// https://syzkaller.appspot.com/bug?id=08acfb3ecee71b9442e8275dde26607f2ad7c6a1
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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;                                                                        \
  })

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);
  const char* reason;
  (void)reason;
  install_segv_handler();
  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)
  //  ]
  NONFAILING(*(uint16_t*)0x200000000000 = 0x18);
  NONFAILING(*(uint32_t*)0x200000000002 = 1);
  NONFAILING(*(uint32_t*)0x200000000006 = 3);
  NONFAILING(*(uint32_t*)0x20000000000a = r[1]);
  NONFAILING(*(uint16_t*)0x20000000000e = 2);
  NONFAILING(*(uint16_t*)0x200000000010 = htobe16(0));
  NONFAILING(*(uint8_t*)0x200000000012 = 0xac);
  NONFAILING(*(uint8_t*)0x200000000013 = 0x14);
  NONFAILING(*(uint8_t*)0x200000000014 = 0x14);
  NONFAILING(*(uint8_t*)0x200000000015 = 0);
  NONFAILING(*(uint32_t*)0x20000000001e = 2);
  NONFAILING(*(uint32_t*)0x200000000022 = 0);
  NONFAILING(*(uint32_t*)0x200000000026 = 0);
  NONFAILING(*(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$pppl2tp arguments: [
  //    fd: sock_pppl2tp (resource)
  //    addr: ptr[in, sockaddr_pppl2tp] {
  //      union sockaddr_pppl2tp {
  //        pppol2tpv3in6: sockaddr_pppl2tp_t[pppol2tpv3in6_addr] {
  //          sa_family: const = 0x18 (2 bytes)
  //          sa_protocol: const = 0x1 (4 bytes)
  //          addr: pppol2tpin6_addr_t[int32] {
  //            pid: const = 0x0 (4 bytes)
  //            fd: sock (resource)
  //            s_tunnel: int32 = 0x2 (4 bytes)
  //            s_session: int32 = 0x4000000 (4 bytes)
  //            d_tunnel: int32 = 0x2 (4 bytes)
  //            d_session: int32 = 0x1 (4 bytes)
  //            addr: sockaddr_in6 {
  //              family: const = 0xa (2 bytes)
  //              port: int16be = 0x4e21 (2 bytes)
  //              flow: int32be = 0x4 (4 bytes)
  //              addr: union ipv6_addr {
  //                empty: ipv6_addr_empty {
  //                  a0: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                  00} (length 0x10)
  //                }
  //              }
  //              scope: int32 = 0x1f (4 bytes)
  //            }
  //          }
  //        }
  //      }
  //    }
  //    addrlen: len = 0x3a (8 bytes)
  //  ]
  NONFAILING(*(uint16_t*)0x200000000040 = 0x18);
  NONFAILING(*(uint32_t*)0x200000000042 = 1);
  NONFAILING(*(uint32_t*)0x200000000046 = 0);
  NONFAILING(*(uint32_t*)0x20000000004a = r[1]);
  NONFAILING(*(uint32_t*)0x20000000004e = 2);
  NONFAILING(*(uint32_t*)0x200000000052 = 0x4000000);
  NONFAILING(*(uint32_t*)0x200000000056 = 2);
  NONFAILING(*(uint32_t*)0x20000000005a = 1);
  NONFAILING(*(uint16_t*)0x20000000005e = 0xa);
  NONFAILING(*(uint16_t*)0x200000000060 = htobe16(0x4e21));
  NONFAILING(*(uint32_t*)0x200000000062 = htobe32(4));
  NONFAILING(memset((void*)0x200000000066, 0, 16));
  NONFAILING(*(uint32_t*)0x200000000076 = 0x1f);
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000040ul,
          /*addrlen=*/0x3aul);
  //  ioctl$PPPIOCGMRU arguments: [
  //    fd: sock_pppox (resource)
  //    cmd: const = 0x80047453 (4 bytes)
  //    arg: nil
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x80047453, /*arg=*/0ul);
  return 0;
}