syzbot


general protection fault in can_rx_register
Status: upstream: reported C repro on 2020/01/17 13:46
Reported-by: syzbot+c3ea30e1e2485573f953@syzkaller.appspotmail.com
First crash: 860d, last: 15h23m

Cause bisection: introduced by (bisect log) :
commit 9868b5d44f3df9dd75247acd23dddff0a42f79be
Author: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Date: Mon Oct 8 09:48:33 2018 +0000

  can: introduce CAN_REQUIRED_SIZE macro

Crash: general protection fault in can_rx_register (log)
Repro: C syz .config

Fix bisection: failed (bisect log)
Patch testing requests:
Created Duration User Patch Repo Result
2020/10/18 20:58 19m anmol.karan123@gmail.com patch upstream OK
2020/10/02 11:07 10m anmol.karan123@gmail.com upstream report log

Sample crash report:
8021q: adding VLAN 0 to HW filter on device bond1
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 3601 Comm: syz-executor282 Not tainted 5.18.0-rc6-syzkaller-00009-gfeb9c5e19e91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:hlist_add_head_rcu include/linux/rculist.h:587 [inline]
RIP: 0010:can_rx_register+0x365/0x6a0 net/can/af_can.c:477
Code: ee 03 49 89 4f 30 80 3c 16 00 0f 85 e3 02 00 00 48 8b 4c 24 18 48 89 c6 48 ba 00 00 00 00 00 fc ff df 48 c1 ee 03 49 89 4f 38 <80> 3c 16 00 0f 85 aa 02 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffffc90002f1fc10 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000000 RCX: ffff888016bd1000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888073ea36c8
RBP: ffff888025d806c0 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff8843ead9 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff920005e3f87 R14: ffffffff90947848 R15: ffff888073ea3690
FS:  00007faec7193700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056055aa6372e CR3: 0000000018de7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 raw_enable_filters+0xe2/0x200 net/can/raw.c:193
 raw_enable_allfilters+0x82/0x290 net/can/raw.c:259
 raw_bind+0x2ba/0xb50 net/can/raw.c:455
 __sys_bind+0x1e9/0x250 net/socket.c:1697
 __do_sys_bind net/socket.c:1708 [inline]
 __se_sys_bind net/socket.c:1706 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1706
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7faec71e1d79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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:00007faec7193318 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007faec7269428 RCX: 00007faec71e1d79
RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007faec7269420 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000001d R11: 0000000000000246 R12: 00007faec7237064
R13: 00007fff2986b93f R14: 00007faec7193400 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hlist_add_head_rcu include/linux/rculist.h:587 [inline]
RIP: 0010:can_rx_register+0x365/0x6a0 net/can/af_can.c:477
Code: ee 03 49 89 4f 30 80 3c 16 00 0f 85 e3 02 00 00 48 8b 4c 24 18 48 89 c6 48 ba 00 00 00 00 00 fc ff df 48 c1 ee 03 49 89 4f 38 <80> 3c 16 00 0f 85 aa 02 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffffc90002f1fc10 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000000 RCX: ffff888016bd1000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888073ea36c8
RBP: ffff888025d806c0 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff8843ead9 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff920005e3f87 R14: ffffffff90947848 R15: ffff888073ea3690
FS:  00007faec7193700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056055aa6372e CR3: 0000000018de7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ee                   	out    %al,(%dx)
   1:	03 49 89             	add    -0x77(%rcx),%ecx
   4:	4f 30 80 3c 16 00 0f 	rex.WRXB xor %r8b,0xf00163c(%r8)
   b:	85 e3                	test   %esp,%ebx
   d:	02 00                	add    (%rax),%al
   f:	00 48 8b             	add    %cl,-0x75(%rax)
  12:	4c 24 18             	rex.WR and $0x18,%al
  15:	48 89 c6             	mov    %rax,%rsi
  18:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  1f:	fc ff df
  22:	48 c1 ee 03          	shr    $0x3,%rsi
  26:	49 89 4f 38          	mov    %rcx,0x38(%r15)
* 2a:	80 3c 16 00          	cmpb   $0x0,(%rsi,%rdx,1) <-- trapping instruction
  2e:	0f 85 aa 02 00 00    	jne    0x2de
  34:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  3b:	fc ff df
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Crashes (14):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/05/12 11:10 upstream feb9c5e19e91 beb0b407 .config log report syz C general protection fault in can_rx_register
ci-upstream-net-this-kasan-gce 2022/05/12 13:06 net a48ab883c4a9 beb0b407 .config log report syz C general protection fault in can_rx_register
ci-upstream-kasan-gce-selinux-root 2020/01/17 11:35 upstream f4353c3e2aaf 3de7aabb .config log report syz C
ci-upstream-kasan-gce-smack-root 2020/01/17 05:11 upstream f5ae2ea6347a 3de7aabb .config log report syz C
ci-upstream-kasan-gce 2020/01/17 03:01 upstream f5ae2ea6347a 3de7aabb .config log report syz C
ci-upstream-net-this-kasan-gce 2020/01/17 04:09 net 567110f147b3 3de7aabb .config log report syz C
ci-upstream-net-kasan-gce 2020/01/17 03:57 net-next 1ccf6c13d9c7 3de7aabb .config log report syz
ci-upstream-kasan-gce-selinux-root 2022/05/12 05:05 upstream feb9c5e19e91 beb0b407 .config log report info general protection fault in can_rx_register
ci-qemu-upstream-386 2022/05/25 23:37 upstream fdaf9a5840ac 3037caa9 .config log report info general protection fault in can_rx_register
ci-upstream-kasan-gce-smack-root 2020/04/20 19:31 upstream ae83d0b416db 347a5dc3 .config log report
ci-upstream-kasan-gce 2020/01/17 01:21 upstream f5ae2ea6347a 3de7aabb .config log report
ci-upstream-kasan-gce-386 2020/09/29 23:43 upstream ccc1d052eff9 5abc3f1a .config log report info
ci-upstream-net-this-kasan-gce 2020/04/17 08:05 net 2fcd80144b93 18397578 .config log report
ci-upstream-net-this-kasan-gce 2020/04/16 00:33 net 91fac45cd006 3f3c5574 .config log report