Re: [PATCH bpf-next] bpf, arm64: sign return address for jited code

[Xu Kuohai]

On 4/2/2022 4:22 AM, Daniel Borkmann wrote:
> On 3/18/22 11:29 AM, Xu Kuohai wrote:
> > Sign return address for jited code when the kernel is built with pointer
> > authentication enabled.
> >
> > 1. Sign lr with paciasp instruction before lr is pushed to stack. Since
> >     paciasp acts like landing pads for function entry, no need to insert
> >     bti instruction before paciasp.
> >
> > 2. Authenticate lr with autiasp instruction after lr is poped from stack.
> >
> > Signed-off-by: Xu Kuohai <xukuohai@xxxxxxxxxx>
>
> This would need a rebase, but please also use the commit description to 
> provide
> some more details how this inter-operates wrt BPF infra such as tail 
> calls and
> BPF-2-BPF calls when we look back into this in few months from now.
>
> Thanks,
> Daniel
> .

updated in v2, thanks.