// 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[2] = {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$pppl2tp arguments: [
  //    fd: sock_pppl2tp (resource)
  //    addr: ptr[in, sockaddr_pppl2tp] {
  //      union sockaddr_pppl2tp {
  //        pppol2tp: sockaddr_pppl2tp_t[pppol2tp_addr] {
  //          sa_family: const = 0x18 (2 bytes)
  //          sa_protocol: const = 0x1 (4 bytes)
  //          addr: pppol2tp_addr_t[int16] {
  //            pid: const = 0x0 (4 bytes)
  //            fd: sock (resource)
  //            addr: sockaddr_in {
  //              family: const = 0x2 (2 bytes)
  //              port: int16be = 0x4e24 (2 bytes)
  //              addr: union ipv4_addr {
  //                broadcast: const = 0xffffffff (4 bytes)
  //              }
  //              pad = 0x0 (8 bytes)
  //            }
  //            s_tunnel: int16 = 0x2 (2 bytes)
  //            s_session: int16 = 0x0 (2 bytes)
  //            d_tunnel: int16 = 0x3 (2 bytes)
  //            d_session: int16 = 0x0 (2 bytes)
  //          }
  //        }
  //      }
  //    }
  //    addrlen: len = 0x26 (8 bytes)
  //  ]
  NONFAILING(*(uint16_t*)0x200000000000 = 0x18);
  NONFAILING(*(uint32_t*)0x200000000002 = 1);
  NONFAILING(*(uint32_t*)0x200000000006 = 0);
  NONFAILING(*(uint32_t*)0x20000000000a = r[1]);
  NONFAILING(*(uint16_t*)0x20000000000e = 2);
  NONFAILING(*(uint16_t*)0x200000000010 = htobe16(0x4e24));
  NONFAILING(*(uint32_t*)0x200000000012 = htobe32(-1));
  NONFAILING(*(uint16_t*)0x20000000001e = 2);
  NONFAILING(*(uint16_t*)0x200000000020 = 0);
  NONFAILING(*(uint16_t*)0x200000000022 = 3);
  NONFAILING(*(uint16_t*)0x200000000024 = 0);
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000000ul,
          /*addrlen=*/0x26ul);
  //  ioctl$PPPIOCGL2TPSTATS arguments: [
  //    fd: sock_pppl2tp (resource)
  //    cmd: const = 0x80487436 (4 bytes)
  //    arg: nil
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x80487436, /*arg=*/0ul);
  return 0;
}