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Andrii Nakryiko 71754ee427 libbpf: fix offsetof() and container_of() to work with CO-RE

[ Upstream commit bdeeed3498c7871c17465bb4f11d1bc67f9098af ]

It seems like __builtin_offset() doesn't preserve CO-RE field
relocations properly. So if offsetof() macro is defined through
__builtin_offset(), CO-RE-enabled BPF code using container_of() will be
subtly and silently broken.

To avoid this problem, redefine offsetof() and container_of() in the
form that works with CO-RE relocations more reliably.

Fixes: 5fbc220862fc ("tools/libpf: Add offsetof/container_of macro in bpf_helpers.h")
Reported-by: Lennart Poettering <lennart@poettering.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20230509065502.2306180-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2023-07-23 13:46:49 +02:00

api

tools api fs: Cache cgroupfs mount point

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

bpf

libbpf: fix offsetof() and container_of() to work with CO-RE

2023-07-23 13:46:49 +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