divide error in alauda_transport

[Shichao Lai <phyhac@xxxxxxxxx>]

Hello Dear maintainer!

A new bug was found by our modified syzkaller.

Kernel Version: v6.9-rc7

Reproducer & Kernel config: attachment

=================

divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 10871 Comm: usb-storage Not tainted 6.9.0-rc7 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline]
RIP: 0010:alauda_transport+0xd34/0x3280 drivers/usb/storage/alauda.c:1184
Code: 01 e8 85 ed 48 89 44 24 58 0f 84 00 02 00 00 89 6c 24 10 44 8b 74 24 18 e8 29 6e 0a fd 31 d2 4c 89 ff 44 89 f0 44 89 74 24 18 <f7> 74 24 78 41 89 c4 89 d5 44 89 e6 e8 8b c2 ff ff 0f b7 5c 24 50
RSP: 0018:ffffc9000b24fa68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff844799be
RDX: 0000000000000000 RSI: ffffffff844799f7 RDI: ffff88813bc6ccc0
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffff888115508b00 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88813bc6ccc0
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e17750658 CR3: 000000010d3c8000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
 <TASK>
 usb_stor_invoke_transport+0xed/0x1670 drivers/usb/storage/transport.c:611
 usb_stor_control_thread+0x5d3/0xa80 drivers/usb/storage/usb.c:368
 kthread+0x2c7/0x3b0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline]
RIP: 0010:alauda_transport+0xd34/0x3280 drivers/usb/storage/alauda.c:1184
Code: 01 e8 85 ed 48 89 44 24 58 0f 84 00 02 00 00 89 6c 24 10 44 8b 74 24 18 e8 29 6e 0a fd 31 d2 4c 89 ff 44 89 f0 44 89 74 24 18 <f7> 74 24 78 41 89 c4 89 d5 44 89 e6 e8 8b c2 ff ff 0f b7 5c 24 50
RSP: 0018:ffffc9000b24fa68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff844799be
RDX: 0000000000000000 RSI: ffffffff844799f7 RDI: ffff88813bc6ccc0
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffff888115508b00 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88813bc6ccc0
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e17750658 CR3: 000000010d3c8000 CR4: 0000000000750ef0
PKRU: 55555554
----------------
Code disassembly (best guess):
   0:   01 e8                   add    %ebp,%eax
   2:   85 ed                   test   %ebp,%ebp
   4:   48 89 44 24 58          mov    %rax,0x58(%rsp)
   9:   0f 84 00 02 00 00       je     0x20f
   f:   89 6c 24 10             mov    %ebp,0x10(%rsp)
  13:   44 8b 74 24 18          mov    0x18(%rsp),%r14d
  18:   e8 29 6e 0a fd          call   0xfd0a6e46
  1d:   31 d2                   xor    %edx,%edx
  1f:   4c 89 ff                mov    %r15,%rdi
  22:   44 89 f0                mov    %r14d,%eax
  25:   44 89 74 24 18          mov    %r14d,0x18(%rsp)
* 2a:   f7 74 24 78             divl   0x78(%rsp) <-- trapping instruction
  2e:   41 89 c4                mov    %eax,%r12d
  31:   89 d5                   mov    %edx,%ebp
  33:   44 89 e6                mov    %r12d,%esi
  36:   e8 8b c2 ff ff          call   0xffffc2c6
  3b:   0f b7 5c 24 50          movzwl 0x50(%rsp),%ebx

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE 

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <linux/usb/ch9.h>

static unsigned long long procid;

static void sleep_ms(uint64_t ms)
{
	usleep(ms * 1000);
}

#define MAX_FDS 30

#define USB_MAX_IFACE_NUM 4
#define USB_MAX_EP_NUM 32
#define USB_MAX_FDS 6

struct usb_endpoint_index {
	struct usb_endpoint_descriptor desc;
	int handle;
};

struct usb_iface_index {
	struct usb_interface_descriptor* iface;
	uint8_t bInterfaceNumber;
	uint8_t bAlternateSetting;
	uint8_t bInterfaceClass;
	struct usb_endpoint_index eps[USB_MAX_EP_NUM];
	int eps_num;
};

struct usb_device_index {
	struct usb_device_descriptor* dev;
	struct usb_config_descriptor* config;
	uint8_t bDeviceClass;
	uint8_t bMaxPower;
	int config_length;
	struct usb_iface_index ifaces[USB_MAX_IFACE_NUM];
	int ifaces_num;
	int iface_cur;
};

struct usb_info {
	int fd;
	struct usb_device_index index;
};

static struct usb_info usb_devices[USB_MAX_FDS];

static struct usb_device_index* lookup_usb_index(int fd)
{
	for (int i = 0; i < USB_MAX_FDS; i++) {
		if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd)
			return &usb_devices[i].index;
	}
	return NULL;
}

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))
		return false;
	memset(index, 0, sizeof(*index));
	index->dev = (struct usb_device_descriptor*)buffer;
	index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev));
	index->bDeviceClass = index->dev->bDeviceClass;
	index->bMaxPower = index->config->bMaxPower;
	index->config_length = length - sizeof(*index->dev);
	index->iface_cur = -1;
	size_t offset = 0;
	while (true) {
		if (offset + 1 >= length)
			break;
		uint8_t desc_length = buffer[offset];
		uint8_t desc_type = buffer[offset + 1];
		if (desc_length <= 2)
			break;
		if (offset + desc_length > length)
			break;
		if (desc_type == USB_DT_INTERFACE && index->ifaces_num < USB_MAX_IFACE_NUM) {
			struct usb_interface_descriptor* iface = (struct usb_interface_descriptor*)(buffer + offset);
			index->ifaces[index->ifaces_num].iface = iface;
			index->ifaces[index->ifaces_num].bInterfaceNumber = iface->bInterfaceNumber;
			index->ifaces[index->ifaces_num].bAlternateSetting = iface->bAlternateSetting;
			index->ifaces[index->ifaces_num].bInterfaceClass = iface->bInterfaceClass;
			index->ifaces_num++;
		}
		if (desc_type == USB_DT_ENDPOINT && index->ifaces_num > 0) {
			struct usb_iface_index* iface = &index->ifaces[index->ifaces_num - 1];
			if (iface->eps_num < USB_MAX_EP_NUM) {
				memcpy(&iface->eps[iface->eps_num].desc, buffer + offset, sizeof(iface->eps[iface->eps_num].desc));
				iface->eps_num++;
			}
		}
		offset += desc_length;
	}
	return true;
}

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 >= USB_MAX_FDS)
		return NULL;
	if (!parse_usb_descriptor(dev, dev_len, &usb_devices[i].index))
		return NULL;
	__atomic_store_n(&usb_devices[i].fd, fd, __ATOMIC_RELEASE);
	return &usb_devices[i].index;
}

struct vusb_connect_string_descriptor {
	uint32_t len;
	char* str;
} __attribute__((packed));

struct vusb_connect_descriptors {
	uint32_t qual_len;
	char* qual;
	uint32_t bos_len;
	char* bos;
	uint32_t strs_len;
	struct vusb_connect_string_descriptor strs[0];
} __attribute__((packed));

static const char default_string[] = {
    8, USB_DT_STRING,
    's', 0, 'y', 0, 'z', 0
};

static const char default_lang_id[] = {
    4, USB_DT_STRING,
    0x09, 0x04
};

static bool lookup_connect_response_in(int fd, const struct vusb_connect_descriptors* descs,
				       const struct usb_ctrlrequest* ctrl,
				       struct usb_qualifier_descriptor* qual,
				       char** response_data, uint32_t* response_length)
{
	struct usb_device_index* index = lookup_usb_index(fd);
	uint8_t str_idx;
	if (!index)
		return false;
	switch (ctrl->bRequestType & USB_TYPE_MASK) {
	case USB_TYPE_STANDARD:
		switch (ctrl->bRequest) {
		case USB_REQ_GET_DESCRIPTOR:
			switch (ctrl->wValue >> 8) {
			case USB_DT_DEVICE:
				*response_data = (char*)index->dev;
				*response_length = sizeof(*index->dev);
				return true;
			case USB_DT_CONFIG:
				*response_data = (char*)index->config;
				*response_length = index->config_length;
				return true;
			case USB_DT_STRING:
				str_idx = (uint8_t)ctrl->wValue;
				if (descs && str_idx < descs->strs_len) {
					*response_data = descs->strs[str_idx].str;
					*response_length = descs->strs[str_idx].len;
					return true;
				}
				if (str_idx == 0) {
					*response_data = (char*)&default_lang_id[0];
					*response_length = default_lang_id[0];
					return true;
				}
				*response_data = (char*)&default_string[0];
				*response_length = default_string[0];
				return true;
			case USB_DT_BOS:
				*response_data = descs->bos;
				*response_length = descs->bos_len;
				return true;
			case USB_DT_DEVICE_QUALIFIER:
				if (!descs->qual) {
					qual->bLength = sizeof(*qual);
					qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
					qual->bcdUSB = index->dev->bcdUSB;
					qual->bDeviceClass = index->dev->bDeviceClass;
					qual->bDeviceSubClass = index->dev->bDeviceSubClass;
					qual->bDeviceProtocol = index->dev->bDeviceProtocol;
					qual->bMaxPacketSize0 = index->dev->bMaxPacketSize0;
					qual->bNumConfigurations = index->dev->bNumConfigurations;
					qual->bRESERVED = 0;
					*response_data = (char*)qual;
					*response_length = sizeof(*qual);
					return true;
				}
				*response_data = descs->qual;
				*response_length = descs->qual_len;
				return true;
			default:
				break;
			}
			break;
		default:
			break;
		}
		break;
	default:
		break;
	}
	return false;
}

typedef bool (*lookup_connect_out_response_t)(int fd, const struct vusb_connect_descriptors* descs,
					      const struct usb_ctrlrequest* ctrl, bool* done);

static bool lookup_connect_response_out_generic(int fd, const struct vusb_connect_descriptors* descs,
						const struct usb_ctrlrequest* ctrl, bool* done)
{
	switch (ctrl->bRequestType & USB_TYPE_MASK) {
	case USB_TYPE_STANDARD:
		switch (ctrl->bRequest) {
		case USB_REQ_SET_CONFIGURATION:
			*done = true;
			return true;
		default:
			break;
		}
		break;
	}
	return false;
}

struct vusb_descriptor {
	uint8_t req_type;
	uint8_t desc_type;
	uint32_t len;
	char data[0];
} __attribute__((packed));

struct vusb_descriptors {
	uint32_t len;
	struct vusb_descriptor* generic;
	struct vusb_descriptor* descs[0];
} __attribute__((packed));

struct vusb_response {
	uint8_t type;
	uint8_t req;
	uint32_t len;
	char data[0];
} __attribute__((packed));

struct vusb_responses {
	uint32_t len;
	struct vusb_response* generic;
	struct vusb_response* resps[0];
} __attribute__((packed));

static bool lookup_control_response(const struct vusb_descriptors* descs, const struct vusb_responses* resps,
				    struct usb_ctrlrequest* ctrl, char** response_data, uint32_t* response_length)
{
	int descs_num = 0;
	int resps_num = 0;
	if (descs)
		descs_num = (descs->len - offsetof(struct vusb_descriptors, descs)) / sizeof(descs->descs[0]);
	if (resps)
		resps_num = (resps->len - offsetof(struct vusb_responses, resps)) / sizeof(resps->resps[0]);
	uint8_t req = ctrl->bRequest;
	uint8_t req_type = ctrl->bRequestType & USB_TYPE_MASK;
	uint8_t desc_type = ctrl->wValue >> 8;
	if (req == USB_REQ_GET_DESCRIPTOR) {
		int i;
		for (i = 0; i < descs_num; i++) {
			struct vusb_descriptor* desc = descs->descs[i];
			if (!desc)
				continue;
			if (desc->req_type == req_type && desc->desc_type == desc_type) {
				*response_length = desc->len;
				if (*response_length != 0)
					*response_data = &desc->data[0];
				else
					*response_data = NULL;
				return true;
			}
		}
		if (descs && descs->generic) {
			*response_data = &descs->generic->data[0];
			*response_length = descs->generic->len;
			return true;
		}
	} else {
		int i;
		for (i = 0; i < resps_num; i++) {
			struct vusb_response* resp = resps->resps[i];
			if (!resp)
				continue;
			if (resp->type == req_type && resp->req == req) {
				*response_length = resp->len;
				if (*response_length != 0)
					*response_data = &resp->data[0];
				else
					*response_data = NULL;
				return true;
			}
		}
		if (resps && resps->generic) {
			*response_data = &resps->generic->data[0];
			*response_length = resps->generic->len;
			return true;
		}
	}
	return false;
}

#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_EPS_NUM_MAX 30
#define USB_RAW_EP_NAME_MAX 16
#define USB_RAW_EP_ADDR_ANY 0xff

struct usb_raw_ep_caps {
	__u32 type_control : 1;
	__u32 type_iso : 1;
	__u32 type_bulk : 1;
	__u32 type_int : 1;
	__u32 dir_in : 1;
	__u32 dir_out : 1;
};

struct usb_raw_ep_limits {
	__u16 maxpacket_limit;
	__u16 max_streams;
	__u32 reserved;
};

struct usb_raw_ep_info {
	__u8 name[USB_RAW_EP_NAME_MAX];
	__u32 addr;
	struct usb_raw_ep_caps caps;
	struct usb_raw_ep_limits limits;
};

struct usb_raw_eps_info {
	struct usb_raw_ep_info eps[USB_RAW_EPS_NUM_MAX];
};

#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)
#define USB_RAW_IOCTL_EPS_INFO _IOR('U', 11, struct usb_raw_eps_info)
#define USB_RAW_IOCTL_EP0_STALL _IO('U', 12)
#define USB_RAW_IOCTL_EP_SET_HALT _IOW('U', 13, __u32)
#define USB_RAW_IOCTL_EP_CLEAR_HALT _IOW('U', 14, __u32)
#define USB_RAW_IOCTL_EP_SET_WEDGE _IOW('U', 15, __u32)

static int usb_raw_open()
{
	return open("/dev/raw-gadget", O_RDWR);
}

static int usb_raw_init(int fd, uint32_t 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_configure(int fd)
{
	return ioctl(fd, USB_RAW_IOCTL_CONFIGURE, 0);
}

static int usb_raw_vbus_draw(int fd, uint32_t power)
{
	return ioctl(fd, USB_RAW_IOCTL_VBUS_DRAW, power);
}

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);
}

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_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_ep0_stall(int fd)
{
	return ioctl(fd, USB_RAW_IOCTL_EP0_STALL, 0);
}

static int lookup_interface(int fd, uint8_t bInterfaceNumber, uint8_t bAlternateSetting)
{
	struct usb_device_index* index = lookup_usb_index(fd);
	if (!index)
		return -1;
	for (int i = 0; i < index->ifaces_num; i++) {
		if (index->ifaces[i].bInterfaceNumber == bInterfaceNumber &&
		    index->ifaces[i].bAlternateSetting == bAlternateSetting)
			return i;
	}
	return -1;
}

#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];
};

static void set_interface(int fd, int n)
{
	struct usb_device_index* index = lookup_usb_index(fd);
	if (!index)
		return;
	if (index->iface_cur >= 0 && index->iface_cur < index->ifaces_num) {
		for (int ep = 0; ep < index->ifaces[index->iface_cur].eps_num; ep++) {
			int rv = usb_raw_ep_disable(fd, index->ifaces[index->iface_cur].eps[ep].handle);
			if (rv < 0) {
			} else {
			}
		}
	}
	if (n >= 0 && n < index->ifaces_num) {
		for (int ep = 0; ep < index->ifaces[n].eps_num; ep++) {
			int rv = usb_raw_ep_enable(fd, &index->ifaces[n].eps[ep].desc);
			if (rv < 0) {
			} else {
				index->ifaces[n].eps[ep].handle = 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) {
		return rv;
	}
	rv = usb_raw_configure(fd);
	if (rv < 0) {
		return rv;
	}
	set_interface(fd, 0);
	return 0;
}

static volatile long syz_usb_connect_impl(uint64_t speed, uint64_t dev_len, const char* dev,
					  const struct vusb_connect_descriptors* descs,
					  lookup_connect_out_response_t lookup_connect_response_out)
{
	if (!dev) {
		return -1;
	}
	int fd = usb_raw_open();
	if (fd < 0) {
		return fd;
	}
	if (fd >= MAX_FDS) {
		close(fd);
		return -1;
	}
	struct usb_device_index* index = add_usb_index(fd, dev, dev_len);
	if (!index) {
		return -1;
	}
	char device[32];
	sprintf(&device[0], "dummy_udc.%llu", procid);
	int rv = usb_raw_init(fd, speed, "dummy_udc", &device[0]);
	if (rv < 0) {
		return rv;
	}
	rv = usb_raw_run(fd);
	if (rv < 0) {
		return rv;
	}
	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) {
			return rv;
		}
		if (event.inner.type != USB_RAW_EVENT_CONTROL)
			continue;
		char* response_data = NULL;
		uint32_t response_length = 0;
		struct usb_qualifier_descriptor qual;
		if (event.ctrl.bRequestType & USB_DIR_IN) {
			if (!lookup_connect_response_in(fd, descs, &event.ctrl, &qual, &response_data, &response_length)) {
				usb_raw_ep0_stall(fd);
				continue;
			}
		} else {
			if (!lookup_connect_response_out(fd, descs, &event.ctrl, &done)) {
				usb_raw_ep0_stall(fd);
				continue;
			}
			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) {
				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) {
			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);
		}
		if (rv < 0) {
			return rv;
		}
	}
	sleep_ms(200);
	return fd;
}

static volatile long syz_usb_connect(volatile long a0, volatile long a1, volatile long a2, volatile long a3)
{
	uint64_t speed = a0;
	uint64_t 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);
}

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) {
		return rv;
	}
	if (event.inner.type != USB_RAW_EVENT_CONTROL) {
		return -1;
	}
	char* response_data = NULL;
	uint32_t response_length = 0;
	if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) {
		if (!lookup_control_response(descs, resps, &event.ctrl, &response_data, &response_length)) {
			usb_raw_ep0_stall(fd);
			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;
			int iface_index = lookup_interface(fd, iface_num, alt_set);
			if (iface_index < 0) {
			} else {
				set_interface(fd, iface_index);
			}
		}
		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) {
		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) {
		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);
	}
	if (rv < 0) {
		return rv;
	}
	sleep_ms(200);
	return 0;
}

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
		syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
				intptr_t res = 0;
memcpy((void*)0x20000040, "\x12\x01\x00\x00\x6f\xf9\x46\x10\xb4\x07\x0a\x01\x02\x01\x00\x00\x00\x01\x09\x02\x24\x00\x01\x00\x00\x00\x01\x09\x04\xc0\x00\x02\xa6\xdb\x5d\x00\x09\x05\x09\x1e\x00\x00\x00\x00\x00\x09\x05\x8f\x02\x38\xea\x72\xb9\x58\x10\xc9\x67\x92\xa9\xf2\xb6\xce\x7a\xe8\x29\x42\xc1\xea\x33\xc5\xd6\xe1\xfc\xe2\xbe\x25\x87\xb9\x5a\xd0\x14\xd6\xe9\x1f\x33\x12\x98\xf4\x82\x23\x08\x1b\xff\xe7\x21\x16\x72\xd9\xe3\x95\x5c\xd2\x3b\xfb\x1d\xb8\x81\xa7\x64\x2a\xdc\xfa\xa2\xf6\xe8\xcb\x5a\x1c\xbb\x82\x5a\xa1\xcd\x52\xd1\x79\xe3\xa3\x07\xee\x86\xab\x79\x38\x18\x6f\x8e\x83\x98\x07", 140);
	res = -1;
res = syz_usb_connect(/*speed=*/0, /*dev_len=*/0x1cf, /*dev=*/0x20000040, /*conn_descs=*/0);
	if (res != -1)
		r[0] = res;
*(uint32_t*)0x20000240 = 0x2c;
*(uint64_t*)0x20000244 = 0;
*(uint64_t*)0x2000024c = 0;
*(uint64_t*)0x20000254 = 0;
*(uint64_t*)0x2000025c = 0x200001c0;
*(uint8_t*)0x200001c0 = 0x20;
*(uint8_t*)0x200001c1 = 0x29;
*(uint32_t*)0x200001c2 = 0xf;
*(uint8_t*)0x200001c6 = 0xf;
*(uint8_t*)0x200001c7 = 0x29;
*(uint8_t*)0x200001c8 = 3;
*(uint16_t*)0x200001c9 = 0x10;
*(uint8_t*)0x200001cb = 6;
*(uint8_t*)0x200001cc = 0xab;
memcpy((void*)0x200001cd, "\xc6\x7b\x0a\x5d", 4);
memcpy((void*)0x200001d1, "\x96\x24\x22\x38", 4);
*(uint64_t*)0x20000264 = 0;
*(uint32_t*)0x200006c0 = 0x84;
*(uint64_t*)0x200006c4 = 0x20000280;
*(uint8_t*)0x20000280 = 0;
*(uint8_t*)0x20000281 = 8;
*(uint32_t*)0x20000282 = 0x50;
memcpy((void*)0x20000286, "\x36\x27\xfb\xe8\x3b\xd7\x3e\xed\x75\x33\xa9\x6e\x06\xff\x4a\x59\x5e\x69\x91\x55\x3d\xc9\x2a\xd9\x5f\x3a\x7c\x8a\x2d\x96\xd3\x16\x2d\xc7\x3f\x78\xed\xce\x48\xb5\x21\x1b\xf5\x4d\xf6\x05\xa7\x47\x88\x01\x32\x47\x4f\x4f\x9b\x5b\x55\x18\xc1\x6f\xa0\x87\x16\xf4\xb0\x60\x95\x50\x89\x10\xc0\x3b\x62\x99\xb5\x6d\x93\xba\x16\xd2", 80);
*(uint64_t*)0x200006cc = 0;
*(uint64_t*)0x200006d4 = 0x20000340;
*(uint8_t*)0x20000340 = 0;
*(uint8_t*)0x20000341 = 8;
*(uint32_t*)0x20000342 = 1;
*(uint8_t*)0x20000346 = 0x5f;
*(uint64_t*)0x200006dc = 0;
*(uint64_t*)0x200006e4 = 0;
*(uint64_t*)0x200006ec = 0;
*(uint64_t*)0x200006f4 = 0;
*(uint64_t*)0x200006fc = 0;
*(uint64_t*)0x20000704 = 0;
*(uint64_t*)0x2000070c = 0;
*(uint64_t*)0x20000714 = 0;
*(uint64_t*)0x2000071c = 0x20000580;
*(uint8_t*)0x20000580 = 0x40;
*(uint8_t*)0x20000581 = 0x19;
*(uint32_t*)0x20000582 = 2;
memcpy((void*)0x20000586, "J&", 2);
*(uint64_t*)0x20000724 = 0;
*(uint64_t*)0x2000072c = 0;
*(uint64_t*)0x20000734 = 0;
*(uint64_t*)0x2000073c = 0;
syz_usb_control_io(/*fd=*/r[0], /*descs=*/0x20000240, /*resps=*/0x200006c0);
	{
	int i;
	for(i = 0; i < 64; i++) {
syz_usb_control_io(/*fd=*/r[0], /*descs=*/0x20000240, /*resps=*/0x200006c0);
		}
	}
	return 0;
}

Attachment: .config
Description: Binary data