Commits on Mar 7, 2022

1. btf: include CO-RE relocations of bpf2bpf subprograms …

   ProgramSpecs read from an ELF contain the full instruction streams from the
   bpf2bpf subprograms they call. When marshaling a program to be inserted into
   the kernel, FuncInfos and LineInfos are collected from all called subprogs,
   but CO-RE relocations were notably skipped after the linker rework in 9d739bd.
   
   This commit gathers CO-RE relos for all subprogs included in the final
   instruction stream and modifies their offsets to point to their new locations.
   
   Signed-off-by: Timo Beckers <timo@isovalent.com>

   

   ti-mo committed Mar 7, 2022
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2. btf: add CO-RE read test that fails unless relocations were correctly… …

   … applied
   
   The linker rework in 9d739bd caused a piece of code that appended CORERelos
   to the entrypoint instruction stream to be forgotten. The existing CO-RE tests
   were all written in a way where the BPF programs would return 0 (success) if
   no CO-RE relocations were applied at all.
   
   This caused CO-RE relocations against functions (subprogs) that were only
   included by a bpf2bpf call to be skipped.
   
   This patch adds a broken test program that returns non-zero if left unaltered,
   and requires CO-RE relocation against another BTF blob to return 0.
   Additionally, the checks are performed from a non-inlined subprogram to ensure
   CO-RE relocations against subprogs work.
   
   Signed-off-by: Timo Beckers <timo@isovalent.com>

   

   ti-mo committed Mar 7, 2022
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