tree c67c2438b8b84c159ef0cbb9a04681c01b4c5da8
parent c25544735bf3a06a0090365aa89f43debad7b7dd
author James Hilliard <james.hilliard1@gmail.com> 1659310009 -0600
committer Andrii Nakryiko <andrii.nakryiko@gmail.com> 1660165639 -0700

libbpf: Skip empty sections in bpf_object__init_global_data_maps

The GNU assembler generates an empty .bss section. This is a well
established behavior in GAS that happens in all supported targets.

The LLVM assembler doesn't generate an empty .bss section.

bpftool chokes on the empty .bss section.

Additionally in bpf_object__elf_collect the sec_desc->data is not
initialized when a section is not recognized. In this case, this
happens with .comment.

So we must check that sec_desc->data is initialized before checking
if the size is 0.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20220731232649.4668-1-james.hilliard1@gmail.com