[$] User namespaces + file capabilities = trouble
User namespaces are a key part of the kernel's toolkit for assembling containers; processes within a user namespace can appear to have full root access to the system while gaining no extra privileges in the wider system. At least, that is the intent. In practice, keeping privilege contained within a user namespace has often turned out to be difficult. As an example, consider this small patch…
We haven't written up this one. LWN has the full story — the link below goes straight to it.
