On Mon, Dec 14, 2020 at 1:58 AM Gilad Reti <gilad.reti@xxxxxxxxx> wrote: > > Hello there, > libbpf provides BPF_CORE_READ macros for reading struct members in a > CO-RE compatible way. By default those macros reduct to the relevant > bpf_probe_read_kernel functions. As far as I could tell, there are no > variants of this macros that wrap the _user variants of the read > functions. Are there any plans to support ones? BPF_CORE_READ() are using BPF CO-RE and thus emit relocations, which will be adjusted by libbpf to match kernel struct layouts by using kernel's BTF(s). Because of this, having xxx_user() variants doesn't make much sense, because libbpf can't relocate field offsets against user-space types (as there is no BTF for user-space applications, typically). Which is why there are no BPF_CORE_READ_USER()-like macros. What's your use case, though? There might be a valid one that we are not aware of, so please provide more details. Thanks. > Thanks, > Gilad Reti.
