Re: [syzbot] [kernel?] general protection fault in netdev_register_kobject

[syzbot]

> On Thu, Aug 31, 2023 at 12:05:53AM -0700, syzbot wrote:
>> Hello,
>> 
>> syzbot found the following issue on:
>> 
>> HEAD commit:    2ee82481c392 Add linux-next specific files for 20230828
>> git tree:       linux-next
>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=16ea87b7a80000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=e82a7781f9208c0d
>> dashboard link: https://syzkaller.appspot.com/bug?extid=d2c31705e468a347e6db
>> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=141c0267a80000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1585c0c0680000
>> 
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/30801702ce78/disk-2ee82481.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/8d9b67709145/vmlinux-2ee82481.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/47f8ef9bffd0/bzImage-2ee82481.xz
>> 
>> The issue was bisected to:
>> 
>> commit d21fdd07cea418c0d98c8a15fc95b8b8970801e7
>> Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
>> Date:   Thu Aug 17 09:12:21 2023 +0000
>> 
>>     driver core: Return proper error code when dev_set_name() fails
>> 
>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16cefca8680000
>> final oops:     https://syzkaller.appspot.com/x/report.txt?x=15cefca8680000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=11cefca8680000
>> 
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+d2c31705e468a347e6db@xxxxxxxxxxxxxxxxxxxxxxxxx
>> Fixes: d21fdd07cea4 ("driver core: Return proper error code when dev_set_name() fails")
>> 
>> RBP: 0000000000000002 R08: 00007ffd497ebaf6 R09: 0000000100000000
>> R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
>> R13: 00000000000f4240 R14: 00000000000162a9 R15: 00007ffd497ebd74
>>  </TASK>
>> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
>> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
>> CPU: 0 PID: 5057 Comm: syz-executor401 Not tainted 6.5.0-next-20230828-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
>> RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329
>> Code: a3 ac f7 48 8b 74 24 08 48 8b 14 24 eb 89 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 51 0f b6 07 89
>> RSP: 0018:ffffc90003abf058 EFLAGS: 00010282
>> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
>> RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
>> RBP: ffffc90003abf0e8 R08: 0000000000000001 R09: 0000000000000000
>> R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003abf0e8
>> R13: 0000000000000cc0 R14: ffff8880142f8880 R15: 0000000000000001
>> FS:  0000555555e44380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00007f8bf2d75fc4 CR3: 000000007211d000 CR4: 00000000003506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>>  <TASK>
>>  kvasprintf_const+0x25/0x190 lib/kasprintf.c:45
>>  kobject_set_name_vargs+0x5a/0x130 lib/kobject.c:272
>>  kobject_add_varg lib/kobject.c:366 [inline]
>>  kobject_add+0x12a/0x240 lib/kobject.c:424
>>  device_add+0x290/0x1ac0 drivers/base/core.c:3560
>>  netdev_register_kobject+0x183/0x3f0 net/core/net-sysfs.c:2044
>>  register_netdevice+0xbcb/0x1490 net/core/dev.c:10133
>>  macvlan_common_newlink+0x1102/0x1a40 drivers/net/macvlan.c:1545
>>  rtnl_newlink_create net/core/rtnetlink.c:3485 [inline]
>>  __rtnl_newlink+0x1177/0x1940 net/core/rtnetlink.c:3705
>>  rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3718
>>  rtnetlink_rcv_msg+0x439/0xd30 net/core/rtnetlink.c:6444
>>  netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545
>>  netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
>>  netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368
>>  netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910
>>  sock_sendmsg_nosec net/socket.c:730 [inline]
>>  sock_sendmsg+0xd9/0x180 net/socket.c:753
>>  ____sys_sendmsg+0x6ac/0x940 net/socket.c:2540
>>  ___sys_sendmsg+0x135/0x1d0 net/socket.c:2594
>>  __sys_sendmsg+0x117/0x1e0 net/socket.c:2623
>>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>>  do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
>>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
>> RIP: 0033:0x7f8bf2d14ce9
>> 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:00007ffd497ebd58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
>> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8bf2d14ce9
>> RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003
>> RBP: 0000000000000002 R08: 00007ffd497ebaf6 R09: 0000000100000000
>> R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
>> R13: 00000000000f4240 R14: 00000000000162a9 R15: 00007ffd497ebd74
>>  </TASK>
>> Modules linked in:
>> ---[ end trace 0000000000000000 ]---
>> RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329
>> Code: a3 ac f7 48 8b 74 24 08 48 8b 14 24 eb 89 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 51 0f b6 07 89
>> RSP: 0018:ffffc90003abf058 EFLAGS: 00010282
>> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
>> RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
>> RBP: ffffc90003abf0e8 R08: 0000000000000001 R09: 0000000000000000
>> R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003abf0e8
>> R13: 0000000000000cc0 R14: ffff8880142f8880 R15: 0000000000000001
>> FS:  0000555555e44380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00005628e3c36050 CR3: 000000007211d000 CR4: 00000000003506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> ----------------
>> Code disassembly (best guess):
>>    0:	a3 ac f7 48 8b 74 24 	movabs %eax,0x480824748b48f7ac
>>    7:	08 48
>>    9:	8b 14 24             	mov    (%rsp),%edx
>>    c:	eb 89                	jmp    0xffffff97
>>    e:	90                   	nop
>>    f:	f3 0f 1e fa          	endbr64
>>   13:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
>>   1a:	fc ff df
>>   1d:	48 89 fa             	mov    %rdi,%rdx
>>   20:	55                   	push   %rbp
>>   21:	48 c1 ea 03          	shr    $0x3,%rdx
>>   25:	53                   	push   %rbx
>>   26:	48 83 ec 10          	sub    $0x10,%rsp
>> * 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
>>   2e:	48 89 fa             	mov    %rdi,%rdx
>>   31:	83 e2 07             	and    $0x7,%edx
>>   34:	38 d0                	cmp    %dl,%al
>>   36:	7f 04                	jg     0x3c
>>   38:	84 c0                	test   %al,%al
>>   3a:	75 51                	jne    0x8d
>>   3c:	0f b6 07             	movzbl (%rdi),%eax
>>   3f:	89                   	.byte 0x89
>> 
>> 
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>> 
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>> 
>> If the bug is already fixed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>> 
>> If you want syzbot to run the reproducer, reply with:
>> #syz test: git://repo/address.git branch-or-commit-hash
>> If you attach or paste a git patch, syzbot will apply it before testing.
>> 
>> If you want to overwrite bug's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>> 
>> If the bug is a duplicate of another bug, reply with:
>> #syz dup: exact-subject-of-another-report
>
> #syz dup: [syzbot] [kernel?] general protection fault in nfc_register_device

can't find the dup bug

>
>> If you want to undo deduplication, reply with:
>> #syz undup
>
> -- 
> With Best Regards,
> Andy Shevchenko
>
>