From patchwork Sat Nov 21 02:46:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 11923115 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CFA24C56201 for ; Sat, 21 Nov 2020 02:46:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A306D22403 for ; Sat, 21 Nov 2020 02:46:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727081AbgKUCqj convert rfc822-to-8bit (ORCPT ); Fri, 20 Nov 2020 21:46:39 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:63126 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727024AbgKUCqj (ORCPT ); Fri, 20 Nov 2020 21:46:39 -0500 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0AL2c9TE031688 for ; Fri, 20 Nov 2020 18:46:38 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 34wthf2jaw-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 20 Nov 2020 18:46:38 -0800 Received: from intmgw001.08.frc2.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Fri, 20 Nov 2020 18:46:36 -0800 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 7DCD82EC9CD8; Fri, 20 Nov 2020 18:46:35 -0800 (PST) From: Andrii Nakryiko To: , , , CC: , Subject: [PATCH bpf-next 7/7] selftests/bpf: add fentry/fexit/fmod_ret selftest for kernel module Date: Fri, 20 Nov 2020 18:46:16 -0800 Message-ID: <20201121024616.1588175-8-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201121024616.1588175-1-andrii@kernel.org> References: <20201121024616.1588175-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-20_17:2020-11-20,2020-11-20 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxlogscore=999 lowpriorityscore=0 bulkscore=0 phishscore=0 spamscore=0 adultscore=0 impostorscore=0 clxscore=1034 priorityscore=1501 suspectscore=8 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011210019 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add new selftest checking attachment of fentry/fexit/fmod_ret (and raw tracepoint ones for completeness) BPF programs to kernel module function. Signed-off-by: Andrii Nakryiko --- .../selftests/bpf/prog_tests/module_attach.c | 53 +++++++++++++++ .../selftests/bpf/progs/test_module_attach.c | 66 +++++++++++++++++++ 2 files changed, 119 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/module_attach.c create mode 100644 tools/testing/selftests/bpf/progs/test_module_attach.c diff --git a/tools/testing/selftests/bpf/prog_tests/module_attach.c b/tools/testing/selftests/bpf/prog_tests/module_attach.c new file mode 100644 index 000000000000..c871ac073bcf --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/module_attach.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include +#include "test_module_attach.skel.h" + +static int duration; + +static int trigger_module_test_read(int read_sz) +{ + int fd, err; + + fd = open("/sys/kernel/bpf_sidecar", O_RDONLY); + err = -errno; + if (CHECK(fd < 0, "sidecar_file_open", "failed: %d\n", err)) + return err; + + read(fd, NULL, read_sz); + close(fd); + + return 0; +} + +void test_module_attach(void) +{ + const int READ_SZ = 456; + struct test_module_attach* skel; + struct test_module_attach__bss *bss; + int err; + + skel = test_module_attach__open_and_load(); + if (CHECK(!skel, "skel_open", "failed to open skeleton\n")) + return; + + bss = skel->bss; + + err = test_module_attach__attach(skel); + if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err)) + goto cleanup; + + /* trigger tracepoint */ + ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read"); + + ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp"); + ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf"); + ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry"); + ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit"); + ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet"); + ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret"); + +cleanup: + test_module_attach__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_module_attach.c b/tools/testing/selftests/bpf/progs/test_module_attach.c new file mode 100644 index 000000000000..4c79261d95e6 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_module_attach.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include "vmlinux.h" +#include +#include +#include +#include "../bpf_sidecar/bpf_sidecar.h" + +__u32 raw_tp_read_sz = 0; + +SEC("raw_tp/bpf_sidecar_test_read") +int BPF_PROG(handle_raw_tp, + struct task_struct *task, struct bpf_sidecar_test_read_ctx *read_ctx) +{ + raw_tp_read_sz = BPF_CORE_READ(read_ctx, len); + return 0; +} + +__u32 tp_btf_read_sz = 0; + +SEC("tp_btf/bpf_sidecar_test_read") +int BPF_PROG(handle_tp_btf, + struct task_struct *task, struct bpf_sidecar_test_read_ctx *read_ctx) +{ + tp_btf_read_sz = read_ctx->len; + return 0; +} + +__u32 fentry_read_sz = 0; + +SEC("fentry/bpf_sidecar_test_read") +int BPF_PROG(handle_fentry, + struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len) +{ + fentry_read_sz = len; + return 0; +} + +__u32 fexit_read_sz = 0; +int fexit_ret = 0; + +SEC("fexit/bpf_sidecar_test_read") +int BPF_PROG(handle_fexit, + struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len, + int ret) +{ + fexit_read_sz = len; + fexit_ret = ret; + return 0; +} + +__u32 fmod_ret_read_sz = 0; + +SEC("fmod_ret/bpf_sidecar_test_read") +int BPF_PROG(handle_fmod_ret, + struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len) +{ + fmod_ret_read_sz = len; + return 0; /* don't override the exit code */ +} + +char _license[] SEC("license") = "GPL";