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Diffstat (limited to 'tools/testing/selftests/hid/hid_bpf.c')
-rw-r--r--tools/testing/selftests/hid/hid_bpf.c869
1 files changed, 869 insertions, 0 deletions
diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
new file mode 100644
index 000000000000..2cf96f818f25
--- /dev/null
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -0,0 +1,869 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Red Hat */
+#include "hid.skel.h"
+
+#include "../kselftest_harness.h"
+
+#include <bpf/bpf.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <dirent.h>
+#include <poll.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <linux/hidraw.h>
+#include <linux/uhid.h>
+
+#define SHOW_UHID_DEBUG 0
+
+static unsigned char rdesc[] = {
+ 0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
+ 0x09, 0x21, /* Usage (Vendor Usage 0x21) */
+ 0xa1, 0x01, /* COLLECTION (Application) */
+ 0x09, 0x01, /* Usage (Vendor Usage 0x01) */
+ 0xa1, 0x00, /* COLLECTION (Physical) */
+ 0x85, 0x02, /* REPORT_ID (2) */
+ 0x19, 0x01, /* USAGE_MINIMUM (1) */
+ 0x29, 0x08, /* USAGE_MAXIMUM (3) */
+ 0x15, 0x00, /* LOGICAL_MINIMUM (0) */
+ 0x25, 0xff, /* LOGICAL_MAXIMUM (255) */
+ 0x95, 0x08, /* REPORT_COUNT (8) */
+ 0x75, 0x08, /* REPORT_SIZE (8) */
+ 0x81, 0x02, /* INPUT (Data,Var,Abs) */
+ 0xc0, /* END_COLLECTION */
+ 0x09, 0x01, /* Usage (Vendor Usage 0x01) */
+ 0xa1, 0x00, /* COLLECTION (Physical) */
+ 0x85, 0x01, /* REPORT_ID (1) */
+ 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) */
+ 0x81, 0x02, /* INPUT (Data,Var,Abs) */
+ 0x95, 0x01, /* REPORT_COUNT (1) */
+ 0x75, 0x05, /* REPORT_SIZE (5) */
+ 0x81, 0x01, /* INPUT (Cnst,Var,Abs) */
+ 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
+ 0x09, 0x30, /* USAGE (X) */
+ 0x09, 0x31, /* USAGE (Y) */
+ 0x15, 0x81, /* LOGICAL_MINIMUM (-127) */
+ 0x25, 0x7f, /* LOGICAL_MAXIMUM (127) */
+ 0x75, 0x10, /* REPORT_SIZE (16) */
+ 0x95, 0x02, /* REPORT_COUNT (2) */
+ 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 */
+};
+
+static __u8 feature_data[] = { 1, 2 };
+
+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;
+};
+
+#define ASSERT_OK(data) ASSERT_FALSE(data)
+#define ASSERT_OK_PTR(ptr) ASSERT_NE(NULL, ptr)
+
+#define UHID_LOG(fmt, ...) do { \
+ if (SHOW_UHID_DEBUG) \
+ TH_LOG(fmt, ##__VA_ARGS__); \
+} while (0)
+
+static pthread_mutex_t uhid_started_mtx = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t uhid_started = PTHREAD_COND_INITIALIZER;
+
+/* no need to protect uhid_stopped, only one thread accesses it */
+static bool uhid_stopped;
+
+static int uhid_write(struct __test_metadata *_metadata, int fd, const struct uhid_event *ev)
+{
+ ssize_t ret;
+
+ ret = write(fd, ev, sizeof(*ev));
+ if (ret < 0) {
+ TH_LOG("Cannot write to uhid: %m");
+ return -errno;
+ } else if (ret != sizeof(*ev)) {
+ TH_LOG("Wrong size written to uhid: %zd != %zu",
+ ret, sizeof(ev));
+ return -EFAULT;
+ } else {
+ return 0;
+ }
+}
+
+static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb)
+{
+ struct uhid_event ev;
+ char buf[25];
+
+ sprintf(buf, "test-uhid-device-%d", rand_nb);
+
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_CREATE;
+ strcpy((char *)ev.u.create.name, buf);
+ ev.u.create.rd_data = rdesc;
+ ev.u.create.rd_size = sizeof(rdesc);
+ ev.u.create.bus = BUS_USB;
+ ev.u.create.vendor = 0x0001;
+ ev.u.create.product = 0x0a37;
+ ev.u.create.version = 0;
+ ev.u.create.country = 0;
+
+ sprintf(buf, "%d", rand_nb);
+ strcpy((char *)ev.u.create.phys, buf);
+
+ return uhid_write(_metadata, fd, &ev);
+}
+
+static void uhid_destroy(struct __test_metadata *_metadata, int fd)
+{
+ struct uhid_event ev;
+
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_DESTROY;
+
+ uhid_write(_metadata, fd, &ev);
+}
+
+static int uhid_event(struct __test_metadata *_metadata, int fd)
+{
+ struct uhid_event ev, answer;
+ ssize_t ret;
+
+ memset(&ev, 0, sizeof(ev));
+ ret = read(fd, &ev, sizeof(ev));
+ if (ret == 0) {
+ UHID_LOG("Read HUP on uhid-cdev");
+ return -EFAULT;
+ } else if (ret < 0) {
+ UHID_LOG("Cannot read uhid-cdev: %m");
+ return -errno;
+ } else if (ret != sizeof(ev)) {
+ UHID_LOG("Invalid size read from uhid-dev: %zd != %zu",
+ ret, sizeof(ev));
+ return -EFAULT;
+ }
+
+ switch (ev.type) {
+ case UHID_START:
+ pthread_mutex_lock(&uhid_started_mtx);
+ pthread_cond_signal(&uhid_started);
+ pthread_mutex_unlock(&uhid_started_mtx);
+
+ UHID_LOG("UHID_START from uhid-dev");
+ break;
+ case UHID_STOP:
+ uhid_stopped = true;
+
+ UHID_LOG("UHID_STOP from uhid-dev");
+ break;
+ case UHID_OPEN:
+ UHID_LOG("UHID_OPEN from uhid-dev");
+ break;
+ case UHID_CLOSE:
+ UHID_LOG("UHID_CLOSE from uhid-dev");
+ break;
+ case UHID_OUTPUT:
+ UHID_LOG("UHID_OUTPUT from uhid-dev");
+ break;
+ case UHID_GET_REPORT:
+ UHID_LOG("UHID_GET_REPORT from uhid-dev");
+
+ 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(_metadata, fd, &answer);
+
+ break;
+ case UHID_SET_REPORT:
+ UHID_LOG("UHID_SET_REPORT from uhid-dev");
+ break;
+ default:
+ TH_LOG("Invalid event from uhid-dev: %u", ev.type);
+ }
+
+ return 0;
+}
+
+struct uhid_thread_args {
+ int fd;
+ struct __test_metadata *_metadata;
+};
+static void *uhid_read_events_thread(void *arg)
+{
+ struct uhid_thread_args *args = (struct uhid_thread_args *)arg;
+ struct __test_metadata *_metadata = args->_metadata;
+ struct pollfd pfds[1];
+ int fd = args->fd;
+ int ret = 0;
+
+ pfds[0].fd = fd;
+ pfds[0].events = POLLIN;
+
+ uhid_stopped = false;
+
+ while (!uhid_stopped) {
+ ret = poll(pfds, 1, 100);
+ if (ret < 0) {
+ TH_LOG("Cannot poll for fds: %m");
+ break;
+ }
+ if (pfds[0].revents & POLLIN) {
+ ret = uhid_event(_metadata, fd);
+ if (ret)
+ break;
+ }
+ }
+
+ return (void *)(long)ret;
+}
+
+static int uhid_start_listener(struct __test_metadata *_metadata, pthread_t *tid, int uhid_fd)
+{
+ struct uhid_thread_args args = {
+ .fd = uhid_fd,
+ ._metadata = _metadata,
+ };
+ int err;
+
+ pthread_mutex_lock(&uhid_started_mtx);
+ err = pthread_create(tid, NULL, uhid_read_events_thread, (void *)&args);
+ ASSERT_EQ(0, err) {
+ TH_LOG("Could not start the uhid thread: %d", err);
+ pthread_mutex_unlock(&uhid_started_mtx);
+ close(uhid_fd);
+ return -EIO;
+ }
+ pthread_cond_wait(&uhid_started, &uhid_started_mtx);
+ pthread_mutex_unlock(&uhid_started_mtx);
+
+ return 0;
+}
+
+static int uhid_send_event(struct __test_metadata *_metadata, int fd, __u8 *buf, size_t size)
+{
+ struct uhid_event ev;
+
+ if (size > sizeof(ev.u.input.data))
+ return -E2BIG;
+
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_INPUT2;
+ ev.u.input2.size = size;
+
+ memcpy(ev.u.input2.data, buf, size);
+
+ return uhid_write(_metadata, fd, &ev);
+}
+
+static int setup_uhid(struct __test_metadata *_metadata, int rand_nb)
+{
+ int fd;
+ const char *path = "/dev/uhid";
+ int ret;
+
+ fd = open(path, O_RDWR | O_CLOEXEC);
+ ASSERT_GE(fd, 0) TH_LOG("open uhid-cdev failed; %d", fd);
+
+ ret = uhid_create(_metadata, fd, rand_nb);
+ ASSERT_EQ(0, ret) {
+ TH_LOG("create uhid device failed: %d", ret);
+ close(fd);
+ }
+
+ return fd;
+}
+
+static bool match_sysfs_device(int dev_id, const char *workdir, struct dirent *dir)
+{
+ const char *target = "0003:0001:0A37.*";
+ char phys[512];
+ char uevent[1024];
+ char temp[512];
+ int fd, nread;
+ bool found = false;
+
+ if (fnmatch(target, dir->d_name, 0))
+ return false;
+
+ /* we found the correct VID/PID, now check for phys */
+ sprintf(uevent, "%s/%s/uevent", workdir, dir->d_name);
+
+ fd = open(uevent, O_RDONLY | O_NONBLOCK);
+ if (fd < 0)
+ return false;
+
+ sprintf(phys, "PHYS=%d", dev_id);
+
+ nread = read(fd, temp, ARRAY_SIZE(temp));
+ if (nread > 0 && (strstr(temp, phys)) != NULL)
+ found = true;
+
+ close(fd);
+
+ return found;
+}
+
+static int get_hid_id(int dev_id)
+{
+ const char *workdir = "/sys/devices/virtual/misc/uhid";
+ const char *str_id;
+ DIR *d;
+ struct dirent *dir;
+ int found = -1, attempts = 3;
+
+ /* it would be nice to be able to use nftw, but the no_alu32 target doesn't support it */
+
+ while (found < 0 && attempts > 0) {
+ attempts--;
+ d = opendir(workdir);
+ if (d) {
+ while ((dir = readdir(d)) != NULL) {
+ if (!match_sysfs_device(dev_id, workdir, dir))
+ continue;
+
+ str_id = dir->d_name + sizeof("0003:0001:0A37.");
+ found = (int)strtol(str_id, NULL, 16);
+
+ break;
+ }
+ closedir(d);
+ }
+ if (found < 0)
+ usleep(100000);
+ }
+
+ return found;
+}
+
+static int get_hidraw(int dev_id)
+{
+ const char *workdir = "/sys/devices/virtual/misc/uhid";
+ char sysfs[1024];
+ DIR *d, *subd;
+ struct dirent *dir, *subdir;
+ int i, found = -1;
+
+ /* retry 5 times in case the system is loaded */
+ for (i = 5; i > 0; i--) {
+ usleep(10);
+ d = opendir(workdir);
+
+ if (!d)
+ continue;
+
+ while ((dir = readdir(d)) != NULL) {
+ if (!match_sysfs_device(dev_id, workdir, dir))
+ continue;
+
+ sprintf(sysfs, "%s/%s/hidraw", workdir, dir->d_name);
+
+ subd = opendir(sysfs);
+ if (!subd)
+ continue;
+
+ while ((subdir = readdir(subd)) != NULL) {
+ if (fnmatch("hidraw*", subdir->d_name, 0))
+ continue;
+
+ found = atoi(subdir->d_name + strlen("hidraw"));
+ }
+
+ closedir(subd);
+
+ if (found > 0)
+ break;
+ }
+ closedir(d);
+ }
+
+ return found;
+}
+
+static int open_hidraw(int dev_id)
+{
+ int hidraw_number;
+ char hidraw_path[64] = { 0 };
+
+ hidraw_number = get_hidraw(dev_id);
+ if (hidraw_number < 0)
+ return hidraw_number;
+
+ /* open hidraw node to check the other side of the pipe */
+ sprintf(hidraw_path, "/dev/hidraw%d", hidraw_number);
+ return open(hidraw_path, O_RDWR | O_NONBLOCK);
+}
+
+FIXTURE(hid_bpf) {
+ int dev_id;
+ int uhid_fd;
+ int hidraw_fd;
+ int hid_id;
+ pthread_t tid;
+ struct hid *skel;
+ int 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;
+
+ for (i = 0; i < ARRAY_SIZE(self->hid_links); i++) {
+ if (self->hid_links[i])
+ close(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)
+{
+ int attach_fd, err = -EINVAL;
+ struct attach_prog_args args = {
+ .retval = -1,
+ };
+ DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
+ .ctx_in = &args,
+ .ctx_size_in = sizeof(args),
+ );
+
+ 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;
+
+ 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);
+ }
+
+ err = hid__load(self->skel);
+ ASSERT_OK(err) TH_LOG("hid_skel_load failed: %d", err);
+
+ attach_fd = bpf_program__fd(self->skel->progs.attach_prog);
+ ASSERT_GE(attach_fd, 0) TH_LOG("locate attach_prog: %d", attach_fd);
+
+ for (int i = 0; i < progs_count; i++) {
+ struct bpf_program *prog;
+
+ 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);
+
+ args.prog_fd = bpf_program__fd(prog);
+ args.hid = self->hid_id;
+ args.insert_head = programs[i].insert_head;
+ err = bpf_prog_test_run_opts(attach_fd, &tattr);
+ ASSERT_GE(args.retval, 0)
+ TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+
+ self->hid_links[i] = args.retval;
+ }
+
+ 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);
+}
+
+/*
+ * 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" },
+ };
+ __u8 buf[10] = {0};
+ int err, link;
+
+ LOAD_PROGRAMS(progs);
+
+ link = self->hid_links[0];
+ ASSERT_GT(link, 0) TH_LOG("HID-BPF link not created");
+
+ /* 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, 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");
+}
+
+/*
+ * 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.
+ */
+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);
+}
+
+/*
+ * 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;
+}
+
+static void __attribute__((constructor)) __constructor_order_last(void)
+{
+ if (!__constructor_order)
+ __constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
+}
+
+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);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.