[syzbot] [kernel?] general protection fault in serio_handle_event

* [syzbot] [kernel?] general protection fault in serio_handle_event
@ 2023-09-08  8:46 syzbot
  2023-10-20  1:21   ` syzbot
  0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2023-09-08  8:46 UTC (permalink / raw)
  To: andriy.shevchenko, gregkh, linux-kernel, rafael, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    db906f0ca6bb Merge tag 'phy-for-6.6' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11f66447a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3bd57a1ac08277b0
dashboard link: https://syzkaller.appspot.com/bug?extid=bbc59256015533127d80
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=138b9848680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1537ea00680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3c57e6e58eb2/disk-db906f0c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f999d9f3cd94/vmlinux-db906f0c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d9c5e553ff2/bzImage-db906f0c.xz

The issue was bisected to:

commit d21fdd07cea418c0d98c8a15fc95b8b8970801e7
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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=122032f0680000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=112032f0680000
console output: https://syzkaller.appspot.com/x/log.txt?x=162032f0680000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bbc59256015533127d80@syzkaller.appspotmail.com
Fixes: d21fdd07cea4 ("driver core: Return proper error code when dev_set_name() fails")

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: 774 Comm: kworker/0:2 Not tainted 6.5.0-syzkaller-11275-gdb906f0ca6bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: events_long serio_handle_event
RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329
Code: 01 ae 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:ffffc90003ccfa58 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90003ccfae8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003ccfae8
R13: 0000000000000cc0 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7335610882 CR3: 000000006e989000 CR4: 0000000000350ef0
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
 serio_add_port drivers/input/serio/serio.c:539 [inline]
 serio_handle_event+0x63b/0xa90 drivers/input/serio/serio.c:207
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329
Code: 01 ae 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:ffffc90003ccfa58 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90003ccfae8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003ccfae8
R13: 0000000000000cc0 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f733558f000 CR3: 0000000078402000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	01 ae f7 48 8b 74    	add    %ebp,0x748b48f7(%rsi)
   6:	24 08                	and    $0x8,%al
   8:	48 8b 14 24          	mov    (%rsp),%rdx
   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

---
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