From patchwork Fri Mar 4 17:28:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 12769668 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 67D2EC433EF for ; Fri, 4 Mar 2022 17:35:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241258AbiCDRgT (ORCPT ); Fri, 4 Mar 2022 12:36:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48060 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241253AbiCDRfo (ORCPT ); Fri, 4 Mar 2022 12:35:44 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 321AA53B72 for ; Fri, 4 Mar 2022 09:34:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646415259; 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=WrwFvawmGNYLjBbdBaVrUJ4+1AcvrT1rP+FxAAGD/3Y=; b=YMlfOy0aDqtuS6+g/I0cwlYPaVEo6YAi3fKBdhxsftjSw4PFykTEozsEzERvJ9GgvUnV1c PBHXX/m1ew7dEy7HPRtCTzNxm6h/D+4sum8bPRUPComJfrQ5P+DV3AFah/fvbBKGFezN6J ajSQkp9Pxic1v6ag4DlV/v9AnAT2xzU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-408-piTcRwObNu6k0pucFk9asw-1; Fri, 04 Mar 2022 12:34:13 -0500 X-MC-Unique: piTcRwObNu6k0pucFk9asw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 47AB3824FA6; Fri, 4 Mar 2022 17:34:11 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id 45500865A7; Fri, 4 Mar 2022 17:34:07 +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 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, Benjamin Tissoires Subject: [PATCH bpf-next v2 21/28] selftests/bpf: add tests for bpf_hid_hw_request Date: Fri, 4 Mar 2022 18:28:45 +0100 Message-Id: <20220304172852.274126-22-benjamin.tissoires@redhat.com> In-Reply-To: <20220304172852.274126-1-benjamin.tissoires@redhat.com> References: <20220304172852.274126-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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 v2: - split the series by bpf/libbpf/hid/selftests and samples --- tools/testing/selftests/bpf/prog_tests/hid.c | 71 +++++++++++++++++++- tools/testing/selftests/bpf/progs/hid.c | 57 ++++++++++++++++ 2 files changed, 127 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/hid.c b/tools/testing/selftests/bpf/prog_tests/hid.c index cc01601c1168..a2bab6a799a1 100644 --- a/tools/testing/selftests/bpf/prog_tests/hid.c +++ b/tools/testing/selftests/bpf/prog_tests/hid.c @@ -67,6 +67,8 @@ static unsigned char rdesc[] = { 0xc0, /* END_COLLECTION */ }; +static u8 feature_data[] = { 1, 2 }; + static pthread_mutex_t uhid_started_mtx = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t uhid_started = PTHREAD_COND_INITIALIZER; @@ -126,7 +128,7 @@ static void destroy(int fd) static int event(int fd) { - struct uhid_event ev; + struct uhid_event ev, answer; ssize_t ret; memset(&ev, 0, sizeof(ev)); @@ -143,6 +145,8 @@ static int event(int fd) return -EFAULT; } + memset(&answer, 0, sizeof(answer)); + switch (ev.type) { case UHID_START: pthread_mutex_lock(&uhid_started_mtx); @@ -167,6 +171,15 @@ static int 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"); @@ -516,6 +529,59 @@ static int test_hid_user_call(struct hid *hid_skel, int uhid_fd, int sysfs_fd) 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(struct hid *hid_skel, int uhid_fd, int sysfs_fd) +{ + int err, prog_fd; + u8 buf[10] = {0}; + int ret = -1; + + LIBBPF_OPTS(bpf_test_run_opts, run_attrs, + .repeat = 1, + .ctx_in = &sysfs_fd, + .ctx_size_in = sizeof(sysfs_fd), + .data_in = buf, + .data_size_in = sizeof(buf), + .data_out = buf, + .data_size_out = sizeof(buf), + ); + + /* attach hid_user_raw_request program */ + hid_skel->links.hid_user_raw_request = + bpf_program__attach_hid(hid_skel->progs.hid_user_raw_request, sysfs_fd); + if (!ASSERT_OK_PTR(hid_skel->links.hid_user_raw_request, + "attach_hid(hid_user_raw_request)")) + return PTR_ERR(hid_skel->links.hid_user_raw_request); + + buf[0] = 2; /* HID_FEATURE_REPORT */ + buf[1] = 1; /* HID_REQ_GET_REPORT */ + buf[2] = 1; /* report ID */ + + prog_fd = bpf_program__fd(hid_skel->progs.hid_user_raw_request); + + err = bpf_prog_test_run_opts(prog_fd, &run_attrs); + if (!ASSERT_EQ(err, 0, "bpf_prog_test_run_xattr")) + goto cleanup; + + if (!ASSERT_EQ(run_attrs.retval, 2, "bpf_prog_test_run_xattr_retval")) + goto cleanup; + + if (!ASSERT_EQ(buf[3], 2, "hid_user_raw_request_check_in")) + goto cleanup; + + ret = 0; + +cleanup: + + hid__detach(hid_skel); + + return ret; +} + /* * Attach hid_rdesc_fixup to the given uhid device, * retrieve and open the matching hidraw node, @@ -626,6 +692,9 @@ void serial_test_hid_bpf(void) err = test_hid_user_call(hid_skel, uhid_fd, sysfs_fd); ASSERT_OK(err, "hid_user"); + err = test_hid_user_raw_request_call(hid_skel, uhid_fd, sysfs_fd); + ASSERT_OK(err, "hid_user_raw_request"); + err = test_rdesc_fixup(hid_skel, uhid_fd, sysfs_fd); ASSERT_OK(err, "hid_rdesc_fixup"); diff --git a/tools/testing/selftests/bpf/progs/hid.c b/tools/testing/selftests/bpf/progs/hid.c index fabfaf0f2526..ea011ff9e752 100644 --- a/tools/testing/selftests/bpf/progs/hid.c +++ b/tools/testing/selftests/bpf/progs/hid.c @@ -9,6 +9,11 @@ char _license[] SEC("license") = "GPL"; __u64 callback_check = 52; __u64 callback2_check = 52; +struct { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, 4096 * 64); +} ringbuf SEC(".maps"); + SEC("hid/device_event") int hid_first_event(struct hid_bpf_ctx *ctx) { @@ -121,3 +126,55 @@ int hid_user(struct hid_bpf_ctx *ctx) return 0; } + +SEC("hid/user_event") +int hid_user_raw_request(struct hid_bpf_ctx *ctx) +{ + const unsigned int buflen = 256; + const unsigned int _buflen = buflen * sizeof(__u8); + __u8 *buf; + int ret; + __u32 size; + __u8 rtype, reqtype; + + buf = bpf_ringbuf_reserve(&ringbuf, _buflen, 0); + if (!buf) + return -12; /* -ENOMEM */ + + __builtin_memcpy(buf, ctx->data, _buflen); + + /* + * build up a custom API for our needs: + * offset 0, size 1: report type + * offset 1, size 1: request type + * offset 2+: data + */ + rtype = buf[0]; + reqtype = buf[1]; + size = ctx->size - 2; + + if (size < _buflen - 2) { + ret = bpf_hid_raw_request(ctx, + &buf[2], + size, + rtype, + reqtype); + if (ret < 0) + goto discard; + } else { + ret = -7; /* -E2BIG */ + goto discard; + } + + __builtin_memcpy(&ctx->data[2], &buf[2], _buflen - 2); + + ctx->size = ret + 2; + ctx->u.user.retval = ret; + + ret = 0; + + discard: + bpf_ringbuf_discard(buf, 0); + + return ret; +}