Hay
Date
July 23, 2025, 3:10 a.m.

Environment
qemu-x86_64

[   29.305919] ==================================================================
[   29.306294] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   29.306800] Read of size 121 at addr ffff8881060a7500 by task kunit_try_catch/334
[   29.307384] 
[   29.307598] CPU: 0 UID: 0 PID: 334 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) 
[   29.307658] Tainted: [B]=BAD_PAGE, [N]=TEST
[   29.307672] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   29.307696] Call Trace:
[   29.307715]  <TASK>
[   29.307940]  dump_stack_lvl+0x73/0xb0
[   29.307984]  print_report+0xd1/0x640
[   29.308012]  ? __virt_addr_valid+0x1db/0x2d0
[   29.308042]  ? _copy_to_user+0x3c/0x70
[   29.308067]  ? kasan_complete_mode_report_info+0x2a/0x200
[   29.308095]  ? _copy_to_user+0x3c/0x70
[   29.308117]  kasan_report+0x141/0x180
[   29.308140]  ? _copy_to_user+0x3c/0x70
[   29.308178]  kasan_check_range+0x10c/0x1c0
[   29.308203]  __kasan_check_read+0x15/0x20
[   29.308228]  _copy_to_user+0x3c/0x70
[   29.308249]  copy_user_test_oob+0x364/0x10f0
[   29.308277]  ? __pfx_copy_user_test_oob+0x10/0x10
[   29.308301]  ? finish_task_switch.isra.0+0x153/0x700
[   29.308324]  ? __switch_to+0x47/0xf80
[   29.308353]  ? __schedule+0x10da/0x2b60
[   29.308380]  ? __pfx_read_tsc+0x10/0x10
[   29.308406]  ? ktime_get_ts64+0x86/0x230
[   29.308457]  kunit_try_run_case+0x1a5/0x480
[   29.308483]  ? __pfx_kunit_try_run_case+0x10/0x10
[   29.308507]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   29.308545]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   29.308570]  ? __kthread_parkme+0x82/0x180
[   29.308593]  ? preempt_count_sub+0x50/0x80
[   29.308616]  ? __pfx_kunit_try_run_case+0x10/0x10
[   29.308641]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   29.308666]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   29.308691]  kthread+0x337/0x6f0
[   29.308712]  ? trace_preempt_on+0x20/0xc0
[   29.308738]  ? __pfx_kthread+0x10/0x10
[   29.308761]  ? _raw_spin_unlock_irq+0x47/0x80
[   29.308786]  ? calculate_sigpending+0x7b/0xa0
[   29.308811]  ? __pfx_kthread+0x10/0x10
[   29.308834]  ret_from_fork+0x116/0x1d0
[   29.308855]  ? __pfx_kthread+0x10/0x10
[   29.308877]  ret_from_fork_asm+0x1a/0x30
[   29.308909]  </TASK>
[   29.308923] 
[   29.319777] Allocated by task 334:
[   29.320006]  kasan_save_stack+0x45/0x70
[   29.320206]  kasan_save_track+0x18/0x40
[   29.320343]  kasan_save_alloc_info+0x3b/0x50
[   29.320647]  __kasan_kmalloc+0xb7/0xc0
[   29.321012]  __kmalloc_noprof+0x1ca/0x510
[   29.321283]  kunit_kmalloc_array+0x25/0x60
[   29.321536]  copy_user_test_oob+0xab/0x10f0
[   29.321749]  kunit_try_run_case+0x1a5/0x480
[   29.321909]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   29.322168]  kthread+0x337/0x6f0
[   29.322506]  ret_from_fork+0x116/0x1d0
[   29.322773]  ret_from_fork_asm+0x1a/0x30
[   29.322916] 
[   29.322985] The buggy address belongs to the object at ffff8881060a7500
[   29.322985]  which belongs to the cache kmalloc-128 of size 128
[   29.323740] The buggy address is located 0 bytes inside of
[   29.323740]  allocated 120-byte region [ffff8881060a7500, ffff8881060a7578)
[   29.325017] 
[   29.325114] The buggy address belongs to the physical page:
[   29.325595] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1060a7
[   29.325935] flags: 0x200000000000000(node=0|zone=2)
[   29.326238] page_type: f5(slab)
[   29.326423] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   29.326909] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   29.327442] page dumped because: kasan: bad access detected
[   29.327674] 
[   29.327765] Memory state around the buggy address:
[   29.327925]  ffff8881060a7400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   29.328252]  ffff8881060a7480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.328549] >ffff8881060a7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   29.328838]                                                                 ^
[   29.329357]  ffff8881060a7580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.329576]  ffff8881060a7600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.329926] ==================================================================