From patchwork Fri Apr 21 09:04:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Feng Zhou X-Patchwork-Id: 13219651 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 24AE2C77B75 for ; Fri, 21 Apr 2023 09:06:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231684AbjDUJGW (ORCPT ); Fri, 21 Apr 2023 05:06:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231717AbjDUJGO (ORCPT ); Fri, 21 Apr 2023 05:06:14 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73FFD6EB6 for ; Fri, 21 Apr 2023 02:05:47 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id 98e67ed59e1d1-246fa478d45so1713790a91.3 for ; Fri, 21 Apr 2023 02:05:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1682067947; x=1684659947; 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=t0gJQV+jBsuJN+dqapwDGx8wuqSDbN1mALWddpdSsEk=; b=S5Ivxp968YSA3NDLM8BeS1NCb2DfvXA3IuISPyCNzeNTePZMImiqO1QFMplQ3aXvDz /JvtVHFnfcDqRSLbbaCRYizZ6eVphwrfwkjJf7dk2xAGd6ln9qyu2KFaV5fIQGQLEGbh UFTjg240tmdYVaKwG8OZ6gX0sCfvi3mqh0IFgjtv3fmK0Ctvild8XBJs1iZoKvJFwu54 qQqD2rnDRafbasd6xUreABRj/ccs0fL2FTpiONAYRciJzBzv3/2xzI1k/ZZ/gFwxgUY5 HePnsiegALfcpVVlCX9aIdraq+Dy+PNzgb9CdkwgZPAqjAbqksx1axNBgTMMnjnnUNXn zPMg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682067947; x=1684659947; 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=t0gJQV+jBsuJN+dqapwDGx8wuqSDbN1mALWddpdSsEk=; b=OELWq9AmZRvN7CvX9H31OH0KH619alDfMckyB3m1Iyv9fvyXECywIzwrdgIS78jSO8 hcwkSW99op9A1lKwFfVW3Ifizx0oz7/Pgg4/pajecvA5HlayQv+U54H6iHKzNC9vysGO aBIMgX5RKw5q/clfJNiauv6fUVKqnjB5zso4Zm5c5yQHt1sfSnpb7jwgvkk0Pf6oRfZa yaqrwPDtELwP+Kw2ooXPm+PLvpujtr8SVllpAZ6IS7n6kv2WLoCWntpTLWAuNPg2KjEY ruExG+xRUiNanslGUI9eBT+RVkYWTmkmtwLDne9ZcVEiN6uDLKkFcfAKwmf4aHYuTr67 bR/g== X-Gm-Message-State: AAQBX9cMH1aF27x9awh+upmJh4U/3Xssjoa2mUCRTB66ArZvty5LTg/c 15UazuD6178LI2MLIO2fRDYAMzz+5EoI1MzZdi3ZDg== X-Google-Smtp-Source: AKy350Yq/tolYlOhf1pDRg+pi8crdvgzu8tht/po/DMcygONgBqFFU6dDpp2J5xJKwIpk+nmGlNlMw== X-Received: by 2002:a17:90a:3004:b0:246:681c:71fd with SMTP id g4-20020a17090a300400b00246681c71fdmr4294867pjb.6.1682067946936; Fri, 21 Apr 2023 02:05:46 -0700 (PDT) Received: from C02F52LSML85.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id t3-20020a17090a950300b0024796ddd19bsm4192309pjo.7.2023.04.21.02.05.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Apr 2023 02:05:46 -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 v2 2/2] selftests/bpf: Add testcase for bpf_task_under_cgroup Date: Fri, 21 Apr 2023 17:04:03 +0800 Message-Id: <20230421090403.15515-3-zhoufeng.zf@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20230421090403.15515-1-zhoufeng.zf@bytedance.com> References: <20230421090403.15515-1-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 kfunc bpf_task_under_cgroup(). The bpf program saves the pid which call the getuid syscall within a given cgroup 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 | 46 +++++++++++++++++++ .../selftests/bpf/progs/cgrp_kfunc_common.h | 1 + .../bpf/progs/test_task_under_cgroup.c | 40 ++++++++++++++++ 3 files changed, 87 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..bd3deb469938 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Bytedance */ + +#include +#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; + + foo = test__join_cgroup(FOO); + if (!ASSERT_OK(foo < 0, "cgroup_join_foo")) + return; + + skel = test_task_under_cgroup__open(); + if (!ASSERT_OK_PTR(skel, "test_task_under_cgroup__open")) + goto cleanup; + + skel->rodata->local_pid = getpid(); + skel->rodata->cgid = get_cgroup_id(FOO); + + 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; + + 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/cgrp_kfunc_common.h b/tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h index 22914a70db54..41b3ea231698 100644 --- a/tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h +++ b/tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h @@ -26,6 +26,7 @@ struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level) __ksym; struct cgroup *bpf_cgroup_from_id(u64 cgid) __ksym; void bpf_rcu_read_lock(void) __ksym; void bpf_rcu_read_unlock(void) __ksym; +int bpf_task_under_cgroup(struct cgroup *cgrp, struct task_struct *task) __ksym; static inline struct __cgrps_kfunc_map_value *cgrps_kfunc_map_value_lookup(struct cgroup *cgrp) { 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..e2740f9b029d --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_task_under_cgroup.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Bytedance */ + +#include +#include +#include +#include + +#include "cgrp_kfunc_common.h" + +const volatile int local_pid; +const volatile long cgid; +int remote_pid; + +SEC("tp_btf/sys_enter") +int BPF_PROG(sysenter, struct pt_regs *regs, long id) +{ + struct cgroup *cgrp; + + if (id != __NR_getuid) + return 0; + + if (local_pid != (bpf_get_current_pid_tgid() >> 32)) + return 0; + + cgrp = bpf_cgroup_from_id(cgid); + if (!cgrp) + return 0; + + if (!bpf_task_under_cgroup(cgrp, bpf_get_current_task_btf())) + goto out; + + remote_pid = local_pid; + +out: + bpf_cgroup_release(cgrp); + return 0; +} + +char _license[] SEC("license") = "GPL";