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| author | Jiri Olsa <jolsa@kernel.org> | 2026-06-11 14:42:26 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-06-15 03:24:25 +0300 |
| commit | 26330a9226417c9a3395db9fdb403f7d7371e6b7 (patch) | |
| tree | e0dd8007fb15b81bfcedfe3332ba508ac7d92a27 /include/uapi/linux | |
| parent | 65d81609e93140d8dd745fd41eb8a195f83ba7cd (diff) | |
| download | linux-26330a9226417c9a3395db9fdb403f7d7371e6b7.tar.xz | |
bpf: Add support to specify uprobe_multi target via file descriptor
Allow uprobe_multi link to identify the target binary by an already
opened file descriptor.
Adding new BPF_F_UPROBE_MULTI_PATH_FD flag and the path_fd field for
the attr.link_create.uprobe_multi struct.
When the flag is set, we resolve the target from path_fd, without the
flag, we keep the existing string path behavior.
I don't see a use case for supporting O_PATH file descriptors, because
we need to read the binary first to get probes offsets, so I'm using
the CLASS(fd, f), which fails for O_PATH fds.
Assisted-by: Codex:GPT-5.4
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260611114230.950379-4-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/bpf.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 11dd610fa5fa..89b36de5fdbb 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1327,7 +1327,11 @@ enum { * BPF_TRACE_UPROBE_MULTI attach type to create return probe. */ enum { - BPF_F_UPROBE_MULTI_RETURN = (1U << 0) + /* Get return uprobe. */ + BPF_F_UPROBE_MULTI_RETURN = (1U << 0), + + /* Get path from provided path_fd. */ + BPF_F_UPROBE_MULTI_PATH_FD = (1U << 1), }; /* link_create.netfilter.flags used in LINK_CREATE command for @@ -1864,6 +1868,7 @@ union bpf_attr { __u32 cnt; __u32 flags; __u32 pid; + __u32 path_fd; } uprobe_multi; struct { union { |