From: Feng Zhou zhoufeng.zf@bytedance.com
When tracing a kernel function with arg type is u32*, btf_ctx_access() would report error: arg2 type INT is not a struct.
The commit bb6728d75611 ("bpf: Allow access to int pointer arguments in tracing programs") added support for int pointer, but don't skip modifiers before checking it's type. This patch fixes it.
Fixes: bb6728d75611 ("bpf: Allow access to int pointer arguments in tracing programs") Co-developed-by: Chengming Zhou zhouchengming@bytedance.com Signed-off-by: Chengming Zhou zhouchengming@bytedance.com Signed-off-by: Feng Zhou zhoufeng.zf@bytedance.com --- kernel/bpf/btf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 593c45a294d0..17c65de1e48b 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -5913,9 +5913,8 @@ static bool is_int_ptr(struct btf *btf, const struct btf_type *t) /* t comes in already as a pointer */ t = btf_type_by_id(btf, t->type);
- /* allow const */ - if (BTF_INFO_KIND(t->info) == BTF_KIND_CONST) - t = btf_type_by_id(btf, t->type); + /* skip modifiers */ + t = btf_type_skip_modifiers(btf, t->type, NULL);
return btf_type_is_int(t); }