netdev - [PATCH net-next 1/2] bpf: Allow CGROUP_SKB eBPF program to access sk

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Date:   Wed, 31 May 2017 11:06:52 -0700
From:   Chenbo Feng <chenbofeng.kernel@...il.com>
To:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Cc:     Lorenzo Colitti <lorenzo@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: [PATCH net-next 1/2] bpf: Allow CGROUP_SKB eBPF program to access sk_buff

From: Chenbo Feng <fengc@...gle.com>

This allows cgroup eBPF program to classify packet based on their
protocol or other detail information. Currently program need
CAP_NET_ADMIN privilege to attach a cgroup eBPF program, and A
process with CAP_NET_ADMIN can already see all packets on the system,
for example, by creating an iptables rules that causes the packet to
be passed to userspace via NFLOG.

Signed-off-by: Chenbo Feng <fengc@...gle.com>
---
 kernel/bpf/verifier.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 339c8a1..94a9bc9 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2419,6 +2419,7 @@ static bool may_access_skb(enum bpf_prog_type type)
 	case BPF_PROG_TYPE_SOCKET_FILTER:
 	case BPF_PROG_TYPE_SCHED_CLS:
 	case BPF_PROG_TYPE_SCHED_ACT:
+	case BPF_PROG_TYPE_CGROUP_SKB:
 		return true;
 	default:
 		return false;
-- 
2.7.4