Hay
Date
July 3, 2025, 6:13 p.m.

Environment
qemu-x86_64

[   15.399916] ==================================================================
[   15.401077] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   15.401771] Write of size 121 at addr ffff8881029dbd00 by task kunit_try_catch/303
[   15.402042] 
[   15.402146] CPU: 0 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.402196] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.402209] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.402233] Call Trace:
[   15.402247]  <TASK>
[   15.402269]  dump_stack_lvl+0x73/0xb0
[   15.402299]  print_report+0xd1/0x650
[   15.402335]  ? __virt_addr_valid+0x1db/0x2d0
[   15.402361]  ? _copy_from_user+0x32/0x90
[   15.402380]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.402404]  ? _copy_from_user+0x32/0x90
[   15.402424]  kasan_report+0x141/0x180
[   15.402447]  ? _copy_from_user+0x32/0x90
[   15.402471]  kasan_check_range+0x10c/0x1c0
[   15.402495]  __kasan_check_write+0x18/0x20
[   15.402515]  _copy_from_user+0x32/0x90
[   15.402536]  copy_user_test_oob+0x2be/0x10f0
[   15.402563]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.402586]  ? finish_task_switch.isra.0+0x153/0x700
[   15.402610]  ? __switch_to+0x47/0xf50
[   15.402637]  ? __schedule+0x10cc/0x2b60
[   15.402659]  ? __pfx_read_tsc+0x10/0x10
[   15.402682]  ? ktime_get_ts64+0x86/0x230
[   15.402708]  kunit_try_run_case+0x1a5/0x480
[   15.402732]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.402755]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.402780]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.402806]  ? __kthread_parkme+0x82/0x180
[   15.402828]  ? preempt_count_sub+0x50/0x80
[   15.402852]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.402877]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.402901]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.402926]  kthread+0x337/0x6f0
[   15.402946]  ? trace_preempt_on+0x20/0xc0
[   15.402971]  ? __pfx_kthread+0x10/0x10
[   15.402993]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.403015]  ? calculate_sigpending+0x7b/0xa0
[   15.403039]  ? __pfx_kthread+0x10/0x10
[   15.403061]  ret_from_fork+0x116/0x1d0
[   15.403081]  ? __pfx_kthread+0x10/0x10
[   15.403162]  ret_from_fork_asm+0x1a/0x30
[   15.403197]  </TASK>
[   15.403218] 
[   15.417029] Allocated by task 303:
[   15.417230]  kasan_save_stack+0x45/0x70
[   15.417737]  kasan_save_track+0x18/0x40
[   15.417983]  kasan_save_alloc_info+0x3b/0x50
[   15.418319]  __kasan_kmalloc+0xb7/0xc0
[   15.418528]  __kmalloc_noprof+0x1c9/0x500
[   15.418721]  kunit_kmalloc_array+0x25/0x60
[   15.418909]  copy_user_test_oob+0xab/0x10f0
[   15.419114]  kunit_try_run_case+0x1a5/0x480
[   15.419315]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.419546]  kthread+0x337/0x6f0
[   15.419702]  ret_from_fork+0x116/0x1d0
[   15.419876]  ret_from_fork_asm+0x1a/0x30
[   15.420055] 
[   15.420598] The buggy address belongs to the object at ffff8881029dbd00
[   15.420598]  which belongs to the cache kmalloc-128 of size 128
[   15.421500] The buggy address is located 0 bytes inside of
[   15.421500]  allocated 120-byte region [ffff8881029dbd00, ffff8881029dbd78)
[   15.422415] 
[   15.422533] The buggy address belongs to the physical page:
[   15.422950] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1029db
[   15.423656] flags: 0x200000000000000(node=0|zone=2)
[   15.424150] page_type: f5(slab)
[   15.424329] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.424641] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.424942] page dumped because: kasan: bad access detected
[   15.425179] 
[   15.425271] Memory state around the buggy address:
[   15.425872]  ffff8881029dbc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.426336]  ffff8881029dbc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.426827] >ffff8881029dbd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.427356]                                                                 ^
[   15.427856]  ffff8881029dbd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.428167]  ffff8881029dbe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.428874] ==================================================================