Hay
Date
July 8, 2025, 11:09 p.m.

Environment
qemu-x86_64

[   16.469279] ==================================================================
[   16.469657] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   16.469956] Read of size 121 at addr ffff888102675c00 by task kunit_try_catch/303
[   16.470264] 
[   16.470393] CPU: 1 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   16.470440] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.470453] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.470475] Call Trace:
[   16.470494]  <TASK>
[   16.470521]  dump_stack_lvl+0x73/0xb0
[   16.470552]  print_report+0xd1/0x650
[   16.470577]  ? __virt_addr_valid+0x1db/0x2d0
[   16.470613]  ? _copy_to_user+0x3c/0x70
[   16.470633]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.470660]  ? _copy_to_user+0x3c/0x70
[   16.470680]  kasan_report+0x141/0x180
[   16.470703]  ? _copy_to_user+0x3c/0x70
[   16.470728]  kasan_check_range+0x10c/0x1c0
[   16.470753]  __kasan_check_read+0x15/0x20
[   16.470774]  _copy_to_user+0x3c/0x70
[   16.470794]  copy_user_test_oob+0x364/0x10f0
[   16.470822]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.470846]  ? finish_task_switch.isra.0+0x153/0x700
[   16.470872]  ? __switch_to+0x47/0xf50
[   16.470899]  ? __schedule+0x10cc/0x2b60
[   16.470923]  ? __pfx_read_tsc+0x10/0x10
[   16.470946]  ? ktime_get_ts64+0x86/0x230
[   16.470973]  kunit_try_run_case+0x1a5/0x480
[   16.470998]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.471022]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.471048]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.471073]  ? __kthread_parkme+0x82/0x180
[   16.471095]  ? preempt_count_sub+0x50/0x80
[   16.471120]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.471146]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.471172]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.471198]  kthread+0x337/0x6f0
[   16.471218]  ? trace_preempt_on+0x20/0xc0
[   16.471244]  ? __pfx_kthread+0x10/0x10
[   16.471265]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.471288]  ? calculate_sigpending+0x7b/0xa0
[   16.471313]  ? __pfx_kthread+0x10/0x10
[   16.471336]  ret_from_fork+0x116/0x1d0
[   16.471355]  ? __pfx_kthread+0x10/0x10
[   16.471377]  ret_from_fork_asm+0x1a/0x30
[   16.471410]  </TASK>
[   16.471420] 
[   16.478496] Allocated by task 303:
[   16.478633]  kasan_save_stack+0x45/0x70
[   16.478816]  kasan_save_track+0x18/0x40
[   16.479016]  kasan_save_alloc_info+0x3b/0x50
[   16.479227]  __kasan_kmalloc+0xb7/0xc0
[   16.479415]  __kmalloc_noprof+0x1c9/0x500
[   16.479618]  kunit_kmalloc_array+0x25/0x60
[   16.480013]  copy_user_test_oob+0xab/0x10f0
[   16.480166]  kunit_try_run_case+0x1a5/0x480
[   16.480313]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.480488]  kthread+0x337/0x6f0
[   16.480684]  ret_from_fork+0x116/0x1d0
[   16.480876]  ret_from_fork_asm+0x1a/0x30
[   16.481076] 
[   16.481174] The buggy address belongs to the object at ffff888102675c00
[   16.481174]  which belongs to the cache kmalloc-128 of size 128
[   16.481702] The buggy address is located 0 bytes inside of
[   16.481702]  allocated 120-byte region [ffff888102675c00, ffff888102675c78)
[   16.482065] 
[   16.482142] The buggy address belongs to the physical page:
[   16.482342] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102675
[   16.482778] flags: 0x200000000000000(node=0|zone=2)
[   16.483019] page_type: f5(slab)
[   16.483189] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.483759] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.484042] page dumped because: kasan: bad access detected
[   16.484211] 
[   16.484279] Memory state around the buggy address:
[   16.484433]  ffff888102675b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.484971]  ffff888102675b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.485297] >ffff888102675c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.485581]                                                                 ^
[   16.485932]  ffff888102675c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.486224]  ffff888102675d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.486510] ==================================================================