Re: [RFC PATCH bpf 0/6] bpf: Disallow interpreter fallback for interpreter-unsupported insns

[Alexei Starovoitov]

On Tue Jun 30, 2026 at 7:59 PM PDT, Leon Hwang wrote:
> On 1/7/26 07:12, Alexei Starovoitov wrote:
>> On Fri Jun 26, 2026 at 8:43 AM PDT, Leon Hwang wrote:
> [...]
>> 
>> I don't think we need such fallback in patch [3].
>
> Do you mean we can add the internal BPF_ADDR_PERCPU insn support to the
> interpreter?

No. See why CONFIG_BPF_JIT_ALWAYS_ON was introduced.
The interpreter is a security hole.
It has to be _compiled out_ of the kernel.
Hence all patches that improve fallback to interpreter are misguided.
The interpreter has to be removed completely... sooner or later.