Hay
Date
July 2, 2025, 11:09 p.m.

Environment
qemu-x86_64

[   15.402994] ==================================================================
[   15.403681] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.404115] Read of size 121 at addr ffff888102c8ba00 by task kunit_try_catch/304
[   15.404466] 
[   15.404666] CPU: 1 UID: 0 PID: 304 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.404724] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.404754] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.404777] Call Trace:
[   15.404792]  <TASK>
[   15.404812]  dump_stack_lvl+0x73/0xb0
[   15.404841]  print_report+0xd1/0x650
[   15.404883]  ? __virt_addr_valid+0x1db/0x2d0
[   15.404908]  ? _copy_to_user+0x3c/0x70
[   15.404927]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.404951]  ? _copy_to_user+0x3c/0x70
[   15.404970]  kasan_report+0x141/0x180
[   15.405003]  ? _copy_to_user+0x3c/0x70
[   15.405028]  kasan_check_range+0x10c/0x1c0
[   15.405052]  __kasan_check_read+0x15/0x20
[   15.405083]  _copy_to_user+0x3c/0x70
[   15.405104]  copy_user_test_oob+0x364/0x10f0
[   15.405129]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.405153]  ? finish_task_switch.isra.0+0x153/0x700
[   15.405176]  ? __switch_to+0x47/0xf50
[   15.405203]  ? __schedule+0x10cc/0x2b60
[   15.405226]  ? __pfx_read_tsc+0x10/0x10
[   15.405248]  ? ktime_get_ts64+0x86/0x230
[   15.405273]  kunit_try_run_case+0x1a5/0x480
[   15.405297]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.405320]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.405354]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.405379]  ? __kthread_parkme+0x82/0x180
[   15.405400]  ? preempt_count_sub+0x50/0x80
[   15.405425]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.405449]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.405473]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.405498]  kthread+0x337/0x6f0
[   15.405517]  ? trace_preempt_on+0x20/0xc0
[   15.405543]  ? __pfx_kthread+0x10/0x10
[   15.405565]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.405588]  ? calculate_sigpending+0x7b/0xa0
[   15.405613]  ? __pfx_kthread+0x10/0x10
[   15.405635]  ret_from_fork+0x116/0x1d0
[   15.405654]  ? __pfx_kthread+0x10/0x10
[   15.405676]  ret_from_fork_asm+0x1a/0x30
[   15.405708]  </TASK>
[   15.405720] 
[   15.418004] Allocated by task 304:
[   15.418190]  kasan_save_stack+0x45/0x70
[   15.418366]  kasan_save_track+0x18/0x40
[   15.418588]  kasan_save_alloc_info+0x3b/0x50
[   15.418799]  __kasan_kmalloc+0xb7/0xc0
[   15.418977]  __kmalloc_noprof+0x1c9/0x500
[   15.419170]  kunit_kmalloc_array+0x25/0x60
[   15.419421]  copy_user_test_oob+0xab/0x10f0
[   15.419766]  kunit_try_run_case+0x1a5/0x480
[   15.419976]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.420373]  kthread+0x337/0x6f0
[   15.420575]  ret_from_fork+0x116/0x1d0
[   15.420973]  ret_from_fork_asm+0x1a/0x30
[   15.421171] 
[   15.421252] The buggy address belongs to the object at ffff888102c8ba00
[   15.421252]  which belongs to the cache kmalloc-128 of size 128
[   15.421777] The buggy address is located 0 bytes inside of
[   15.421777]  allocated 120-byte region [ffff888102c8ba00, ffff888102c8ba78)
[   15.422259] 
[   15.422333] The buggy address belongs to the physical page:
[   15.422601] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c8b
[   15.422952] flags: 0x200000000000000(node=0|zone=2)
[   15.423240] page_type: f5(slab)
[   15.423408] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.423854] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.424179] page dumped because: kasan: bad access detected
[   15.424454] 
[   15.424560] Memory state around the buggy address:
[   15.424877]  ffff888102c8b900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.425141]  ffff888102c8b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.425414] >ffff888102c8ba00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.425907]                                                                 ^
[   15.426139]  ffff888102c8ba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.426472]  ffff888102c8bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.426786] ==================================================================