[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 at huawei.com>
> 
> 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.