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

Blaise Boscaccy
2025-03-31T20:09:55Z

Jonathan Corbet <corbet@lwn.net> writes:

> 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

Good catch, will get that fixed. Thanks Jon.