// https://syzkaller.appspot.com/bug?id=7b1188e36d188e8dccdbcc72e0600e00d585cfa3
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

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 void setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

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);
  setup_sysctl();
  const char* reason;
  (void)reason;
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$pppl2tp arguments: [
  //    domain: const = 0x18 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x1 (4 bytes)
  //  ]
  //  returns sock_pppl2tp
  res = syscall(__NR_socket, /*domain=*/0x18ul, /*type=*/1ul, /*proto=*/1);
  if (res != -1)
    r[0] = res;
  //  socket$inet6_udp arguments: [
  //    domain: const = 0xa (8 bytes)
  //    type: const = 0x2 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_udp6
  res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/2ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  //  connect$pppl2tp arguments: [
  //    fd: sock_pppl2tp (resource)
  //    addr: ptr[in, sockaddr_pppl2tp] {
  //      union sockaddr_pppl2tp {
  //        pppol2tpv3: sockaddr_pppl2tp_t[pppol2tpv3_addr] {
  //          sa_family: const = 0x18 (2 bytes)
  //          sa_protocol: const = 0x1 (4 bytes)
  //          addr: pppol2tp_addr_t[int32] {
  //            pid: const = 0x3 (4 bytes)
  //            fd: sock (resource)
  //            addr: sockaddr_in {
  //              family: const = 0x2 (2 bytes)
  //              port: int16be = 0x0 (2 bytes)
  //              addr: union ipv4_addr {
  //                dev: ipv4_addr_t[netdev_addr_id] {
  //                  a0: const = 0xac (1 bytes)
  //                  a1: const = 0x14 (1 bytes)
  //                  a2: const = 0x14 (1 bytes)
  //                  a3: int8 = 0x0 (1 bytes)
  //                }
  //              }
  //              pad = 0x0 (8 bytes)
  //            }
  //            s_tunnel: int32 = 0x2 (4 bytes)
  //            s_session: int32 = 0x0 (4 bytes)
  //            d_tunnel: int32 = 0x0 (4 bytes)
  //            d_session: int32 = 0x0 (4 bytes)
  //          }
  //        }
  //      }
  //    }
  //    addrlen: len = 0x2e (8 bytes)
  //  ]
  *(uint16_t*)0x200000000000 = 0x18;
  *(uint32_t*)0x200000000002 = 1;
  *(uint32_t*)0x200000000006 = 3;
  *(uint32_t*)0x20000000000a = r[1];
  *(uint16_t*)0x20000000000e = 2;
  *(uint16_t*)0x200000000010 = htobe16(0);
  *(uint8_t*)0x200000000012 = 0xac;
  *(uint8_t*)0x200000000013 = 0x14;
  *(uint8_t*)0x200000000014 = 0x14;
  *(uint8_t*)0x200000000015 = 0;
  *(uint32_t*)0x20000000001e = 2;
  *(uint32_t*)0x200000000022 = 0;
  *(uint32_t*)0x200000000026 = 0;
  *(uint32_t*)0x20000000002a = 0;
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000000ul,
          /*addrlen=*/0x2eul);
  //  close arguments: [
  //    fd: fd (resource)
  //  ]
  syscall(__NR_close, /*fd=*/r[0]);
  //  socket$pppl2tp arguments: [
  //    domain: const = 0x18 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x1 (4 bytes)
  //  ]
  //  returns sock_pppl2tp
  res = syscall(__NR_socket, /*domain=*/0x18ul, /*type=*/1ul, /*proto=*/1);
  if (res != -1)
    r[2] = res;
  //  connect$pppl2tp arguments: [
  //    fd: sock_pppl2tp (resource)
  //    addr: ptr[in, sockaddr_pppl2tp] {
  //      union sockaddr_pppl2tp {
  //        pppol2tpv3in6: sockaddr_pppl2tp_t[pppol2tpv3in6_addr] {
  //          sa_family: const = 0x18 (2 bytes)
  //          sa_protocol: const = 0x1 (4 bytes)
  //          addr: pppol2tpin6_addr_t[int32] {
  //            pid: const = 0x0 (4 bytes)
  //            fd: sock (resource)
  //            s_tunnel: int32 = 0x2 (4 bytes)
  //            s_session: int32 = 0x0 (4 bytes)
  //            d_tunnel: int32 = 0x2 (4 bytes)
  //            d_session: int32 = 0x1 (4 bytes)
  //            addr: sockaddr_in6 {
  //              family: const = 0xa (2 bytes)
  //              port: int16be = 0x4e24 (2 bytes)
  //              flow: int32be = 0x4 (4 bytes)
  //              addr: union ipv6_addr {
  //                empty: ipv6_addr_empty {
  //                  a0: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                  00} (length 0x10)
  //                }
  //              }
  //              scope: int32 = 0x1f (4 bytes)
  //            }
  //          }
  //        }
  //      }
  //    }
  //    addrlen: len = 0x3a (8 bytes)
  //  ]
  *(uint16_t*)0x200000000040 = 0x18;
  *(uint32_t*)0x200000000042 = 1;
  *(uint32_t*)0x200000000046 = 0;
  *(uint32_t*)0x20000000004a = r[1];
  *(uint32_t*)0x20000000004e = 2;
  *(uint32_t*)0x200000000052 = 0;
  *(uint32_t*)0x200000000056 = 2;
  *(uint32_t*)0x20000000005a = 1;
  *(uint16_t*)0x20000000005e = 0xa;
  *(uint16_t*)0x200000000060 = htobe16(0x4e24);
  *(uint32_t*)0x200000000062 = htobe32(4);
  memset((void*)0x200000000066, 0, 16);
  *(uint32_t*)0x200000000076 = 0x1f;
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000040ul,
          /*addrlen=*/0x3aul);
  //  ioctl$PPPIOCGL2TPSTATS arguments: [
  //    fd: sock_pppl2tp (resource)
  //    cmd: const = 0x40047452 (4 bytes)
  //    arg: nil
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x40047452, /*arg=*/0ul);
  return 0;
}