// https://syzkaller.appspot.com/bug?id=b0ecd43c452019e69e7866dd41efd9ef9d81ac30
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

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;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, 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(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  if (size > 0)
    memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static void netlink_nest(struct nlmsg* nlmsg, int typ)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_type = typ;
  nlmsg->pos += sizeof(*attr);
  nlmsg->nested[nlmsg->nesting++] = attr;
}

static void netlink_done(struct nlmsg* nlmsg)
{
  struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
  attr->nla_len = nlmsg->pos - (char*)attr;
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len, bool dofail)
{
  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;
  ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                     (struct sockaddr*)&addr, sizeof(addr));
  if (n != (ssize_t)hdr->nlmsg_len) {
    if (dofail)
      exit(1);
    return -1;
  }
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (reply_len)
    *reply_len = 0;
  if (n < 0) {
    if (dofail)
      exit(1);
    return -1;
  }
  if (n < (ssize_t)sizeof(struct nlmsghdr)) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type == NLMSG_DONE)
    return 0;
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type != NLMSG_ERROR) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  errno = -((struct nlmsgerr*)(hdr + 1))->error;
  return -errno;
}

static int netlink_send(struct nlmsg* nlmsg, int sock)
{
  return netlink_send_ext(nlmsg, sock, 0, NULL, true);
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
                                   const char* family_name, bool dofail)
{
  struct genlmsghdr genlhdr;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
               strnlen(family_name, GENL_NAMSIZ - 1) + 1);
  int n = 0;
  int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
  if (err < 0) {
    return -1;
  }
  uint16_t id = 0;
  struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                                         NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    errno = EINVAL;
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  return id;
}

static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
                                    const char* name, bool up)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr,
               sizeof(hdr));
  if (name)
    netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
  netlink_nest(nlmsg, IFLA_LINKINFO);
  netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}

static void netlink_device_change(struct nlmsg* nlmsg, int sock,
                                  const char* name, bool up, const char* master,
                                  const void* mac, int macsize,
                                  const char* new_name)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  hdr.ifi_index = if_nametoindex(name);
  netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
  if (new_name)
    netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
  if (master) {
    int ifindex = if_nametoindex(master);
    netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
  }
  if (macsize)
    netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static struct nlmsg nlmsg;

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int 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");
}

#define NL802154_CMD_SET_SHORT_ADDR 11
#define NL802154_ATTR_IFINDEX 3
#define NL802154_ATTR_SHORT_ADDR 10

static const char* setup_802154()
{
  const char* error = NULL;
  int sock_generic = -1;
  int sock_route = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (sock_route == -1) {
    error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) failed";
    goto fail;
  }
  sock_generic = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (sock_generic == -1) {
    error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) failed";
    goto fail;
  }
  {
    int nl802154_family_id =
        netlink_query_family_id(&nlmsg, sock_generic, "nl802154", true);
    if (nl802154_family_id < 0) {
      error = "netlink_query_family_id failed";
      goto fail;
    }
    for (int i = 0; i < 2; i++) {
      char devname[] = "wpan0";
      devname[strlen(devname) - 1] += i;
      uint64_t hwaddr = 0xaaaaaaaaaaaa0002 + (i << 8);
      uint16_t shortaddr = 0xaaa0 + i;
      int ifindex = if_nametoindex(devname);
      struct genlmsghdr genlhdr;
      memset(&genlhdr, 0, sizeof(genlhdr));
      genlhdr.cmd = NL802154_CMD_SET_SHORT_ADDR;
      netlink_init(&nlmsg, nl802154_family_id, 0, &genlhdr, sizeof(genlhdr));
      netlink_attr(&nlmsg, NL802154_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
      netlink_attr(&nlmsg, NL802154_ATTR_SHORT_ADDR, &shortaddr,
                   sizeof(shortaddr));
      if (netlink_send(&nlmsg, sock_generic) < 0) {
        error = "NL802154_CMD_SET_SHORT_ADDR failed";
        goto fail;
      }
      netlink_device_change(&nlmsg, sock_route, devname, true, 0, &hwaddr,
                            sizeof(hwaddr), 0);
      if (i == 0) {
        netlink_add_device_impl(&nlmsg, "lowpan", "lowpan0", false);
        netlink_done(&nlmsg);
        netlink_attr(&nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
        if (netlink_send(&nlmsg, sock_route) < 0) {
          error = "netlink: adding device lowpan0 type lowpan link wpan0";
          goto fail;
        }
      }
    }
  }
fail:
  close(sock_route);
  close(sock_generic);
  return error;
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; 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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  memfd_create arguments: [
  //    name: ptr[in, buffer] {
  //      buffer: {ff 00 6c 1e a0 3c 2f 00 8e 4f 34 2e 5f 14 7a 43 8a e8 e0 75
  //      e0 ff f1 b2 fd f6 6e 7a 05 2d 5d c2 56 6b ae 6b 79 d3 83 e2 c7 d3 e6
  //      4d 5e 98 6f 78 14 09 e9 51 31 1d 4b 9a 04 35 d3 37 b2 32 fd 44 28 d2
  //      dd 20 a0 ff 0f 00 00 00 00 00 00 76 0a d8 3f 5d 6b 14 4e 18 f4 c2 6a
  //      ed 36 67 fd d2 d4 e3 1f a6 20 a0 8d b5 9a 45 3c 32 60 5d 3c 8c 52 d6
  //      39 0f 4f bf c3 bd b0 96 90 91 6b 86 1a 10 d2 f5 8b fc 83 50 f4 d0 5b
  //      12 f5 2b 1a 53 02 2f 59 78 f2 6a 4a 62 97 9c 2f 1f 35 69 c6 86 31 9a
  //      ff c3 e7 bf 55 d5 ac cc 42 3d 8f fd 84 ee 70 51 93 6e 6e 0f c6 a9 3f
  //      ad 8b 7e d6 36 68 76 d3 24 13 73 a0 bf 69 fa 46 53 a9 3d 58 65 f8 74
  //      49 15 88 32 8b 8e 2d 58 b8 f2 9d 75 15 53 5e ec ce fa 87 24 53 9f e7
  //      45 64 0a 84 5c 20 75 d2 16 c1 a5 a0 aa e8 2e 69 c8 0e 0b 74 e2 f1 6c
  //      41 93 dd ce 8f 24 06 76 be e7 95 6e 4e c5 aa 1e 76 c6 50 9c 5c 47 26
  //      79 8b 59 41 c3 7d d9 86 5b b2 f3 0f 90 25 cb 81 e8 ea bc 73 95 e9 8e
  //      58 48 19 6d df 4f 59 f1 45 39 2d c8 e7 13 5e 2b 28 03 34 82 af 69 4f
  //      4f 14 8f 5e 8c 00 00 00 00 00 00 00 00 00 00 00 00 00 23 b9 46 2c 65
  //      fa d7 a2 eb b1 c9 be 23 92 f3 19 e6 83 28 fe f8 69 b9 c1 a0 77 ea bf
  //      e5 8d e9 14 13 30 c3 a5 7c 2f 5f 09 98 c3 a7 95 21 df 2a 07 d7 fc 76
  //      7c b3 5a 63 cf 7e f6 e2 a8 36 51 9a 24 80 85 8b 09 bf e6 28 12 e0 e1
  //      65 81 78 5d 61 14 35 a7 d2 0a 11 68 b9 f5 67 c4 25 26 ba 52 79 8f 85
  //      51 b9 57 e5 06 e2 b3 72 79 6b 7d 86 c6 04 03 69 10 a8 c4 cd 60 b8 cf
  //      54 29 29 b7 15 08 25 c8 75 43 28 43 01 1b 79 bf 20 10 e8 6b ea 80 d0
  //      50 7c 11 e5 b9 1d 5e 92 6a b0 a7 1d} (length 0x1ec)
  //    }
  //    flags: memfd_flags = 0x7 (8 bytes)
  //  ]
  //  returns fd_memfd
  memcpy(
      (void*)0x200000000800,
      "\377\000l\036\240</"
      "\000\216O4._\024zC\212\350\340u\340\377\361\262\375\366nz\005-]"
      "\302Vk\256ky\323\203\342\307\323\346M^"
      "\230ox\024\t\351Q1\035K\232\0045\3237\2622\375D(\322\335 "
      "\240\377\017\000\000\000\000\000\000v\n\330?]"
      "k\024N\030\364\302j\3556g\375\322\324\343\037\246 "
      "\240\215\265\232E<2`]<"
      "\214R\3269\017O\277\303\275\260\226\220\221k\206\032\020\322\365\213\374"
      "\203P\364\320[\022\365+\032S\002/Yx\362jJb\227\234/"
      "\0375i\306\2061\232\377\303\347\277U\325\254\314B="
      "\217\375\204\356pQ\223nn\017\306\251?\255\213~\3266hv\323$"
      "\023s\240\277i\372FS\251=Xe\370tI\025\2102\213\216-X\270\362\235u\025S^"
      "\354\316\372\207$S\237\347Ed\n\204\\ "
      "u\322\026\301\245\240\252\350.i\310\016\vt\342\361lA\223\335\316\217$"
      "\006v\276\347\225nN\305\252\036v\306P\234\\G&y\213YA\303}\331\206["
      "\262\363\017\220%\313\201\350\352\274s\225\351\216XH\031m\337OY\361E9-"
      "\310\347\023^+(\0034\202\257iOO\024\217^"
      "\214\000\000\000\000\000\000\000\000\000\000\000\000\000#\271F,"
      "e\372\327\242\353\261\311\276#\222\363\031\346\203("
      "\376\370i\271\301\240w\352\277\345\215\351\024\0230\303\245|/"
      "_\t\230\303\247\225!\337*\a\327\374v|\263Zc\317~\366\342\2506Q\232$"
      "\200\205\213\t\277\346(\022\340\341e\201x]"
      "a\0245\247\322\n\021h\271\365g\304%&"
      "\272Ry\217\205Q\271W\345\006\342\263ryk}"
      "\206\306\004\003i\020\250\304\315`\270\317T))\267\025\b%\310uC("
      "C\001\033y\277 "
      "\020\350k\352\200\320P|\021\345\271\035^\222j\260\247\035",
      492);
  res = syscall(__NR_memfd_create, /*name=*/0x200000000800ul,
                /*flags=MFD_HUGETLB|MFD_ALLOW_SEALING|MFD_CLOEXEC*/ 7ul);
  if (res != -1)
    r[0] = res;
  //  mmap arguments: [
  //    addr: VMA[0x2000]
  //    len: len = 0x2000 (8 bytes)
  //    prot: mmap_prot = 0xa (8 bytes)
  //    flags: mmap_flags = 0x4d091 (8 bytes)
  //    fd: fd (resource)
  //    offset: intptr = 0x4000000 (8 bytes)
  //  ]
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x2000ul,
          /*prot=PROT_SEM|PROT_WRITE*/ 0xaul,
          /*flags=MAP_POPULATE|MAP_NORESERVE|MAP_HUGETLB|MAP_FIXED|0x1081*/
          0x4d091ul, /*fd=*/r[0], /*offset=*/0x4000000ul);
  //  fcntl$addseals arguments: [
  //    fd: fd (resource)
  //    cmd: const = 0x409 (8 bytes)
  //    seals: seal_types = 0x2 (8 bytes)
  //  ]
  syscall(__NR_fcntl, /*fd=*/r[0], /*cmd=*/0x409ul,
          /*seals=F_SEAL_SHRINK*/ 2ul);
  //  openat$udambuf arguments: [
  //    fd: const = 0xffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 75 64 6d 61 62 75 66 00} (length 0xd)
  //    }
  //    flags: const = 0x2 (4 bytes)
  //  ]
  //  returns fd_udambuf
  memcpy((void*)0x200000000000, "/dev/udmabuf\000", 13);
  res = syscall(__NR_openat, /*fd=*/0xffffff9cul, /*file=*/0x200000000000ul,
                /*flags=*/2, 0);
  if (res != -1)
    r[1] = res;
  //  ioctl$UDMABUF_CREATE arguments: [
  //    fd: fd_udambuf (resource)
  //    cmd: const = 0x40187542 (4 bytes)
  //    arg: ptr[in, udmabuf_create] {
  //      udmabuf_create {
  //        memfd: fd_memfd (resource)
  //        flags: int32 = 0x0 (4 bytes)
  //        offset: udmabuf_offset_size = 0x0 (8 bytes)
  //        size: udmabuf_offset_size = 0x1000000 (8 bytes)
  //      }
  //    }
  //  ]
  //  returns fd_dma_buf
  *(uint32_t*)0x200000000040 = r[0];
  *(uint32_t*)0x200000000044 = 0;
  *(uint64_t*)0x200000000048 = 0;
  *(uint64_t*)0x200000000050 = 0x1000000;
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x40187542,
          /*arg=*/0x200000000040ul);
  //  preadv arguments: [
  //    fd: fd (resource)
  //    vec: ptr[in, array[iovec[out, array[int8]]]] {
  //      array[iovec[out, array[int8]]] {
  //        iovec[out, array[int8]] {
  //          addr: ptr[out, buffer] {
  //            buffer: (DirOut)
  //          }
  //          len: len = 0x6 (8 bytes)
  //        }
  //        iovec[out, array[int8]] {
  //          addr: nil
  //          len: len = 0x0 (8 bytes)
  //        }
  //        iovec[out, array[int8]] {
  //          addr: nil
  //          len: len = 0x0 (8 bytes)
  //        }
  //      }
  //    }
  //    vlen: len = 0x3 (8 bytes)
  //    off_low: int32 = 0xf (4 bytes)
  //    off_high: int32 = 0x0 (4 bytes)
  //  ]
  *(uint64_t*)0x200000000140 = 0x200000000080;
  *(uint64_t*)0x200000000148 = 6;
  *(uint64_t*)0x200000000150 = 0;
  *(uint64_t*)0x200000000158 = 0;
  *(uint64_t*)0x200000000160 = 0;
  *(uint64_t*)0x200000000168 = 0;
  syscall(__NR_preadv, /*fd=*/r[0], /*vec=*/0x200000000140ul, /*vlen=*/3ul,
          /*off_low=*/0xf, /*off_high=*/0);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_802154()))
    printf("the reproducer may not work as expected: 802154 injection setup "
           "failed: %s\n",
           reason);
  loop();
  return 0;
}