612160pju.9.2023.04.20.00.27.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Apr 2023 00:27:26 -0700 (PDT) From: Feng zhou To: martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com, shuah@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, yangzhenze@bytedance.com, wangdongdong.6@bytedance.com, zhoufeng.zf@bytedance.com Subject: [PATCH bpf-next 2/2] selftests/bpf: Add testcase for bpf_task_under_cgroup Date: Thu, 20 Apr 2023 15:26:57 +0800 Message-Id: <20230420072657.80324-3-zhoufeng.zf@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20230420072657.80324-1-zhoufeng.zf@bytedance.com> References: <20230420072657.80324-1-zhoufeng.zf@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Feng Zhou test_progs: Tests new ebpf helpers bpf_task_under_cgroup. The bpf program saves the pid which call the getuid syscall within a given cgroup to a map to the remote_pid, which is convenient for the user-mode program to verify the test correctness. The user-mode program creates its own mount namespace, and mounts the cgroupsv2 hierarchy in there, call the getuid syscall, then check if remote_pid and local_pid are equal. Signed-off-by: Feng Zhou --- .../bpf/prog_tests/task_under_cgroup.c | 49 +++++++++++++++++++ .../bpf/progs/test_task_under_cgroup.c | 31 ++++++++++++ 2 files changed, 80 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c create mode 100644 tools/testing/selftests/bpf/progs/test_task_under_cgroup.c diff --git a/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c b/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c new file mode 100644 index 000000000000..4dd704b11a95 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Bytedance */ + +#include +#include "test_task_under_cgroup.skel.h" + +#define FOO "/foo" + +void test_task_under_cgroup(void) +{ + struct test_task_under_cgroup *skel; + int ret, foo = -1, idx = 0; + + skel = test_task_under_cgroup__open(); + if (!ASSERT_OK_PTR(skel, "test_task_under_cgroup__open")) + return; + + skel->rodata->local_pid = getpid(); + + ret = test_task_under_cgroup__load(skel); + if (!ASSERT_OK(ret, "test_task_under_cgroup__load")) + goto cleanup; + + ret = test_task_under_cgroup__attach(skel); + if (!ASSERT_OK(ret, "test_task_under_cgroup__attach")) + goto cleanup; + + foo = test__join_cgroup(FOO); + if (!ASSERT_OK(foo < 0, "cgroup_join_foo")) + goto cleanup; + + ret = bpf_map_update_elem(bpf_map__fd(skel->maps.cgroup_map), &idx, + &foo, BPF_ANY); + if (!ASSERT_OK(ret < 0, "cgroup_map update")) + goto cleanup; + + syscall(__NR_getuid); + + test_task_under_cgroup__detach(skel); + + ASSERT_EQ(skel->bss->remote_pid, skel->rodata->local_pid, + "test task_under_cgroup"); + +cleanup: + if (foo) + close(foo); + + test_task_under_cgroup__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_task_under_cgroup.c b/tools/testing/selftests/bpf/progs/test_task_under_cgroup.c new file mode 100644 index 000000000000..0f3d53f636de --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_task_under_cgroup.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Bytedance */ + +#include "vmlinux.h" +#include + +const volatile int local_pid; +int remote_pid; + +struct { + __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); + __uint(max_entries, 1); + __type(key, __u32); + __type(value, __u32); +} cgroup_map SEC(".maps"); + +SEC("tp/syscalls/sys_enter_getuid") +int sysenter_getuid(const void *ctx) +{ + if (local_pid != (bpf_get_current_pid_tgid() >> 32)) + return 0; + + if (!bpf_task_under_cgroup(&cgroup_map, bpf_get_current_task_btf(), 0)) + return 0; + + remote_pid = local_pid; + + return 0; +} + +char _license[] SEC("license") = "GPL";