syzbot


general protection fault in nf_tproxy_laddr4

Status: fixed on 2024/06/11 03:41
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+b94a6818504ea90d7661@syzkaller.appspotmail.com
Fix commit: 21a673bddc8f netfilter: tproxy: bail out if IP has been disabled on the device
First crash: 43d, last: 30d
Cause bisection: failed (error log, bisect log)
  
Discussions (5)
Title Replies (including bot) Last reply
[PATCH net 5/6] netfilter: tproxy: bail out if IP has been disabled on the device 1 (1) 2024/05/28 22:55
[PATCH net 5/6] netfilter: tproxy: bail out if IP has been disabled on the device 1 (1) 2024/05/23 16:20
[PATCH net 5/6] netfilter: tproxy: bail out if IP has been disabled on the device 1 (1) 2024/05/22 23:13
[PATCH nf] netfilter: tproxy: bail out if IP has been disabled on the device 1 (1) 2024/05/13 10:27
[syzbot] [netfilter?] general protection fault in nf_tproxy_laddr4 0 (2) 2024/05/13 10:04
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/05/13 10:04 26m fw@strlen.de git://git.kernel.org/pub/scm/linux/kernel/git/fwestphal/nf.git syz_b94a6818504ea90d7661 OK log

Sample crash report:
netlink: 'syz-executor314': attribute type 4 has an invalid length.
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 PID: 5086 Comm: syz-executor314 Not tainted 6.9.0-rc6-syzkaller-00157-g6e7ffa180a53 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:nf_tproxy_laddr4+0xb7/0x340 net/ipv4/netfilter/nf_tproxy_ipv4.c:62
Code: 89 c5 31 ff 89 c6 e8 08 80 8d f7 85 ed 0f 84 ab 01 00 00 e8 bb 7b 8d f7 eb 05 e8 b4 7b 8d f7 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 3a 26 f2 f7 48 8b 1b e8 72 df 77
RSP: 0018:ffffc9000344eb38 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88802a7ada00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8a0894f8 R09: 0000000000000001
R10: 0000000000000002 R11: ffff88802a7ada00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055556cd0a380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000221a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nft_tproxy_eval_v4 net/netfilter/nft_tproxy.c:56 [inline]
 nft_tproxy_eval+0xa9a/0x1a00 net/netfilter/nft_tproxy.c:168
 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_slow_list+0x1f8/0x460 net/netfilter/core.c:665
 NF_HOOK_LIST include/linux/netfilter.h:350 [inline]
 ip_sublist_rcv+0x9a4/0xab0 net/ipv4/ip_input.c:637
 ip_list_rcv+0x42b/0x480 net/ipv4/ip_input.c:674
 __netif_receive_skb_list_ptype net/core/dev.c:5587 [inline]
 __netif_receive_skb_list_core+0x95a/0x980 net/core/dev.c:5635
 __netif_receive_skb_list net/core/dev.c:5687 [inline]
 netif_receive_skb_list_internal+0xa51/0xe30 net/core/dev.c:5779
 netif_receive_skb_list+0x55/0x4b0 net/core/dev.c:5831
 xdp_recv_frames net/bpf/test_run.c:278 [inline]
 xdp_test_run_batch net/bpf/test_run.c:356 [inline]
 bpf_test_run_xdp_live+0x1973/0x1e90 net/bpf/test_run.c:384
 bpf_prog_test_run_xdp+0x813/0x11b0 net/bpf/test_run.c:1267
 bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4269
 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5678
 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5765
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcafe84c2b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffba9dffc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fcafe84c2b9
RDX: 0000000000000048 RSI: 0000000020000600 RDI: 000000000000000a
RBP: 0000000000000000 R08: 00007fffba9dfff0 R09: 00007fffba9dfff0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nf_tproxy_laddr4+0xb7/0x340 net/ipv4/netfilter/nf_tproxy_ipv4.c:62
Code: 89 c5 31 ff 89 c6 e8 08 80 8d f7 85 ed 0f 84 ab 01 00 00 e8 bb 7b 8d f7 eb 05 e8 b4 7b 8d f7 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 3a 26 f2 f7 48 8b 1b e8 72 df 77
RSP: 0018:ffffc9000344eb38 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88802a7ada00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8a0894f8 R09: 0000000000000001
R10: 0000000000000002 R11: ffff88802a7ada00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055556cd0a380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000221a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 c5                	mov    %eax,%ebp
   2:	31 ff                	xor    %edi,%edi
   4:	89 c6                	mov    %eax,%esi
   6:	e8 08 80 8d f7       	call   0xf78d8013
   b:	85 ed                	test   %ebp,%ebp
   d:	0f 84 ab 01 00 00    	je     0x1be
  13:	e8 bb 7b 8d f7       	call   0xf78d7bd3
  18:	eb 05                	jmp    0x1f
  1a:	e8 b4 7b 8d f7       	call   0xf78d7bd3
  1f:	48 83 c3 18          	add    $0x18,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 3a 26 f2 f7       	call   0xf7f22673
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	e8                   	.byte 0xe8
  3d:	72 df                	jb     0x1e
  3f:	77                   	.byte 0x77

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/10 01:57 net 6e7ffa180a53 de979bc2 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in nf_tproxy_laddr4
2024/05/22 16:19 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fda5695d692c 4d098039 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in nf_tproxy_laddr4
2024/05/09 22:37 net 6e7ffa180a53 de979bc2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in nf_tproxy_laddr4
2024/05/09 22:25 net-next 628bc3e5a1be de979bc2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in nf_tproxy_laddr4
2024/05/09 22:25 net-next 628bc3e5a1be de979bc2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in nf_tproxy_laddr4
* Struck through repros no longer work on HEAD.