| // KMSAN: uninit-value in usb_hcd_flush_endpoint |
| // https://syzkaller.appspot.com/bug?id=1ef5bd6a2465d32c27f2ebf055562417c402fb01 |
| // status:invalid |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <net/if.h> |
| #include <net/if_arp.h> |
| #include <netinet/in.h> |
| #include <sched.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include <linux/capability.h> |
| #include <linux/if_addr.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_link.h> |
| #include <linux/if_tun.h> |
| #include <linux/in6.h> |
| #include <linux/ip.h> |
| #include <linux/neighbour.h> |
| #include <linux/net.h> |
| #include <linux/netlink.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/tcp.h> |
| #include <linux/usb/ch9.h> |
| #include <linux/veth.h> |
| |
| unsigned long long procid; |
| |
| static void sleep_ms(uint64_t ms) |
| { |
| usleep(ms * 1000); |
| } |
| |
| 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; |
| } |
| |
| static struct { |
| char* pos; |
| int nesting; |
| struct nlattr* nested[8]; |
| char buf[1024]; |
| } nlmsg; |
| |
| static void netlink_init(int typ, int flags, const void* data, int size) |
| { |
| memset(&nlmsg, 0, sizeof(nlmsg)); |
| struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg.buf; |
| hdr->nlmsg_type = typ; |
| hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; |
| memcpy(hdr + 1, data, size); |
| nlmsg.pos = (char*)(hdr + 1) + NLMSG_ALIGN(size); |
| } |
| |
| static void netlink_attr(int typ, const void* data, int size) |
| { |
| struct nlattr* attr = (struct nlattr*)nlmsg.pos; |
| attr->nla_len = sizeof(*attr) + size; |
| attr->nla_type = typ; |
| memcpy(attr + 1, data, size); |
| nlmsg.pos += NLMSG_ALIGN(attr->nla_len); |
| } |
| |
| static int netlink_send(int sock) |
| { |
| if (nlmsg.pos > nlmsg.buf + sizeof(nlmsg.buf) || nlmsg.nesting) |
| exit(1); |
| struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg.buf; |
| hdr->nlmsg_len = nlmsg.pos - nlmsg.buf; |
| struct sockaddr_nl addr; |
| memset(&addr, 0, sizeof(addr)); |
| addr.nl_family = AF_NETLINK; |
| unsigned n = sendto(sock, nlmsg.buf, hdr->nlmsg_len, 0, |
| (struct sockaddr*)&addr, sizeof(addr)); |
| if (n != hdr->nlmsg_len) |
| exit(1); |
| n = recv(sock, nlmsg.buf, sizeof(nlmsg.buf), 0); |
| if (n < sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr)) |
| exit(1); |
| if (hdr->nlmsg_type != NLMSG_ERROR) |
| exit(1); |
| return -((struct nlmsgerr*)(hdr + 1))->error; |
| } |
| |
| static void netlink_device_change(int sock, const char* name, bool up, |
| const char* master, const void* mac, |
| int macsize) |
| { |
| struct ifinfomsg hdr; |
| memset(&hdr, 0, sizeof(hdr)); |
| if (up) |
| hdr.ifi_flags = hdr.ifi_change = IFF_UP; |
| netlink_init(RTM_NEWLINK, 0, &hdr, sizeof(hdr)); |
| netlink_attr(IFLA_IFNAME, name, strlen(name)); |
| if (master) { |
| int ifindex = if_nametoindex(master); |
| netlink_attr(IFLA_MASTER, &ifindex, sizeof(ifindex)); |
| } |
| if (macsize) |
| netlink_attr(IFLA_ADDRESS, mac, macsize); |
| int err = netlink_send(sock); |
| (void)err; |
| } |
| |
| static int netlink_add_addr(int sock, const char* dev, const void* addr, |
| int addrsize) |
| { |
| struct ifaddrmsg hdr; |
| memset(&hdr, 0, sizeof(hdr)); |
| hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6; |
| hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120; |
| hdr.ifa_scope = RT_SCOPE_UNIVERSE; |
| hdr.ifa_index = if_nametoindex(dev); |
| netlink_init(RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr, sizeof(hdr)); |
| netlink_attr(IFA_LOCAL, addr, addrsize); |
| netlink_attr(IFA_ADDRESS, addr, addrsize); |
| return netlink_send(sock); |
| } |
| |
| static void netlink_add_addr4(int sock, const char* dev, const char* addr) |
| { |
| struct in_addr in_addr; |
| inet_pton(AF_INET, addr, &in_addr); |
| int err = netlink_add_addr(sock, dev, &in_addr, sizeof(in_addr)); |
| (void)err; |
| } |
| |
| static void netlink_add_addr6(int sock, const char* dev, const char* addr) |
| { |
| struct in6_addr in6_addr; |
| inet_pton(AF_INET6, addr, &in6_addr); |
| int err = netlink_add_addr(sock, dev, &in6_addr, sizeof(in6_addr)); |
| (void)err; |
| } |
| |
| static void netlink_add_neigh(int sock, const char* name, const void* addr, |
| int addrsize, const void* mac, int macsize) |
| { |
| struct ndmsg hdr; |
| memset(&hdr, 0, sizeof(hdr)); |
| hdr.ndm_family = addrsize == 4 ? AF_INET : AF_INET6; |
| hdr.ndm_ifindex = if_nametoindex(name); |
| hdr.ndm_state = NUD_PERMANENT; |
| netlink_init(RTM_NEWNEIGH, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr)); |
| netlink_attr(NDA_DST, addr, addrsize); |
| netlink_attr(NDA_LLADDR, mac, macsize); |
| int err = netlink_send(sock); |
| (void)err; |
| } |
| |
| static int tunfd = -1; |
| static int tun_frags_enabled; |
| #define SYZ_TUN_MAX_PACKET_SIZE 1000 |
| |
| #define TUN_IFACE "syz_tun" |
| |
| #define LOCAL_MAC 0xaaaaaaaaaaaa |
| #define REMOTE_MAC 0xaaaaaaaaaabb |
| |
| #define LOCAL_IPV4 "172.20.20.170" |
| #define REMOTE_IPV4 "172.20.20.187" |
| |
| #define LOCAL_IPV6 "fe80::aa" |
| #define REMOTE_IPV6 "fe80::bb" |
| |
| #define IFF_NAPI 0x0010 |
| #define IFF_NAPI_FRAGS 0x0020 |
| |
| static void initialize_tun(void) |
| { |
| tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK); |
| if (tunfd == -1) { |
| printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n"); |
| printf("otherwise fuzzing or reproducing might not work as intended\n"); |
| return; |
| } |
| const int kTunFd = 240; |
| if (dup2(tunfd, kTunFd) < 0) |
| exit(1); |
| close(tunfd); |
| tunfd = kTunFd; |
| struct ifreq ifr; |
| memset(&ifr, 0, sizeof(ifr)); |
| strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ); |
| ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS; |
| if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) { |
| ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
| if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) |
| exit(1); |
| } |
| if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0) |
| exit(1); |
| tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0; |
| char sysctl[64]; |
| sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE); |
| write_file(sysctl, "0"); |
| sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE); |
| write_file(sysctl, "0"); |
| int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| if (sock == -1) |
| exit(1); |
| netlink_add_addr4(sock, TUN_IFACE, LOCAL_IPV4); |
| netlink_add_addr6(sock, TUN_IFACE, LOCAL_IPV6); |
| uint64_t macaddr = REMOTE_MAC; |
| struct in_addr in_addr; |
| inet_pton(AF_INET, REMOTE_IPV4, &in_addr); |
| netlink_add_neigh(sock, TUN_IFACE, &in_addr, sizeof(in_addr), &macaddr, |
| ETH_ALEN); |
| struct in6_addr in6_addr; |
| inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr); |
| netlink_add_neigh(sock, TUN_IFACE, &in6_addr, sizeof(in6_addr), &macaddr, |
| ETH_ALEN); |
| macaddr = LOCAL_MAC; |
| netlink_device_change(sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN); |
| close(sock); |
| } |
| |
| #define USB_DEBUG 0 |
| |
| #define USB_MAX_IFACE_NUM 4 |
| #define USB_MAX_EP_NUM 32 |
| |
| struct usb_iface_index { |
| struct usb_interface_descriptor* iface; |
| struct usb_endpoint_descriptor* eps[USB_MAX_EP_NUM]; |
| unsigned eps_num; |
| }; |
| |
| struct usb_device_index { |
| struct usb_device_descriptor* dev; |
| struct usb_config_descriptor* config; |
| unsigned config_length; |
| struct usb_iface_index ifaces[USB_MAX_IFACE_NUM]; |
| unsigned ifaces_num; |
| }; |
| |
| static bool parse_usb_descriptor(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->config_length = length - sizeof(*index->dev); |
| 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; |
| } |
| 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) |
| iface->eps[iface->eps_num++] = |
| (struct usb_endpoint_descriptor*)(buffer + offset); |
| } |
| 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[] = {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(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 (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) { |
| struct usb_qualifier_descriptor* qual = |
| (struct usb_qualifier_descriptor*)response_data; |
| 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_length = sizeof(*qual); |
| return true; |
| } |
| *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.ifaces[0].eps_num; ep++) { |
| rv = usb_fuzzer_ep_enable(fd, index.ifaces[0].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 = 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; |
| } |
| |
| 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) && event.ctrl.wLength) { |
| 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; |
| 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_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 void setup_common() |
| { |
| if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { |
| } |
| } |
| |
| static void loop(); |
| |
| static void sandbox_common() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| setsid(); |
| struct rlimit rlim; |
| rlim.rlim_cur = rlim.rlim_max = (200 << 20); |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 32 << 20; |
| setrlimit(RLIMIT_MEMLOCK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 136 << 20; |
| setrlimit(RLIMIT_FSIZE, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 1 << 20; |
| setrlimit(RLIMIT_STACK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 0; |
| setrlimit(RLIMIT_CORE, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 256; |
| setrlimit(RLIMIT_NOFILE, &rlim); |
| if (unshare(CLONE_NEWNS)) { |
| } |
| if (unshare(CLONE_NEWIPC)) { |
| } |
| if (unshare(0x02000000)) { |
| } |
| if (unshare(CLONE_NEWUTS)) { |
| } |
| if (unshare(CLONE_SYSVSEM)) { |
| } |
| typedef struct { |
| const char* name; |
| const char* value; |
| } sysctl_t; |
| static const sysctl_t sysctls[] = { |
| {"/proc/sys/kernel/shmmax", "16777216"}, |
| {"/proc/sys/kernel/shmall", "536870912"}, |
| {"/proc/sys/kernel/shmmni", "1024"}, |
| {"/proc/sys/kernel/msgmax", "8192"}, |
| {"/proc/sys/kernel/msgmni", "1024"}, |
| {"/proc/sys/kernel/msgmnb", "1024"}, |
| {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, |
| }; |
| unsigned i; |
| for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) |
| write_file(sysctls[i].name, sysctls[i].value); |
| } |
| |
| int wait_for_loop(int pid) |
| { |
| if (pid < 0) |
| exit(1); |
| int status = 0; |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| return WEXITSTATUS(status); |
| } |
| |
| static void drop_caps(void) |
| { |
| struct __user_cap_header_struct cap_hdr = {}; |
| struct __user_cap_data_struct cap_data[2] = {}; |
| cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; |
| cap_hdr.pid = getpid(); |
| if (syscall(SYS_capget, &cap_hdr, &cap_data)) |
| exit(1); |
| const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); |
| cap_data[0].effective &= ~drop; |
| cap_data[0].permitted &= ~drop; |
| cap_data[0].inheritable &= ~drop; |
| if (syscall(SYS_capset, &cap_hdr, &cap_data)) |
| exit(1); |
| } |
| |
| static int do_sandbox_none(void) |
| { |
| if (unshare(CLONE_NEWPID)) { |
| } |
| int pid = fork(); |
| if (pid != 0) |
| return wait_for_loop(pid); |
| setup_common(); |
| sandbox_common(); |
| drop_caps(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| initialize_tun(); |
| loop(); |
| exit(1); |
| } |
| |
| static void close_fds() |
| { |
| int fd; |
| for (fd = 3; fd < 30; fd++) |
| close(fd); |
| } |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| |
| void loop(void) |
| { |
| intptr_t res = 0; |
| memcpy((void*)0x200000c0, |
| "\x12\x01\x00\x00\x1e\x95\xcd\x10\xcf\x12\x11\x71\x08\x48\x00\x00\x00" |
| "\x01\x09\x02\x1b\x00\x01\x00\x00\x00\x00\x09\x04\x80\x00\x01\x03\x00" |
| "\x00\x00\x07\x05\x84\x0b\x00\xe3\xff\xff\xff\x3d\x8a\xd2\x17\x47\x28" |
| "\xba\x82\x62\xea\x79\x49\xfb\x78\x41\x62\x32\x0e\xe1\x68\x71\x12\x59" |
| "\x58\x4c\x68\x27\x6f\x44\x4a\x2a\xb8\x47\xc9\xf8\x6b\x66\xc3\x2f\x2f" |
| "\x07\x75\x1e\x6c\xf6\x12\xfe\x26\x01\x30\x84\xa3\xc4\xfd\x53\xfa\xcc" |
| "\x42\x5f\x32\x46\x38\x78\x10\x3c\x47\xcf\xcf\xfa\x1b\x4c\xdf\xb0\x29" |
| "\xff\x87\x83\x71\x59\x8b\x2a\x54\x81\x18\x99\x94\xc4\x90\xd5\xe2\x7c" |
| "\xa0\xf6\x38\x04\x03\xb3\x51\xf8\xc0\xef\x8a\xfd", |
| 148); |
| res = syz_usb_connect(0, 0x2d, 0x200000c0, 0); |
| if (res != -1) |
| r[0] = res; |
| *(uint32_t*)0x20000900 = 0xac; |
| *(uint64_t*)0x20000904 = 0x20000080; |
| *(uint8_t*)0x20000080 = 0; |
| *(uint8_t*)0x20000081 = 0; |
| *(uint32_t*)0x20000082 = 0; |
| *(uint64_t*)0x2000090c = 0; |
| *(uint64_t*)0x20000914 = 0; |
| *(uint64_t*)0x2000091c = 0; |
| *(uint64_t*)0x20000924 = 0; |
| *(uint64_t*)0x2000092c = 0; |
| *(uint64_t*)0x20000934 = 0; |
| *(uint64_t*)0x2000093c = 0; |
| *(uint64_t*)0x20000944 = 0; |
| *(uint64_t*)0x2000094c = 0; |
| *(uint64_t*)0x20000954 = 0; |
| *(uint64_t*)0x2000095c = 0; |
| *(uint64_t*)0x20000964 = 0; |
| *(uint64_t*)0x2000096c = 0; |
| *(uint64_t*)0x20000974 = 0; |
| *(uint64_t*)0x2000097c = 0; |
| *(uint64_t*)0x20000984 = 0; |
| *(uint64_t*)0x2000098c = 0; |
| *(uint64_t*)0x20000994 = 0; |
| *(uint64_t*)0x2000099c = 0; |
| *(uint64_t*)0x200009a4 = 0; |
| syz_usb_control_io(r[0], 0, 0x20000900); |
| *(uint32_t*)0x20000500 = 0xac; |
| *(uint64_t*)0x20000504 = 0x200003c0; |
| *(uint64_t*)0x2000050c = 0; |
| *(uint64_t*)0x20000514 = 0; |
| *(uint64_t*)0x2000051c = 0; |
| *(uint64_t*)0x20000524 = 0; |
| *(uint64_t*)0x2000052c = 0; |
| *(uint64_t*)0x20000534 = 0; |
| *(uint64_t*)0x2000053c = 0; |
| *(uint64_t*)0x20000544 = 0; |
| *(uint64_t*)0x2000054c = 0; |
| *(uint64_t*)0x20000554 = 0; |
| *(uint64_t*)0x2000055c = 0; |
| *(uint64_t*)0x20000564 = 0; |
| *(uint64_t*)0x2000056c = 0; |
| *(uint64_t*)0x20000574 = 0; |
| *(uint64_t*)0x2000057c = 0; |
| *(uint64_t*)0x20000584 = 0; |
| *(uint64_t*)0x2000058c = 0; |
| *(uint64_t*)0x20000594 = 0; |
| *(uint64_t*)0x2000059c = 0; |
| *(uint64_t*)0x200005a4 = 0; |
| syz_usb_control_io(r[0], 0, 0x20000500); |
| close_fds(); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| do_sandbox_none(); |
| return 0; |
| } |