// https://syzkaller.appspot.com/bug?id=4c61fb1940112618e517095b4c82ffc54c81b806
// 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>

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 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)
    ;
}

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();
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  mq_open arguments: [
  //    name: ptr[in, buffer] {
  //      buffer: {65 74 68 30 00 dd ad 34 3d 32 6b f1 05 9b 91 79 e1 3b 46 a2
  //      8d 66 e9 04 00 00 00 00 00 37 38 7a 3d 8f d5 46 a4 41 52 c7 9f 2e dc
  //      db 22 41 16 d8 19 f1 6c 5a c8 93 da f2 c9 e8 68 5b 75 38 c6 fa 9e 70
  //      be 07 e2 f5 a3 59 9f e1 04 67 4d 99 4b 24 0d f1 47 ee e1 bd 1e df e1
  //      9c 19 da d3 94 45 4c ca 88 85 51 02 d9 4c 90 eb 25 2f b1 eb 11 75 50
  //      37 1f d9 62 eb 46 f8 88 f0 ac 2e 94 fc 0b b1 57 ef 7e 2b 6e b1 9b 02
  //      6e 5d 78 72 b3 80 bc 3e e8 58 58 e6 12 f3 c9 d5 f8 d1 8d cb 39 bf b0
  //      28 3c eb 92 8a 16 b7 11 5e b6 b7 6e d5 b5 00 5b df 94 00 0d 95 17 a1
  //      68 f8 00 00 00 22 a0 05 cc 5e 90 63 c9 7d b8 0a 79 f4 e1 b4 2e a4 07
  //      05 bb 7d 91 f4 43 f5 4f f1 61 12 08 86 a1 36 bb 7d 43 c9 1d 5c ed 44
  //      14 b1 77 1e a0 c1 45 b5 f8 ab fb d9 93 b8 76 4a 85 70 b5 6e 1b e4 d5
  //      67 ae e4 eb ca ae 1b 73 d4 f0 c0 da 67 19 52 34 d4 d4 04 fc 04 5a 62
  //      f6 ba f8 42 f6 59 55 cd f2 db b5 a2 da df 8d 44 ef 60 13 15 24 ce 71
  //      d7 6a d7 e3 56 f2 a2 95 cf 18 54 f1 b0 f3 f8 4f} (length 0x138)
  //    }
  //    flags: mq_open_flags = 0x1 (8 bytes)
  //    mode: open_mode = 0x136 (8 bytes)
  //    attr: nil
  //  ]
  //  returns fd_mq
  NONFAILING(memcpy(
      (void*)0x200000000780,
      "eth0\000\335\2554=2k\361\005\233\221y\341;"
      "F\242\215f\351\004\000\000\000\000\00078z=\217\325F\244AR\307\237."
      "\334\333\"A\026\330\031\361lZ\310\223\332\362\311\350h["
      "u8\306\372\236p\276\a\342\365\243Y\237\341\004gM\231K$"
      "\r\361G\356\341\275\036\337\341\234\031\332\323\224EL\312\210\205Q\002"
      "\331L\220\353%/"
      "\261\353\021uP7\037\331b\353F\370\210\360\254.\224\374\v\261W\357~+"
      "n\261\233\002n]xr\263\200\274>"
      "\350XX\346\022\363\311\325\370\321\215\3139\277\260(<"
      "\353\222\212\026\267\021^\266\267n\325\265\000["
      "\337\224\000\r\225\027\241h\370\000\000\000\"\240\005\314^\220c\311}"
      "\270\ny\364\341\264.\244\a\005\273}"
      "\221\364C\365O\361a\022\b\206\2416\273}"
      "C\311\035\\\355D\024\261w\036\240\301E\265\370\253\373\331\223\270vJ\205"
      "p\265n\033\344\325g\256\344\353\312\256\033s\324\360\300\332g\031R4\324"
      "\324\004\374\004Zb\366\272\370B\366YU\315\362\333\265\242\332\337\215D"
      "\357`\023\025$\316q\327j\327\343V\362\242\225\317\030T\361\260\363\370O",
      312));
  syscall(__NR_mq_open, /*name=*/0x200000000780ul, /*flags=O_WRONLY*/ 1ul,
          /*mode=S_IWOTH|S_IROTH|S_IWGRP|S_IRGRP|S_IRUSR*/ 0x136ul,
          /*attr=*/0ul);
  return 0;
}