Re: [PATCH bpf-next v4 0/4] Use correct destructor kfunc types

[Alexei Starovoitov]

On Mon, Jan 5, 2026 at 5:56 AM Viktor Malik <vmalik@xxxxxxxxxx> wrote:
>
> On 11/26/25 23:17, Sami Tolvanen wrote:
> > Hi folks,
> >
> > While running BPF self-tests with CONFIG_CFI (Control Flow
> > Integrity) enabled, I ran into a couple of failures in
> > bpf_obj_free_fields() caused by type mismatches between the
> > btf_dtor_kfunc_t function pointer type and the registered
> > destructor functions.
> >
> > It looks like we can't change the argument type for these
> > functions to match btf_dtor_kfunc_t because the verifier doesn't
> > like void pointer arguments for functions used in BPF programs,
> > so this series fixes the issue by adding stubs with correct types
> > to use as destructors for each instance of this I found in the
> > kernel tree.
> >
> > The last patch changes btf_check_dtor_kfuncs() to enforce the
> > function type when CFI is enabled, so we don't end up registering
> > destructors that panic the kernel.
>
> Hi,
>
> this seems to have slipped through the cracks so I'm bumping the thread.
> It would be nice if we could merge this.

It did. Please rebase, resend.