From patchwork Thu Nov 3 15:57:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 13030477 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 B7492C4332F for ; Thu, 3 Nov 2022 16:02:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232256AbiKCQBy (ORCPT ); Thu, 3 Nov 2022 12:01:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231976AbiKCQBc (ORCPT ); Thu, 3 Nov 2022 12:01:32 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77CD91B1DA for ; Thu, 3 Nov 2022 08:58:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1667491123; 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=b4MNGJCpTdv02hCMukTOwqvbxu/pzdcuFgGm//oqO/o=; b=eaeoPQqysUt7uXJTGbDHFeg7o7NjXmPNmWLgvteprOBGzbllEy14agkQ4UyASWoVkowOq2 JtMvNkyYbpyjnXbvwQSWzF11b1n0LxswSMtCV5V92S3KRBJs5GAP5+h+fsYRSub6IG6ihD Ij+qZnZmrU2M7pxaB8dZXUp2wvg8r6k= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-286-zvsi8fgVO6Wot40KOzuAOQ-1; Thu, 03 Nov 2022 11:58:40 -0400 X-MC-Unique: zvsi8fgVO6Wot40KOzuAOQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D98E6185A794; Thu, 3 Nov 2022 15:58:39 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.98]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3B9614A9254; Thu, 3 Nov 2022 15:58:38 +0000 (UTC) From: Benjamin Tissoires To: Greg KH , Jiri Kosina , Jonathan Corbet , Shuah Khan Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires Subject: [PATCH hid v12 11/15] selftests/hid: add report descriptor fixup tests Date: Thu, 3 Nov 2022 16:57:52 +0100 Message-Id: <20221103155756.687789-12-benjamin.tissoires@redhat.com> In-Reply-To: <20221103155756.687789-1-benjamin.tissoires@redhat.com> References: <20221103155756.687789-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Simple report descriptor override in HID: replace part of the report descriptor from a static definition in the bpf kernel program. Note that this test should be run last because we disconnect/reconnect the device, meaning that it changes the overall uhid device. Signed-off-by: Benjamin Tissoires --- no changes in v12 changes in v11: - use the new facility from selftests/hid no changes in v10 no changes in v9 no changes in v8 no changes in v7 no changes in v6 changes in v5: - amended for the new API not in v4 changes in v3: - added a comment to mention that this test needs to be run last changes in v2: - split the series by bpf/libbpf/hid/selftests and samples --- tools/testing/selftests/hid/hid_bpf.c | 32 +++++++++++++++ tools/testing/selftests/hid/progs/hid.c | 53 +++++++++++++++++++++++++ 2 files changed, 85 insertions(+) diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c index f77ee7fe4af4..eb329b5d299f 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -740,6 +740,38 @@ TEST_F(hid_bpf, test_hid_user_raw_request_call) ASSERT_EQ(args.data[1], 2); } +/* + * Attach hid_rdesc_fixup to the given uhid device, + * retrieve and open the matching hidraw node, + * check that the hidraw report descriptor has been updated. + */ +TEST_F(hid_bpf, test_rdesc_fixup) +{ + struct hidraw_report_descriptor rpt_desc = {0}; + const struct test_program progs[] = { + { .name = "hid_rdesc_fixup" }, + }; + int err, desc_size; + + LOAD_PROGRAMS(progs); + + /* check that hid_rdesc_fixup() was executed */ + ASSERT_EQ(self->skel->data->callback2_check, 0x21); + + /* read the exposed report descriptor from hidraw */ + err = ioctl(self->hidraw_fd, HIDIOCGRDESCSIZE, &desc_size); + ASSERT_GE(err, 0) TH_LOG("error while reading HIDIOCGRDESCSIZE: %d", err); + + /* ensure the new size of the rdesc is bigger than the old one */ + ASSERT_GT(desc_size, sizeof(rdesc)); + + rpt_desc.size = desc_size; + err = ioctl(self->hidraw_fd, HIDIOCGRDESC, &rpt_desc); + ASSERT_GE(err, 0) TH_LOG("error while reading HIDIOCGRDESC: %d", err); + + ASSERT_EQ(rpt_desc.value[4], 0x42); +} + static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args) { diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c index 7e35bb8e1abf..5758366a90e6 100644 --- a/tools/testing/selftests/hid/progs/hid.c +++ b/tools/testing/selftests/hid/progs/hid.c @@ -88,3 +88,56 @@ int hid_user_raw_request(struct hid_hw_request_syscall_args *args) return 0; } + +static const __u8 rdesc[] = { + 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */ + 0x09, 0x32, /* USAGE (Z) */ + 0x95, 0x01, /* REPORT_COUNT (1) */ + 0x81, 0x06, /* INPUT (Data,Var,Rel) */ + + 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */ + 0x19, 0x01, /* USAGE_MINIMUM (1) */ + 0x29, 0x03, /* USAGE_MAXIMUM (3) */ + 0x15, 0x00, /* LOGICAL_MINIMUM (0) */ + 0x25, 0x01, /* LOGICAL_MAXIMUM (1) */ + 0x95, 0x03, /* REPORT_COUNT (3) */ + 0x75, 0x01, /* REPORT_SIZE (1) */ + 0x91, 0x02, /* Output (Data,Var,Abs) */ + 0x95, 0x01, /* REPORT_COUNT (1) */ + 0x75, 0x05, /* REPORT_SIZE (5) */ + 0x91, 0x01, /* Output (Cnst,Var,Abs) */ + + 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */ + 0x19, 0x06, /* USAGE_MINIMUM (6) */ + 0x29, 0x08, /* USAGE_MAXIMUM (8) */ + 0x15, 0x00, /* LOGICAL_MINIMUM (0) */ + 0x25, 0x01, /* LOGICAL_MAXIMUM (1) */ + 0x95, 0x03, /* REPORT_COUNT (3) */ + 0x75, 0x01, /* REPORT_SIZE (1) */ + 0xb1, 0x02, /* Feature (Data,Var,Abs) */ + 0x95, 0x01, /* REPORT_COUNT (1) */ + 0x75, 0x05, /* REPORT_SIZE (5) */ + 0x91, 0x01, /* Output (Cnst,Var,Abs) */ + + 0xc0, /* END_COLLECTION */ + 0xc0, /* END_COLLECTION */ +}; + +SEC("?fmod_ret/hid_bpf_rdesc_fixup") +int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx) +{ + __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4096 /* size */); + + if (!data) + return 0; /* EPERM check */ + + callback2_check = data[4]; + + /* insert rdesc at offset 73 */ + __builtin_memcpy(&data[73], rdesc, sizeof(rdesc)); + + /* Change Usage Vendor globally */ + data[4] = 0x42; + + return sizeof(rdesc) + 73; +}