diff options
| author | Tao Chen <chen.dylane@linux.dev> | 2025-04-07 11:57:52 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2025-04-09 16:28:51 -0700 |
| commit | a76116f422c442ab691b4dcabb25613486d34360 (patch) | |
| tree | dc689725c6a1d800fd56a2cbeaf2dbb3d65e4038 | |
| parent | 243911982aa9faf4361aa952f879331ad66933fe (diff) | |
bpf: Check link_create.flags parameter for multi_uprobe
The link_create.flags are currently not used for multi-uprobes, so return
-EINVAL if it is set, same as for other attach APIs.
We allow target_fd to have an arbitrary value for multi-uprobe, though,
as there are existing users (libbpf) relying on this.
Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250407035752.1108927-2-chen.dylane@linux.dev
| -rw-r--r-- | kernel/trace/bpf_trace.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index ec19942321e6..0f5906f43d7c 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3379,6 +3379,9 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr if (sizeof(u64) != sizeof(void *)) return -EOPNOTSUPP; + if (attr->link_create.flags) + return -EINVAL; + if (!is_uprobe_multi(prog)) return -EINVAL; |