On Wed, Nov 23, 2022 at 9:32 PM Yonghong Song <yhs@xxxxxx> wrote: > > @@ -16580,6 +16682,8 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr, bpfptr_t uattr) > env->bypass_spec_v1 = bpf_bypass_spec_v1(); > env->bypass_spec_v4 = bpf_bypass_spec_v4(); > env->bpf_capable = bpf_capable(); > + env->rcu_tag_supported = > + btf_find_by_name_kind(btf_vmlinux, "rcu", BTF_KIND_TYPE_TAG) > 0; It needs btf_vmlinux != NULL check as well, since we error earlier only on IS_ERR(btf_vmlinux). btf_vmlinux can be NULL at this point when CONFIG_DEBUG_INFO_BTF is not set. In the previous discussion I thought we agreed to fix convert_ctx_accesses() vs incorrect application of BPF_PROBE_MEM for PTR_TRUSTED pointers. But I didn't find it in this patch. So I'm fixing both issues and planning to apply after testing.
