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libbpf: Pass BPF token from find_prog_btf_id to BPF_BTF_GET_FD_BY_ID

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Pass BPF token from bpf_program__set_attach_target to
BPF_BTF_GET_FD_BY_ID bpf command.
When freplace program attaches to target program, it needs to look up
for BTF of the target, this may require BPF token, if, for example,
running from user namespace.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20250317174039.161275-4-mykyta.yatsenko5@gmail.com
This commit is contained in:
Mykyta Yatsenko
2025-03-17 17:40:38 +00:00
committed by Andrii Nakryiko
parent 009a8cb452
commit 90844e28dc
5 changed files with 23 additions and 9 deletions
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src/bpf.h
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@@ -487,9 +487,10 @@ LIBBPF_API int bpf_link_get_next_id(__u32 start_id, __u32 *next_id);
struct bpf_get_fd_by_id_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 open_flags; /* permissions requested for the operation on fd */
__u32 token_fd;
size_t :0;
};
#define bpf_get_fd_by_id_opts__last_field open_flags
#define bpf_get_fd_by_id_opts__last_field token_fd
LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_prog_get_fd_by_id_opts(__u32 id,