report

TITLE: divide error in alauda_transport
divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 2 PID: 8229 Comm: usb-storage Not tainted 6.8.0-05202-g9187210eee7d #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014
RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline]
RIP: 0010:alauda_transport+0xcaf/0x3830 drivers/usb/storage/alauda.c:1184
Code: 24 18 01 00 00 00 00 00 00 48 c1 e8 03 85 f6 48 89 44 24 30 0f 84 af 01 00 00 4c 89 54 24 70 4d 89 dc 31 d2 44 89 f0 4c 89 e7 <f7> 74 24 48 89 c5 41 89 d5 89 ee e8 e1 c1 ff ff 66 44 30
RSP: 0018:ffffc90010ccfa60 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888024f12cb8
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10049e25ad
R10: ffff888024f13088 R11: ffff888024f12cb8 R12: ffff888024f12cb8
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055679a87dd88 CR3: 000000000c774000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
 <TASK>
 usb_stor_invoke_transport+0xea/0x13d0 drivers/usb/storage/transport.c:611
 usb_stor_control_thread+0x5d6/0x980 drivers/usb/storage/usb.c:368
 kthread+0x2eb/0x3d0 kernel/kthread.c:388
 ret_from_fork+0x2f/0x70 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline]
RIP: 0010:alauda_transport+0xcaf/0x3830 drivers/usb/storage/alauda.c:1184
Code: 24 18 01 00 00 00 00 00 00 48 c1 e8 03 85 f6 48 89 44 24 30 0f 84 af 01 00 00 4c 89 54 24 70 4d 89 dc 31 d2 44 89 f0 4c 89 e7 <f7> 74 24 48 89 c5 41 89 d5 89 ee e8 e1 c1 ff ff 66 44 30
RSP: 0018:ffffc90010ccfa60 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888024f12cb8
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10049e25ad
R10: ffff888024f13088 R11: ffff888024f12cb8 R12: ffff888024f12cb8
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055679a875010 CR3: 0000000023588000 CR4: 0000000000750ef0
PKRU: 55555554
----------------
Code disassembly (best guess):
   0:	24 18                	and    $0x18,%al
   2:	01 00                	add    %eax,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	00 00                	add    %al,(%rax)
   8:	00 48 c1             	add    %cl,-0x3f(%rax)
   b:	e8 03 85 f6 48       	call   0x48f68513
  10:	89 44 24 30          	mov    %eax,0x30(%rsp)
  14:	0f 84 af 01 00 00    	je     0x1c9
  1a:	4c 89 54 24 70       	mov    %r10,0x70(%rsp)
  1f:	4d 89 dc             	mov    %r11,%r12
  22:	31 d2                	xor    %edx,%edx
  24:	44 89 f0             	mov    %r14d,%eax
  27:	4c 89 e7             	mov    %r12,%rdi
* 2a:	f7 74 24 48          	divl   0x48(%rsp) <-- trapping instruction
  2e:	89 c5                	mov    %eax,%ebp
  30:	41 89 d5             	mov    %edx,%r13d
  33:	89 ee                	mov    %ebp,%esi
  35:	e8 e1 c1 ff ff       	call   0xffffc21b
  3a:	66                   	data16
  3b:	44                   	rex.R
  3c:	30                   	.byte 0x30


TITLE: kernel panic: Fatal exception
CORRUPTED: true (report format is marked as corrupted)
MAINTAINERS (TO): []
MAINTAINERS (CC): []

CPU: 2 PID: 8229 Comm: usb-storage Not tainted 6.8.0-05202-g9187210eee7d #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014
RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline]
RIP: 0010:alauda_transport+0xcaf/0x3830 drivers/usb/storage/alauda.c:1184
Code: 24 18 01 00 00 00 00 00 00 48 c1 e8 03 85 f6 48 89 44 24 30 0f 84 af 01 00 00 4c 89 54 24 70 4d 89 dc 31 d2 44 89 f0 4c 89 e7 <f7> 74 24 48 89 c5 41 89 d5 89 ee e8 e1 c1 ff ff 66 44 30
RSP: 0018:ffffc90010ccfa60 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888024f12cb8
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10049e25ad
R10: ffff888024f13088 R11: ffff888024f12cb8 R12: ffff888024f12cb8
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055679a87dd88 CR3: 000000000c774000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
 <TASK>
 usb_stor_invoke_transport+0xea/0x13d0 drivers/usb/storage/transport.c:611
 usb_stor_control_thread+0x5d6/0x980 drivers/usb/storage/usb.c:368
 kthread+0x2eb/0x3d0 kernel/kthread.c:388
 ret_from_fork+0x2f/0x70 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline]
RIP: 0010:alauda_transport+0xcaf/0x3830 drivers/usb/storage/alauda.c:1184
Code: 24 18 01 00 00 00 00 00 00 48 c1 e8 03 85 f6 48 89 44 24 30 0f 84 af 01 00 00 4c 89 54 24 70 4d 89 dc 31 d2 44 89 f0 4c 89 e7 <f7> 74 24 48 89 c5 41 89 d5 89 ee e8 e1 c1 ff ff 66 44 30
RSP: 0018:ffffc90010ccfa60 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888024f12cb8
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10049e25ad
R10: ffff888024f13088 R11: ffff888024f12cb8 R12: ffff888024f12cb8
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055679a875010 CR3: 0000000023588000 CR4: 0000000000750ef0
PKRU: 55555554
Kernel panic - not syncing: Fatal exception
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess):
   0:	24 18                	and    $0x18,%al
   2:	01 00                	add    %eax,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	00 00                	add    %al,(%rax)
   8:	00 48 c1             	add    %cl,-0x3f(%rax)
   b:	e8 03 85 f6 48       	call   0x48f68513
  10:	89 44 24 30          	mov    %eax,0x30(%rsp)
  14:	0f 84 af 01 00 00    	je     0x1c9
  1a:	4c 89 54 24 70       	mov    %r10,0x70(%rsp)
  1f:	4d 89 dc             	mov    %r11,%r12
  22:	31 d2                	xor    %edx,%edx
  24:	44 89 f0             	mov    %r14d,%eax
  27:	4c 89 e7             	mov    %r12,%rdi
* 2a:	f7 74 24 48          	divl   0x48(%rsp) <-- trapping instruction
  2e:	89 c5                	mov    %eax,%ebp
  30:	41 89 d5             	mov    %edx,%r13d
  33:	89 ee                	mov    %ebp,%esi
  35:	e8 e1 c1 ff ff       	call   0xffffc21b
  3a:	66                   	data16
  3b:	44                   	rex.R
  3c:	30                   	.byte 0x30

repro.c

#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*)0x20000000,
         "\x12\x01\x00\x00\xbc\x61\xb4\x08\xb4\x07\x0a\x01\x02\x01\x00\x00\x00"
         "\x01\x09\x02\x24\x00\x01\x00\x00\x00\x5b\x09\x04\x00\x00\x02\x19\xa4"
         "\xb4\x00\x09\x05\x0e\x02\x00\x1b\xc4\x00\x00\x09\x05\x82\x02",
         49);
  res = -1;
  res = syz_usb_connect(/*speed=*/0, /*dev_len=*/0x36, /*dev=*/0x20000000,
                        /*conn_descs=*/0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x20000840 = 0x84;
  *(uint64_t*)0x20000844 = 0x20000440;
  *(uint8_t*)0x20000440 = 0x20;
  *(uint8_t*)0x20000441 = 7;
  *(uint32_t*)0x20000442 = 0xba;
  memcpy((void*)0x20000446,
         "\x26\x15\x91\x55\x33\xe9\x67\xd6\x3c\x01\xba\x52\xb0\x88\xd8\x2d\x33"
         "\x31\x9a\x3e\xe5\x79\x49\x03\xde\xd3\xff\x0b\xae\xa8\xb5\xdc\x7b\xbf"
         "\x28\x50\x84\x2d\x6c\xcd\xcd\x31\xf7\xfb\xbd\x78\xf4\xac\x80\x16\xc7"
         "\xfc\xb6\xb4\xca\x77\x5e\x60\x83\xd1\x1b\x74\x14\x44\x19\xdd\x07\xf6"
         "\x9a\x2e\x65\xa5\x57\x1a\xd0\x33\x15\x63\x7a\x0a\x29\x31\x75\x3c\x25"
         "\x7f\x8c\x22\x0f\xdb\x24\xdd\x1c\xb8\x66\xaa\xfc\xac\x61\xe7\x84\x10"
         "\x33\x27\x12\xaa\x5c\x6a\x21\xbe\xdd\x0b\x2f\x06\x29\xdc\x6c\xe2\x8c"
         "\x9a\x1b\xfd\xdf\x71\x15\x31\x5d\x4c\x5a\x1c\x29\x73\x01\x69\x9e\x67"
         "\xc3\x27\xa7\x55\xd5\x4a\xe7\xdd\x85\xcc\x1b\xfb\xdf\xba\xa7\x1f\xad"
         "\x59\xdb\xde\x04\xc2\xe6\x6a\x52\x9b\x9b\x2d\x47\x59\xf8\x44\xd5\xdd"
         "\x37\x52\x31\x4f\x35\xe2\x65\x5b\x78\x6a\x1d\xcd\x9c\xa0\x38\xe8",
         186);
  *(uint64_t*)0x2000084c = 0;
  *(uint64_t*)0x20000854 = 0;
  *(uint64_t*)0x2000085c = 0;
  *(uint64_t*)0x20000864 = 0;
  *(uint64_t*)0x2000086c = 0;
  *(uint64_t*)0x20000874 = 0;
  *(uint64_t*)0x2000087c = 0;
  *(uint64_t*)0x20000884 = 0;
  *(uint64_t*)0x2000088c = 0;
  *(uint64_t*)0x20000894 = 0;
  *(uint64_t*)0x2000089c = 0;
  *(uint64_t*)0x200008a4 = 0;
  *(uint64_t*)0x200008ac = 0;
  *(uint64_t*)0x200008b4 = 0;
  *(uint64_t*)0x200008bc = 0;
  syz_usb_control_io(/*fd=*/r[0], /*descs=*/0, /*resps=*/0x20000840);
  {
    int i;
    for (i = 0; i < 64; i++) {
      syz_usb_control_io(/*fd=*/r[0], /*descs=*/0, /*resps=*/0x20000840);
    }
  }
  return 0;
}

repro.txt

r0 = syz_usb_connect(0x0, 0x36, &(0x7f0000000000)=ANY=[@ANYBLOB="12010000bc61b408b4070a0102010000000109022400010000005b090400000219a4b40009050e02001bc4000009058202"], 0x0)
syz_usb_control_io(r0, 0x0, &(0x7f0000000840)={0x84, &(0x7f0000000440)={0x20, 0x7, 0xba, "2615915533e967d63c01ba52b088d82d33319a3ee5794903ded3ff0baea8b5dc7bbf2850842d6ccdcd31f7fbbd78f4ac8016c7fcb6b4ca775e6083d11b74144419dd07f69a2e65a5571ad03315637a0a2931753c257f8c220fdb24dd1cb866aafcac61e78410332712aa5c6a21bedd0b2f0629dc6ce28c9a1bfddf7115315d4c5a1c297301699e67c327a755d54ae7dd85cc1bfbdfbaa71fad59dbde04c2e66a529b9b2d4759f844d5dd3752314f35e2655b786a1dcd9ca038e8"}, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}) (rerun: 64)