linux-kernel - BUG: general protection fault in __free

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Message-ID: <CALAgD-7TsMdA7rjxfpheXc=MNqikEXY9TZNxJt4z9vm6Yfs5qQ@mail.gmail.com>
Date: Wed, 28 Aug 2024 16:27:36 -0700
From: Xingyu Li <xli399@....edu>
To: tglx@...utronix.de, akpm@...ux-foundation.org, 
	linux-kernel@...r.kernel.org
Cc: Yu Hao <yhao016@....edu>
Subject: BUG: general protection fault in __free_object

Hi,

We found a bug in Linux 6.10 using syzkaller. It is possibly a null
pointer dereference  bug.
The reproducer is
https://gist.github.com/freexxxyyy/5aefd53c6567415e9fe8c76cc2ad390c

The bug report is:

Syzkaller hit 'general protection fault in __free_object' bug.

Oops: general protection fault, probably for non-canonical address
0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.10.0 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Workqueue: events kfree_rcu_work
RIP: 0010:hlist_add_head include/linux/list.h:1032 [inline]
RIP: 0010:__free_object+0x903/0xaa0 lib/debugobjects.c:396
Code: 24 18 48 8b 7c 24 38 74 05 e8 89 bf 95 fd 48 8b 44 24 28 49 89
45 08 eb 03 45 31 ed 48 8b 1d 34 95 61 0e 4c 89 e8 48 c1 e8 03 <42> 80
3c 30 00 74 08 4c 89 ef e8 5e bf 95 fd 49 89 5d 00 48 85 db
RSP: 0018:ffffc900000af740 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888028f56cb0 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff888028f56cb8
RBP: ffffc900000af920 R08: 0000000000000003 R09: fffff52000015ed8
R10: dffffc0000000000 R11: fffff52000015ed8 R12: ffffffff92c03280
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555787e6868 CR3: 000000000d932000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:994 [inline]
 debug_check_no_obj_freed+0x135/0x530 lib/debugobjects.c:1019
 slab_free_hook mm/slub.c:2163 [inline]
 slab_free_freelist_hook mm/slub.c:2225 [inline]
 slab_free_bulk mm/slub.c:4462 [inline]
 kmem_cache_free_bulk+0x1bf/0x360 mm/slub.c:4676
 kfree_bulk include/linux/slab.h:568 [inline]
 kvfree_rcu_bulk+0x249/0x4d0 kernel/rcu/tree.c:3371
 kfree_rcu_work+0x443/0x500 kernel/rcu/tree.c:3450
 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:hlist_add_head include/linux/list.h:1032 [inline]
RIP: 0010:__free_object+0x903/0xaa0 lib/debugobjects.c:396
Code: 24 18 48 8b 7c 24 38 74 05 e8 89 bf 95 fd 48 8b 44 24 28 49 89
45 08 eb 03 45 31 ed 48 8b 1d 34 95 61 0e 4c 89 e8 48 c1 e8 03 <42> 80
3c 30 00 74 08 4c 89 ef e8 5e bf 95 fd 49 89 5d 00 48 85 db
RSP: 0018:ffffc900000af740 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888028f56cb0 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff888028f56cb8
RBP: ffffc900000af920 R08: 0000000000000003 R09: fffff52000015ed8
R10: dffffc0000000000 R11: fffff52000015ed8 R12: ffffffff92c03280
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555787e6868 CR3: 000000000d932000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0: 24 18                 and    $0x18,%al
   2: 48 8b 7c 24 38       mov    0x38(%rsp),%rdi
   7: 74 05                 je     0xe
   9: e8 89 bf 95 fd       call   0xfd95bf97
   e: 48 8b 44 24 28       mov    0x28(%rsp),%rax
  13: 49 89 45 08           mov    %rax,0x8(%r13)
  17: eb 03                 jmp    0x1c
  19: 45 31 ed             xor    %r13d,%r13d
  1c: 48 8b 1d 34 95 61 0e mov    0xe619534(%rip),%rbx        # 0xe619557
  23: 4c 89 e8             mov    %r13,%rax
  26: 48 c1 e8 03           shr    $0x3,%rax
* 2a: 42 80 3c 30 00       cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f: 74 08                 je     0x39
  31: 4c 89 ef             mov    %r13,%rdi
  34: e8 5e bf 95 fd       call   0xfd95bf97
  39: 49 89 5d 00           mov    %rbx,0x0(%r13)
  3d: 48 85 db             test   %rbx,%rbx


-- 
Yours sincerely,
Xingyu