How to change file attributes in Android: a complete guide

The operating system Android is built on the Linux kernel, which means a strict hierarchy of access rights and file ownership. For the average user, these mechanisms are hidden, but when trying to deeply modify the system or work with protected data, it becomes necessary to change the attributes of the file in Android. This may be required to fix application errors, manually edit system configs, or configure specific software.

Unlike desktop operating systems, where you often have full rights by default, the mobile platform limits access to the root directory. Standard file managers show only the contents, but do not allow you to change permissions (chmod) or owner (chown) without special tools. Understanding the permission structure is the first step to successfully managing your device's file system.

Changing attributes is not just a technical procedure, but a powerful tool for controlling your device. However, careless handling of system files can lead to unstable operation or a “bootloop”. In this material, we will analyze safe methods of working with access rights, using both graphical interfaces and console commands.

The basic structure of access rights in Linux and Android

The file system operates with three main types of rights: reading (Read), writing (Write) and execution (Execute). These rights are assigned to three categories of users: file owner (Owner), group (Group) and everyone else (Others). Android this model works exactly the same as in desktop Linux, ensuring data security.

Numerical representation of rights allows you to quickly set configurations. For example, a value of 755 means that the owner has full rights (4+2+1), and the group and others have only read and execute rights (4+1). Understanding this logic is necessary to correctly change file attributes in Android, especially when working with binaries or scripts.

It is important to distinguish between regular files and directories. For folders, the "execute" right actually means "access content". If you disable execution for a directory, then no process will be able to read the files inside it, even if the rights to the files themselves allow reading.

Changing these parameters without root access is only possible within your user folder. System partitions are typically mounted read-only (ro) for common applications. Deep changes will require advanced access.

• 🔒 Read (r): Allows you to view the contents of a file or a list of files in a folder.
• ✏️ Write (w): Grants the right to change a file, delete it, or create new files in a folder.
• ⚡ Execute (x): Allows running executable files or entering a directory.

⚠️ Attention: Changing the rights to system files in the /system or /vendor partitions may result in the system refusing to boot. Always create backup copies before making changes.

Using advanced file managers

The most accessible way to change file attributes in Android is to use specialized applications such as MT Manager, Solid Explorer or Root Explorer. These apps provide a graphical interface for working with permissions, which greatly simplifies the process for those who are not familiar with console commands.

To work with system files, the application must have root access. After obtaining root access, you can go to any directory, hold your finger on the desired file and select “Properties” or “Permissions”. A window will open with checkboxes corresponding to the rights r, w, x for owner, group and others.

Some managers also allow you to change UID and GID (user and group identifiers), which is critical for the operation of some system services. For example, a file hosts or libraries .so often require strictly defined owners for correct functioning.

⚠️ Attention: Application interfaces may be updated. The location of the buttons may differ in new versions, so look for the "Permissions" or "Properties" section.

When working with a graphical interface, it is easy to make a mistake by accidentally unchecking the wrong item. Be careful: changing the execution bit on a system library may make it inoperable. Always check the original rights values, if you have them, or check with similar files on working devices.

Working with rights through the ADB console

For more precise control and automation of processes, USB debugging (ADB) is often used. This method allows you to change file attributes in Android even without root access, if we are talking about user data, or with root access through the command su. ADB is a bridge between a computer and a smartphone.

The main command for changing rights is chmod. The syntax is simple: you specify a numeric value or alphabetic symbols and the path to the file. For example, to make a script executable, the command chmod +xis used. This is a universal administrator tool.

adb shell
su
chmod 755 /data/local/tmp/myscript.sh

In addition to changing rights, through ADB you can change the owner of a file using the command chown. This is necessary when you copy files from one security context to another and the system refuses to run them due to a UID mismatch. The command chown root:root file will return superuser rights.

Using the console provides the advantage of being able to bulk change attributes. You can apply permissions recursively to the entire folder and all subfiles by adding the -Rflag. This saves time when setting up complex system modifications.

• 📡 Connection: Make sure that USB debugging is enabled on your phone in the "For Developers" menu.
• 💻 Drivers: The ADB drivers for your device model must be installed on your computer.
• 🔐 Root access: For system operations in the console, you will need to enter a command su and confirmation on the phone screen.

What to do if ADB does not see the device?

Make sure that the USB cable supports data transfer, and not just charging. Try a different USB port or restart the adb service with the command "adb kill-server" and "adb start-server".

Changing attributes via Termux

The application Termux turns your smartphone into a full-fledged Linux station. It allows you to change file attributes in Android directly from the device, without connecting to a computer. This is especially convenient when you need to quickly correct access rights “in the field.”

To work with system files in Termux, you will need root access and a package proot or direct access via su. After obtaining superuser rights (su), you can use standard Linux utilities: ls -l for viewing, chmod for rights and chown for owners. The interface is completely text-based.

The uniqueness of Termux lies in the ability to install additional packages, such as mc (Midnight Commander). This is a file manager with a text interface that allows you to conveniently navigate through the file system and change rights through the F10 menu without entering long commands manually.

Working in Termux requires care. An error in the path or file name can result in changing permissions on the wrong object. Use Tab key completion to minimize the risk of typos. This is standard practice for all system administrators.

Table of Numeric Permission Codes

Understanding numeric codes is the key to working quickly. Instead of going through checkboxes, an experienced user immediately sees the desired value. Below is a table of the most common configurations of rights found in the Android system.

Code	Symbolic designation	Description of access	Typical application
644	rw-r--r--	Owner reads/writes, others read only	Configuration files, texts
755	rwxr-xr-x	Owner full access, others read/execute	Folders, executable scripts
777	rwxrwxrwx	Full access for everyone	Temporary folders, shared resources (dangerous!)
600	rw-------	Only the owner reads and writes	Keys, passwords, private data

Using the 777 code is often considered a bad security practice, since it opens the file for modification by any process on the system. T Android this could allow malware to infiltrate a legitimate file. Try to use the minimum necessary rights.

If you are not sure what rights a file should have, find a similar file on the system that works correctly and copy its attributes. Comparison with a standard is a reliable method of diagnosis.

Specifics of working with SELinux

In modern versions of Android (starting from 5.0 and especially 10+), classic Linux rights (chmod/chown) are often not enough. SELinux (Security-Enhanced Linux) comes into play. This is a mandatory access control system that imposes an additional layer of security.

Even if you set permissions to 777 on a file, SELinux can block access to it if the security context does not match the system policy. The files have labels, for example, u:object_r:system_file:s0. Changing these labels requires the command chcon.

To change the context, a syntax similar to standard Linux is used, but taking into account Android specifics. It is often necessary to put SELinux into Permissive (permissive) mode for changes to take effect, although this reduces the overall security of the device.

chcon u:object_r:system_file:s0 /system/bin/myapp

Working with SELinux is complex and requires in-depth knowledge. Errors here lead to the application simply not starting, although formally all rights are in place. Logs logcat or dmesg will help identify blockages on the part of SELinux.

Possible risks and recovery

Incorrect change of attributes is one of common causes of software failures. If a system process loses access to its libraries, it crashes. In the worst case, this causes a cyclic reboot of the device (bootloop).

If you changed the rights to a critical file and the phone stopped booting, do not panic. Booting into Recovery mode and resetting the settings (Wipe Data) often helps, although this will delete user data. A softer method is flashing over without resetting the data.

To prevent disasters, use tools like Titanium Backup or the built-in recovery functions to create restore points before any experiments. Saving original files with attributes is a sign of good form in modding.

⚠️ Attention: On devices with a /system partition mounted read-only (system-as-root), changing attributes is only possible after unlocking the bootloader and remounting the partition or using magic modules (Magisk).

Restoring default rights maybe not always. If you don't remember the original values, you will have to look for stock firmware and pull out the files from there. Therefore, writing down changes in a notepad before making them is an excellent habit.

Is it possible to restore rights without reinstalling the OS?

Only if you have a full backup (Nandroid) or TWRP allows you to restore attributes from a backup copy of files. Otherwise, you will need to manually set rights, which is very labor-intensive.

Frequently asked questions (FAQ)

Do you need root access to change the attributes of any file?

For system files in the /system, /vendor, /odm sections - yes, absolutely. Files in your user folder (/sdcard, /storage/emulated) do not require root, since you are their owner by default.

What does the "Operation not permitted" error mean with chmod?

This error means that the current user does not have enough rights to change attributes. Either you haven't started the terminal as root (su), or the file is on a write-protected partition, or SELinux is interfering.

Is it possible to change file attributes on a non-root device via ADB?

You can only change the permissions of files that you own (usually in /sdcard). It is not possible to change system file permissions without root access via ADB for Android security reasons.

How to find the current file permissions without a computer?

Use the Termux application and command ls -l path_to_file or a file manager with a property view function, such as Solid Explorer or MT Manager.

Is it safe to set permissions 777 on a folder with photos?

Technically this is possible, but not recommended. This opens up access to your personal photos to any application on the system, creating the risk of data leakage. It is better to use standard access rights.