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twx-linux/net/ipv4/netfilter
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Eric Dumazet 92ceba94de netfilter: nf_tables: prevent nf_skb_duplicated corruption 
syzbot found that nf_dup_ipv4() or nf_dup_ipv6() could write
per-cpu variable nf_skb_duplicated in an unsafe way [1].

Disabling preemption as hinted by the splat is not enough,
we have to disable soft interrupts as well.

[1]
BUG: using __this_cpu_write() in preemptible [00000000] code: syz.4.282/6316
 caller is nf_dup_ipv4+0x651/0x8f0 net/ipv4/netfilter/nf_dup_ipv4.c:87
CPU: 0 UID: 0 PID: 6316 Comm: syz.4.282 Not tainted 6.11.0-rc7-syzkaller-00104-g7052622fccb1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
  __dump_stack lib/dump_stack.c:93 [inline]
  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
  check_preemption_disabled+0x10e/0x120 lib/smp_processor_id.c:49
  nf_dup_ipv4+0x651/0x8f0 net/ipv4/netfilter/nf_dup_ipv4.c:87
  nft_dup_ipv4_eval+0x1db/0x300 net/ipv4/netfilter/nft_dup_ipv4.c:30
  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_ipv4+0x202/0x320 net/netfilter/nft_chain_filter.c:23
  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
  nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
  nf_hook+0x2c4/0x450 include/linux/netfilter.h:269
  NF_HOOK_COND include/linux/netfilter.h:302 [inline]
  ip_output+0x185/0x230 net/ipv4/ip_output.c:433
  ip_local_out net/ipv4/ip_output.c:129 [inline]
  ip_send_skb+0x74/0x100 net/ipv4/ip_output.c:1495
  udp_send_skb+0xacf/0x1650 net/ipv4/udp.c:981
  udp_sendmsg+0x1c21/0x2a60 net/ipv4/udp.c:1269
  sock_sendmsg_nosec net/socket.c:730 [inline]
  __sock_sendmsg+0x1a6/0x270 net/socket.c:745
  ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
  ___sys_sendmsg net/socket.c:2651 [inline]
  __sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
  __do_sys_sendmmsg net/socket.c:2766 [inline]
  __se_sys_sendmmsg net/socket.c:2763 [inline]
  __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
  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: 0033:0x7f4ce4f7def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4ce5d4a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f4ce5135f80 RCX: 00007f4ce4f7def9
RDX: 0000000000000001 RSI: 0000000020005d40 RDI: 0000000000000006
RBP: 00007f4ce4ff0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4ce5135f80 R15: 00007ffd4cbc6d68
 </TASK>

Fixes: d877f07112f1 ("netfilter: nf_tables: add nft_dup expression")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2024-09-27 13:55:46 +02:00
..
arp_tables.c netfilter: Use kmemdup_array instead of kmemdup for multiple allocation 2024-09-03 10:47:16 +02:00
arpt_mangle.c
arptable_filter.c netfilter: arp_tables: allow use of arpt_do_table as hookfn 2021-10-14 23:06:53 +02:00
ip_tables.c netfilter: Use kmemdup_array instead of kmemdup for multiple allocation 2024-09-03 10:47:16 +02:00
ipt_ah.c
ipt_ECN.c
ipt_REJECT.c
ipt_rpfilter.c netfilter: rpfilter: Unmask upper DSCP bits 2024-08-22 16:59:57 -07:00
ipt_SYNPROXY.c
iptable_filter.c netfilter: use NF_DROP instead of -NF_DROP 2024-05-06 16:29:21 +02:00
iptable_mangle.c netfilter: xt_mangle: only check verdict part of return value 2023-10-18 10:26:43 +02:00
iptable_nat.c netfilter: iptables: Fix null-ptr-deref in iptable_nat_table_init(). 2024-07-31 23:20:50 +02:00
iptable_raw.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
iptable_security.c netfilter: iptables: allow use of ipt_do_table as hookfn 2021-10-14 23:06:53 +02:00
Kconfig netfilter: arptables: Select NETFILTER_FAMILY_ARP when building arp_tables.c 2024-03-28 03:54:02 +01:00
Makefile netfilter: xtables: allow xtables-nft only builds 2024-01-29 15:43:21 +01:00
nf_defrag_ipv4.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nf_dup_ipv4.c netfilter: nf_tables: prevent nf_skb_duplicated corruption 2024-09-27 13:55:46 +02:00
nf_nat_h323.c netfilter: nat: move repetitive nat port reserve loop to a helper 2022-09-07 16:46:04 +02:00
nf_nat_pptp.c netfilter: conntrack: pptp: use single option structure 2022-02-04 06:30:28 +01:00
nf_nat_snmp_basic_main.c
nf_nat_snmp_basic.asn1 treewide: Add SPDX identifier to IETF ASN.1 modules 2023-10-27 18:04:28 +08:00
nf_reject_ipv4.c netfilter: nf_reject: Fix build warning when CONFIG_BRIDGE_NETFILTER=n 2024-09-26 13:03:02 +02:00
nf_socket_ipv4.c tcp: Access &tcp_hashinfo via net. 2022-09-20 10:21:49 -07:00
nf_tproxy_ipv4.c netfilter: tproxy: bail out if IP has been disabled on the device 2024-05-29 00:37:51 +02:00
nft_dup_ipv4.c netfilter: nf_tables: pass context structure to nft_parse_register_load 2024-08-20 12:37:24 +02:00
nft_fib_ipv4.c netfilter: nft_fib: Unmask upper DSCP bits 2024-08-22 16:59:57 -07:00
nft_reject_ipv4.c netfilter: nf_tables: do not reduce read-only expressions 2022-03-20 00:29:46 +01:00