netdev - [PATCH] test_bpf: fix the dummy skb after dissector changes

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-next>] [day] [month] [year] [list]

Date:   Mon, 12 Sep 2016 13:04:57 +0100
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     <netdev@...r.kernel.org>, Hadar Hen Zion <hadarh@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH] test_bpf: fix the dummy skb after dissector changes

Commit d5709f7ab776 ("flow_dissector: For stripped vlan, get vlan
info from skb->vlan_tci") made flow dissector look at vlan_proto
when vlan is present.  Since test_bpf sets skb->vlan_tci to ~0
(including VLAN_TAG_PRESENT) we have to populate skb->vlan_proto.

Fixes false negative on test #24:
test_bpf: #24 LD_PAYLOAD_OFF jited:0 175 ret 0 != 42 FAIL (1 times)

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@...ronome.com>
---
 lib/test_bpf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 93f45011a59d..94346b4d8984 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -5485,6 +5485,7 @@ static struct sk_buff *populate_skb(char *buf, int size)
 	skb->hash = SKB_HASH;
 	skb->queue_mapping = SKB_QUEUE_MAP;
 	skb->vlan_tci = SKB_VLAN_TCI;
+	skb->vlan_proto = htons(ETH_P_IP);
 	skb->dev = &dev;
 	skb->dev->ifindex = SKB_DEV_IFINDEX;
 	skb->dev->type = SKB_DEV_TYPE;
-- 
1.9.1