// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022-2024 Red Hat */
#include "hid.skel.h"
#include "hid_common.h"
#include <bpf/bpf.h>
struct attach_prog_args {
int prog_fd;
unsigned int hid;
int retval;
int insert_head;
};
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;
};
FIXTURE(hid_bpf) {
int dev_id;
int uhid_fd;
int hidraw_fd;
int hid_id;
pthread_t tid;
struct hid *skel;
struct bpf_link *hid_links[3]; /* max number of programs loaded in a single test */
};
static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
{
int i;
if (self->hidraw_fd)
close(self->hidraw_fd);
self->hidraw_fd = 0;
if (!self->skel)
return;
hid__detach(self->skel);
for (i = 0; i < ARRAY_SIZE(self->hid_links); i++) {
if (self->hid_links[i])
bpf_link__destroy(self->hid_links[i]);
}
hid__destroy(self->skel);
self->skel = NULL;
}
FIXTURE_TEARDOWN(hid_bpf) {
void *uhid_err;
uhid_destroy(_metadata, self->uhid_fd);
detach_bpf(self);
pthread_join(self->tid, &uhid_err);
}
#define TEARDOWN_LOG(fmt, ...) do { \
TH_LOG(fmt, ##__VA_ARGS__); \
hid_bpf_teardown(_metadata, self, variant); \
} while (0)
FIXTURE_SETUP(hid_bpf)
{
time_t t;
int err;
/* initialize random number generator */
srand((unsigned int)time(&t));
self->dev_id = rand() % 1024;
self->uhid_fd = setup_uhid(_metadata, self->dev_id);
/* locate the uev, self, variant);ent file of the created device */
self->hid_id = get_hid_id(self->dev_id);
ASSERT_GT(self->hid_id, 0)
TEARDOWN_LOG("Could not locate uhid device id: %d", self->hid_id);
err = uhid_start_listener(_metadata, &self->tid, self->uhid_fd);
ASSERT_EQ(0, err) TEARDOWN_LOG("could not start udev listener: %d", err);
}
struct test_program {
const char *name;
int insert_head;
};
#define LOAD_PROGRAMS(progs) \
load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant)
#define LOAD_BPF \
load_programs(NULL, 0, _metadata, self, variant)
static void load_programs(const struct test_program programs[],
const size_t progs_count,
struct __test_metadata *_metadata,
FIXTURE_DATA(hid_bpf) * self,
const FIXTURE_VARIANT(hid_bpf) * variant)
{
struct bpf_map *iter_map;
int err = -EINVAL;
ASSERT_LE(progs_count, ARRAY_SIZE(self->hid_links))
TH_LOG("too many programs are to be loaded");
/* open the bpf file */
self->skel = hid__open();
ASSERT_OK_PTR(self->skel) TEARDOWN_LOG("Error while calling hid__open");
for (int i = 0; i < progs_count; i++) {
struct bpf_program *prog;
struct bpf_map *map;
int *ops_hid_id;
prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
programs[i].name);
ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
bpf_program__set_autoload(prog, true);
map = bpf_object__find_map_by_name(*self->skel->skeleton->obj,
programs[i].name + 4);
ASSERT_OK_PTR(map) TH_LOG("can not find struct_ops by name '%s'",
programs[i].name + 4);
/* hid_id is the first field of struct hid_bpf_ops */
ops_hid_id = bpf_map__initial_value(map, NULL);
ASSERT_OK_PTR(ops_hid_id) TH_LOG("unable to retrieve struct_ops data");
*ops_hid_id = self->hid_id;
}
/* we disable the auto-attach feature of all maps because we
* only want the tested one to be manually attached in the next
* call to bpf_map__attach_struct_ops()
*/
bpf_object__for_each_map(iter_map, *self->skel->skeleton->obj)
bpf_map__set_autoattach(iter_map, false);
err = hid__load(self->skel);
ASSERT_OK(err) TH_LOG("hid_skel_load failed: %d", err);
for (int i = 0; i < progs_count; i++) {
struct bpf_map *map;
map = bpf_object__find_map_by_name(*self->skel->skeleton->obj,
programs[i].name + 4);
ASSERT_OK_PTR(map) TH_LOG("can not find struct_ops by name '%s'",
programs[i].name + 4);
self->hid_links[i] = bpf_map__attach_struct_ops(map);
ASSERT_OK_PTR(self->hid_links[i]) TH_LOG("failed to attach struct ops '%s'",
programs[i].name + 4);
}
hid__attach(self->skel);
self->hidraw_fd = open_hidraw(self->dev_id);
ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
}
/*
* A simple test to see if the fixture is working fine.
* If this fails, none of the other tests will pass.
*/
TEST_F(hid_bpf, test_create_uhid)
{
}
/*
* Attach hid_first_event to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the program sees it and can change the data
*/
TEST_F(hid_bpf, raw_event)
{
const struct test_program progs[] = {
{ .name = "hid_first_event" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* check that the program is correctly loaded */
ASSERT_EQ(self->skel->data->callback_check, 52) TH_LOG("callback_check1");
ASSERT_EQ(self->skel->data->callback2_check, 52) TH_LOG("callback2_check1");
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* check that hid_first_event() was executed */
ASSERT_EQ(self->skel->data->callback_check, 42) TH_LOG("callback_check1");
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[2], 47);
/* inject another event */
memset(buf, 0, sizeof(buf));
buf[0] = 1;
buf[1] = 47;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* check that hid_first_event() was executed */
ASSERT_EQ(self->skel->data->callback_check, 47) TH_LOG("callback_check1");
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[2], 52);
}
/*
* Attach hid_first_event to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the program sees it and can change the data
*/
TEST_F(hid_bpf, subprog_raw_event)
{
const struct test_program progs[] = {
{ .name = "hid_subprog_first_event" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[2], 47);
/* inject another event */
memset(buf, 0, sizeof(buf));
buf[0] = 1;
buf[1] = 47;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[2], 52);
}
/*
* Attach hid_first_event to the given uhid device,
* attempt at re-attaching it, we should not lock and
* return an invalid struct bpf_link
*/
TEST_F(hid_bpf, multiple_attach)
{
const struct test_program progs[] = {
{ .name = "hid_first_event" },
};
struct bpf_link *link;
LOAD_PROGRAMS(progs);
link = bpf_map__attach_struct_ops(self->skel->maps.first_event);
ASSERT_NULL(link) TH_LOG("unexpected return value when re-attaching the struct_ops");
}
/*
* Ensures that we can attach/detach programs
*/
TEST_F(hid_bpf, test_attach_detach)
{
const struct test_program progs[] = {
{ .name = "hid_first_event" },
{ .name = "hid_second_event" },
};
struct bpf_link *link;
__u8 buf[10] = {0};
int err, link_fd;
LOAD_PROGRAMS(progs);
link = self->hid_links[0];
ASSERT_OK_PTR(link) TH_LOG("HID-BPF link not created");
link_fd = bpf_link__fd(link);
ASSERT_GE(link_fd, 0) TH_LOG("HID-BPF link FD not valid");
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[2], 47);
/* make sure both programs are run */
ASSERT_EQ(buf[3], 52);
/* pin the first program and immediately unpin it */
#define PIN_PATH "/sys/fs/bpf/hid_first_event"
err = bpf_obj_pin(link_fd, PIN_PATH);
ASSERT_OK(err) TH_LOG("error while calling bpf_obj_pin");
remove(PIN_PATH);
#undef PIN_PATH
usleep(100000);
/* detach the program */
detach_bpf(self);
self->hidraw_fd = open_hidraw(self->dev_id);
ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
/* inject another event */
memset(buf, 0, sizeof(buf));
buf[0] = 1;
buf[1] = 47;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw_no_bpf");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 47);
ASSERT_EQ(buf[2], 0);
ASSERT_EQ(buf[3], 0);
/* re-attach our program */
LOAD_PROGRAMS(progs);
/* inject one event */
memset(buf, 0, sizeof(buf));
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[2], 47);
ASSERT_EQ(buf[3], 52);
}
/*
* Attach hid_change_report_id to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the program sees it and can change the data
*/
TEST_F(hid_bpf, test_hid_change_report)
{
const struct test_program progs[] = {
{ .name = "hid_change_report_id" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 9) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 2);
ASSERT_EQ(buf[1], 42);
ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test");
}
/*
* Call hid_bpf_input_report against the given uhid device,
* check that the program is called and does the expected.
*/
TEST_F(hid_bpf, test_hid_user_input_report_call)
{
struct hid_hw_request_syscall_args args = {
.retval = -1,
.size = 10,
};
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs,
.ctx_in = &args,
.ctx_size_in = sizeof(args),
);
__u8 buf[10] = {0};
int err, prog_fd;
LOAD_BPF;
args.hid = self->hid_id;
args.data[0] = 1; /* report ID */
args.data[1] = 2; /* report ID */
args.data[2] = 42; /* report ID */
prog_fd = bpf_program__fd(self->skel->progs.hid_user_input_report);
/* check that there is no data to read from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, -1) TH_LOG("read_hidraw");
err = bpf_prog_test_run_opts(prog_fd, &tattrs);
ASSERT_OK(err) TH_LOG("error while calling bpf_prog_test_run_opts");
ASSERT_EQ(args.retval, 0);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 2);
ASSERT_EQ(buf[2], 42);
}
/*
* Call hid_bpf_hw_output_report against the given uhid device,
* check that the program is called and does the expected.
*/
TEST_F(hid_bpf, test_hid_user_output_report_call)
{
struct hid_hw_request_syscall_args args = {
.retval = -1,
.size = 10,
};
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs,
.ctx_in = &args,
.ctx_size_in = sizeof(args),
);
int err, cond_err, prog_fd;
struct timespec time_to_wait;
LOAD_BPF;
args.hid = self->hid_id;
args.data[0] = 1; /* report ID */
args.data[1] = 2; /* report ID */
args.data[2] = 42; /* report ID */
prog_fd = bpf_program__fd(self->skel->progs.hid_user_output_report);
pthread_mutex_lock(&uhid_output_mtx);
memset(output_report, 0, sizeof(output_report));
clock_gettime(CLOCK_REALTIME, &time_to_wait);
time_to_wait.tv_sec += 2;
err = bpf_prog_test_run_opts(prog_fd, &tattrs);
cond_err = pthread_cond_timedwait(&uhid_output_cond, &uhid_output_mtx, &time_to_wait);
ASSERT_OK(err) TH_LOG("error while calling bpf_prog_test_run_opts");
ASSERT_OK(cond_err) TH_LOG("error while calling waiting for the condition");
ASSERT_EQ(args.retval, 3);
ASSERT_EQ(output_report[0], 1);
ASSERT_EQ(output_report[1], 2);
ASSERT_EQ(output_report[2], 42);
pthread_mutex_unlock(&uhid_output_mtx);
}
/*
* Call hid_hw_raw_request against the given uhid device,
* check that the program is called and does the expected.
*/
TEST_F(hid_bpf, test_hid_user_raw_request_call)
{
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),
);
int err, prog_fd;
LOAD_BPF;
args.hid = self->hid_id;
args.data[0] = 1; /* report ID */
prog_fd = bpf_program__fd(self->skel->progs.hid_user_raw_request);
err = bpf_prog_test_run_opts(prog_fd, &tattrs);
ASSERT_OK(err) TH_LOG("error while calling bpf_prog_test_run_opts");
ASSERT_EQ(args.retval, 2);
ASSERT_EQ(args.data[1], 2);
}
/*
* Call hid_hw_raw_request against the given uhid device,
* check that the program is called and prevents the
* call to uhid.
*/
TEST_F(hid_bpf, test_hid_filter_raw_request_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_filter_raw_request" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* first check that we did not attach to device_event */
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 42);
ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test");
/* now check that our program is preventing hid_hw_raw_request() */
/* emit hid_hw_raw_request from hidraw */
/* Get Feature */
memset(buf, 0, sizeof(buf));
buf[0] = 0x1; /* Report Number */
err = ioctl(self->hidraw_fd, HIDIOCGFEATURE(sizeof(buf)), buf);
ASSERT_LT(err, 0) TH_LOG("unexpected success while reading HIDIOCGFEATURE: %d", err);
ASSERT_EQ(errno, 20) TH_LOG("unexpected error code while reading HIDIOCGFEATURE: %d",
errno);
/* remove our bpf program and check that we can now emit commands */
/* detach the program */
detach_bpf(self);
self->hidraw_fd = open_hidraw(self->dev_id);
ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
err = ioctl(self->hidraw_fd, HIDIOCGFEATURE(sizeof(buf)), buf);
ASSERT_GE(err, 0) TH_LOG("error while reading HIDIOCGFEATURE: %d", err);
}
/*
* Call hid_hw_raw_request against the given uhid device,
* check that the program is called and can issue the call
* to uhid and transform the answer.
*/
TEST_F(hid_bpf, test_hid_change_raw_request_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_hidraw_raw_request" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* emit hid_hw_raw_request from hidraw */
/* Get Feature */
memset(buf, 0, sizeof(buf));
buf[0] = 0x1; /* Report Number */
err = ioctl(self->hidraw_fd, HIDIOCGFEATURE(sizeof(buf)), buf);
ASSERT_EQ(err, 3) TH_LOG("unexpected returned size while reading HIDIOCGFEATURE: %d", err);
ASSERT_EQ(buf[0], 2);
ASSERT_EQ(buf[1], 3);
ASSERT_EQ(buf[2], 4);
}
/*
* Call hid_hw_raw_request against the given uhid device,
* check that the program is not making infinite loops.
*/
TEST_F(hid_bpf, test_hid_infinite_loop_raw_request_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_infinite_loop_raw_request" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* emit hid_hw_raw_request from hidraw */
/* Get Feature */
memset(buf, 0, sizeof(buf));
buf[0] = 0x1; /* Report Number */
err = ioctl(self->hidraw_fd, HIDIOCGFEATURE(sizeof(buf)), buf);
ASSERT_EQ(err, 3) TH_LOG("unexpected returned size while reading HIDIOCGFEATURE: %d", err);
}
/*
* Call hid_hw_output_report against the given uhid device,
* check that the program is called and prevents the
* call to uhid.
*/
TEST_F(hid_bpf, test_hid_filter_output_report_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_filter_output_report" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* first check that we did not attach to device_event */
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 42);
ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test");
/* now check that our program is preventing hid_hw_output_report() */
buf[0] = 1; /* report ID */
buf[1] = 2;
buf[2] = 42;
err = write(self->hidraw_fd, buf, 3);
ASSERT_LT(err, 0) TH_LOG("unexpected success while sending hid_hw_output_report: %d", err);
ASSERT_EQ(errno, 25) TH_LOG("unexpected error code while sending hid_hw_output_report: %d",
errno);
/* remove our bpf program and check that we can now emit commands */
/* detach the program */
detach_bpf(self);
self->hidraw_fd = open_hidraw(self->dev_id);
ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
err = write(self->hidraw_fd, buf, 3);
ASSERT_GE(err, 0) TH_LOG("error while sending hid_hw_output_report: %d", err);
}
/*
* Call hid_hw_output_report against the given uhid device,
* check that the program is called and can issue the call
* to uhid and transform the answer.
*/
TEST_F(hid_bpf, test_hid_change_output_report_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_hidraw_output_report" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* emit hid_hw_output_report from hidraw */
buf[0] = 1; /* report ID */
buf[1] = 2;
buf[2] = 42;
err = write(self->hidraw_fd, buf, 10);
ASSERT_EQ(err, 2) TH_LOG("unexpected returned size while sending hid_hw_output_report: %d",
err);
}
/*
* Call hid_hw_output_report against the given uhid device,
* check that the program is not making infinite loops.
*/
TEST_F(hid_bpf, test_hid_infinite_loop_output_report_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_infinite_loop_output_report" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* emit hid_hw_output_report from hidraw */
buf[0] = 1; /* report ID */
buf[1] = 2;
buf[2] = 42;
err = write(self->hidraw_fd, buf, 8);
ASSERT_EQ(err, 2) TH_LOG("unexpected returned size while sending hid_hw_output_report: %d",
err);
}
/*
* Attach hid_multiply_event_wq to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the program sees it and can add extra data
*/
TEST_F(hid_bpf, test_multiply_events_wq)
{
const struct test_program progs[] = {
{ .name = "hid_test_multiply_events_wq" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 47);
usleep(100000);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 9) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 2);
ASSERT_EQ(buf[1], 3);
}
/*
* Attach hid_multiply_event to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the program sees it and can add extra data
*/
TEST_F(hid_bpf, test_multiply_events)
{
const struct test_program progs[] = {
{ .name = "hid_test_multiply_events" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* inject one event */
buf[0] = 1;
buf[1] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 9) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 2);
ASSERT_EQ(buf[1], 47);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 9) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 2);
ASSERT_EQ(buf[1], 52);
}
/*
* Call hid_bpf_input_report against the given uhid device,
* check that the program is not making infinite loops.
*/
TEST_F(hid_bpf, test_hid_infinite_loop_input_report_call)
{
const struct test_program progs[] = {
{ .name = "hid_test_infinite_loop_input_report" },
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* emit hid_hw_output_report from hidraw */
buf[0] = 1; /* report ID */
buf[1] = 2;
buf[2] = 42;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 3);
/* read the data from hidraw: hid_bpf_try_input_report should work exactly one time */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[0], 1);
ASSERT_EQ(buf[1], 4);
/* read the data from hidraw: there should be none */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, -1) TH_LOG("read_hidraw");
}
/*
* Attach hid_insert{0,1,2} to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the programs have been inserted in the correct order.
*/
TEST_F(hid_bpf, test_hid_attach_flags)
{
const struct test_program progs[] = {
{
.name = "hid_test_insert2",
.insert_head = 0,
},
{
.name = "hid_test_insert1",
.insert_head = 1,
},
{
.name = "hid_test_insert3",
.insert_head = 0,
},
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* inject one event */
buf[0] = 1;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[1], 1);
ASSERT_EQ(buf[2], 2);
ASSERT_EQ(buf[3], 3);
}
/*
* 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)
{
char buf[1024];
if (level == LIBBPF_DEBUG)
return 0;
snprintf(buf, sizeof(buf), "# %s", format);
vfprintf(stdout, buf, args);
return 0;
}
int main(int argc, char **argv)
{
/* Use libbpf 1.0 API mode */
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
libbpf_set_print(libbpf_print_fn);
return test_harness_run(argc, argv);
}
Codebase Browser
linux