// https://syzkaller.appspot.com/bug?id=576c3908d9a4ea5c58a2b8e26f5fe7e8875a122c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif
#ifndef __NR_io_uring_enter
#define __NR_io_uring_enter 426
#endif
#ifndef __NR_io_uring_setup
#define __NR_io_uring_setup 425
#endif

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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 SIZEOF_IO_URING_SQE 64
#define SIZEOF_IO_URING_CQE 16
#define SQ_HEAD_OFFSET 0
#define SQ_TAIL_OFFSET 64
#define SQ_RING_MASK_OFFSET 256
#define SQ_RING_ENTRIES_OFFSET 264
#define SQ_FLAGS_OFFSET 276
#define SQ_DROPPED_OFFSET 272
#define CQ_HEAD_OFFSET 128
#define CQ_TAIL_OFFSET 192
#define CQ_RING_MASK_OFFSET 260
#define CQ_RING_ENTRIES_OFFSET 268
#define CQ_RING_OVERFLOW_OFFSET 284
#define CQ_FLAGS_OFFSET 280
#define CQ_CQES_OFFSET 320

struct io_sqring_offsets {
  uint32_t head;
  uint32_t tail;
  uint32_t ring_mask;
  uint32_t ring_entries;
  uint32_t flags;
  uint32_t dropped;
  uint32_t array;
  uint32_t resv1;
  uint64_t resv2;
};

struct io_cqring_offsets {
  uint32_t head;
  uint32_t tail;
  uint32_t ring_mask;
  uint32_t ring_entries;
  uint32_t overflow;
  uint32_t cqes;
  uint64_t resv[2];
};

struct io_uring_params {
  uint32_t sq_entries;
  uint32_t cq_entries;
  uint32_t flags;
  uint32_t sq_thread_cpu;
  uint32_t sq_thread_idle;
  uint32_t features;
  uint32_t resv[4];
  struct io_sqring_offsets sq_off;
  struct io_cqring_offsets cq_off;
};

#define IORING_OFF_SQ_RING 0
#define IORING_OFF_SQES 0x10000000ULL
#define IORING_SETUP_SQE128 (1U << 10)
#define IORING_SETUP_CQE32 (1U << 11)

static long syz_io_uring_setup(volatile long a0, volatile long a1,
                               volatile long a2, volatile long a3)
{
  uint32_t entries = (uint32_t)a0;
  struct io_uring_params* setup_params = (struct io_uring_params*)a1;
  void** ring_ptr_out = (void**)a2;
  void** sqes_ptr_out = (void**)a3;
  setup_params->flags &= ~(IORING_SETUP_CQE32 | IORING_SETUP_SQE128);
  uint32_t fd_io_uring = syscall(__NR_io_uring_setup, entries, setup_params);
  uint32_t sq_ring_sz =
      setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
  uint32_t cq_ring_sz = setup_params->cq_off.cqes +
                        setup_params->cq_entries * SIZEOF_IO_URING_CQE;
  uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
  *ring_ptr_out =
      mmap(0, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE,
           fd_io_uring, IORING_OFF_SQ_RING);
  uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
  *sqes_ptr_out = mmap(0, sqes_sz, PROT_READ | PROT_WRITE,
                       MAP_SHARED | MAP_POPULATE, fd_io_uring, IORING_OFF_SQES);
  uint32_t* array =
      (uint32_t*)((uintptr_t)*ring_ptr_out + setup_params->sq_off.array);
  for (uint32_t index = 0; index < entries; index++)
    array[index] = index;
  return fd_io_uring;
}

static long syz_io_uring_submit(volatile long a0, volatile long a1,
                                volatile long a2)
{
  char* ring_ptr = (char*)a0;
  char* sqes_ptr = (char*)a1;
  char* sqe = (char*)a2;
  uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + SQ_RING_MASK_OFFSET);
  uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + SQ_TAIL_OFFSET);
  uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
  char* sqe_dest = sqes_ptr + sq_tail * SIZEOF_IO_URING_SQE;
  memcpy(sqe_dest, sqe, SIZEOF_IO_URING_SQE);
  uint32_t sq_tail_next = *sq_tail_ptr + 1;
  __atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
  return 0;
}

static long syz_memcpy_off(volatile long a0, volatile long a1, volatile long a2,
                           volatile long a3, volatile long a4)
{
  char* dest = (char*)a0;
  uint32_t dest_off = (uint32_t)a1;
  char* src = (char*)a2;
  uint32_t src_off = (uint32_t)a3;
  size_t n = (size_t)a4;
  return (long)memcpy(dest + dest_off, src + src_off, n);
}

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);
  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");
}

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[7] = {0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0x0,
                 0x0,
                 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  syscall(__NR_ioperm, /*from=*/0xfffffffffffff2a4ul, /*num=*/7ul, /*on=*/7ul);
  syscall(__NR_sysfs, /*option=*/3ul, 0, 0);
  syscall(__NR_ioperm, /*from=*/0ul, /*num=*/0xfffcul, /*on=*/0x8005ul);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul);
  syscall(__NR_keyctl, /*code=*/2ul, /*key=*/0, /*payload=*/0ul, /*paylen=*/0ul,
          0);
  syscall(__NR_ioctl, /*fd=*/-1, /*cmd=*/0x8933, /*arg=*/0ul);
  res = syscall(__NR_creat, /*file=*/0ul, /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_close, /*fd=*/r[0]);
  res = -1;
  NONFAILING(res = syz_open_dev(/*dev=*/0, /*id=*/1, /*flags=*/0));
  if (res != -1)
    r[1] = res;
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0xc04064a0, /*arg=*/0ul);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc06864ce, /*arg=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x400000ffd000ul, /*len=*/0x3000ul, /*prot=*/1ul,
          /*flags=*/0x11ul, /*fd=*/r[0], /*offset=*/0x100000000ul);
  syscall(__NR_bind, /*fd=*/-1, /*addr=*/0ul, /*addrlen=*/0ul);
  res = -1;
  NONFAILING(res = syz_open_dev(/*dev=*/0, /*id=*/2, /*flags=*/0));
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint32_t*)0x400000000484 = 3);
  NONFAILING(*(uint32_t*)0x400000000488 = 2);
  NONFAILING(*(uint32_t*)0x40000000048c = 0);
  NONFAILING(*(uint32_t*)0x400000000490 = 0x100000);
  NONFAILING(*(uint32_t*)0x400000000498 = -1);
  NONFAILING(memset((void*)0x40000000049c, 0, 12));
  res = -1;
  NONFAILING(res = syz_io_uring_setup(
                 /*entries=*/0xce, /*params=*/0x400000000480,
                 /*ring_ptr=*/0x400000000340, /*sqes_ptr=*/0x400000000080));
  if (res != -1) {
    r[3] = res;
    NONFAILING(r[4] = *(uint64_t*)0x400000000340);
    NONFAILING(r[5] = *(uint64_t*)0x400000000080);
  }
  NONFAILING(*(uint32_t*)0x400000000180 = 0xfffffffc);
  NONFAILING(syz_memcpy_off(/*ring_ptr=*/r[4], /*off=*/4,
                            /*src=*/0x400000000180, /*src_off=*/0,
                            /*nbytes=*/4));
  NONFAILING(*(uint8_t*)0x400000000240 = 0x16);
  NONFAILING(*(uint8_t*)0x400000000241 = 4);
  NONFAILING(*(uint16_t*)0x400000000242 = 0);
  NONFAILING(*(uint32_t*)0x400000000244 = 3);
  NONFAILING(*(uint64_t*)0x400000000248 = 0);
  NONFAILING(*(uint64_t*)0x400000000250 = 0);
  NONFAILING(*(uint32_t*)0x400000000258 = 0);
  NONFAILING(*(uint32_t*)0x40000000025c = 0);
  NONFAILING(*(uint64_t*)0x400000000260 = 1);
  NONFAILING(*(uint16_t*)0x400000000268 = 0);
  NONFAILING(*(uint16_t*)0x40000000026a = 0);
  NONFAILING(memset((void*)0x40000000026c, 0, 20));
  NONFAILING(syz_io_uring_submit(/*ring_ptr=*/r[4], /*sqes_ptr=*/r[5],
                                 /*sqe=*/0x400000000240));
  syscall(__NR_io_uring_enter, /*fd=*/r[3], /*to_submit=*/0x43b3,
          /*min_complete=*/0xfffffffd, /*flags=*/0ul, /*sigmask=*/0ul,
          /*size=*/0ul);
  syscall(__NR_readv, /*fd=*/r[2], /*vec=*/0ul, /*vlen=*/0ul);
  syscall(__NR_sendmsg, /*fd=*/-1, /*msg=*/0ul,
          /*f=MSG_ZEROCOPY|MSG_EOR*/ 0x4000080ul);
  syscall(
      __NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0ul,
      /*flags=O_TRUNC|O_NOCTTY|O_LARGEFILE|O_EXCL|O_DIRECT|0x82003*/ 0x8e383,
      /*mode=*/0);
  syscall(__NR_lstat, /*file=*/0ul, /*statbuf=*/0x400000000500ul);
  syscall(__NR_socket, /*domain=*/2ul, /*type=*/2ul, /*proto=*/0);
  NONFAILING(memcpy((void*)0x4000000009c0, "./file0\000", 8));
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x4000000009c0ul, /*type=*/0ul,
          /*flags=MS_SLAVE|MS_DIRSYNC*/ 0x80080ul, /*opts=*/0x400000007f40ul);
  NONFAILING(memcpy((void*)0x4000000001c0, "keyring\000", 8));
  NONFAILING(memcpy((void*)0x400000000200, "syz", 3));
  NONFAILING(*(uint8_t*)0x400000000203 = 0x22 + procid * 4);
  NONFAILING(*(uint8_t*)0x400000000204 = 0);
  res = syscall(__NR_add_key, /*type=*/0x4000000001c0ul,
                /*desc=*/0x400000000200ul, /*payload=*/0ul, /*paylen=*/0ul,
                /*keyring=*/0xfffffffb);
  if (res != -1)
    r[6] = res;
  NONFAILING(memcpy((void*)0x400000000000, "keyring\000", 8));
  NONFAILING(memcpy((void*)0x400000000080, "syz", 3));
  NONFAILING(*(uint8_t*)0x400000000083 = 0x23 + procid * 4);
  NONFAILING(*(uint8_t*)0x400000000084 = 0);
  syscall(__NR_add_key, /*type=*/0x400000000000ul, /*desc=*/0x400000000080ul,
          /*payload=*/0ul, /*paylen=*/0ul, /*keyring=*/r[6]);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x3ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x400000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x400001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}