// https://syzkaller.appspot.com/bug?id=524be83fa28f8e505866554a99eebc187fda36bc
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

#ifndef __NR_bpf
#define __NR_bpf 321
#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;                                                                        \
  })

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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[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);
  setup_sysctl();
  const char* reason;
  (void)reason;
  install_segv_handler();
  use_temporary_dir();
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  NONFAILING(*(uint32_t*)0x2000000002c0 = 0x1b);
  NONFAILING(*(uint32_t*)0x2000000002c4 = 0);
  NONFAILING(*(uint32_t*)0x2000000002c8 = 0);
  NONFAILING(*(uint32_t*)0x2000000002cc = 0x8000);
  NONFAILING(*(uint32_t*)0x2000000002d0 = 0);
  NONFAILING(*(uint32_t*)0x2000000002d4 = -1);
  NONFAILING(*(uint32_t*)0x2000000002d8 = 0);
  NONFAILING(memset((void*)0x2000000002dc, 0, 16));
  NONFAILING(*(uint32_t*)0x2000000002ec = 0);
  NONFAILING(*(uint32_t*)0x2000000002f0 = -1);
  NONFAILING(*(uint32_t*)0x2000000002f4 = 0);
  NONFAILING(*(uint32_t*)0x2000000002f8 = 0);
  NONFAILING(*(uint32_t*)0x2000000002fc = 0);
  NONFAILING(*(uint64_t*)0x200000000300 = 0);
  NONFAILING(*(uint32_t*)0x200000000308 = 0);
  NONFAILING(*(uint32_t*)0x20000000030c = 0);
  res =
      syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x2000000002c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x200000000380 = 0x1f);
  NONFAILING(*(uint32_t*)0x200000000384 = 0xd);
  NONFAILING(*(uint64_t*)0x200000000388 = 0x200000000100);
  NONFAILING(*(uint8_t*)0x200000000100 = 0x18);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000101, 0, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000101, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x200000000102 = 0);
  NONFAILING(*(uint32_t*)0x200000000104 = 0xfffffffc);
  NONFAILING(*(uint8_t*)0x200000000108 = 0);
  NONFAILING(*(uint8_t*)0x200000000109 = 0);
  NONFAILING(*(uint16_t*)0x20000000010a = 0);
  NONFAILING(*(uint32_t*)0x20000000010c = 7);
  NONFAILING(*(uint8_t*)0x200000000110 = 0x85);
  NONFAILING(*(uint8_t*)0x200000000111 = 0);
  NONFAILING(*(uint16_t*)0x200000000112 = 0);
  NONFAILING(*(uint32_t*)0x200000000114 = 0x11);
  NONFAILING(*(uint8_t*)0x200000000118 = 0x18);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000119, 1, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000119, 1, 4, 4));
  NONFAILING(*(uint16_t*)0x20000000011a = 0);
  NONFAILING(*(uint32_t*)0x20000000011c = r[0]);
  NONFAILING(*(uint8_t*)0x200000000120 = 0);
  NONFAILING(*(uint8_t*)0x200000000121 = 0);
  NONFAILING(*(uint16_t*)0x200000000122 = 0);
  NONFAILING(*(uint32_t*)0x200000000124 = 0);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000128, 7, 0, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000128, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000128, 0xb, 4, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000129, 8, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000129, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x20000000012a = 0);
  NONFAILING(*(uint32_t*)0x20000000012c = 0x20000002);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000130, 3, 0, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000130, 3, 3, 2));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000130, 3, 5, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000131, 0xa, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000131, 8, 4, 4));
  NONFAILING(*(uint16_t*)0x200000000132 = 0xfff8);
  NONFAILING(*(uint32_t*)0x200000000134 = 0);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000138, 7, 0, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000138, 1, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000138, 0xb, 4, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000139, 2, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000139, 0xa, 4, 4));
  NONFAILING(*(uint16_t*)0x20000000013a = 0);
  NONFAILING(*(uint32_t*)0x20000000013c = 0);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000140, 7, 0, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000140, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000140, 0, 4, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000141, 2, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000141, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x200000000142 = 0);
  NONFAILING(*(uint32_t*)0x200000000144 = 0xfffffff8);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000148, 7, 0, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000148, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000148, 0xb, 4, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000149, 3, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000149, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x20000000014a = 0);
  NONFAILING(*(uint32_t*)0x20000000014c = 8);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000150, 7, 0, 3));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000150, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000150, 0xb, 4, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000151, 4, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x200000000151, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x200000000152 = 0);
  NONFAILING(*(uint32_t*)0x200000000154 = 1);
  NONFAILING(*(uint8_t*)0x200000000158 = 0x85);
  NONFAILING(*(uint8_t*)0x200000000159 = 0);
  NONFAILING(*(uint16_t*)0x20000000015a = 0);
  NONFAILING(*(uint32_t*)0x20000000015c = 0xa6);
  NONFAILING(*(uint8_t*)0x200000000160 = 0x95);
  NONFAILING(*(uint8_t*)0x200000000161 = 0);
  NONFAILING(*(uint16_t*)0x200000000162 = 0);
  NONFAILING(*(uint32_t*)0x200000000164 = 0);
  NONFAILING(*(uint64_t*)0x200000000390 = 0x2000000000c0);
  NONFAILING(memcpy((void*)0x2000000000c0, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x200000000398 = 0);
  NONFAILING(*(uint32_t*)0x20000000039c = 0);
  NONFAILING(*(uint64_t*)0x2000000003a0 = 0);
  NONFAILING(*(uint32_t*)0x2000000003a8 = 0);
  NONFAILING(*(uint32_t*)0x2000000003ac = 0x34);
  NONFAILING(memset((void*)0x2000000003b0, 0, 16));
  NONFAILING(*(uint32_t*)0x2000000003c0 = 0);
  NONFAILING(*(uint32_t*)0x2000000003c4 = 0);
  NONFAILING(*(uint32_t*)0x2000000003c8 = -1);
  NONFAILING(*(uint32_t*)0x2000000003cc = 8);
  NONFAILING(*(uint64_t*)0x2000000003d0 = 0);
  NONFAILING(*(uint32_t*)0x2000000003d8 = 0);
  NONFAILING(*(uint32_t*)0x2000000003dc = 0x10);
  NONFAILING(*(uint64_t*)0x2000000003e0 = 0);
  NONFAILING(*(uint32_t*)0x2000000003e8 = 0);
  NONFAILING(*(uint32_t*)0x2000000003ec = 0);
  NONFAILING(*(uint32_t*)0x2000000003f0 = 0);
  NONFAILING(*(uint32_t*)0x2000000003f4 = 0);
  NONFAILING(*(uint64_t*)0x2000000003f8 = 0);
  NONFAILING(*(uint64_t*)0x200000000400 = 0);
  NONFAILING(*(uint32_t*)0x200000000408 = 0x10);
  NONFAILING(*(uint32_t*)0x20000000040c = 0xfff);
  NONFAILING(*(uint32_t*)0x200000000410 = 0);
  res =
      syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000380ul, /*size=*/0x94ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint32_t*)0x200000000500 = r[1]);
  NONFAILING(*(uint32_t*)0x200000000504 = 0);
  NONFAILING(*(uint32_t*)0x200000000508 = 0);
  NONFAILING(*(uint32_t*)0x20000000050c = 0);
  NONFAILING(*(uint64_t*)0x200000000510 = 0);
  NONFAILING(*(uint64_t*)0x200000000518 = 0);
  NONFAILING(*(uint32_t*)0x200000000520 = 0);
  NONFAILING(*(uint32_t*)0x200000000524 = 0);
  NONFAILING(*(uint32_t*)0x200000000528 = 0);
  NONFAILING(*(uint32_t*)0x20000000052c = 0);
  NONFAILING(*(uint64_t*)0x200000000530 = 0);
  NONFAILING(*(uint64_t*)0x200000000538 = 0);
  NONFAILING(*(uint32_t*)0x200000000540 = 0);
  NONFAILING(*(uint32_t*)0x200000000544 = 0);
  NONFAILING(*(uint32_t*)0x200000000548 = 0);
  syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x200000000500ul, /*size=*/0x48ul);
  return 0;
}