linux-kernel - [PATCH v2 bpf-next 04/10] bpf: don't allow create maps of per-cpu cgroup local storages

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Date:   Tue, 25 Sep 2018 16:21:08 +0100
From:   Roman Gushchin <guro@...com>
To:     <netdev@...r.kernel.org>
CC:     Song Liu <songliubraving@...com>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>, Roman Gushchin <guro@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: [PATCH v2 bpf-next 04/10] bpf: don't allow create maps of per-cpu cgroup local storages

Explicitly forbid creating map of per-cpu cgroup local storages.
This behavior matches the behavior of shared cgroup storages.

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Alexei Starovoitov <ast@...nel.org>
---
 kernel/bpf/map_in_map.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/map_in_map.c b/kernel/bpf/map_in_map.c
index 3bfbf4464416..99d243e1ad6e 100644
--- a/kernel/bpf/map_in_map.c
+++ b/kernel/bpf/map_in_map.c
@@ -24,7 +24,8 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
 	 * in the verifier is not enough.
 	 */
 	if (inner_map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
-	    inner_map->map_type == BPF_MAP_TYPE_CGROUP_STORAGE) {
+	    inner_map->map_type == BPF_MAP_TYPE_CGROUP_STORAGE ||
+	    inner_map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
 		fdput(f);
 		return ERR_PTR(-ENOTSUPP);
 	}
-- 
2.17.1