executor: split out Linux specific USB code

1 files changed, 27 insertions, 533 deletions

diff --git a/executor/common_usb.h b/executor/common_usb.h
index 29196c2d0..06cb36967 100644
--- a/executor/common_usb.h
+++ b/executor/common_usb.h
@@ -1,12 +1,13 @@
-// Copyright 2019 syzkaller project authors. All rights reserved.
+// Copyright 2020 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
 
 // This file is shared between executor and csource package.
 
-// Implementation of syz_usb_* pseudo-syscalls.
+// Generic parts of implementation of syz_usb_* pseudo-syscalls.
 
 #define USB_MAX_IFACE_NUM 4
 #define USB_MAX_EP_NUM 32
+#define USB_MAX_FDS 6
 
 struct usb_iface_index {
 	struct usb_interface_descriptor* iface;
@@ -28,6 +29,14 @@ struct usb_device_index {
 	int iface_cur;
 };
 
+struct usb_info {
+	int fd;
+	struct usb_device_index index;
+};
+
+static struct usb_info usb_devices[USB_MAX_FDS];
+static int usb_devices_num;
+
 static bool parse_usb_descriptor(const char* buffer, size_t length, struct usb_device_index* index)
 {
 	if (length < sizeof(*index->dev) + sizeof(*index->config))
@@ -76,127 +85,10 @@ static bool parse_usb_descriptor(const char* buffer, size_t length, struct usb_d
 	return true;
 }
 
-#define UDC_NAME_LENGTH_MAX 128
-
-struct usb_raw_init {
-	__u8 driver_name[UDC_NAME_LENGTH_MAX];
-	__u8 device_name[UDC_NAME_LENGTH_MAX];
-	__u8 speed;
-};
-
-enum usb_raw_event_type {
-	USB_RAW_EVENT_INVALID = 0,
-	USB_RAW_EVENT_CONNECT = 1,
-	USB_RAW_EVENT_CONTROL = 2,
-};
-
-struct usb_raw_event {
-	__u32 type;
-	__u32 length;
-	__u8 data[0];
-};
-
-struct usb_raw_ep_io {
-	__u16 ep;
-	__u16 flags;
-	__u32 length;
-	__u8 data[0];
-};
-
-#define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init)
-#define USB_RAW_IOCTL_RUN _IO('U', 1)
-#define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event)
-#define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io)
-#define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io)
-#define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor)
-#define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32)
-#define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io)
-#define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io)
-#define USB_RAW_IOCTL_CONFIGURE _IO('U', 9)
-#define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32)
-
-static int usb_raw_open()
-{
-	return open("/dev/raw-gadget", O_RDWR);
-}
-
-static int usb_raw_init(int fd, uint32 speed, const char* driver, const char* device)
-{
-	struct usb_raw_init arg;
-	strncpy((char*)&arg.driver_name[0], driver, sizeof(arg.driver_name));
-	strncpy((char*)&arg.device_name[0], device, sizeof(arg.device_name));
-	arg.speed = speed;
-	return ioctl(fd, USB_RAW_IOCTL_INIT, &arg);
-}
-
-static int usb_raw_run(int fd)
-{
-	return ioctl(fd, USB_RAW_IOCTL_RUN, 0);
-}
-
-static int usb_raw_event_fetch(int fd, struct usb_raw_event* event)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EVENT_FETCH, event);
-}
-
-static int usb_raw_ep0_write(int fd, struct usb_raw_ep_io* io)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EP0_WRITE, io);
-}
-
-static int usb_raw_ep0_read(int fd, struct usb_raw_ep_io* io)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EP0_READ, io);
-}
-
-#if SYZ_EXECUTOR || __NR_syz_usb_ep_write
-static int usb_raw_ep_write(int fd, struct usb_raw_ep_io* io)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EP_WRITE, io);
-}
-#endif
-
-#if SYZ_EXECUTOR || __NR_syz_usb_ep_read
-static int usb_raw_ep_read(int fd, struct usb_raw_ep_io* io)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EP_READ, io);
-}
-#endif
-
-static int usb_raw_ep_enable(int fd, struct usb_endpoint_descriptor* desc)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EP_ENABLE, desc);
-}
-
-static int usb_raw_ep_disable(int fd, int ep)
-{
-	return ioctl(fd, USB_RAW_IOCTL_EP_DISABLE, ep);
-}
-
-static int usb_raw_configure(int fd)
-{
-	return ioctl(fd, USB_RAW_IOCTL_CONFIGURE, 0);
-}
-
-static int usb_raw_vbus_draw(int fd, uint32 power)
-{
-	return ioctl(fd, USB_RAW_IOCTL_VBUS_DRAW, power);
-}
-
-#define MAX_USB_FDS 6
-
-struct usb_info {
-	int fd;
-	struct usb_device_index index;
-};
-
-static struct usb_info usb_devices[MAX_USB_FDS];
-static int usb_devices_num;
-
 static struct usb_device_index* add_usb_index(int fd, const char* dev, size_t dev_len)
 {
 	int i = __atomic_fetch_add(&usb_devices_num, 1, __ATOMIC_RELAXED);
-	if (i >= MAX_USB_FDS)
+	if (i >= USB_MAX_FDS)
 		return NULL;
 
 	int rv = 0;
@@ -211,7 +103,7 @@ static struct usb_device_index* add_usb_index(int fd, const char* dev, size_t de
 static struct usb_device_index* lookup_usb_index(int fd)
 {
 	int i;
-	for (i = 0; i < MAX_USB_FDS; i++) {
+	for (i = 0; i < USB_MAX_FDS; i++) {
 		if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd) {
 			return &usb_devices[i].index;
 		}
@@ -219,76 +111,6 @@ static struct usb_device_index* lookup_usb_index(int fd)
 	return NULL;
 }
 
-#if SYZ_EXECUTOR || __NR_syz_usb_control_io
-static int lookup_interface(int fd, uint8 bInterfaceNumber, uint8 bAlternateSetting)
-{
-	struct usb_device_index* index = lookup_usb_index(fd);
-	int i;
-
-	if (!index)
-		return -1;
-
-	for (i = 0; i < index->ifaces_num; i++) {
-		if (index->ifaces[i].bInterfaceNumber == bInterfaceNumber &&
-		    index->ifaces[i].bAlternateSetting == bAlternateSetting)
-			return i;
-	}
-	return -1;
-}
-#endif
-
-static void set_interface(int fd, int n)
-{
-	struct usb_device_index* index = lookup_usb_index(fd);
-	int ep;
-
-	if (!index)
-		return;
-
-	if (index->iface_cur >= 0 && index->iface_cur < index->ifaces_num) {
-		for (ep = 0; ep < index->ifaces[index->iface_cur].eps_num; ep++) {
-			int rv = usb_raw_ep_disable(fd, ep);
-			if (rv < 0) {
-				debug("set_interface: failed to disable endpoint %d\n", ep);
-			} else {
-				debug("set_interface: endpoint %d disabled\n", ep);
-			}
-		}
-	}
-	if (n >= 0 && n < index->ifaces_num) {
-		for (ep = 0; ep < index->ifaces[n].eps_num; ep++) {
-			int rv = usb_raw_ep_enable(fd, &index->ifaces[n].eps[ep]);
-			if (rv < 0) {
-				debug("set_interface: failed to enable endpoint %d\n", ep);
-			} else {
-				debug("set_interface: endpoint %d enabled as %d\n", ep, rv);
-			}
-		}
-		index->iface_cur = n;
-	}
-}
-
-static int configure_device(int fd)
-{
-	struct usb_device_index* index = lookup_usb_index(fd);
-
-	if (!index)
-		return -1;
-
-	int rv = usb_raw_vbus_draw(fd, index->bMaxPower);
-	if (rv < 0) {
-		debug("configure_device: usb_raw_vbus_draw failed with %d\n", rv);
-		return rv;
-	}
-	rv = usb_raw_configure(fd);
-	if (rv < 0) {
-		debug("configure_device: usb_raw_configure failed with %d\n", rv);
-		return rv;
-	}
-	set_interface(fd, 0);
-	return 0;
-}
-
 #if USB_DEBUG
 
 #include <linux/hid.h>
@@ -708,19 +530,6 @@ static void analyze_control_request(int fd, struct usb_ctrlrequest* ctrl)
 
 #endif // USB_DEBUG
 
-#define USB_MAX_PACKET_SIZE 4096
-
-struct usb_raw_control_event {
-	struct usb_raw_event inner;
-	struct usb_ctrlrequest ctrl;
-	char data[USB_MAX_PACKET_SIZE];
-};
-
-struct usb_raw_ep_io_data {
-	struct usb_raw_ep_io inner;
-	char data[USB_MAX_PACKET_SIZE];
-};
-
 struct vusb_connect_string_descriptor {
 	uint32 len;
 	char* str;
@@ -745,7 +554,8 @@ static const char default_lang_id[] = {
     0x09, 0x04 // English (United States)
 };
 
-static bool lookup_connect_response_in(int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl,
+static bool lookup_connect_response_in(int fd, const struct vusb_connect_descriptors* descs,
+				       const struct usb_ctrlrequest* ctrl,
 				       char** response_data, uint32* response_length)
 {
 	struct usb_device_index* index = lookup_usb_index(fd);
@@ -822,6 +632,9 @@ static bool lookup_connect_response_in(int fd, const struct vusb_connect_descrip
 	return false;
 }
 
+typedef bool (*lookup_connect_out_response_t)(int fd, const struct vusb_connect_descriptors* descs,
+					      const struct usb_ctrlrequest* ctrl, bool* done);
+
 #if SYZ_EXECUTOR || __NR_syz_usb_connect
 static bool lookup_connect_response_out_generic(int fd, const struct vusb_connect_descriptors* descs,
 						const struct usb_ctrlrequest* ctrl, bool* done)
@@ -841,7 +654,7 @@ static bool lookup_connect_response_out_generic(int fd, const struct vusb_connec
 	fail("lookup_connect_response_out: unknown request");
 	return false;
 }
-#endif
+#endif // SYZ_EXECUTOR || __NR_syz_usb_connect
 
 #if SYZ_EXECUTOR || __NR_syz_usb_connect_ath9k
 
@@ -878,172 +691,10 @@ static bool lookup_connect_response_out_ath9k(int fd, const struct vusb_connect_
 	return false;
 }
 
-#endif
-
-typedef bool (*lookup_connect_response_t)(int fd, const struct vusb_connect_descriptors* descs,
-					  const struct usb_ctrlrequest* ctrl, bool* done);
-
-static volatile long syz_usb_connect_impl(uint64 speed, uint64 dev_len, const char* dev,
-					  const struct vusb_connect_descriptors* descs, lookup_connect_response_t lookup_connect_response_out)
-{
-	debug("syz_usb_connect: dev: %p\n", dev);
-	if (!dev) {
-		debug("syz_usb_connect: dev is null\n");
-		return -1;
-	}
-
-	debug("syz_usb_connect: device data:\n");
-	debug_dump_data(dev, dev_len);
-
-	int fd = usb_raw_open();
-	if (fd < 0) {
-		debug("syz_usb_connect: usb_raw_open failed with %d\n", fd);
-		return fd;
-	}
-	if (fd >= MAX_FDS) {
-		close(fd);
-		debug("syz_usb_connect: too many open fds\n");
-		return -1;
-	}
-	debug("syz_usb_connect: usb_raw_open success\n");
-
-	struct usb_device_index* index = add_usb_index(fd, dev, dev_len);
-	if (!index) {
-		debug("syz_usb_connect: add_usb_index failed\n");
-		return -1;
-	}
-	debug("syz_usb_connect: add_usb_index success\n");
-
-#if USB_DEBUG
-	NONFAILING(analyze_usb_device(index));
-#endif
-
-	// TODO: consider creating two dummy_udc's per proc to increace the chance of
-	// triggering interaction between multiple USB devices within the same program.
-	char device[32];
-	sprintf(&device[0], "dummy_udc.%llu", procid);
-	int rv = usb_raw_init(fd, speed, "dummy_udc", &device[0]);
-	if (rv < 0) {
-		debug("syz_usb_connect: usb_raw_init failed with %d\n", rv);
-		return rv;
-	}
-	debug("syz_usb_connect: usb_raw_init success\n");
-
-	rv = usb_raw_run(fd);
-	if (rv < 0) {
-		debug("syz_usb_connect: usb_raw_run failed with %d\n", rv);
-		return rv;
-	}
-	debug("syz_usb_connect: usb_raw_run success\n");
-
-	bool done = false;
-	while (!done) {
-		struct usb_raw_control_event event;
-		event.inner.type = 0;
-		event.inner.length = sizeof(event.ctrl);
-		rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event);
-		if (rv < 0) {
-			debug("syz_usb_connect: usb_raw_event_fetch failed with %d\n", rv);
-			return rv;
-		}
-		if (event.inner.type != USB_RAW_EVENT_CONTROL)
-			continue;
-
-		debug("syz_usb_connect: bReqType: 0x%x (%s), bReq: 0x%x, wVal: 0x%x, wIdx: 0x%x, wLen: %d\n",
-		      event.ctrl.bRequestType, (event.ctrl.bRequestType & USB_DIR_IN) ? "IN" : "OUT",
-		      event.ctrl.bRequest, event.ctrl.wValue, event.ctrl.wIndex, event.ctrl.wLength);
-
-#if USB_DEBUG
-		analyze_control_request(fd, &event.ctrl);
-#endif
-
-		char* response_data = NULL;
-		uint32 response_length = 0;
-
-		if (event.ctrl.bRequestType & USB_DIR_IN) {
-			bool response_found = false;
-			NONFAILING(response_found = lookup_connect_response_in(fd, descs, &event.ctrl, &response_data, &response_length));
-			if (!response_found) {
-				debug("syz_usb_connect: unknown control IN request\n");
-				return -1;
-			}
-		} else {
-			if (!lookup_connect_response_out(fd, descs, &event.ctrl, &done)) {
-				debug("syz_usb_connect: unknown control OUT request\n");
-				return -1;
-			}
-			response_data = NULL;
-			response_length = event.ctrl.wLength;
-		}
-
-		if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD &&
-		    event.ctrl.bRequest == USB_REQ_SET_CONFIGURATION) {
-			rv = configure_device(fd);
-			if (rv < 0) {
-				debug("syz_usb_connect: configure_device failed with %d\n", rv);
-				return rv;
-			}
-		}
-
-		struct usb_raw_ep_io_data response;
-		response.inner.ep = 0;
-		response.inner.flags = 0;
-		if (response_length > sizeof(response.data))
-			response_length = 0;
-		if (event.ctrl.wLength < response_length)
-			response_length = event.ctrl.wLength;
-		response.inner.length = response_length;
-		if (response_data)
-			memcpy(&response.data[0], response_data, response_length);
-		else
-			memset(&response.data[0], 0, response_length);
-
-		if (event.ctrl.bRequestType & USB_DIR_IN) {
-			debug("syz_usb_connect: writing %d bytes\n", response.inner.length);
-			rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response);
-		} else {
-			rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response);
-			debug("syz_usb_connect: read %d bytes\n", response.inner.length);
-			debug_dump_data(&event.data[0], response.inner.length);
-		}
-		if (rv < 0) {
-			debug("syz_usb_connect: usb_raw_ep0_read/write failed with %d\n", rv);
-			return rv;
-		}
-	}
-
-	sleep_ms(200);
-
-	debug("syz_usb_connect: configured\n");
-
-	return fd;
-}
-
-#if SYZ_EXECUTOR || __NR_syz_usb_connect
-static volatile long syz_usb_connect(volatile long a0, volatile long a1, volatile long a2, volatile long a3)
-{
-	uint64 speed = a0;
-	uint64 dev_len = a1;
-	const char* dev = (const char*)a2;
-	const struct vusb_connect_descriptors* descs = (const struct vusb_connect_descriptors*)a3;
-
-	return syz_usb_connect_impl(speed, dev_len, dev, descs, &lookup_connect_response_out_generic);
-}
-#endif
-
-#if SYZ_EXECUTOR || __NR_syz_usb_connect_ath9k
-static volatile long syz_usb_connect_ath9k(volatile long a0, volatile long a1, volatile long a2, volatile long a3)
-{
-	uint64 speed = a0;
-	uint64 dev_len = a1;
-	const char* dev = (const char*)a2;
-	const struct vusb_connect_descriptors* descs = (const struct vusb_connect_descriptors*)a3;
-
-	return syz_usb_connect_impl(speed, dev_len, dev, descs, &lookup_connect_response_out_ath9k);
-}
-#endif
+#endif // SYZ_EXECUTOR || __NR_syz_usb_connect_ath9k
 
 #if SYZ_EXECUTOR || __NR_syz_usb_control_io
+
 struct vusb_descriptor {
 	uint8 req_type;
 	uint8 desc_type;
@@ -1134,167 +785,10 @@ static bool lookup_control_response(const struct vusb_descriptors* descs, const
 	return false;
 }
 
-static volatile long syz_usb_control_io(volatile long a0, volatile long a1, volatile long a2)
-{
-	int fd = a0;
-	const struct vusb_descriptors* descs = (const struct vusb_descriptors*)a1;
-	const struct vusb_responses* resps = (const struct vusb_responses*)a2;
-
-	struct usb_raw_control_event event;
-	event.inner.type = 0;
-	event.inner.length = USB_MAX_PACKET_SIZE;
-	int rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event);
-	if (rv < 0) {
-		debug("syz_usb_control_io: usb_raw_ep0_read failed with %d\n", rv);
-		return rv;
-	}
-	if (event.inner.type != USB_RAW_EVENT_CONTROL) {
-		debug("syz_usb_control_io: wrong event type: %d\n", (int)event.inner.type);
-		return -1;
-	}
-
-	debug("syz_usb_control_io: bReqType: 0x%x (%s), bReq: 0x%x, wVal: 0x%x, wIdx: 0x%x, wLen: %d\n",
-	      event.ctrl.bRequestType, (event.ctrl.bRequestType & USB_DIR_IN) ? "IN" : "OUT",
-	      event.ctrl.bRequest, event.ctrl.wValue, event.ctrl.wIndex, event.ctrl.wLength);
-
-#if USB_DEBUG
-	analyze_control_request(fd, &event.ctrl);
-#endif
-
-	bool response_found = false;
-	char* response_data = NULL;
-	uint32 response_length = 0;
-
-	if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) {
-		NONFAILING(response_found = lookup_control_response(descs, resps, &event.ctrl, &response_data, &response_length));
-		if (!response_found) {
-			debug("syz_usb_control_io: unknown control IN request\n");
-			return -1;
-		}
-	} else {
-		if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD ||
-		    event.ctrl.bRequest == USB_REQ_SET_INTERFACE) {
-			int iface_num = event.ctrl.wIndex;
-			int alt_set = event.ctrl.wValue;
-			debug("syz_usb_control_io: setting interface (%d, %d)\n", iface_num, alt_set);
-			int iface_index = lookup_interface(fd, iface_num, alt_set);
-			if (iface_index < 0) {
-				debug("syz_usb_control_io: interface (%d, %d) not found\n", iface_num, alt_set);
-			} else {
-				set_interface(fd, iface_index);
-				debug("syz_usb_control_io: interface (%d, %d) set\n", iface_num, alt_set);
-			}
-		}
-
-		response_length = event.ctrl.wLength;
-	}
-
-	struct usb_raw_ep_io_data response;
-	response.inner.ep = 0;
-	response.inner.flags = 0;
-	if (response_length > sizeof(response.data))
-		response_length = 0;
-	if (event.ctrl.wLength < response_length)
-		response_length = event.ctrl.wLength;
-	if ((event.ctrl.bRequestType & USB_DIR_IN) && !event.ctrl.wLength) {
-		// Something fishy is going on, try to read more data.
-		response_length = USB_MAX_PACKET_SIZE;
-	}
-	response.inner.length = response_length;
-	if (response_data)
-		memcpy(&response.data[0], response_data, response_length);
-	else
-		memset(&response.data[0], 0, response_length);
-
-	if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) {
-		debug("syz_usb_control_io: writing %d bytes\n", response.inner.length);
-		debug_dump_data(&response.data[0], response.inner.length);
-		rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response);
-	} else {
-		rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response);
-		debug("syz_usb_control_io: read %d bytes\n", response.inner.length);
-		debug_dump_data(&response.data[0], response.inner.length);
-	}
-	if (rv < 0) {
-		debug("syz_usb_control_io: usb_raw_ep0_read/write failed with %d\n", rv);
-		return rv;
-	}
+#endif // SYZ_EXECUTOR || __NR_syz_usb_control_io
 
-	sleep_ms(200);
-
-	return 0;
-}
-#endif
-
-#if SYZ_EXECUTOR || __NR_syz_usb_ep_write
-static volatile long syz_usb_ep_write(volatile long a0, volatile long a1, volatile long a2, volatile long a3)
-{
-	int fd = a0;
-	uint16 ep = a1;
-	uint32 len = a2;
-	char* data = (char*)a3;
-
-	struct usb_raw_ep_io_data io_data;
-	io_data.inner.ep = ep;
-	io_data.inner.flags = 0;
-	if (len > sizeof(io_data.data))
-		len = sizeof(io_data.data);
-	io_data.inner.length = len;
-	NONFAILING(memcpy(&io_data.data[0], data, len));
-
-	int rv = usb_raw_ep_write(fd, (struct usb_raw_ep_io*)&io_data);
-	if (rv < 0) {
-		debug("syz_usb_ep_write: usb_raw_ep_write failed with %d\n", rv);
-		return rv;
-	}
-
-	sleep_ms(200);
-
-	return 0;
-}
-#endif
-
-#if SYZ_EXECUTOR || __NR_syz_usb_ep_read
-static volatile long syz_usb_ep_read(volatile long a0, volatile long a1, volatile long a2, volatile long a3)
-{
-	int fd = a0;
-	uint16 ep = a1;
-	uint32 len = a2;
-	char* data = (char*)a3;
-
-	struct usb_raw_ep_io_data io_data;
-	io_data.inner.ep = ep;
-	io_data.inner.flags = 0;
-	if (len > sizeof(io_data.data))
-		len = sizeof(io_data.data);
-	io_data.inner.length = len;
-
-	int rv = usb_raw_ep_read(fd, (struct usb_raw_ep_io*)&io_data);
-	if (rv < 0) {
-		debug("syz_usb_ep_read: usb_raw_ep_read failed with %d\n", rv);
-		return rv;
-	}
-
-	NONFAILING(memcpy(&data[0], &io_data.data[0], io_data.inner.length));
-
-	debug("syz_usb_ep_read: received data:\n");
-	debug_dump_data(&io_data.data[0], io_data.inner.length);
-
-	sleep_ms(200);
-
-	return 0;
-}
-#endif
-
-#if SYZ_EXECUTOR || __NR_syz_usb_disconnect
-static volatile long syz_usb_disconnect(volatile long a0)
-{
-	int fd = a0;
-
-	int rv = close(fd);
-
-	sleep_ms(200);
-
-	return rv;
-}
-#endif
+#if GOOS_linux
+#include "common_usb_linux.h"
+#else
+#error "unknown OS"
+#endif // GOOS_linux