// https://syzkaller.appspot.com/bug?id=467190ea2919f005b2faaad13ea0baabbf4064cc
// 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>

#ifndef __NR_ioctl
#define __NR_ioctl 29
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mprotect
#define __NR_mprotect 226
#endif
#ifndef __NR_userfaultfd
#define __NR_userfaultfd 282
#endif

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[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000,
          /*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=*/0x21000000ul, /*len=*/0x1000, /*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)) {
  }
  //  mmap$IORING_OFF_SQ_RING arguments: [
  //    addr: const = 0x0 (8 bytes)
  //    len: int32 = 0xc (4 bytes)
  //    prot: mmap_prot = 0x2000002 (8 bytes)
  //    flags: mmap_flags = 0x401d031 (8 bytes)
  //    fd: fd_io_uring (resource)
  //    offset: const = 0x0 (8 bytes)
  //  ]
  //  returns ring_ptr
  syscall(
      __NR_mmap, /*addr=*/0ul, /*len=*/0xc,
      /*prot=PROT_GROWSUP|PROT_WRITE*/ 0x2000002ul,
      /*flags=MAP_UNINITIALIZED|MAP_POPULATE|MAP_NORESERVE|MAP_NONBLOCK|MAP_FIXED|0x1021*/
      0x401d031ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  //  userfaultfd arguments: [
  //    flags: userfaultfd_flags = 0x80001 (8 bytes)
  //  ]
  //  returns fd_uffd
  res = syscall(__NR_userfaultfd,
                /*flags=UFFD_USER_MODE_ONLY|O_CLOEXEC*/ 0x80001ul);
  if (res != -1)
    r[0] = res;
  //  ioctl$UFFDIO_API arguments: [
  //    fd: fd_uffd (resource)
  //    cmd: const = 0xc018aa3f (4 bytes)
  //    arg: ptr[in, uffdio_api] {
  //      uffdio_api {
  //        api: const = 0xaa (8 bytes)
  //        featur: uffdio_features = 0x27c (8 bytes)
  //        ioctls: const = 0x0 (8 bytes)
  //      }
  //    }
  //  ]
  NONFAILING(*(uint64_t*)0x200000c0 = 0xaa);
  NONFAILING(*(uint64_t*)0x200000c8 = 0x27c);
  NONFAILING(*(uint64_t*)0x200000d0 = 0);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc018aa3f, /*arg=*/0x200000c0ul);
  //  ioctl$sock_inet6_SIOCSIFDSTADDR arguments: [
  //    fd: sock_in6 (resource)
  //    cmd: const = 0x8918 (4 bytes)
  //    arg: ptr[in, in6_ifreq] {
  //      in6_ifreq {
  //        ifr6_addr: union ipv6_addr {
  //          ipv4: ipv6_addr_ipv4 {
  //            a0: buffer: {00 00 00 00 00 00 00 00 00 00} (length 0xa)
  //            a1: buffer: {ff ff} (length 0x2)
  //            a3: union ipv4_addr {
  //              empty: const = 0x0 (4 bytes)
  //            }
  //          }
  //        }
  //        ifr6_prefixlen: int32 = 0x1 (4 bytes)
  //        ifr6_ifindex: ifindex (resource)
  //      }
  //    }
  //  ]
  NONFAILING(memset((void*)0x20000080, 0, 10));
  NONFAILING(memset((void*)0x2000008a, 255, 2));
  NONFAILING(*(uint32_t*)0x2000008c = htobe32(0));
  NONFAILING(*(uint32_t*)0x20000090 = 1);
  NONFAILING(*(uint32_t*)0x20000094 = 0);
  syscall(__NR_ioctl, /*fd=*/(intptr_t)-1, /*cmd=*/0x8918,
          /*arg=*/0x20000080ul);
  //  mprotect arguments: [
  //    addr: VMA[0xf000]
  //    len: len = 0xf000 (8 bytes)
  //    prot: mmap_prot = 0x1 (8 bytes)
  //  ]
  syscall(__NR_mprotect, /*addr=*/0x20000000ul, /*len=*/0xf000ul,
          /*prot=PROT_READ*/ 1ul);
  //  ioctl$UFFDIO_REGISTER arguments: [
  //    fd: fd_uffd (resource)
  //    cmd: const = 0xc020aa00 (4 bytes)
  //    arg: ptr[in, uffdio_register] {
  //      uffdio_register {
  //        range: uffdio_range {
  //          start: VMA[0xc00000]
  //          len: len = 0xc00000 (8 bytes)
  //        }
  //        mode: uffdio_register_mode = 0x1 (8 bytes)
  //        ioctls: const = 0x0 (8 bytes)
  //      }
  //    }
  //  ]
  NONFAILING(*(uint64_t*)0x20000080 = 0x200e2000);
  NONFAILING(*(uint64_t*)0x20000088 = 0xc00000);
  NONFAILING(*(uint64_t*)0x20000090 = 1);
  NONFAILING(*(uint64_t*)0x20000098 = 0);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc020aa00, /*arg=*/0x20000080ul);
  return 0;
}