Hay
Date
May 23, 2025, 11:07 p.m.

Environment
qemu-x86_64

[   16.444704] ==================================================================
[   16.445089] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x4a/0x70
[   16.445398] Read of size 121 at addr ffff888102a4e100 by task kunit_try_catch/304
[   16.445838] 
[   16.445957] CPU: 1 UID: 0 PID: 304 Comm: kunit_try_catch Tainted: G    B            N  6.15.0-rc7 #1 PREEMPT(voluntary) 
[   16.446006] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.446020] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.446042] Call Trace:
[   16.446059]  <TASK>
[   16.446076]  dump_stack_lvl+0x73/0xb0
[   16.446124]  print_report+0xd1/0x650
[   16.446149]  ? __virt_addr_valid+0x1db/0x2d0
[   16.446172]  ? _copy_to_user+0x4a/0x70
[   16.446191]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.446215]  ? _copy_to_user+0x4a/0x70
[   16.446235]  kasan_report+0x141/0x180
[   16.446259]  ? _copy_to_user+0x4a/0x70
[   16.446283]  kasan_check_range+0x10c/0x1c0
[   16.446316]  __kasan_check_read+0x15/0x20
[   16.446337]  _copy_to_user+0x4a/0x70
[   16.446358]  copy_user_test_oob+0x364/0x10f0
[   16.446399]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.446420]  ? finish_task_switch.isra.0+0x153/0x700
[   16.446445]  ? __switch_to+0x5d9/0xf60
[   16.446466]  ? dequeue_task_fair+0x166/0x4e0
[   16.446491]  ? __schedule+0x10cc/0x2b30
[   16.446514]  ? __pfx_read_tsc+0x10/0x10
[   16.446534]  ? ktime_get_ts64+0x86/0x230
[   16.446561]  kunit_try_run_case+0x1a5/0x480
[   16.446604]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.446628]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.446652]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.446677]  ? __kthread_parkme+0x82/0x180
[   16.446706]  ? preempt_count_sub+0x50/0x80
[   16.446731]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.446755]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.446779]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.446803]  kthread+0x337/0x6f0
[   16.446821]  ? trace_preempt_on+0x20/0xc0
[   16.446846]  ? __pfx_kthread+0x10/0x10
[   16.446865]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.446887]  ? calculate_sigpending+0x7b/0xa0
[   16.446910]  ? __pfx_kthread+0x10/0x10
[   16.446931]  ret_from_fork+0x41/0x80
[   16.446952]  ? __pfx_kthread+0x10/0x10
[   16.446971]  ret_from_fork_asm+0x1a/0x30
[   16.447002]  </TASK>
[   16.447014] 
[   16.454937] Allocated by task 304:
[   16.455107]  kasan_save_stack+0x45/0x70
[   16.455349]  kasan_save_track+0x18/0x40
[   16.455609]  kasan_save_alloc_info+0x3b/0x50
[   16.455891]  __kasan_kmalloc+0xb7/0xc0
[   16.456023]  __kmalloc_noprof+0x1c9/0x500
[   16.456161]  kunit_kmalloc_array+0x25/0x60
[   16.456618]  copy_user_test_oob+0xab/0x10f0
[   16.456830]  kunit_try_run_case+0x1a5/0x480
[   16.457055]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.457389]  kthread+0x337/0x6f0
[   16.457586]  ret_from_fork+0x41/0x80
[   16.457788]  ret_from_fork_asm+0x1a/0x30
[   16.457985] 
[   16.458080] The buggy address belongs to the object at ffff888102a4e100
[   16.458080]  which belongs to the cache kmalloc-128 of size 128
[   16.458730] The buggy address is located 0 bytes inside of
[   16.458730]  allocated 120-byte region [ffff888102a4e100, ffff888102a4e178)
[   16.459074] 
[   16.459146] The buggy address belongs to the physical page:
[   16.459395] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102a4e
[   16.460123] flags: 0x200000000000000(node=0|zone=2)
[   16.460375] page_type: f5(slab)
[   16.460576] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.460912] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.461228] page dumped because: kasan: bad access detected
[   16.461459] 
[   16.461559] Memory state around the buggy address:
[   16.461768]  ffff888102a4e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.462040]  ffff888102a4e080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.462340] >ffff888102a4e100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.462618]                                                                 ^
[   16.462832]  ffff888102a4e180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.463098]  ffff888102a4e200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.463420] ==================================================================