From patchwork Wed May 18 20:59:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 12854148 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 5EDABC4332F for ; Wed, 18 May 2022 21:01:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242985AbiERVBU (ORCPT ); Wed, 18 May 2022 17:01:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243051AbiERVBF (ORCPT ); Wed, 18 May 2022 17:01:05 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D88D1259F82 for ; Wed, 18 May 2022 14:00:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652907634; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gC0dx605l5WeGGnTBbF9J16eadz0PSMt0gS7tJITGSE=; b=AXJlo4Ov0uzBCVvPr9elL88o7gnDJBPRxbZnrTFmfb1L4ggcCby6KzHbOhhM90nv3jmr4i PEwsZJhwVT6YjXtgkGrtwE7wqITEMoJJdkHuNnsVeT9b+8lcrMBStkcnU5/3SmhhmXZjyJ j12B2yVz0bu1eXi1z4UkqPAcM40vUAI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-211-pVi_G_J8Nyy_ic7mB6udZg-1; Wed, 18 May 2022 17:00:29 -0400 X-MC-Unique: pVi_G_J8Nyy_ic7mB6udZg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CB9E8381078F; Wed, 18 May 2022 21:00:27 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.58]) by smtp.corp.redhat.com (Postfix) with ESMTP id 94DB82166B25; Wed, 18 May 2022 21:00:18 +0000 (UTC) From: Benjamin Tissoires To: Greg KH , Jiri Kosina , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Shuah Khan , Dave Marchevsky , Joe Stringer , Jonathan Corbet Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires Subject: [PATCH bpf-next v5 12/17] selftests/bpf: add tests for bpf_hid_hw_request Date: Wed, 18 May 2022 22:59:19 +0200 Message-Id: <20220518205924.399291-13-benjamin.tissoires@redhat.com> In-Reply-To: <20220518205924.399291-1-benjamin.tissoires@redhat.com> References: <20220518205924.399291-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Add tests for the newly implemented function. We test here only the GET_REPORT part because the other calls are pure HID protocol and won't infer the result of the test of the bpf hook. Signed-off-by: Benjamin Tissoires --- changes in v5: - use the new hid_bpf_allocate_context() API - remove the need for ctx_in for syscall TEST_RUN changes in v3: - use the new hid_get_data API - directly use HID_FEATURE_REPORT and HID_REQ_GET_REPORT from uapi changes in v2: - split the series by bpf/libbpf/hid/selftests and samples --- tools/testing/selftests/bpf/prog_tests/hid.c | 114 ++++++++++++++++--- tools/testing/selftests/bpf/progs/hid.c | 59 ++++++++++ 2 files changed, 155 insertions(+), 18 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/hid.c b/tools/testing/selftests/bpf/prog_tests/hid.c index 47bc0a30c275..54c0a0fcd54d 100644 --- a/tools/testing/selftests/bpf/prog_tests/hid.c +++ b/tools/testing/selftests/bpf/prog_tests/hid.c @@ -77,12 +77,23 @@ static unsigned char rdesc[] = { 0xc0, /* END_COLLECTION */ }; +static u8 feature_data[] = { 1, 2 }; + struct attach_prog_args { int prog_fd; unsigned int hid; int retval; }; +struct hid_hw_request_syscall_args { + __u8 data[10]; + unsigned int hid; + int retval; + size_t size; + enum hid_report_type type; + __u8 request_type; +}; + static pthread_mutex_t uhid_started_mtx = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t uhid_started = PTHREAD_COND_INITIALIZER; @@ -142,7 +153,7 @@ static void destroy(int fd) static int uhid_event(int fd) { - struct uhid_event ev; + struct uhid_event ev, answer; ssize_t ret; memset(&ev, 0, sizeof(ev)); @@ -183,6 +194,15 @@ static int uhid_event(int fd) break; case UHID_GET_REPORT: fprintf(stderr, "UHID_GET_REPORT from uhid-dev\n"); + + answer.type = UHID_GET_REPORT_REPLY; + answer.u.get_report_reply.id = ev.u.get_report.id; + answer.u.get_report_reply.err = ev.u.get_report.rnum == 1 ? 0 : -EIO; + answer.u.get_report_reply.size = sizeof(feature_data); + memcpy(answer.u.get_report_reply.data, feature_data, sizeof(feature_data)); + + uhid_write(fd, &answer); + break; case UHID_SET_REPORT: fprintf(stderr, "UHID_SET_REPORT from uhid-dev\n"); @@ -391,6 +411,7 @@ static int open_hidraw(int dev_id) struct test_params { struct hid *skel; int hidraw_fd; + int hid_id; }; static int prep_test(int dev_id, const char *prog_name, struct test_params *test_data) @@ -419,27 +440,33 @@ static int prep_test(int dev_id, const char *prog_name, struct test_params *test if (!ASSERT_OK_PTR(hid_skel, "hid_skel_open")) goto cleanup; - prog = bpf_object__find_program_by_name(*hid_skel->skeleton->obj, prog_name); - if (!ASSERT_OK_PTR(prog, "find_prog_by_name")) - goto cleanup; + if (prog_name) { + prog = bpf_object__find_program_by_name(*hid_skel->skeleton->obj, prog_name); + if (!ASSERT_OK_PTR(prog, "find_prog_by_name")) + goto cleanup; - bpf_program__set_autoload(prog, true); + bpf_program__set_autoload(prog, true); - err = hid__load(hid_skel); - if (!ASSERT_OK(err, "hid_skel_load")) - goto cleanup; + err = hid__load(hid_skel); + if (!ASSERT_OK(err, "hid_skel_load")) + goto cleanup; - attach_fd = bpf_program__fd(hid_skel->progs.attach_prog); - if (!ASSERT_GE(attach_fd, 0, "locate attach_prog")) { - err = attach_fd; - goto cleanup; - } + attach_fd = bpf_program__fd(hid_skel->progs.attach_prog); + if (!ASSERT_GE(attach_fd, 0, "locate attach_prog")) { + err = attach_fd; + goto cleanup; + } - args.prog_fd = bpf_program__fd(prog); - err = bpf_prog_test_run_opts(attach_fd, &tattr); - snprintf(buf, sizeof(buf), "attach_hid(%s)", prog_name); - if (!ASSERT_EQ(args.retval, 0, buf)) - goto cleanup; + args.prog_fd = bpf_program__fd(prog); + err = bpf_prog_test_run_opts(attach_fd, &tattr); + snprintf(buf, sizeof(buf), "attach_hid(%s)", prog_name); + if (!ASSERT_EQ(args.retval, 0, buf)) + goto cleanup; + } else { + err = hid__load(hid_skel); + if (!ASSERT_OK(err, "hid_skel_load")) + goto cleanup; + } hidraw_fd = open_hidraw(dev_id); if (!ASSERT_GE(hidraw_fd, 0, "open_hidraw")) @@ -447,6 +474,7 @@ static int prep_test(int dev_id, const char *prog_name, struct test_params *test test_data->skel = hid_skel; test_data->hidraw_fd = hidraw_fd; + test_data->hid_id = hid_id; return 0; @@ -693,6 +721,54 @@ static int test_hid_change_report(int uhid_fd, int dev_id) return ret; } +/* + * Attach hid_user_raw_request to the given uhid device, + * call the bpf program from userspace + * check that the program is called and does the expected. + */ +static int test_hid_user_raw_request_call(int uhid_fd, int dev_id) +{ + struct test_params params; + int err, prog_fd; + int ret = -1; + struct hid_hw_request_syscall_args args = { + .retval = -1, + .type = HID_FEATURE_REPORT, + .request_type = HID_REQ_GET_REPORT, + .size = 10, + }; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs, + .ctx_in = &args, + .ctx_size_in = sizeof(args), + ); + + err = prep_test(dev_id, NULL, ¶ms); + if (!ASSERT_EQ(err, 0, "prep_test()")) + goto cleanup; + + args.hid = params.hid_id; + args.data[0] = 1; /* report ID */ + + prog_fd = bpf_program__fd(params.skel->progs.hid_user_raw_request); + + err = bpf_prog_test_run_opts(prog_fd, &tattrs); + if (!ASSERT_EQ(err, 0, "bpf_prog_test_run_opts")) + goto cleanup; + + if (!ASSERT_EQ(args.retval, 2, "bpf_prog_test_run_opts_retval")) + goto cleanup; + + if (!ASSERT_EQ(args.data[1], 2, "hid_user_raw_request_check_in")) + goto cleanup; + + ret = 0; + +cleanup: + cleanup_test(¶ms); + + return ret; +} + void serial_test_hid_bpf(void) { int err, uhid_fd; @@ -720,6 +796,8 @@ void serial_test_hid_bpf(void) ASSERT_OK(err, "hid_attach_detach"); err = test_hid_change_report(uhid_fd, dev_id); ASSERT_OK(err, "hid_change_report"); + err = test_hid_user_raw_request_call(uhid_fd, dev_id); + ASSERT_OK(err, "hid_change_report"); destroy(uhid_fd); diff --git a/tools/testing/selftests/bpf/progs/hid.c b/tools/testing/selftests/bpf/progs/hid.c index ee7529c47ad8..e3444d444303 100644 --- a/tools/testing/selftests/bpf/progs/hid.c +++ b/tools/testing/selftests/bpf/progs/hid.c @@ -10,6 +10,13 @@ extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t __sz) __ksym; extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym; +extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym; +extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym; +extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, + __u8 *data, + size_t len, + enum hid_report_type type, + int reqtype) __ksym; struct attach_prog_args { int prog_fd; @@ -56,3 +63,55 @@ int attach_prog(struct attach_prog_args *ctx) 0); return 0; } + +struct hid_hw_request_syscall_args { + /* data needs to come at offset 0 so we can do a memcpy into it */ + __u8 data[10]; + unsigned int hid; + int retval; + size_t size; + enum hid_report_type type; + __u8 request_type; +}; + +SEC("syscall") +int hid_user_raw_request(struct hid_hw_request_syscall_args *args) +{ + struct hid_bpf_ctx *ctx; + int i, ret = 0; + __u8 *data; + + ctx = hid_bpf_allocate_context(args->hid); + if (!ctx) + return 0; /* EPERM check */ + + /* We can not use the context data memory directly in the hid_bpf call, + * so we rely on the PTR_TO_MEM allocated in the hid_bpf_context + */ + data = hid_bpf_get_data(ctx, 0 /* offset */, 10 /* size */); + if (!data) + goto out; /* EPERM check */ + + __builtin_memcpy(data, args->data, sizeof(args->data)); + + if (args->size <= sizeof(args->data)) { + ret = hid_bpf_hw_request(ctx, + data, + args->size, + args->type, + args->request_type); + args->retval = ret; + if (ret < 0) + goto out; + } else { + ret = -7; /* -E2BIG */ + goto out; + } + + __builtin_memcpy(args->data, data, sizeof(args->data)); + + out: + hid_bpf_release_context(ctx); + + return ret; +}