bpf: btf: Check array t->size
This patch ensures array's t->size is 0.
The array size is decided by its individual elem's size and the
number of elements. Hence, t->size is not used and
it must be 0.
A test case is added to test_btf.c
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 3d20aa1..84ad532f 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -1342,6 +1342,11 @@ static s32 btf_array_check_meta(struct btf_verifier_env *env,
return -EINVAL;
}
+ if (t->size) {
+ btf_verifier_log_type(env, t, "size != 0");
+ return -EINVAL;
+ }
+
/* Array elem type and index type cannot be in type void,
* so !array->type and !array->index_type are not allowed.
*/
