linux-kernel - BUG: general protection fault in arpt_do

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Message-ID: <CALAgD-7HBA_wLo-7WOFh=xB1HMBfACabb-6WbgkC905xbE76Jg@mail.gmail.com>
Date: Wed, 28 Aug 2024 17:04:44 -0700
From: Xingyu Li <xli399@....edu>
To: pablo@...filter.org, kadlec@...filter.org, davem@...emloft.net, 
	dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	netfilter-devel@...r.kernel.org, coreteam@...filter.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Yu Hao <yhao016@....edu>
Subject: BUG: general protection fault in arpt_do_table

Hi,

We found a bug in Linux 6.10 using syzkaller. It is possibly a null
pointer dereference  bug.
The bug report is as follows, but unfortunately there is no generated
syzkaller reproducer.

Bug report:

Oops: general protection fault, probably for non-canonical address
0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 0 PID: 2893 Comm: kworker/u4:9 Not tainted 6.10.0 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Workqueue: bat_events batadv_bla_periodic_work
RIP: 0010:arpt_do_table+0x2a8/0x1dc0 net/ipv4/netfilter/arp_tables.c:210
Code: 28 00 74 08 48 89 df e8 26 b3 69 f8 48 8b 1b e8 de f9 6c 01 41
89 c6 48 89 9c 24 88 00 00 00 4c 8d 7b 38 4c 89 f8 48 c1 e8 03 <42> 80
3c 28 00 74 08 4c 89 ff e8 f9 b2 69 f8 44 89 f3 48 c1 e3 03
RSP: 0000:ffffc900000076c0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff8c7668e0
RDX: 0000000080000101 RSI: ffffffff8ba956c0 RDI: ffffffff8ba95680
RBP: ffffc900000078a8 R08: ffffffff898aa86c R09: 0000000000000000
R10: ffffc90000007820 R11: ffffffff898aa6d0 R12: ffffc90000007960
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000038
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb61bfff40 CR3: 000000000d932000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc0/0x210 net/netfilter/core.c:626
 nf_hook+0x2be/0x450 include/linux/netfilter.h:269
 NF_HOOK include/linux/netfilter.h:312 [inline]
 arp_rcv+0x304/0x500 net/ipv4/arp.c:989
 __netif_receive_skb_one_core net/core/dev.c:5625 [inline]
 __netif_receive_skb+0x2cf/0x640 net/core/dev.c:5739
 process_backlog+0x37d/0x7a0 net/core/dev.c:6068
 __napi_poll+0xcc/0x480 net/core/dev.c:6722
 napi_poll net/core/dev.c:6791 [inline]
 net_rx_action+0x7ed/0x1040 net/core/dev.c:6907
 handle_softirqs+0x272/0x750 kernel/softirq.c:554
 do_softirq+0x117/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1b0/0x1f0 kernel/softirq.c:382
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 netif_rx+0x7f/0x90 net/core/dev.c:5210
 batadv_bla_send_claim+0x827/0xc60 net/batman-adv/bridge_loop_avoidance.c:447
 batadv_bla_send_announce net/batman-adv/bridge_loop_avoidance.c:675 [inline]
 batadv_bla_periodic_work+0x598/0xa80
net/batman-adv/bridge_loop_avoidance.c:1481
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0x977/0x1410 kernel/workqueue.c:3329
 worker_thread+0xaa0/0x1020 kernel/workqueue.c:3409
 kthread+0x2eb/0x380 kernel/kthread.c:389
 ret_from_fork+0x49/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:arpt_do_table+0x2a8/0x1dc0 net/ipv4/netfilter/arp_tables.c:210
Code: 28 00 74 08 48 89 df e8 26 b3 69 f8 48 8b 1b e8 de f9 6c 01 41
89 c6 48 89 9c 24 88 00 00 00 4c 8d 7b 38 4c 89 f8 48 c1 e8 03 <42> 80
3c 28 00 74 08 4c 89 ff e8 f9 b2 69 f8 44 89 f3 48 c1 e3 03
RSP: 0000:ffffc900000076c0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff8c7668e0
RDX: 0000000080000101 RSI: ffffffff8ba956c0 RDI: ffffffff8ba95680
RBP: ffffc900000078a8 R08: ffffffff898aa86c R09: 0000000000000000
R10: ffffc90000007820 R11: ffffffff898aa6d0 R12: ffffc90000007960
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000038
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb61bfff40 CR3: 000000000d932000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0: 28 00                 sub    %al,(%rax)
   2: 74 08                 je     0xc
   4: 48 89 df             mov    %rbx,%rdi
   7: e8 26 b3 69 f8       call   0xf869b332
   c: 48 8b 1b             mov    (%rbx),%rbx
   f: e8 de f9 6c 01       call   0x16cf9f2
  14: 41 89 c6             mov    %eax,%r14d
  17: 48 89 9c 24 88 00 00 mov    %rbx,0x88(%rsp)
  1e: 00
  1f: 4c 8d 7b 38           lea    0x38(%rbx),%r15
  23: 4c 89 f8             mov    %r15,%rax
  26: 48 c1 e8 03           shr    $0x3,%rax
* 2a: 42 80 3c 28 00       cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f: 74 08                 je     0x39
  31: 4c 89 ff             mov    %r15,%rdi
  34: e8 f9 b2 69 f8       call   0xf869b332
  39: 44 89 f3             mov    %r14d,%ebx
  3c: 48 c1 e3 03           shl    $0x3,%rbx


-- 
Yours sincerely,
Xingyu