[PATCH net] net: ip6_gre: set dev->hard_header_len when using header_ops

[PATCH net] net: ip6_gre: set dev->hard_header_len when using header_ops

[Antoine Tenart]

syzkaller managed to crash the kernel using an NBMA ip6gre interface. I
could reproduce it creating an NBMA ip6gre interface and forwarding
traffic to it:

  skbuff: skb_under_panic: text:ffffffff8250e927 len:148 put:44 head:ffff8c03c7a33
  ------------[ cut here ]------------
  kernel BUG at net/core/skbuff.c:109!
  Call Trace:
  skb_push+0x10/0x10
  ip6gre_header+0x47/0x1b0
  neigh_connected_output+0xae/0xf0

ip6gre tunnel provides its own header_ops->create, and sets it
conditionally when initializing the tunnel in NBMA mode. When
header_ops->create is used, dev->hard_header_len should reflect the
length of the header created. Otherwise, when not used,
dev->needed_headroom should be used.

Fixes: eb95f52fc72d ("net: ipv6_gre: Fix GRO to work on IPv6 over GRE tap")
Cc: Maria Pasechnik <mariap@mellanox.com>
Signed-off-by: Antoine Tenart <atenart@kernel.org>
---
 net/ipv6/ip6_gre.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 8cf659994412..c3bc89b6b1a1 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1133,8 +1133,13 @@ static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
 			return;
 
 		if (rt->dst.dev) {
-			dev->needed_headroom = rt->dst.dev->hard_header_len +
-					       t_hlen;
+			unsigned short dst_len = rt->dst.dev->hard_header_len +
+						 t_hlen;
+
+			if (t->dev->header_ops)
+				dev->hard_header_len = dst_len;
+			else
+				dev->needed_headroom = dst_len;
 
 			if (set_mtu) {
 				dev->mtu = rt->dst.dev->mtu - t_hlen;
@@ -1159,7 +1164,12 @@ static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
 
 	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
-	tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
+
+	if (tunnel->dev->header_ops)
+		tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
+	else
+		tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
+
 	return t_hlen;
 }
 
-- 
2.28.0

Re: [PATCH net] net: ip6_gre: set dev->hard_header_len when using header_ops

[Jakub Kicinski]

On Mon, 30 Nov 2020 17:19:11 +0100 Antoine Tenart wrote:
> syzkaller managed to crash the kernel using an NBMA ip6gre interface. I
> could reproduce it creating an NBMA ip6gre interface and forwarding
> traffic to it:
> 
>   skbuff: skb_under_panic: text:ffffffff8250e927 len:148 put:44 head:ffff8c03c7a33
>   ------------[ cut here ]------------
>   kernel BUG at net/core/skbuff.c:109!
>   Call Trace:
>   skb_push+0x10/0x10
>   ip6gre_header+0x47/0x1b0
>   neigh_connected_output+0xae/0xf0
> 
> ip6gre tunnel provides its own header_ops->create, and sets it
> conditionally when initializing the tunnel in NBMA mode. When
> header_ops->create is used, dev->hard_header_len should reflect the
> length of the header created. Otherwise, when not used,
> dev->needed_headroom should be used.
> 
> Fixes: eb95f52fc72d ("net: ipv6_gre: Fix GRO to work on IPv6 over GRE tap")
> Cc: Maria Pasechnik <mariap@mellanox.com>
> Signed-off-by: Antoine Tenart <atenart@kernel.org>

Applied, thank you!