Mark struct cgroup_subsys_state->cgroup as safe under RCU read lock. This
will enable accessing css->cgroup from a bpf css iterator.
Signed-off-by: Song Liu <song@xxxxxxxxxx>
---
kernel/bpf/verifier.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 279a64933262..e2f53dc8766a 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -7058,6 +7058,10 @@ BTF_TYPE_SAFE_RCU(struct css_set) {
struct cgroup *dfl_cgrp;
};
+BTF_TYPE_SAFE_RCU(struct cgroup_subsys_state) {
+ struct cgroup *cgroup;
+};
+
/* RCU trusted: these fields are trusted in RCU CS and can be NULL */
BTF_TYPE_SAFE_RCU_OR_NULL(struct mm_struct) {
struct file __rcu *exe_file;
@@ -7108,6 +7112,7 @@ static bool type_is_rcu(struct bpf_verifier_env *env,
BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct task_struct));
BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct cgroup));
BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct css_set));
+ BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct cgroup_subsys_state));
return btf_nested_type_is_trusted(&env->log, reg, field_name, btf_id, "__safe_rcu");
}
--
2.47.1
