Re: [RFC PATCH security-next 1/4] security: Hornet LSM

Jonathan Corbet
2025-03-21T17:32:47Z

Blaise Boscaccy <bboscaccy@linux.microsoft.com> writes:

> This adds the Hornet Linux Security Module which provides signature
> verification of eBPF programs.
>
> Hornet uses a similar signature verification scheme similar to that of
> kernel modules. A pkcs#7 signature is appended to the end of an
> executable file. During an invocation of bpf_prog_load, the signature
> is fetched from the current task's executable file. That signature is
> used to verify the integrity of the bpf instructions and maps which
> where passed into the kernel. Additionally, Hornet implicitly trusts any
> programs which where loaded from inside kernel rather than userspace,
> which allows BPF_PRELOAD programs along with outputs for BPF_SYSCALL
> programs to run.
>
> Hornet allows users to continue to maintain an invariant that all code
> running inside of the kernel has been signed and works well with
> light-skeleton based loaders, or any statically generated program that
> doesn't require userspace instruction rewriting.
>
> Signed-off-by: Blaise Boscaccy <bboscaccy@linux.microsoft.com>
> ---
> Documentation/admin-guide/LSM/Hornet.rst | 51 +++++

You will need to add that file to .../index.rst, or it won't be included
in the docs build.

Thanks,

jon