redonkable/alistair23-linux
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alistair23-linux/net
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Yonghong Song 13acc94eff net: permit skb_segment on head_frag frag_list skb 
One of our in-house projects, bpf-based NAT, hits a kernel BUG_ON at
function skb_segment(), line 3667. The bpf program attaches to
clsact ingress, calls bpf_skb_change_proto to change protocol
from ipv4 to ipv6 or from ipv6 to ipv4, and then calls bpf_redirect
to send the changed packet out.

3472 struct sk_buff *skb_segment(struct sk_buff *head_skb,
3473                             netdev_features_t features)
3474 {
3475         struct sk_buff *segs = NULL;
3476         struct sk_buff *tail = NULL;
...
3665                 while (pos < offset + len) {
3666                         if (i >= nfrags) {
3667                                 BUG_ON(skb_headlen(list_skb));
3668
3669                                 i = 0;
3670                                 nfrags = skb_shinfo(list_skb)->nr_frags;
3671                                 frag = skb_shinfo(list_skb)->frags;
3672                                 frag_skb = list_skb;
...

call stack:
...
 #1 [ffff883ffef03558] __crash_kexec at ffffffff8110c525
 #2 [ffff883ffef03620] crash_kexec at ffffffff8110d5cc
 #3 [ffff883ffef03640] oops_end at ffffffff8101d7e7
 #4 [ffff883ffef03668] die at ffffffff8101deb2
 #5 [ffff883ffef03698] do_trap at ffffffff8101a700
 #6 [ffff883ffef036e8] do_error_trap at ffffffff8101abfe
 #7 [ffff883ffef037a0] do_invalid_op at ffffffff8101acd0
 #8 [ffff883ffef037b0] invalid_op at ffffffff81a00bab
    [exception RIP: skb_segment+3044]
    RIP: ffffffff817e4dd4  RSP: ffff883ffef03860  RFLAGS: 00010216
    RAX: 0000000000002bf6  RBX: ffff883feb7aaa00  RCX: 0000000000000011
    RDX: ffff883fb87910c0  RSI: 0000000000000011  RDI: ffff883feb7ab500
    RBP: ffff883ffef03928   R8: 0000000000002ce2   R9: 00000000000027da
    R10: 000001ea00000000  R11: 0000000000002d82  R12: ffff883f90a1ee80
    R13: ffff883fb8791120  R14: ffff883feb7abc00  R15: 0000000000002ce2
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff883ffef03930] tcp_gso_segment at ffffffff818713e7

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-25 16:46:04 -04:00
..
6lowpan
9p
802
8021q Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
appletalk
atm
ax25
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
bpf
bridge net: bridge: fix direct access to bridge vlan_enabled and use helper 2018-03-23 12:41:14 -04:00
caif net: Convert caif_net_ops 2018-03-05 10:48:27 -05:00
can net: Convert can_pernet_ops 2018-03-22 11:11:29 -04:00
ceph libceph, ceph: avoid memory leak when specifying same option several times 2018-02-26 16:19:30 +01:00
core net: permit skb_segment on head_frag frag_list skb 2018-03-25 16:46:04 -04:00
dcb
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
decnet
dns_resolver
dsa Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
ethernet
hsr
ieee802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
ife
ipv4 net: Convert udp_sysctl_ops 2018-03-23 13:00:46 -04:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
iucv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
kcm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
key net: Convert /proc creating and destroying pernet_operations 2018-02-27 11:01:35 -05:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
l3mdev
lapb
llc net: llc: drop VLA in llc_sap_mcast() 2018-03-12 11:14:06 -04:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
mac802154
mpls net: Convert mpls_net_ops 2018-03-17 17:07:39 -04:00
ncsi net/ncsi: unlock on error in ncsi_set_interface_nl() 2018-03-08 21:49:58 -05:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
netlabel
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
netrom
nfc
nsh
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
packet
phonet net: Convert /proc creating and destroying pernet_operations 2018-02-27 11:01:35 -05:00
psample
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
rds rds: tcp: remove register_netdevice_notifier infrastructure. 2018-03-22 11:21:45 -04:00
rfkill
rose
rxrpc net: Convert rxrpc_net_ops 2018-03-23 13:00:47 -04:00
sched net/sched: act_vlan: declare push_vid with host byte order 2018-03-23 21:54:07 -04:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
smc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
strparser
sunrpc
switchdev
tipc tipc: obtain node identity from interface by default 2018-03-23 13:12:18 -04:00
tls tls: RX path for ktls 2018-03-23 12:25:54 -04:00
unix
vmw_vsock
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
x25
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
compat.c
Kconfig
Makefile
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
sysctl_net.c