Messages in this thread | | | Subject | Re: [PATCH bpf-next] bpf, arm64: sign return address for jited code | From | Daniel Borkmann <> | Date | Fri, 1 Apr 2022 22:22:51 +0200 |
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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@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
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