// https://syzkaller.appspot.com/bug?id=7eb5be5c14aad4813ccfec72fcbfe3ad54706260
// 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/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_bpf
#define __NR_bpf 280
#endif
#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=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*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=*/0x21000000ul, /*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)) {
  }
  //  bpf$PROG_LOAD arguments: [
  //    cmd: const = 0x5 (8 bytes)
  //    arg: ptr[in, bpf_prog_t[flags[bpf_prog_type, int32],
  //    bpf_prog_attach_types, bpf_btf_id[opt], fd_bpf_prog[opt]]] {
  //      bpf_prog_t[flags[bpf_prog_type, int32], bpf_prog_attach_types,
  //      bpf_btf_id[opt], fd_bpf_prog[opt]] {
  //        type: bpf_prog_type = 0x4 (4 bytes)
  //        ninsn: bytesize8 = 0x0 (4 bytes)
  //        insns: nil
  //        license: nil
  //        loglev: int32 = 0x0 (4 bytes)
  //        logsize: len = 0x0 (4 bytes)
  //        log: nil
  //        kern_version: bpf_kern_version = 0x41000 (4 bytes)
  //        flags: bpf_prog_load_flags = 0x40 (4 bytes)
  //        prog_name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00}
  //        (length 0x10) prog_ifindex: ifindex (resource) expected_attach_type:
  //        union bpf_prog_attach_types {
  //          fallback: bpf_attach_types = 0x5 (4 bytes)
  //        }
  //        btf_fd: fd_btf (resource)
  //        func_info_rec_size: const = 0x8 (4 bytes)
  //        func_info: nil
  //        func_info_cnt: len = 0x0 (4 bytes)
  //        line_info_rec_size: const = 0x10 (4 bytes)
  //        line_info: ptr[in, bpf_line_info] {
  //          bpf_line_info {
  //            insn_off: int32 = 0x0 (4 bytes)
  //            file_name_off: int32 = 0xa (4 bytes)
  //            line_off: int32 = 0x0 (4 bytes)
  //            line_col: int32 = 0x10 (4 bytes)
  //          }
  //        }
  //        line_info_cnt: len = 0x10 (4 bytes)
  //        attach_btf_id: bpf_btf_id (resource)
  //        attach_prog_fd: fd_bpf_prog (resource)
  //        core_relo_cnt: len = 0x0 (4 bytes)
  //        fd_array: nil
  //        core_relos: nil
  //        core_relo_rec_size: const = 0x10 (4 bytes)
  //        log_true_size: int32 = 0x0 (4 bytes)
  //        prog_token_fd: union _bpf_prog_t[flags[bpf_prog_type, int32],
  //        bpf_prog_attach_types, bpf_btf_id[opt],
  //        fd_bpf_prog[opt]]_prog_token_fd_wrapper {
  //          void: buffer: {} (length 0x0)
  //        }
  //        pad: union _bpf_prog_t[flags[bpf_prog_type, int32],
  //        bpf_prog_attach_types, bpf_btf_id[opt],
  //        fd_bpf_prog[opt]]_pad_wrapper {
  //          value: const = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    size: len = 0x94 (8 bytes)
  //  ]
  //  returns fd_bpf_prog
  NONFAILING(*(uint32_t*)0x200002c0 = 4);
  NONFAILING(*(uint32_t*)0x200002c4 = 0);
  NONFAILING(*(uint64_t*)0x200002c8 = 0);
  NONFAILING(*(uint64_t*)0x200002d0 = 0);
  NONFAILING(*(uint32_t*)0x200002d8 = 0);
  NONFAILING(*(uint32_t*)0x200002dc = 0);
  NONFAILING(*(uint64_t*)0x200002e0 = 0);
  NONFAILING(*(uint32_t*)0x200002e8 = 0x41000);
  NONFAILING(*(uint32_t*)0x200002ec = 0x40);
  NONFAILING(memset((void*)0x200002f0, 0, 16));
  NONFAILING(*(uint32_t*)0x20000300 = 0);
  NONFAILING(*(uint32_t*)0x20000304 = 5);
  NONFAILING(*(uint32_t*)0x20000308 = -1);
  NONFAILING(*(uint32_t*)0x2000030c = 8);
  NONFAILING(*(uint64_t*)0x20000310 = 0);
  NONFAILING(*(uint32_t*)0x20000318 = 0);
  NONFAILING(*(uint32_t*)0x2000031c = 0x10);
  NONFAILING(*(uint64_t*)0x20000320 = 0x20000000);
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0xa);
  NONFAILING(*(uint32_t*)0x20000008 = 0);
  NONFAILING(*(uint32_t*)0x2000000c = 0x10);
  NONFAILING(*(uint32_t*)0x20000328 = 0x10);
  NONFAILING(*(uint32_t*)0x2000032c = 0);
  NONFAILING(*(uint32_t*)0x20000330 = -1);
  NONFAILING(*(uint32_t*)0x20000334 = 0);
  NONFAILING(*(uint64_t*)0x20000338 = 0);
  NONFAILING(*(uint64_t*)0x20000340 = 0);
  NONFAILING(*(uint32_t*)0x20000348 = 0x10);
  NONFAILING(*(uint32_t*)0x2000034c = 0);
  NONFAILING(*(uint32_t*)0x20000350 = 0);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200002c0ul, /*size=*/0x94ul);
  //  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 = 0x0 (8 bytes)
  //        ioctls: const = 0x0 (8 bytes)
  //      }
  //    }
  //  ]
  NONFAILING(*(uint64_t*)0x200000c0 = 0xaa);
  NONFAILING(*(uint64_t*)0x200000c8 = 0);
  NONFAILING(*(uint64_t*)0x200000d0 = 0);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc018aa3f, /*arg=*/0x200000c0ul);
  //  mprotect arguments: [
  //    addr: VMA[0x4000]
  //    len: len = 0x4000 (8 bytes)
  //    prot: mmap_prot = 0x1 (8 bytes)
  //  ]
  syscall(__NR_mprotect, /*addr=*/0x20000000ul, /*len=*/0x4000ul,
          /*prot=PROT_READ*/ 1ul);
  //  ioctl$UFFDIO_ZEROPAGE arguments: [
  //    fd: fd_uffd (resource)
  //    cmd: const = 0xc020aa04 (4 bytes)
  //    arg: ptr[in, uffdio_zeropage] {
  //      uffdio_zeropage {
  //        range: uffdio_range {
  //          start: VMA[0x3000]
  //          len: len = 0x3000 (8 bytes)
  //        }
  //        mode: uffdio_zero_mode = 0x0 (8 bytes)
  //        zeropg: const = 0x0 (8 bytes)
  //      }
  //    }
  //  ]
  NONFAILING(*(uint64_t*)0x20000000 = 0x204bd000);
  NONFAILING(*(uint64_t*)0x20000008 = 0x3000);
  NONFAILING(*(uint64_t*)0x20000010 = 0);
  NONFAILING(*(uint64_t*)0x20000018 = 0);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc020aa04, /*arg=*/0x20000000ul);
  return 0;
}