// https://syzkaller.appspot.com/bug?id=69bf3422c0eb7a37dec8c1a6c2d56ea40bf6bacf // 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_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; 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, bool* done) { 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; case USB_REQ_SET_CONFIGURATION: *response_length = 0; *response_data = NULL; *done = true; return true; 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) { int64_t speed = a0; int64_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_ep0_read(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; response_found = lookup_connect_response( descs, &index, &event.ctrl, &response_data, &response_length, &done); if (!response_found) { return -1; } 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) exit(1); } } struct usb_fuzzer_ep_io_data response; 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; rv = usb_fuzzer_ep0_write(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_ep0_read(fd, (struct usb_fuzzer_event*)&event); if (rv < 0) { return rv; } if (event.inner.type != USB_FUZZER_EVENT_CONTROL) { return -1; } if (!(event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength != 0) { } bool response_found = false; char* response_data = NULL; uint32_t response_length = 0; response_found = lookup_control_io_response(descs, resps, &event.ctrl, &response_data, &response_length); if (!response_found) { return -1; } struct usb_fuzzer_ep_io_data response; 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; rv = usb_fuzzer_ep0_write(fd, (struct usb_fuzzer_ep_io*)&response); if (rv < 0) { return rv; } sleep_ms(200); return 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[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint8_t*)0x20000040 = 0x12; *(uint8_t*)0x20000041 = 1; *(uint16_t*)0x20000042 = 0; *(uint8_t*)0x20000044 = 0x58; *(uint8_t*)0x20000045 = 0xad; *(uint8_t*)0x20000046 = 0xba; *(uint8_t*)0x20000047 = 8; *(uint16_t*)0x20000048 = 0x2040; *(uint16_t*)0x2000004a = 0x4982; *(uint16_t*)0x2000004c = 0xf9cf; *(uint8_t*)0x2000004e = 0; *(uint8_t*)0x2000004f = 0; *(uint8_t*)0x20000050 = 0; *(uint8_t*)0x20000051 = 1; *(uint8_t*)0x20000052 = 9; *(uint8_t*)0x20000053 = 2; *(uint16_t*)0x20000054 = 0x1b; *(uint8_t*)0x20000056 = 1; *(uint8_t*)0x20000057 = 0; *(uint8_t*)0x20000058 = 0; *(uint8_t*)0x20000059 = 0; *(uint8_t*)0x2000005a = 0; *(uint8_t*)0x2000005b = 9; *(uint8_t*)0x2000005c = 4; *(uint8_t*)0x2000005d = 0xc8; *(uint8_t*)0x2000005e = 0; *(uint8_t*)0x2000005f = 1; *(uint8_t*)0x20000060 = 0; *(uint8_t*)0x20000061 = 0xcb; *(uint8_t*)0x20000062 = 0x3f; *(uint8_t*)0x20000063 = 0; *(uint8_t*)0x20000064 = 7; *(uint8_t*)0x20000065 = 5; *(uint8_t*)0x20000066 = 0x84; *(uint8_t*)0x20000067 = 2; *(uint16_t*)0x20000068 = 0; *(uint8_t*)0x2000006a = 0; *(uint8_t*)0x2000006b = 0; *(uint8_t*)0x2000006c = 0; res = syz_usb_connect(0, 0x2d, 0x20000040, 0); if (res != -1) r[0] = res; *(uint32_t*)0x20000ec0 = 0x24; *(uint64_t*)0x20000ec4 = 0; *(uint64_t*)0x20000ecc = 0; *(uint64_t*)0x20000ed4 = 0; *(uint64_t*)0x20000edc = 0; *(uint32_t*)0x200010c0 = 0x24; *(uint64_t*)0x200010c4 = 0x20000f00; *(uint8_t*)0x20000f00 = 0x60; *(uint8_t*)0x20000f01 = 0x31; *(uint32_t*)0x20000f02 = 0xdd; memcpy((void*)0x20000f06, "\xe2\xc8\x00\x37\x02\x8a\xd4\xcc\x4f\xa1\x5b\x33\x89\xc8\x5b\x7b\x0a" "\x06\x09\xc4\x6c\x1f\x28\x42\x8c\x8c\x07\xdb\xe3\x8e\x69\x2a\x25\x5a" "\x2d\x59\x01\xa7\xc5\x50\xc9\x97\xe1\x15\xd1\x43\xf5\x2e\xfb\xd0\xfb" "\x22\x47\xfe\x7e\x94\x97\x77\x1d\x93\xce\xb5\xef\xff\xec\xa8\xad\x39" "\xd8\xc9\x3a\xc4\x7e\x24\xf7\x1a\x10\xd6\x5a\xbe\x98\xb6\xb7\x10\x65" "\x30\xaa\x48\x90\x27\x98\x49\x1a\x5b\x5a\x37\x0c\x5c\x18\x50\x25\x4a" "\x80\x9e\xdf\x24\x9a\xa6\xdb\xe7\xdb\x44\xac\x86\xa0\x94\xb7\xee\x69" "\xcd\x9c\x46\xb1\xbd\x41\x44\xdb\x66\x81\x17\x49\x21\x6c\xfe\x88\xf8" "\x07\xe5\x97\xb2\xf0\xea\xa6\x24\xe0\xc0\xc7\xa5\xd1\x8a\x91\xc8\x2f" "\x6c\x1b\xd0\x27\xd2\xa8\xad\x0f\x9a\xd9\x89\x4a\x96\x6b\x1c\x17\x18" "\xdd\x08\xc3\xe2\x31\xd5\xe6\xfa\x9e\x1e\xbf\x8c\x4c\x9e\x9a\xde\x27" "\xcc\xd3\x83\xc1\x47\x10\x5d\x18\x72\x42\xe6\x29\x11\xa5\x43\xee\x58" "\x97\xa2\xd4\xfb\x8d\xc7\x97\xda\x56\x9c\x98\xbd\x49\xdf\xea\x5f\xb1", 221); *(uint64_t*)0x200010cc = 0; *(uint64_t*)0x200010d4 = 0; *(uint64_t*)0x200010dc = 0; syz_usb_control_io(r[0], 0x20000ec0, 0x200010c0); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }