// https://syzkaller.appspot.com/bug?id=bd1dc4784ff2c89f9d35cd17b02a4a0e1baa1df4 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include unsigned long long procid; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ { \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ } 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 + 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_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 += desc_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_EVENT_FETCH _IOR('U', 2, struct usb_fuzzer_event) #define USB_FUZZER_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_fuzzer_ep_io) #define USB_FUZZER_IOCTL_EP0_READ _IOWR('U', 4, struct usb_fuzzer_ep_io) #define USB_FUZZER_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor) #define USB_FUZZER_IOCTL_EP_WRITE _IOW('U', 7, struct usb_fuzzer_ep_io) #define USB_FUZZER_IOCTL_EP_READ _IOWR('U', 8, struct usb_fuzzer_ep_io) #define USB_FUZZER_IOCTL_CONFIGURE _IO('U', 9) #define USB_FUZZER_IOCTL_VBUS_DRAW _IOW('U', 10, 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_event_fetch(int fd, struct usb_fuzzer_event* event) { return ioctl(fd, USB_FUZZER_IOCTL_EVENT_FETCH, 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_ep0_read(int fd, struct usb_fuzzer_ep_io* io) { return ioctl(fd, USB_FUZZER_IOCTL_EP0_READ, 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_read(int fd, struct usb_fuzzer_ep_io* io) { return ioctl(fd, USB_FUZZER_IOCTL_EP_READ, 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; char data[USB_MAX_PACKET_SIZE]; }; 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 bool lookup_connect_response(struct vusb_connect_descriptors* descs, struct usb_device_index* index, struct usb_ctrlrequest* ctrl, char** response_data, uint32_t* response_length) { uint8_t str_idx; 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 (str_idx >= descs->strs_len && descs->strs_len > 0) { str_idx = descs->strs_len - 1; } *response_data = descs->strs[str_idx].str; *response_length = descs->strs[str_idx].len; return true; case USB_DT_BOS: *response_data = descs->bos; *response_length = descs->bos_len; return true; case USB_DT_DEVICE_QUALIFIER: *response_data = descs->qual; *response_length = descs->qual_len; return true; default: exit(1); return false; } break; default: exit(1); return false; } break; default: exit(1); return false; } return false; } 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; char* dev = (char*)a2; struct vusb_connect_descriptors* descs = (struct vusb_connect_descriptors*)a3; if (!dev) { return -1; } struct usb_device_index index; memset(&index, 0, sizeof(index)); int rv = 0; NONFAILING(rv = parse_usb_descriptor(dev, dev_len, &index)); if (!rv) { return rv; } int fd = usb_fuzzer_open(); if (fd < 0) { return fd; } char device[32]; sprintf(&device[0], "dummy_udc.%llu", procid); rv = usb_fuzzer_init(fd, speed, "dummy_udc", &device[0]); if (rv < 0) { return rv; } rv = usb_fuzzer_run(fd); if (rv < 0) { return rv; } bool done = false; while (!done) { struct usb_fuzzer_control_event event; event.inner.type = 0; event.inner.length = sizeof(event.ctrl); rv = usb_fuzzer_event_fetch(fd, (struct usb_fuzzer_event*)&event); if (rv < 0) { return rv; } if (event.inner.type != USB_FUZZER_EVENT_CONTROL) continue; bool response_found = false; char* response_data = NULL; uint32_t response_length = 0; if (event.ctrl.bRequestType & USB_DIR_IN) { NONFAILING(response_found = lookup_connect_response(descs, &index, &event.ctrl, &response_data, &response_length)); if (!response_found) { return -1; } } else { if ((event.ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD || event.ctrl.bRequest != USB_REQ_SET_CONFIGURATION) { exit(1); return -1; } done = true; } if (done) { rv = usb_fuzzer_vbus_draw(fd, index.config->bMaxPower); if (rv < 0) { return rv; } rv = usb_fuzzer_configure(fd); if (rv < 0) { return rv; } unsigned ep; for (ep = 0; ep < index.eps_num; ep++) { rv = usb_fuzzer_ep_enable(fd, index.eps[ep]); if (rv < 0) { } else { } } } struct usb_fuzzer_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_fuzzer_ep0_write(fd, (struct usb_fuzzer_ep_io*)&response); else rv = usb_fuzzer_ep0_read(fd, (struct usb_fuzzer_ep_io*)&response); if (rv < 0) { return rv; } } 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 bool lookup_control_io_response(struct vusb_descriptors* descs, struct vusb_responses* resps, struct usb_ctrlrequest* ctrl, char** response_data, uint32_t* response_length) { int descs_num = (descs->len - offsetof(struct vusb_descriptors, descs)) / sizeof(descs->descs[0]); int 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->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->generic) { *response_data = &resps->generic->data[0]; *response_length = resps->generic->len; return true; } } return false; } 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 = USB_MAX_PACKET_SIZE; int rv = usb_fuzzer_event_fetch(fd, (struct usb_fuzzer_event*)&event); if (rv < 0) { return rv; } if (event.inner.type != USB_FUZZER_EVENT_CONTROL) { return -1; } bool response_found = false; char* response_data = NULL; uint32_t response_length = 0; if (event.ctrl.bRequestType & USB_DIR_IN) { NONFAILING( response_found = lookup_control_io_response( descs, resps, &event.ctrl, &response_data, &response_length)); if (!response_found) { return -1; } } else { response_length = event.ctrl.wLength; } struct usb_fuzzer_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_fuzzer_ep0_write(fd, (struct usb_fuzzer_ep_io*)&response); } else { rv = usb_fuzzer_ep0_read(fd, (struct usb_fuzzer_ep_io*)&response); } if (rv < 0) { return rv; } sleep_ms(200); return 0; } uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); install_segv_handler(); intptr_t res = 0; NONFAILING(*(uint8_t*)0x20000d40 = 0x12); NONFAILING(*(uint8_t*)0x20000d41 = 1); NONFAILING(*(uint16_t*)0x20000d42 = 0); NONFAILING(*(uint8_t*)0x20000d44 = 0x58); NONFAILING(*(uint8_t*)0x20000d45 = 0x35); NONFAILING(*(uint8_t*)0x20000d46 = 0x54); NONFAILING(*(uint8_t*)0x20000d47 = 8); NONFAILING(*(uint16_t*)0x20000d48 = 0x5ef); NONFAILING(*(uint16_t*)0x20000d4a = 0x8884); NONFAILING(*(uint16_t*)0x20000d4c = 0x9028); NONFAILING(*(uint8_t*)0x20000d4e = 0); NONFAILING(*(uint8_t*)0x20000d4f = 0); NONFAILING(*(uint8_t*)0x20000d50 = 0); NONFAILING(*(uint8_t*)0x20000d51 = 1); NONFAILING(*(uint8_t*)0x20000d52 = 9); NONFAILING(*(uint8_t*)0x20000d53 = 2); NONFAILING(*(uint16_t*)0x20000d54 = 0x64); NONFAILING(*(uint8_t*)0x20000d56 = 1); NONFAILING(*(uint8_t*)0x20000d57 = 0); NONFAILING(*(uint8_t*)0x20000d58 = 0); NONFAILING(*(uint8_t*)0x20000d59 = 0); NONFAILING(*(uint8_t*)0x20000d5a = 0); NONFAILING(*(uint8_t*)0x20000d5b = 9); NONFAILING(*(uint8_t*)0x20000d5c = 4); NONFAILING(*(uint8_t*)0x20000d5d = 0x8f); NONFAILING(*(uint8_t*)0x20000d5e = 0); NONFAILING(*(uint8_t*)0x20000d5f = 8); NONFAILING(*(uint8_t*)0x20000d60 = 0x3d); NONFAILING(*(uint8_t*)0x20000d61 = 0xb2); NONFAILING(*(uint8_t*)0x20000d62 = 0xdc); NONFAILING(*(uint8_t*)0x20000d63 = 0); NONFAILING(*(uint8_t*)0x20000d64 = 9); NONFAILING(*(uint8_t*)0x20000d65 = 5); NONFAILING(*(uint8_t*)0x20000d66 = 0xe); NONFAILING(*(uint8_t*)0x20000d67 = 3); NONFAILING(*(uint16_t*)0x20000d68 = 0x3f); NONFAILING(*(uint8_t*)0x20000d6a = 0); NONFAILING(*(uint8_t*)0x20000d6b = 1); NONFAILING(*(uint8_t*)0x20000d6c = 3); NONFAILING(*(uint8_t*)0x20000d6d = 9); NONFAILING(*(uint8_t*)0x20000d6e = 5); NONFAILING(*(uint8_t*)0x20000d6f = 0x80); NONFAILING(*(uint8_t*)0x20000d70 = 1); NONFAILING(*(uint16_t*)0x20000d71 = 0x400); NONFAILING(*(uint8_t*)0x20000d73 = 0xfe); NONFAILING(*(uint8_t*)0x20000d74 = 1); NONFAILING(*(uint8_t*)0x20000d75 = 1); NONFAILING(*(uint8_t*)0x20000d76 = 9); NONFAILING(*(uint8_t*)0x20000d77 = 5); NONFAILING(*(uint8_t*)0x20000d78 = 0xf); NONFAILING(*(uint8_t*)0x20000d79 = 0); NONFAILING(*(uint16_t*)0x20000d7a = 6); NONFAILING(*(uint8_t*)0x20000d7c = 0x94); NONFAILING(*(uint8_t*)0x20000d7d = 8); NONFAILING(*(uint8_t*)0x20000d7e = 1); NONFAILING(*(uint8_t*)0x20000d7f = 2); NONFAILING(*(uint8_t*)0x20000d80 = 0); NONFAILING(*(uint8_t*)0x20000d81 = 9); NONFAILING(*(uint8_t*)0x20000d82 = 5); NONFAILING(*(uint8_t*)0x20000d83 = 6); NONFAILING(*(uint8_t*)0x20000d84 = 0x10); NONFAILING(*(uint16_t*)0x20000d85 = 0x98a); NONFAILING(*(uint8_t*)0x20000d87 = 0); NONFAILING(*(uint8_t*)0x20000d88 = 9); NONFAILING(*(uint8_t*)0x20000d89 = 1); NONFAILING(*(uint8_t*)0x20000d8a = 2); NONFAILING(*(uint8_t*)0x20000d8b = 0xf); NONFAILING(*(uint8_t*)0x20000d8c = 2); NONFAILING(*(uint8_t*)0x20000d8d = 0xa); NONFAILING(*(uint8_t*)0x20000d8e = 9); NONFAILING(*(uint8_t*)0x20000d8f = 5); NONFAILING(*(uint8_t*)0x20000d90 = 0xa); NONFAILING(*(uint8_t*)0x20000d91 = 0x1f); NONFAILING(*(uint16_t*)0x20000d92 = 0); NONFAILING(*(uint8_t*)0x20000d94 = 7); NONFAILING(*(uint8_t*)0x20000d95 = 3); NONFAILING(*(uint8_t*)0x20000d96 = 0x3f); NONFAILING(*(uint8_t*)0x20000d97 = 2); NONFAILING(*(uint8_t*)0x20000d98 = 0x24); NONFAILING(*(uint8_t*)0x20000d99 = 9); NONFAILING(*(uint8_t*)0x20000d9a = 5); NONFAILING(*(uint8_t*)0x20000d9b = 5); NONFAILING(*(uint8_t*)0x20000d9c = 0); NONFAILING(*(uint16_t*)0x20000d9d = 0x2e); NONFAILING(*(uint8_t*)0x20000d9f = 8); NONFAILING(*(uint8_t*)0x20000da0 = 7); NONFAILING(*(uint8_t*)0x20000da1 = 0); NONFAILING(*(uint8_t*)0x20000da2 = 9); NONFAILING(*(uint8_t*)0x20000da3 = 5); NONFAILING(*(uint8_t*)0x20000da4 = 0xf); NONFAILING(*(uint8_t*)0x20000da5 = 3); NONFAILING(*(uint16_t*)0x20000da6 = 2); NONFAILING(*(uint8_t*)0x20000da8 = 8); NONFAILING(*(uint8_t*)0x20000da9 = 3); NONFAILING(*(uint8_t*)0x20000daa = 0x9c); NONFAILING(*(uint8_t*)0x20000dab = 9); NONFAILING(*(uint8_t*)0x20000dac = 5); NONFAILING(*(uint8_t*)0x20000dad = 0xf); NONFAILING(*(uint8_t*)0x20000dae = 3); NONFAILING(*(uint16_t*)0x20000daf = 9); NONFAILING(*(uint8_t*)0x20000db1 = 3); NONFAILING(*(uint8_t*)0x20000db2 = 7); NONFAILING(*(uint8_t*)0x20000db3 = 9); NONFAILING(*(uint8_t*)0x20000db4 = 2); NONFAILING(*(uint8_t*)0x20000db5 = 0xb); res = syz_usb_connect(0, 0x76, 0x20000d40, 0); if (res != -1) r[0] = res; syz_usb_control_io(r[0], 0, 0); syz_usb_control_io(r[0], 0, 0); return 0; }