| // KASAN: use-after-free Read in ds_probe |
| // https://syzkaller.appspot.com/bug?id=2d87f9f3ffe216db0978f948f4d6f92c8cd87d31 |
| // status:dup |
| // 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> |
| |
| unsigned long long procid; |
| |
| static void sleep_ms(uint64_t ms) |
| { |
| usleep(ms * 1000); |
| } |
| |
| #define USB_MAX_EP_NUM 32 |
| |
| struct usb_device_index { |
| struct usb_device_descriptor* dev; |
| struct usb_config_descriptor* config; |
| unsigned config_length; |
| struct usb_interface_descriptor* iface; |
| struct usb_endpoint_descriptor* eps[USB_MAX_EP_NUM]; |
| unsigned eps_num; |
| }; |
| |
| static bool parse_usb_descriptor(char* buffer, size_t length, |
| struct usb_device_index* index) |
| { |
| if (length < |
| sizeof(*index->dev) + sizeof(*index->config) + sizeof(*index->iface)) |
| return false; |
| index->dev = (struct usb_device_descriptor*)buffer; |
| index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev)); |
| index->config_length = length - sizeof(*index->dev); |
| index->iface = |
| (struct usb_interface_descriptor*)(buffer + sizeof(*index->dev) + |
| sizeof(*index->config)); |
| index->eps_num = 0; |
| size_t offset = 0; |
| while (true) { |
| if (offset == length) |
| break; |
| if (offset + 1 < length) |
| break; |
| uint8_t length = buffer[offset]; |
| uint8_t type = buffer[offset + 1]; |
| if (type == USB_DT_ENDPOINT) { |
| index->eps[index->eps_num] = |
| (struct usb_endpoint_descriptor*)(buffer + offset); |
| index->eps_num++; |
| } |
| if (index->eps_num == USB_MAX_EP_NUM) |
| break; |
| offset += length; |
| } |
| return true; |
| } |
| |
| enum usb_fuzzer_event_type { |
| USB_FUZZER_EVENT_INVALID, |
| USB_FUZZER_EVENT_CONNECT, |
| USB_FUZZER_EVENT_DISCONNECT, |
| USB_FUZZER_EVENT_SUSPEND, |
| USB_FUZZER_EVENT_RESUME, |
| USB_FUZZER_EVENT_CONTROL, |
| }; |
| |
| struct usb_fuzzer_event { |
| uint32_t type; |
| uint32_t length; |
| char data[0]; |
| }; |
| |
| struct usb_fuzzer_init { |
| uint64_t speed; |
| const char* driver_name; |
| const char* device_name; |
| }; |
| |
| struct usb_fuzzer_ep_io { |
| uint16_t ep; |
| uint16_t flags; |
| uint32_t length; |
| char data[0]; |
| }; |
| |
| #define USB_FUZZER_IOCTL_INIT _IOW('U', 0, struct usb_fuzzer_init) |
| #define USB_FUZZER_IOCTL_RUN _IO('U', 1) |
| #define USB_FUZZER_IOCTL_EP0_READ _IOWR('U', 2, struct usb_fuzzer_event) |
| #define USB_FUZZER_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_fuzzer_ep_io) |
| #define USB_FUZZER_IOCTL_EP_ENABLE _IOW('U', 4, struct usb_endpoint_descriptor) |
| #define USB_FUZZER_IOCTL_EP_WRITE _IOW('U', 6, struct usb_fuzzer_ep_io) |
| #define USB_FUZZER_IOCTL_CONFIGURE _IO('U', 8) |
| #define USB_FUZZER_IOCTL_VBUS_DRAW _IOW('U', 9, uint32_t) |
| |
| int usb_fuzzer_open() |
| { |
| return open("/sys/kernel/debug/usb-fuzzer", O_RDWR); |
| } |
| |
| int usb_fuzzer_init(int fd, uint32_t speed, const char* driver, |
| const char* device) |
| { |
| struct usb_fuzzer_init arg; |
| arg.speed = speed; |
| arg.driver_name = driver; |
| arg.device_name = device; |
| return ioctl(fd, USB_FUZZER_IOCTL_INIT, &arg); |
| } |
| |
| int usb_fuzzer_run(int fd) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_RUN, 0); |
| } |
| |
| int usb_fuzzer_ep0_read(int fd, struct usb_fuzzer_event* event) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_EP0_READ, event); |
| } |
| |
| int usb_fuzzer_ep0_write(int fd, struct usb_fuzzer_ep_io* io) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_EP0_WRITE, io); |
| } |
| |
| int usb_fuzzer_ep_write(int fd, struct usb_fuzzer_ep_io* io) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_EP_WRITE, io); |
| } |
| |
| int usb_fuzzer_ep_enable(int fd, struct usb_endpoint_descriptor* desc) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_EP_ENABLE, desc); |
| } |
| |
| int usb_fuzzer_configure(int fd) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_CONFIGURE, 0); |
| } |
| |
| int usb_fuzzer_vbus_draw(int fd, uint32_t power) |
| { |
| return ioctl(fd, USB_FUZZER_IOCTL_VBUS_DRAW, power); |
| } |
| |
| #define USB_MAX_PACKET_SIZE 1024 |
| |
| struct usb_fuzzer_control_event { |
| struct usb_fuzzer_event inner; |
| struct usb_ctrlrequest ctrl; |
| }; |
| |
| struct usb_fuzzer_ep_io_data { |
| struct usb_fuzzer_ep_io inner; |
| char data[USB_MAX_PACKET_SIZE]; |
| }; |
| |
| 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 volatile long syz_usb_connect(volatile long a0, volatile long a1, |
| volatile long a2, volatile long a3) |
| { |
| int64_t speed = a0; |
| int64_t dev_len = a1; |
| char* dev = (char*)a2; |
| struct vusb_connect_descriptors* conn_descs = |
| (struct vusb_connect_descriptors*)a3; |
| if (!dev) |
| return -1; |
| struct usb_device_index index; |
| memset(&index, 0, sizeof(index)); |
| int rv = parse_usb_descriptor(dev, dev_len, &index); |
| if (!rv) |
| return -1; |
| int fd = usb_fuzzer_open(); |
| if (fd < 0) |
| return -1; |
| char device[32]; |
| sprintf(&device[0], "dummy_udc.%llu", procid); |
| rv = usb_fuzzer_init(fd, speed, "dummy_udc", &device[0]); |
| if (rv < 0) |
| return -1; |
| rv = usb_fuzzer_run(fd); |
| if (rv < 0) |
| return -1; |
| bool done = false; |
| while (!done) { |
| char* response_data = NULL; |
| uint32_t response_length = 0; |
| unsigned ep; |
| uint8_t str_idx; |
| struct usb_fuzzer_control_event event; |
| event.inner.type = 0; |
| event.inner.length = sizeof(event.ctrl); |
| rv = usb_fuzzer_ep0_read(fd, (struct usb_fuzzer_event*)&event); |
| if (rv < 0) |
| return -1; |
| if (event.inner.type != USB_FUZZER_EVENT_CONTROL) |
| continue; |
| switch (event.ctrl.bRequestType & USB_TYPE_MASK) { |
| case USB_TYPE_STANDARD: |
| switch (event.ctrl.bRequest) { |
| case USB_REQ_GET_DESCRIPTOR: |
| switch (event.ctrl.wValue >> 8) { |
| case USB_DT_DEVICE: |
| response_data = (char*)index.dev; |
| response_length = sizeof(*index.dev); |
| goto reply; |
| case USB_DT_CONFIG: |
| response_data = (char*)index.config; |
| response_length = index.config_length; |
| goto reply; |
| case USB_DT_STRING: |
| str_idx = (uint8_t)event.ctrl.wValue; |
| if (str_idx >= conn_descs->strs_len) |
| goto reply; |
| response_data = conn_descs->strs[str_idx].str; |
| response_length = conn_descs->strs[str_idx].len; |
| goto reply; |
| case USB_DT_BOS: |
| response_data = conn_descs->bos; |
| response_length = conn_descs->bos_len; |
| goto reply; |
| case USB_DT_DEVICE_QUALIFIER: |
| response_data = conn_descs->qual; |
| response_length = conn_descs->qual_len; |
| goto reply; |
| default: |
| exit(1); |
| continue; |
| } |
| break; |
| case USB_REQ_SET_CONFIGURATION: |
| rv = usb_fuzzer_vbus_draw(fd, index.config->bMaxPower); |
| if (rv < 0) |
| return -1; |
| rv = usb_fuzzer_configure(fd); |
| if (rv < 0) |
| return -1; |
| for (ep = 0; ep < index.eps_num; ep++) { |
| rv = usb_fuzzer_ep_enable(fd, index.eps[ep]); |
| if (rv < 0) |
| exit(1); |
| } |
| done = true; |
| goto reply; |
| default: |
| exit(1); |
| continue; |
| } |
| break; |
| default: |
| exit(1); |
| continue; |
| } |
| struct usb_fuzzer_ep_io_data response; |
| reply: |
| response.inner.ep = 0; |
| response.inner.flags = 0; |
| if (response_length > sizeof(response.data)) |
| response_length = 0; |
| response.inner.length = response_length; |
| if (response_data) |
| memcpy(&response.data[0], response_data, response_length); |
| if (event.ctrl.wLength < response.inner.length) |
| response.inner.length = event.ctrl.wLength; |
| usb_fuzzer_ep0_write(fd, (struct usb_fuzzer_ep_io*)&response); |
| } |
| sleep_ms(200); |
| return fd; |
| } |
| |
| 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 volatile long syz_usb_control_io(volatile long a0, volatile long a1, |
| volatile long a2) |
| { |
| int fd = a0; |
| struct vusb_descriptors* descs = (struct vusb_descriptors*)a1; |
| struct vusb_responses* resps = (struct vusb_responses*)a2; |
| struct usb_fuzzer_control_event event; |
| event.inner.type = 0; |
| event.inner.length = sizeof(event.ctrl); |
| int rv = usb_fuzzer_ep0_read(fd, (struct usb_fuzzer_event*)&event); |
| if (rv < 0) |
| return -1; |
| if (event.inner.type != USB_FUZZER_EVENT_CONTROL) |
| return -1; |
| uint8_t req = event.ctrl.bRequest; |
| uint8_t req_type = event.ctrl.bRequestType & USB_TYPE_MASK; |
| uint8_t desc_type = event.ctrl.wValue >> 8; |
| char* response_data = NULL; |
| uint32_t response_length = 0; |
| if (req == USB_REQ_GET_DESCRIPTOR) { |
| int i; |
| int descs_num = (descs->len - offsetof(struct vusb_descriptors, descs)) / |
| sizeof(descs->descs[0]); |
| 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]; |
| goto reply; |
| } |
| } |
| if (descs->generic) { |
| response_data = &descs->generic->data[0]; |
| response_length = descs->generic->len; |
| goto reply; |
| } |
| } else { |
| int i; |
| int resps_num = (resps->len - offsetof(struct vusb_responses, resps)) / |
| sizeof(resps->resps[0]); |
| 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]; |
| goto reply; |
| } |
| } |
| if (resps->generic) { |
| response_data = &resps->generic->data[0]; |
| response_length = resps->generic->len; |
| goto reply; |
| } |
| } |
| return -1; |
| struct usb_fuzzer_ep_io_data response; |
| |
| reply: |
| response.inner.ep = 0; |
| response.inner.flags = 0; |
| if (response_length > sizeof(response.data)) |
| response_length = 0; |
| response.inner.length = response_length; |
| if (response_data) |
| memcpy(&response.data[0], response_data, response_length); |
| if (event.ctrl.wLength < response.inner.length) |
| response.inner.length = event.ctrl.wLength; |
| usb_fuzzer_ep0_write(fd, (struct usb_fuzzer_ep_io*)&response); |
| sleep_ms(200); |
| return 0; |
| } |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| long res = 0; |
| *(uint8_t*)0x20000000 = 0x12; |
| *(uint8_t*)0x20000001 = 1; |
| *(uint16_t*)0x20000002 = 0; |
| *(uint8_t*)0x20000004 = 3; |
| *(uint8_t*)0x20000005 = 0x8c; |
| *(uint8_t*)0x20000006 = 0x39; |
| *(uint8_t*)0x20000007 = 8; |
| *(uint16_t*)0x20000008 = 0x4fa; |
| *(uint16_t*)0x2000000a = 0x2490; |
| *(uint16_t*)0x2000000c = 0x89a4; |
| *(uint8_t*)0x2000000e = 0; |
| *(uint8_t*)0x2000000f = 0; |
| *(uint8_t*)0x20000010 = 0; |
| *(uint8_t*)0x20000011 = 1; |
| *(uint8_t*)0x20000012 = 9; |
| *(uint8_t*)0x20000013 = 2; |
| *(uint16_t*)0x20000014 = 0x12; |
| *(uint8_t*)0x20000016 = 1; |
| *(uint8_t*)0x20000017 = 0; |
| *(uint8_t*)0x20000018 = 0; |
| *(uint8_t*)0x20000019 = 0; |
| *(uint8_t*)0x2000001a = 0; |
| *(uint8_t*)0x2000001b = 9; |
| *(uint8_t*)0x2000001c = 4; |
| *(uint8_t*)0x2000001d = 0xf9; |
| *(uint8_t*)0x2000001e = 0; |
| *(uint8_t*)0x2000001f = 0; |
| *(uint8_t*)0x20000020 = 0x17; |
| *(uint8_t*)0x20000021 = 0xc8; |
| *(uint8_t*)0x20000022 = 0x84; |
| *(uint8_t*)0x20000023 = 0; |
| res = syz_usb_connect(0x40000000000005, 0x24, 0x20000000, 0); |
| if (res != -1) |
| r[0] = res; |
| *(uint32_t*)0x20001680 = 0x54; |
| *(uint64_t*)0x20001684 = 0; |
| *(uint64_t*)0x2000168c = 0; |
| *(uint64_t*)0x20001694 = 0; |
| *(uint64_t*)0x2000169c = 0x200014c0; |
| *(uint8_t*)0x200014c0 = 0; |
| *(uint8_t*)0x200014c1 = 9; |
| *(uint32_t*)0x200014c2 = 0; |
| *(uint64_t*)0x200016a4 = 0; |
| *(uint64_t*)0x200016ac = 0; |
| *(uint64_t*)0x200016b4 = 0; |
| *(uint64_t*)0x200016bc = 0; |
| *(uint64_t*)0x200016c4 = 0; |
| *(uint64_t*)0x200016cc = 0; |
| syz_usb_control_io(r[0], 0, 0x20001680); |
| return 0; |
| } |