// https://syzkaller.appspot.com/bug?id=b36164c867d96d9ecdb16647e0524e5b0e803f4a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#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>

#ifndef __NR_bpf
#define __NR_bpf 280
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif

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;
}

#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 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 < 15000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  bpf$PROG_LOAD_XDP arguments: [
  //    cmd: const = 0x5 (8 bytes)
  //    arg: ptr[in, bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32], const[BPF_XDP,
  //    int32], const[0, int32], const[0, int32]]] {
  //      bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32], const[BPF_XDP, int32],
  //      const[0, int32], const[0, int32]] {
  //        type: const = 0x12 (4 bytes)
  //        ninsn: bytesize8 = 0x4 (4 bytes)
  //        insns: ptr[in, bpf_instructions] {
  //          union bpf_instructions {
  //            framed: bpf_framed_program {
  //              initr0: bpf_insn_init_r0 {
  //                code: const = 0x18 (1 bytes)
  //                dst: const = 0x0 (0 bytes)
  //                src: const = 0x0 (1 bytes)
  //                off: const = 0x0 (2 bytes)
  //                imm: int32 = 0x0 (4 bytes)
  //                code2: const = 0x0 (1 bytes)
  //                regs2: const = 0x0 (1 bytes)
  //                off2: const = 0x0 (2 bytes)
  //                imm2: int32 = 0x0 (4 bytes)
  //              }
  //              body: array[bpf_insn] {
  //                union bpf_insn {
  //                  ldst: bpf_insn_ldst_t[bpf_ldst_insn, bpf_ldst_size,
  //                  bpf_ldst_mode, flags[bpf_reg, int8:4], flags[bpf_reg,
  //                  int8:4], flags[bpf_insn_offsets, int16],
  //                  flags[bpf_insn_immediates, int32]] {
  //                    code_class: bpf_ldst_insn = 0x1 (0 bytes)
  //                    code_size: bpf_ldst_size = 0x0 (0 bytes)
  //                    code_mode: bpf_ldst_mode = 0x3 (1 bytes)
  //                    dst: bpf_reg = 0x2 (0 bytes)
  //                    src: bpf_reg = 0x1 (1 bytes)
  //                    off: bpf_insn_offsets = 0x3c (2 bytes)
  //                    imm: bpf_insn_immediates = 0x0 (4 bytes)
  //                  }
  //                }
  //              }
  //              exit: bpf_insn_exit {
  //                code: const = 0x95 (1 bytes)
  //                regs: const = 0x0 (1 bytes)
  //                off: const = 0x0 (2 bytes)
  //                imm: const = 0x0 (4 bytes)
  //              }
  //            }
  //          }
  //        }
  //        license: ptr[in, buffer] {
  //          buffer: {47 50 4c 00} (length 0x4)
  //        }
  //        loglev: int32 = 0x0 (4 bytes)
  //        logsize: len = 0x0 (4 bytes)
  //        log: nil
  //        kern_version: bpf_kern_version = 0x0 (4 bytes)
  //        flags: bpf_prog_load_flags = 0x0 (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:
  //        const = 0xf (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: nil
  //        line_info_cnt: len = 0x0 (4 bytes)
  //        attach_btf_id: const = 0x0 (4 bytes)
  //        attach_prog_fd: const = 0x0 (4 bytes)
  //        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[const[BPF_PROG_TYPE_XDP, int32],
  //        const[BPF_XDP, int32], const[0, int32], const[0,
  //        int32]]_prog_token_fd_wrapper {
  //          void: buffer: {} (length 0x0)
  //        }
  //        pad: union _bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
  //        const[BPF_XDP, int32], const[0, int32], const[0, int32]]_pad_wrapper
  //        {
  //          value: const = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    size: len = 0x80 (8 bytes)
  //  ]
  //  returns fd_bpf_prog_xdp
  *(uint32_t*)0x20000100 = 0x12;
  *(uint32_t*)0x20000104 = 4;
  *(uint64_t*)0x20000108 = 0x20000000;
  *(uint8_t*)0x20000000 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000001, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000001, 0, 4, 4);
  *(uint16_t*)0x20000002 = 0;
  *(uint32_t*)0x20000004 = 0;
  *(uint8_t*)0x20000008 = 0;
  *(uint8_t*)0x20000009 = 0;
  *(uint16_t*)0x2000000a = 0;
  *(uint32_t*)0x2000000c = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000010, 1, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000010, 0, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20000010, 3, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000011, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000011, 1, 4, 4);
  *(uint16_t*)0x20000012 = 0x3c;
  *(uint32_t*)0x20000014 = 0;
  *(uint8_t*)0x20000018 = 0x95;
  *(uint8_t*)0x20000019 = 0;
  *(uint16_t*)0x2000001a = 0;
  *(uint32_t*)0x2000001c = 0;
  *(uint64_t*)0x20000110 = 0x20000040;
  memcpy((void*)0x20000040, "GPL\000", 4);
  *(uint32_t*)0x20000118 = 0;
  *(uint32_t*)0x2000011c = 0;
  *(uint64_t*)0x20000120 = 0;
  *(uint32_t*)0x20000128 = 0;
  *(uint32_t*)0x2000012c = 0;
  memset((void*)0x20000130, 0, 16);
  *(uint32_t*)0x20000140 = 0;
  *(uint32_t*)0x20000144 = 0xf;
  *(uint32_t*)0x20000148 = -1;
  *(uint32_t*)0x2000014c = 8;
  *(uint64_t*)0x20000150 = 0;
  *(uint32_t*)0x20000158 = 0;
  *(uint32_t*)0x2000015c = 0x10;
  *(uint64_t*)0x20000160 = 0;
  *(uint32_t*)0x20000168 = 0;
  *(uint32_t*)0x2000016c = 0;
  *(uint32_t*)0x20000170 = 0;
  *(uint32_t*)0x20000174 = 0;
  *(uint64_t*)0x20000178 = 0;
  *(uint64_t*)0x20000180 = 0;
  *(uint32_t*)0x20000188 = 0x10;
  *(uint32_t*)0x2000018c = 0;
  *(uint32_t*)0x20000190 = 0;
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000100ul, /*size=*/0x80ul);
}
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;
  loop();
  return 0;
}