linux-kernel - BUG: general protection fault in check

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Message-ID: <CALAgD-5hheRoik1vz49AxFSQ49uQ3eR0D=Mo=tWbrqKBkMD=WQ@mail.gmail.com>
Date: Sat, 24 Aug 2024 21:31:03 -0700
From: Xingyu Li <xli399@....edu>
To: tj@...nel.org, jiangshanlai@...il.com, linux-kernel@...r.kernel.org
Subject: BUG: general protection fault in check_lifetime

Hi,

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

Bug report:

Oops: general protection fault, probably for non-canonical address
0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.10.0 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Workqueue: events_power_efficient check_lifetime
RIP: 0010:check_lifetime+0x6ae/0x960
Code: 01 48 c7 c7 60 86 74 8c be 06 03 00 00 48 c7 c2 20 6f 74 8c e8
33 c0 f8 f7 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c
08 00 74 08 4c 89 ef e8 04 a4 7d f8 49 8b 5d 00 48 85 db 0f
RSP: 0018:ffffc900000cfb70 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff88db7a02 R09: 1ffffffff1dabe05
R10: dffffc0000000000 R11: fffffbfff1dabe06 R12: ffff88803bdcbe00
R13: 0000000000000018 R14: ffff88803bdcbe18 R15: 1ffff110077b97c3
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4bbd251460 CR3: 0000000030dc8000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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:check_lifetime+0x6ae/0x960
Code: 01 48 c7 c7 60 86 74 8c be 06 03 00 00 48 c7 c2 20 6f 74 8c e8
33 c0 f8 f7 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c
08 00 74 08 4c 89 ef e8 04 a4 7d f8 49 8b 5d 00 48 85 db 0f
RSP: 0018:ffffc900000cfb70 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff88db7a02 R09: 1ffffffff1dabe05
R10: dffffc0000000000 R11: fffffbfff1dabe06 R12: ffff88803bdcbe00
R13: 0000000000000018 R14: ffff88803bdcbe18 R15: 1ffff110077b97c3
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4bbd2ad850 CR3: 0000000030dc8000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0: 48 c7 c7 60 86 74 8c mov    $0xffffffff8c748660,%rdi
   7: be 06 03 00 00       mov    $0x306,%esi
   c: 48 c7 c2 20 6f 74 8c mov    $0xffffffff8c746f20,%rdx
  13: e8 33 c0 f8 f7       call   0xf7f8c04b
  18: 4c 89 e8             mov    %r13,%rax
  1b: 48 c1 e8 03           shr    $0x3,%rax
  1f: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
  26: fc ff df
* 29: 80 3c 08 00           cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2d: 74 08                 je     0x37
  2f: 4c 89 ef             mov    %r13,%rdi
  32: e8 04 a4 7d f8       call   0xf87da43b
  37: 49 8b 5d 00           mov    0x0(%r13),%rbx
  3b: 48 85 db             test   %rbx,%rbx
  3e: 0f                   .byte 0xf


-- 
Yours sincerely,
Xingyu