[PATCH 3.10 145/268] packet: round up linear to header len

Willy Tarreau
2017-06-19T18:38:30Z

From: Willem de Bruijn <willemb@google.com>

commit 57031eb794906eea4e1c7b31dc1e2429c0af0c66 upstream.

Link layer protocols may unconditionally pull headers, as Ethernet
does in eth_type_trans. Ensure that the entire link layer header
always lies in the skb linear segment. tpacket_snd has such a check.
Extend this to packet_snd.

Variable length link layer headers complicate the computation
somewhat. Here skb->len may be smaller than dev->hard_header_len.

Round up the linear length to be at least as long as the smallest of
the two.

[js] no virtio helpers in 3.12

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
net/packet/af_packet.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 4b1734a..9bff8a9 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2242,7 +2242,7 @@ static int packet_snd(struct socket *sock,
int vnet_hdr_len;
struct packet_sock *po = pkt_sk(sk);
unsigned short gso_type = 0;
- int hlen, tlen;
+ int hlen, tlen, linear;
int extra_len = 0;

/*
@@ -2336,7 +2336,9 @@ static int packet_snd(struct socket *sock,
err = -ENOBUFS;
hlen = LL_RESERVED_SPACE(dev);
tlen = dev->needed_tailroom;
- skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len,
+ linear = vnet_hdr.hdr_len;
+ linear = max(linear, min_t(int, len, dev->hard_header_len));
+ skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto out_unlock;
--
2.8.0.rc2.1.gbe9624a