// https://syzkaller.appspot.com/bug?id=f96183056b225b103dc49b8c60315bef60c83cbf
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.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 <unistd.h>

#ifndef __NR_dup
#define __NR_dup 23
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 29
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_write
#define __NR_write 64
#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 long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  install_segv_handler();
  intptr_t res = 0;
  NONFAILING(syz_open_dev(/*dev=*/0, /*id=*/0xd21, /*flags=*/0));
  NONFAILING(memcpy((void*)0x20000040, "/dev/snd/midiC#D#\000", 18));
  res = -1;
  NONFAILING(
      res = syz_open_dev(/*dev=*/0x20000040, /*id=*/2, /*flags=*/0x141101));
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_dup, /*oldfd=*/r[0]);
  if (res != -1)
    r[1] = res;
  NONFAILING(memcpy((void*)0x20000000, "/dev/dri/card#\000", 15));
  res = -1;
  NONFAILING(res = syz_open_dev(/*dev=*/0x20000000, /*id=*/0, /*flags=*/0));
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint32_t*)0x20000100 = 8);
  NONFAILING(*(uint32_t*)0x20000104 = 0x10001);
  NONFAILING(*(uint32_t*)0x20000108 = 0xb);
  NONFAILING(*(uint32_t*)0x2000010c = 0);
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xc02064b2, /*arg=*/0x20000100ul);
  syscall(__NR_mmap, /*addr=*/0x20ffd000ul, /*len=*/0x2000ul,
          /*prot=*/0x1000004ul, /*flags=*/0x12ul, /*fd=*/r[2],
          /*offset=*/0x100000000ul);
  syscall(__NR_ioctl, /*fd=*/-1, /*cmd=*/0xc02064b2, /*arg=*/0ul);
  NONFAILING(memset((void*)0x20000000, 48, 1));
  syscall(__NR_write, /*fd=*/r[1], /*data=*/0x20000000ul, /*len=*/0xfffffd2cul);
  return 0;
}