Final Project — Operating Systems 2026-2

Author: Reyna Mendez Cristian Ignacio

Requirements

GitHub account with access to GitHub Codespaces
Approximately 10 GB of free space in the Codespace (kernel compilation)
Approximately 20 minutes to compile

Step 1 — Clone and open in Codespaces

git clone https://github.com/zKaaanon/ProyectoFinalSO.git

Or directly from GitHub:

Enter the repository
Press the green Code button
Go to the Codespaces tab
Select Create codespace on main

Step 2 — Compile the vulnerable kernel (6.6.86)

From the Codespace terminal:

cd /workspaces/ProyectoFinalSO/linux-vulnerable

git remote add upstream https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

git fetch upstream v6.6.86

git checkout FETCH_HEAD

make olddefconfig

make bzImage -j$(nproc)

At the end of compilation, the following message should appear:

Kernel: arch/x86/boot/bzImage is ready

Step 3 — Boot the vulnerable virtual machine

cd /workspaces/ProyectoFinalSO

./boot-vulnerable.sh

Credentials

User	Password
attacker	attacker
root	root

Step 4 — Mount the shared directory and run the PoC

su -c "mount -t 9p -o trans=virtio host0 /mnt/shared" root

python3 /mnt/shared/poc.py

Expected result

[*] uid actual : 1000
[*] splice(file->pipe) : 32 bytes
[*] splice(pipe->AEAD) : 32 bytes
[*] Error esperado (HMAC inválido): Bad message
[!] La escritura ocurrió ANTES de que fallara el HMAC

Project structure

ProyectoFinalSO/
├── boot-vulnerable.sh      # Script para arrancar la VM con QEMU
├── shared/
│   └── poc.py              # Proof of Concept del CVE
├── linux-vulnerable/       # Fuentes del kernel (checkout a v6.6.86)
└── Reporte.md              # Análisis técnico completo

ProyectoFinalSO

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Final Project — Operating Systems 2026-2

Requirements

Step 1 — Clone and open in Codespaces

Step 2 — Compile the vulnerable kernel (6.6.86)

Step 3 — Boot the vulnerable virtual machine

Credentials

Step 4 — Mount the shared directory and run the PoC

Expected result

Project structure