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Eric Dumazet 4ed234fe79 netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6() 
I got a syzbot report without a repro [1] crashing in nf_send_reset6()

I think the issue is that dev->hard_header_len is zero, and we attempt
later to push an Ethernet header.

Use LL_MAX_HEADER, as other functions in net/ipv6/netfilter/nf_reject_ipv6.c.

[1]

skbuff: skb_under_panic: text:ffffffff89b1d008 len:74 put:14 head:ffff88803123aa00 data:ffff88803123a9f2 tail:0x3c end:0x140 dev:syz_tun
 kernel BUG at net/core/skbuff.c:206 !
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 7373 Comm: syz.1.568 Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
 RIP: 0010:skb_panic net/core/skbuff.c:206 [inline]
 RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216
Code: 0d 8d 48 c7 c6 60 a6 29 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 ba 30 38 02 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc900045269b0 EFLAGS: 00010282
RAX: 0000000000000088 RBX: dffffc0000000000 RCX: cd66dacdc5d8e800
RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffff88802d39a3d0 R08: ffffffff8174afec R09: 1ffff920008a4ccc
R10: dffffc0000000000 R11: fffff520008a4ccd R12: 0000000000000140
R13: ffff88803123aa00 R14: ffff88803123a9f2 R15: 000000000000003c
FS:  00007fdbee5ff6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005d322000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
  skb_push+0xe5/0x100 net/core/skbuff.c:2636
  eth_header+0x38/0x1f0 net/ethernet/eth.c:83
  dev_hard_header include/linux/netdevice.h:3208 [inline]
  nf_send_reset6+0xce6/0x1270 net/ipv6/netfilter/nf_reject_ipv6.c:358
  nft_reject_inet_eval+0x3b9/0x690 net/netfilter/nft_reject_inet.c:48
  expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
  nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288
  nft_do_chain_inet+0x418/0x6b0 net/netfilter/nft_chain_filter.c:161
  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
  nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
  nf_hook include/linux/netfilter.h:269 [inline]
  NF_HOOK include/linux/netfilter.h:312 [inline]
  br_nf_pre_routing_ipv6+0x63e/0x770 net/bridge/br_netfilter_ipv6.c:184
  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
  nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
  br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424
  __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5562
  __netif_receive_skb_one_core net/core/dev.c:5666 [inline]
  __netif_receive_skb+0x12f/0x650 net/core/dev.c:5781
  netif_receive_skb_internal net/core/dev.c:5867 [inline]
  netif_receive_skb+0x1e8/0x890 net/core/dev.c:5926
  tun_rx_batched+0x1b7/0x8f0 drivers/net/tun.c:1550
  tun_get_user+0x3056/0x47e0 drivers/net/tun.c:2007
  tun_chr_write_iter+0x10d/0x1f0 drivers/net/tun.c:2053
  new_sync_write fs/read_write.c:590 [inline]
  vfs_write+0xa6d/0xc90 fs/read_write.c:683
  ksys_write+0x183/0x2b0 fs/read_write.c:736
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbeeb7d1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007fdbee5ff000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdbeed36058 RCX: 00007fdbeeb7d1ff
RDX: 000000000000008e RSI: 0000000020000040 RDI: 00000000000000c8
RBP: 00007fdbeebf12be R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000008e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdbeed36058 R15: 00007ffc38de06e8
 </TASK>

Fixes: c8d7b98bec ("netfilter: move nf_send_resetX() code to nf_reject_ipvX modules")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2024-10-30 13:17:36 +01:00
..
ila ila: call nf_unregister_net_hooks() sooner 2024-09-05 14:57:12 -07:00
netfilter netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6() 2024-10-30 13:17:36 +01:00
addrconf.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
addrconf_core.c
addrlabel.c
af_inet6.c tcp: add SO_PEEK_OFF socket option tor TCPv6 2024-08-29 13:00:36 -07:00
ah6.c
anycast.c
calipso.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
datagram.c
esp6.c net: support non paged skb frags 2024-09-11 20:44:31 -07:00
esp6_offload.c
exthdrs.c
exthdrs_core.c
exthdrs_offload.c
fib6_notifier.c
fib6_rules.c ipv6: fib_rules: Add DSCP selector support 2024-09-13 21:15:45 -07:00
fou6.c
icmp.c icmp: move icmp_global.credit and icmp_global.stamp to per netns storage 2024-08-30 11:14:06 -07:00
inet6_connection_sock.c
inet6_hashtables.c inet6: constify 'struct net' parameter of various lookup helpers 2024-08-05 16:27:26 -07:00
ioam6.c
ioam6_iptunnel.c ioam6: improve checks on user data 2024-09-03 11:38:32 -07:00
ip6_checksum.c
ip6_fib.c
ip6_flowlabel.c
ip6_gre.c netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local 2024-09-03 11:36:43 +02:00
ip6_icmp.c
ip6_input.c net/ipv6: make use of the helper macro LIST_HEAD() 2024-09-06 18:10:21 -07:00
ip6_offload.c
ip6_offload.h
ip6_output.c ipv6: prevent possible UAF in ip6_xmit() 2024-08-21 17:35:49 -07:00
ip6_tunnel.c ip6_tunnel: Unmask upper DSCP bits in ip4ip6_err() 2024-09-04 16:57:11 -07:00
ip6_udp_tunnel.c
ip6_vti.c
ip6mr.c netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local 2024-09-03 11:36:43 +02:00
ipcomp6.c
ipv6_sockglue.c ipv6: avoid indirect calls for SOL_IP socket options 2024-08-26 14:53:50 -07:00
Kconfig net: ipv6: select DST_CACHE from IPV6_RPL_LWTUNNEL 2024-09-22 19:52:07 +01:00
Makefile
mcast.c ipv6: mcast: use min() to simplify the code 2024-08-26 09:48:53 -07:00
mcast_snoop.c
mip6.c
ndisc.c net/ipv6: replace deprecated strcpy with strscpy 2024-08-29 12:33:07 -07:00
netfilter.c
output_core.c
ping.c
proc.c minmax: add a few more MIN_T/MAX_T users 2024-07-28 13:41:14 -07:00
protocol.c
raw.c
reassembly.c
route.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-09-15 09:13:19 -07:00
rpl.c
rpl_iptunnel.c net: ipv6: rpl_iptunnel: Fix memory leak in rpl_input 2024-09-13 19:55:49 -07:00
seg6.c
seg6_hmac.c
seg6_iptunnel.c
seg6_local.c
sit.c ipv6: sit: Unmask upper DSCP bits in ipip6_tunnel_bind_dev() 2024-09-04 16:57:11 -07:00
syncookies.c
sysctl_net_ipv6.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
tcp_ao.c
tcp_ipv6.c tcp: annotate data-races around tcptw->tw_rcv_nxt 2024-08-28 17:08:17 -07:00
tcpv6_offload.c net: gso: fix tcp fraglist segmentation after pull from frag_list 2024-10-02 17:21:47 -07:00
tunnel6.c
udp.c udp: Compute L4 checksum as usual when not segmenting the skb 2024-10-15 18:12:33 -07:00
udp_impl.h
udp_offload.c
udplite.c
xfrm6_input.c
xfrm6_output.c
xfrm6_policy.c xfrm: respect ip protocols rules criteria when performing dst lookups 2024-09-23 07:02:07 +02:00
xfrm6_protocol.c
xfrm6_state.c
xfrm6_tunnel.c