diff options
| author | Song Liu <song@kernel.org> | 2025-06-22 23:38:53 -0700 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-07-02 14:18:20 +0200 |
| commit | 5bc9557c9f17c38ed8c9070c1d369d49eabea1a9 (patch) | |
| tree | 56969db634f3961d87ad23b8d07b70424f4c8ae5 | |
| parent | b95ee9049c93b05da66599d6e0d1fcfea291360b (diff) | |
bpf: Mark cgroup_subsys_state->cgroup RCU safe
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@kernel.org>
Link: https://lore.kernel.org/20250623063854.1896364-4-song@kernel.org
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
| -rw-r--r-- | kernel/bpf/verifier.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index a7d6e0c5928b..db01bf51c792 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -6993,6 +6993,10 @@ 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; @@ -7043,6 +7047,7 @@ 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"); } |