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Andrii Nakryiko 049a44dfd6 libbpf: Don't error out on CO-RE relos for overriden weak subprogs

[ Upstream commit e89d57d938 ]

During BPF static linking, all the ELF relocations and .BTF.ext
information (including CO-RE relocations) are preserved for __weak
subprograms that were logically overriden by either previous weak
subprogram instance or by corresponding "strong" (non-weak) subprogram.
This is just how native user-space linkers work, nothing new.

But libbpf is over-zealous when processing CO-RE relocation to error out
when CO-RE relocation belonging to such eliminated weak subprogram is
encountered. Instead of erroring out on this expected situation, log
debug-level message and skip the relocation.

Fixes: db2b8b0642 ("libbpf: Support CO-RE relocations for multi-prog sections")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220408181425.2287230-2-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-06-09 10:22:46 +02:00

api

tools api fs: Cache cgroupfs mount point

2021-02-17 15:09:08 -03:00

bpf

libbpf: Don't error out on CO-RE relos for overriden weak subprogs

2022-06-09 10:22:46 +02:00

lockdep

.gitignore: add SPDX License Identifier

2020-03-25 11:50:48 +01:00

perf

perf tools: Fix segfault accessing sample_id xyarray