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* [syzbot] [net?] [bpf?] general protection fault in sk_psock_verdict_data_ready
@ 2023-06-01  8:17 syzbot
  0 siblings, 0 replies; only message in thread
From: syzbot @ 2023-06-01  8:17 UTC (permalink / raw)
  To: andrii, ast, bpf, daniel, davem, edumazet, jakub, john.fastabend,
	kuba, linux-kernel, netdev, pabeni, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    4781e965e655 net: phy: broadcom: Register dummy IRQ handler
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=117277de280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5335204dcdecfda
dashboard link: https://syzkaller.appspot.com/bug?extid=8252ac3e16614ea0ea04
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7a839a1e1e20/disk-4781e965.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ceb0a7674b18/vmlinux-4781e965.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f3e82748f103/bzImage-4781e965.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8252ac3e16614ea0ea04@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc000000005c: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000002e0-0x00000000000002e7]
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.4.0-rc3-syzkaller-00588-g4781e965e655 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023
RIP: 0010:sk_psock_verdict_data_ready+0x19f/0x3c0 net/core/skmsg.c:1213
Code: 4c 89 e6 e8 63 70 5e f9 4d 85 e4 75 75 e8 19 74 5e f9 48 8d bb e0 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 07 02 00 00 48 89 ef ff 93 e0 02 00 00 e8 29 fd
RSP: 0018:ffffc90000147688 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 000000000000005c RSI: ffffffff8825ceb7 RDI: 00000000000002e0
RBP: ffff888076518c40 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000008000 R15: ffff888076518c40
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f901375bab0 CR3: 000000004bf26000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tcp_data_ready+0x10a/0x520 net/ipv4/tcp_input.c:5006
 tcp_data_queue+0x25d3/0x4c50 net/ipv4/tcp_input.c:5080
 tcp_rcv_established+0x829/0x1f90 net/ipv4/tcp_input.c:6019
 tcp_v4_do_rcv+0x65a/0x9c0 net/ipv4/tcp_ipv4.c:1726
 tcp_v4_rcv+0x2cbf/0x3340 net/ipv4/tcp_ipv4.c:2148
 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2ec/0x520 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:303 [inline]
 NF_HOOK include/linux/netfilter.h:297 [inline]
 ip_local_deliver+0x1ae/0x200 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:468 [inline]
 ip_rcv_finish+0x1cf/0x2f0 net/ipv4/ip_input.c:449
 NF_HOOK include/linux/netfilter.h:303 [inline]
 NF_HOOK include/linux/netfilter.h:297 [inline]
 ip_rcv+0xae/0xd0 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
 process_backlog+0x101/0x670 net/core/dev.c:5933
 __napi_poll+0xb7/0x6f0 net/core/dev.c:6499
 napi_poll net/core/dev.c:6566 [inline]
 net_rx_action+0x8a9/0xcb0 net/core/dev.c:6699
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:939 [inline]
 run_ksoftirqd+0x31/0x60 kernel/softirq.c:931
 smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sk_psock_verdict_data_ready+0x19f/0x3c0 net/core/skmsg.c:1213
Code: 4c 89 e6 e8 63 70 5e f9 4d 85 e4 75 75 e8 19 74 5e f9 48 8d bb e0 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 07 02 00 00 48 89 ef ff 93 e0 02 00 00 e8 29 fd
RSP: 0018:ffffc90000147688 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 000000000000005c RSI: ffffffff8825ceb7 RDI: 00000000000002e0
RBP: ffff888076518c40 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000008000 R15: ffff888076518c40
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f901375bab0 CR3: 000000004bf26000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 89 e6             	mov    %r12,%rsi
   3:	e8 63 70 5e f9       	callq  0xf95e706b
   8:	4d 85 e4             	test   %r12,%r12
   b:	75 75                	jne    0x82
   d:	e8 19 74 5e f9       	callq  0xf95e742b
  12:	48 8d bb e0 02 00 00 	lea    0x2e0(%rbx),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 07 02 00 00    	jne    0x23b
  34:	48 89 ef             	mov    %rbp,%rdi
  37:	ff 93 e0 02 00 00    	callq  *0x2e0(%rbx)
  3d:	e8                   	.byte 0xe8
  3e:	29 fd                	sub    %edi,%ebp


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