Re: [PATCH bpf-next v2] bpf: Update verification logic for LSM programs

[Alexei Starovoitov]

On Thu, Nov 5, 2020 at 3:06 PM KP Singh <kpsingh@xxxxxxxxxxxx> wrote:
>
> From: KP Singh <kpsingh@xxxxxxxxxx>
>
> The current logic checks if the name of the BTF type passed in
> attach_btf_id starts with "bpf_lsm_", this is not sufficient as it also
> allows attachment to non-LSM hooks like the very function that performs
> this check, i.e. bpf_lsm_verify_prog.
>
> In order to ensure that this verification logic allows attachment to
> only LSM hooks, the LSM_HOOK definitions in lsm_hook_defs.h are used to
> generate a BTF_ID set. Upon verification, the attach_btf_id of the
> program being attached is checked for presence in this set.
>
> Signed-off-by: KP Singh <kpsingh@xxxxxxxxxx>

I've added Fixes tag and applied to bpf tree.