From: Chenbo Feng <fengc@google.com>
Date: Thu, 1 Jun 2017 01:15:59 +0000 (-0700)
Subject: bpf: Allow CGROUP_SKB eBPF program to access sk_buff
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fb9a307d11d6;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

bpf: Allow CGROUP_SKB eBPF program to access sk_buff

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@google.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 14ccb0759fa4..8acae64df255 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2426,6 +2426,7 @@ 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;