MYSYSAD · Kernel Simulator

🐧 Path Traversal & Permission Simulator

Simulate how the Linux kernel evaluates EACCES across every directory in a path. Pinpoint the exact node causing Permission Denied.

POSIX.1-2017 §4.4 DAC Model

Process Context Who is knocking?

Process User UID

Process Group GID

Desired Action BIT

Target Path (absolute)

Presets: /var/www/html/app/config.php /etc/nginx/nginx.conf /home/deploy/.ssh/authorized_keys /srv/app/storage/logs/app.log /opt/myapp/bin/server /root/.config/secret

Directory Tree

Common Permission Patterns

755

rwxr-xr-x

Standard directory

750

rwxr-x---

Owner+group only

700

rwx------

Owner only

711

rwx--x--x

Traverse only

644

rw-r--r--

Standard file

600

rw-------

Private file

640

rw-r-----

Owner+group read

777

rwxrwxrwx

⚠ World-writable

Evaluates POSIX DAC rules across every node in the path tree above. Press Ctrl+Enter to run.

Simulation Results

Kernel Traversal Log

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