#define _GNU_SOURCE

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

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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 kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$i915 arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 64 72 69 2f 62 79 2d 70 61 74 68 2f 70 63 69
  //      2d 30 30 30 30 3a 30 30 3a 30 34 2e 30 2d 72 65 6e 64 65 72 00}
  //      (length 0x29)
  //    }
  //    flags: open_flags = 0x80440 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_i915
  memcpy((void*)0x200000000000, "/dev/dri/by-path/pci-0000:00:04.0-render\000",
         41);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000000ul,
                /*flags=O_CREAT|O_CLOEXEC|O_APPEND*/ 0x80440, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  ioctl$DRM_IOCTL_I915_GEM_CREATE arguments: [
  //    fd: fd_i915 (resource)
  //    cmd: const = 0xc010645b (4 bytes)
  //    arg: ptr[inout, drm_i915_gem_create] {
  //      drm_i915_gem_create {
  //        size: int64 = 0x1 (8 bytes)
  //        handle: int32 = 0xac6 (4 bytes)
  //        pad: const = 0x0 (4 bytes)
  //      }
  //    }
  //  ]
  *(uint64_t*)0x200000000040 = 1;
  *(uint32_t*)0x200000000048 = 0xac6;
  *(uint32_t*)0x20000000004c = 0;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc010645b,
          /*arg=*/0x200000000040ul);
  //  ioctl$DRM_IOCTL_I915_GEM_EXECBUFFER2 arguments: [
  //    fd: fd_i915 (resource)
  //    cmd: const = 0x40406469 (4 bytes)
  //    arg: ptr[in, drm_i915_gem_execbuffer2] {
  //      drm_i915_gem_execbuffer2 {
  //        buffers_ptr: ptr[in, array[drm_i915_gem_exec_object2]] {
  //          array[drm_i915_gem_exec_object2] {
  //            drm_i915_gem_exec_object2 {
  //              handle: int32 = 0x1 (4 bytes)
  //              relocation_count: len = 0x0 (4 bytes)
  //              relocs_ptr: nil
  //              alignment: int64 = 0x2 (8 bytes)
  //              offset: int64 = 0x2 (8 bytes)
  //              flags: int64 = 0x40 (8 bytes)
  //              rsvd1: int64 = 0x2 (8 bytes)
  //              rsvd2: int64 = 0x8000000058b (8 bytes)
  //            }
  //            drm_i915_gem_exec_object2 {
  //              handle: int32 = 0x0 (4 bytes)
  //              relocation_count: len = 0x0 (4 bytes)
  //              relocs_ptr: nil
  //              alignment: int64 = 0x5 (8 bytes)
  //              offset: int64 = 0x749f (8 bytes)
  //              flags: int64 = 0x0 (8 bytes)
  //              rsvd1: int64 = 0x0 (8 bytes)
  //              rsvd2: int64 = 0xfc7 (8 bytes)
  //            }
  //          }
  //        }
  //        buffer_count: len = 0x2 (4 bytes)
  //        batch_start_offset: int32 = 0x1000 (4 bytes)
  //        batch_len: int32 = 0x8 (4 bytes)
  //        DR1: int32 = 0x0 (4 bytes)
  //        DR4: int32 = 0x0 (4 bytes)
  //        num_cliprects: len = 0x0 (4 bytes)
  //        cliprects_ptr: nil
  //        flags: i915_execbuf2_flags = 0x40000 (8 bytes)
  //        rsvd1: int64 = 0xffe0000000000000 (8 bytes)
  //        rsvd2: int64 = 0x6f0 (8 bytes)
  //      }
  //    }
  //  ]
  *(uint64_t*)0x200000000080 = 0x200000000140;
  *(uint32_t*)0x200000000140 = 1;
  *(uint32_t*)0x200000000144 = 0;
  *(uint64_t*)0x200000000148 = 0;
  *(uint64_t*)0x200000000150 = 2;
  *(uint64_t*)0x200000000158 = 2;
  *(uint64_t*)0x200000000160 = 0x40;
  *(uint64_t*)0x200000000168 = 2;
  *(uint64_t*)0x200000000170 = 0x8000000058b;
  *(uint32_t*)0x200000000178 = 0;
  *(uint32_t*)0x20000000017c = 0;
  *(uint64_t*)0x200000000180 = 0;
  *(uint64_t*)0x200000000188 = 5;
  *(uint64_t*)0x200000000190 = 0x749f;
  *(uint64_t*)0x200000000198 = 0;
  *(uint64_t*)0x2000000001a0 = 0;
  *(uint64_t*)0x2000000001a8 = 0xfc7;
  *(uint32_t*)0x200000000088 = 2;
  *(uint32_t*)0x20000000008c = 0x1000;
  *(uint32_t*)0x200000000090 = 8;
  *(uint32_t*)0x200000000094 = 0;
  *(uint32_t*)0x200000000098 = 0;
  *(uint32_t*)0x20000000009c = 0;
  *(uint64_t*)0x2000000000a0 = 0;
  *(uint64_t*)0x2000000000a8 = 0x40000;
  *(uint64_t*)0x2000000000b0 = 0xffe0000000000000;
  *(uint64_t*)0x2000000000b8 = 0x6f0;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40406469,
          /*arg=*/0x200000000080ul);
}
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;
  loop();
  return 0;
}