// https://syzkaller.appspot.com/bug?id=a7ecc3cf7a6c3f91078de052f071f49e7e0a9dcd
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_mkdirat
#define __NR_mkdirat 34
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif
#ifndef __NR_prctl
#define __NR_prctl 167
#endif
#ifndef __NR_preadv
#define __NR_preadv 69
#endif

static long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000,
          /*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=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 79 73 79 73 00} (length 0x8)
  //    }
  //    mode: open_mode = 0x1 (8 bytes)
  //  ]
  memcpy((void*)0x20000040, "./mysys\000", 8);
  syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x20000040ul,
          /*mode=S_IXOTH*/ 1ul);
  //  mount arguments: [
  //    src: nil
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 79 73 79 73 00} (length 0x8)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {73 79 73 66 73 00} (length 0x6)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x20000100, "./mysys\000", 8);
  memcpy((void*)0x20000200, "sysfs\000", 6);
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x20000100ul, /*type=*/0x20000200ul,
          /*flags=*/0ul, /*data=*/0ul);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 79 73 79 73 2f 62 75 73 2f 70 63 69 2f 64 65 76 69
  //      63 65 73 2f 30 30 30 30 3a 30 30 3a 30 32 2e 30 2f 72 65 73 6f 75 72
  //      63 65 30 00} (length 0x2f)
  //    }
  //    flags: open_flags = 0x2 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x20000300,
         "./mysys/bus/pci/devices/0000:00:02.0/resource0\000", 47);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000300ul,
                /*flags=O_RDWR*/ 2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  mmap$binder arguments: [
  //    addr: VMA[0x3000]
  //    len: len = 0x3000 (4 bytes)
  //    prot: const = 0x1 (8 bytes)
  //    flags: const = 0x11 (8 bytes)
  //    fd: fd_binder (resource)
  //    offset: intptr = 0x0 (8 bytes)
  //  ]
  //  returns binder_ptr
  syscall(__NR_mmap, /*addr=*/0x20ffd000ul, /*len=*/0x3000, /*prot=*/1ul,
          /*flags=*/0x11ul, /*fd=*/r[0], /*offset=*/0ul);
  //  prctl$PR_SET_MM arguments: [
  //    option: const = 0x23 (8 bytes)
  //    opt: prctl_mm_option = 0xa (8 bytes)
  //    arg: VMA[0x2000]
  //  ]
  syscall(__NR_prctl, /*option=*/0x23ul, /*opt=PR_SET_MM_ENV_START*/ 0xaul,
          /*arg=*/0x202d5000ul, 0, 0);
  //  syz_open_procfs arguments: [
  //    pid: pid (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {65 6e 76 69 72 6f 6e 00} (length 0x8)
  //    }
  //  ]
  //  returns fd
  memcpy((void*)0x200001c0, "environ\000", 8);
  res = -1;
  res = syz_open_procfs(/*pid=*/-1, /*file=*/0x200001c0);
  if (res != -1)
    r[1] = res;
  //  preadv arguments: [
  //    fd: fd (resource)
  //    vec: ptr[in, array[iovec[out, array[int8]]]] {
  //      array[iovec[out, array[int8]]] {
  //        iovec[out, array[int8]] {
  //          addr: ptr[out, buffer] {
  //            buffer: (DirOut)
  //          }
  //          len: len = 0x200000b1 (8 bytes)
  //        }
  //      }
  //    }
  //    vlen: len = 0x1 (8 bytes)
  //    off_low: int32 = 0xc002a0 (4 bytes)
  //    off_high: int32 = 0x0 (4 bytes)
  //  ]
  *(uint64_t*)0x20001400 = 0x20000040;
  *(uint64_t*)0x20001408 = 0x200000b1;
  syscall(__NR_preadv, /*fd=*/r[1], /*vec=*/0x20001400ul, /*vlen=*/1ul,
          /*off_low=*/0xc002a0, /*off_high=*/0);
  return 0;
}