[PATCH bpf-next 2/5] bpf: Mark struct bpf_cpumask as RCU protected

David Vernet
2023-03-16T01:41:35Z

struct bpf_cpumask is a BPF-wrapper around the struct cpumask type which
can be instantiated by a BPF program, and then queried as a cpumask in
similar fashion to normal kernel code. The previous patch in this series
makes the type fully RCU safe, allowing the type can be included in the
rcu_protected_type BTF ID list.

A subsequent patch will remove bpf_cpumask_kptr_get(), as it's no longer
useful now that the verifier allows us to use bpf_rcu_read_{un}lock() to
get an RCU-safe pointer.

Signed-off-by: David Vernet <void@manifault.com>
---
kernel/bpf/verifier.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 60793f793ca6..15b5c5c729f9 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -4599,6 +4599,7 @@ static bool in_rcu_cs(struct bpf_verifier_env *env)
BTF_SET_START(rcu_protected_types)
BTF_ID(struct, prog_test_ref_kfunc)
BTF_ID(struct, cgroup)
+BTF_ID(struct, bpf_cpumask)
BTF_SET_END(rcu_protected_types)

static bool rcu_protected_object(const struct btf *btf, u32 btf_id)
--
2.39.0