netdev - [PATCH bpf-next 1/4] bpf: setup socket family and addresses in bpf_prog_test_run

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 13 Jul 2020 21:25:17 +0300
From:   Dmitry Yakunin <zeil@...dex-team.ru>
To:     alexei.starovoitov@...il.com, daniel@...earbox.net,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     sdf@...gle.com
Subject: [PATCH bpf-next 1/4] bpf: setup socket family and addresses in bpf_prog_test_run_skb

Now it's impossible to test all branches of cgroup_skb bpf program which
accesses skb->family and skb->{local,remote}_ip{4,6} fields because they
are zeroed during socket allocation. This commit fills socket family and
addresses from related fields in constructed skb.

Signed-off-by: Dmitry Yakunin <zeil@...dex-team.ru>
---
 net/bpf/test_run.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index bfd4ccd..a58b399 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -432,6 +432,21 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 	skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
 	skb_reset_network_header(skb);
 
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		sk->sk_family = AF_INET;
+		sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
+		sk->sk_daddr = ip_hdr(skb)->daddr;
+		break;
+	case htons(ETH_P_IPV6):
+		sk->sk_family = AF_INET6;
+		sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
+		sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
+		break;
+	default:
+		break;
+	}
+
 	if (is_l2)
 		__skb_push(skb, hh_len);
 	if (is_direct_pkt_access)
-- 
2.7.4