Re: [PATCH v3 bpf-next 0/6] Enable writing xattr from BPF programs

Theodore Ts'o
2024-12-11T13:19:00Z

On Tue, Dec 10, 2024 at 02:06:21PM -0800, Song Liu wrote:
> Add support to set and remove xattr from BPF program. Also add
> security.bpf. xattr name prefix.

If the system allows for the execution of unprivileged BPF programs
(e.g., ones where a random user can load their own BPF programs), will
they have hte ability to set and remove security.bpf.* xattrs? If the
answer is yes, should this be disallowed?

I note that one of the use cases seems to be BPF-based LSM's, so we
may want to have something even more restrictive since otherwise any
BPF program could potentially have the same power as the LSM?

- Ted