// https://syzkaller.appspot.com/bug?id=0141bd6b37153edec9c4ffa0f0e990c7228897f9 // 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 #include #include #include unsigned long long procid; static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } #define USB_DEBUG 0 #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 const char* default_string = "syzkaller"; 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) { *response_data = (char*)default_string; *response_length = strlen(default_string); } else { *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; 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) { 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_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) { response_found = lookup_control_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; } static volatile long syz_usb_disconnect(volatile long a0) { int fd = a0; int rv = close(fd); sleep_ms(200); return rv; } static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy( (void*)0x20000400, "\x12\x01\x00\x00\x00\x00\x00\x20\x6d\x04\x1c\xc7\x40\x00\x00\x00\x00\x01" "\x09\x02\x24\x00\x01\x00\x00\xa0\x00\x09\x04\x00\x00\x09\x03\x01\x01\x00" "\x09\x21\x00\x00\x00\x01\x22\x15\x00\x09\x05\x81\x03\x00\x00\x00\x00\x00" "\xee\xb4\x88\x8f\xff\xfc\x1f\xe0\x2d\xa3\x65\xa9\xc4\xce\xfe\x8b\x90\x61" "\x70\x1c\x3c\xcd\x35\x2d\x15\x83\x2b\xe2\x59\x85\x90\x20\x08\x5b\x4a\x55" "\x25\xda\xaa\xfd\xc4\x9f\x59\x66\xf9\x00\x63\x4c\x11\xc5\x62\x10\x23\x5d" "\xca\x74\xb0\x5a\xbe\xdf\x3b\x46\xe5\xd9\x29\x2b\x05\x00\xe1\x8c\x4a\x00" "\x00\x00\x00\x9c\xc7\x04\xcc\x79\x15\x55\x97\x94\x80\x5a\x7a\xb1\x3d\x44" "\x84\x90\xdb\xac\xf2\x68\xac\x24\x72\x3a\xcf\x3c\xa4\x84\x0a\xf0\x39\xb7" "\xf9\xb8\x36\xbd\xe4\x66\xbe\x4d\x32\x35\x99\x80\x1b\x61\xa4\xa4\xfd\x48" "\x44\xf9\xeb\xc1\xd2\xc0\x99\xd1\x74\x7d\x8a\x91\xb7\x62\xf8\x21\x02\x49" "\x1b\x72\x36\x20\xa3\xb8\x27\x0a\x84\x5f\xf9\xf1\xc3\xb2\x59\x2b\x1c\x7b" "\xf2\x32\x64\xe0\x73\x61\x9b\x76\x05\xc4\x6f\xe4\x0f\xa7\xc3\xf5\x04\xd8" "\xc8\xea\x34\xf3\xb2\x2e\x92\x00\x55\xf2\x4e\x2e\xb6\x78\xb7\x27\xfb\x1a" "\xc5\xfd\x57\x81\x44\xe9\x37\xfd\x37\xa0\xd3\xc6\x04\x6a\xbd\xe8\x52\x6b" "\x5f\xca\xf1\x40\xe7\xf4\x81\x2a\x08\x24\xfa\x5f\x4d\x83\x94\x8b\xa6\x68" "\xf5\x6a\xe3\xe8\x62\x0d\x99\xb9\xc1\xf7\x85\x82\x65\x28\x78\x50\x84\x94" "\xe0\xc4\x14\xf9\x8f\x00\x11\xe4\x80\x59\xb8\x75\x82\x9a\x88\x8f\xe1\x7b" "\x21\xdf\xa2\x20\x06\xeb\xc7\x72\x17\x4d\x01\x54\x90\xa6\x44\x73\xe4\xc9" "\x35\x70\x45\x01\x30\x1c\xf5\x2e\xd2\x74\x04\xac\x30\xd1\x8c\xbb\xee\xe2" "\x4d\x2b\x8f\x6e\x05\x9c\x28\x8d\x50\xcc\x67\xf3\x86\x7c\xe5\x40\x31\xe1" "\x90\x5d\xc7\xc5\xea\xa2\x6b\xe3\xf4\x42\xf0\x3b\x58\xa2\x86\xa0\xfd\xf0" "\xf9\xf5\x56\xb7\x2c\xe8\x9f\x13\xbc\xd8\xe8\x93\xda\x40\x0a\xd1\x31\x8d" "\x76\xa8\x62\xa7\x6f\xb7\xa1\x49\xaf\x39\x37\x9d\x9f\x4e\xdf\x33\xe0\x83" "\xb8\x26\x9d\xa2\x4c\xc9\xf0\x90\xff\xe7\xeb\x07\x8a\x60\x50\x1f\x47\x43" "\x95\x46\x5e\x68\x7f\x67\xcf\xef\x7b\xc9\x04\x42\xc4\x2d\x43\xd1\x08\x41" "\x3a\x24\xdc\x94\x25\xf0\xb3\x26\xc2\xf3\x75\x9c\xb7\x96\xfa\x6a\x86\x75" "\x57\x55\x08\x49\xb6\xc9\xc5\xa3\x4b\x7a\x64\x98\xeb\xd5\x0e\x4e\x0c\xe1" "\xda\x1d\x05\x8d\xeb\x3d\x42\x44\x73\x32\xcb\xbd\xe6\xec\xc1\x23\xcc\x2e" "\x4d\x4d\x3e\x50\x2b\xdd\xa0\xdb\xc9\x54\x78\xa0\x2c\xef\xc6\xdf\x24\x2c" "\xca\x03\x8f\xc4\x38\x36\x94\xde\x69\x8b\xec\xde\xeb\xdc\xe5\x9a\x82\xff" "\x59\x44\x83\x31\x9b\x51\xea\xed\xd1\x51\xc3\xf8\x9f\x28\x21\x22\x45\xf0" "\xc8\xa4\x1d\x0d\x95\x7b\x4c\x11\xb9\x04\xab\x8a\x11\x46\x43\x88\x31\x63" "\xb1\x68\x27\x5d\xc3\x8b\x0d\x9d\x64\xfc\xc9\xd1\x62\x3f\xcb\xf0\x7e\x5a" "\x33\x6a\x0f\x00\x00\x00\x00\x00\x00\x0a\x37\x25\x33\x11\x27\x6f\xf7\x04" "\x39\xc7\x6d\xef\xb6\x22\x9b\xb9\x59\xb0\x07\xf3\x41\xce\x76\x6c\x42\x91" "\x20\x98\x57\x70\x75\x9f\x34\xda\x7c\x1c\x5f\x0b\xbc\x9c\xac\xbf\x7f\xe7" "\x09\x00\x00\x00\xc5\x5a\x93\xdc\xf8\x42\x86\x4e\x00\x00\x00", 681); res = syz_usb_connect(0, 0x36, 0x20000400, 0); if (res != -1) r[0] = res; syz_usb_control_io(r[0], 0, 0); *(uint32_t*)0x20000340 = 0x34; *(uint64_t*)0x20000344 = 0; *(uint64_t*)0x2000034c = 0; *(uint64_t*)0x20000354 = 0; *(uint64_t*)0x2000035c = 0x20000380; memcpy((void*)0x20000380, "\x00\x22\x15\x00\x00\x00\x8e\x03\xdd\x03\x4f\x4e\x37\x85\x15\xe0\x81", 17); *(uint32_t*)0x20001bc0 = 0xcc; *(uint64_t*)0x20001bc4 = 0; *(uint64_t*)0x20001bcc = 0; *(uint64_t*)0x20001bd4 = 0; *(uint64_t*)0x20001bdc = 0; *(uint64_t*)0x20001be4 = 0; syz_usb_control_io(r[0], 0x20000340, 0x20001bc0); memcpy((void*)0x200002c0, "/dev/hidraw#\000", 13); res = syz_open_dev(0x200002c0, 0, 1); if (res != -1) r[1] = res; syz_usb_disconnect(r[0]); syscall(__NR_ioctl, r[1], 0x80404805, 0); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }