Security model

Linux:

• Has evolved significantly in terms of security features (e.g., SELinux, AppArmor, namespaces, cgroups).

• However, the larger attack surface of the monolithic kernel makes it more vulnerable to exploits in kernel modules or subsystems.

QNX:

• Enhanced security due to its microkernel design, which limits the number of functions running in kernel space.

• Most services (including device drivers) run in user space, reducing the attack surface and minimizing the risk of system-wide compromise. Includes features like access control, secure boot, and cryptography for highly sensitive embedded systems.