Hay
Date
July 20, 2025, 11:12 a.m.

Environment
qemu-x86_64

[   16.328647] ==================================================================
[   16.330010] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.330819] Write of size 121 at addr ffff888102ad4e00 by task kunit_try_catch/303
[   16.331172] 
[   16.331291] CPU: 0 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   16.331343] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.331356] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.331381] Call Trace:
[   16.331394]  <TASK>
[   16.331415]  dump_stack_lvl+0x73/0xb0
[   16.331447]  print_report+0xd1/0x610
[   16.331472]  ? __virt_addr_valid+0x1db/0x2d0
[   16.331497]  ? _copy_from_user+0x32/0x90
[   16.331516]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.331539]  ? _copy_from_user+0x32/0x90
[   16.331559]  kasan_report+0x141/0x180
[   16.331581]  ? _copy_from_user+0x32/0x90
[   16.331605]  kasan_check_range+0x10c/0x1c0
[   16.331629]  __kasan_check_write+0x18/0x20
[   16.331648]  _copy_from_user+0x32/0x90
[   16.331668]  copy_user_test_oob+0x2be/0x10f0
[   16.331942]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.331967]  ? finish_task_switch.isra.0+0x153/0x700
[   16.332024]  ? __switch_to+0x47/0xf50
[   16.332053]  ? __schedule+0x10cc/0x2b60
[   16.332077]  ? __pfx_read_tsc+0x10/0x10
[   16.332099]  ? ktime_get_ts64+0x86/0x230
[   16.332123]  kunit_try_run_case+0x1a5/0x480
[   16.332147]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.332169]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.332193]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.332216]  ? __kthread_parkme+0x82/0x180
[   16.332238]  ? preempt_count_sub+0x50/0x80
[   16.332261]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.332284]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.332308]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.332331]  kthread+0x337/0x6f0
[   16.332351]  ? trace_preempt_on+0x20/0xc0
[   16.332376]  ? __pfx_kthread+0x10/0x10
[   16.332397]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.332418]  ? calculate_sigpending+0x7b/0xa0
[   16.332442]  ? __pfx_kthread+0x10/0x10
[   16.332464]  ret_from_fork+0x116/0x1d0
[   16.332484]  ? __pfx_kthread+0x10/0x10
[   16.332504]  ret_from_fork_asm+0x1a/0x30
[   16.332535]  </TASK>
[   16.332548] 
[   16.345993] Allocated by task 303:
[   16.346172]  kasan_save_stack+0x45/0x70
[   16.346738]  kasan_save_track+0x18/0x40
[   16.347125]  kasan_save_alloc_info+0x3b/0x50
[   16.347334]  __kasan_kmalloc+0xb7/0xc0
[   16.347845]  __kmalloc_noprof+0x1c9/0x500
[   16.348607]  kunit_kmalloc_array+0x25/0x60
[   16.348884]  copy_user_test_oob+0xab/0x10f0
[   16.349097]  kunit_try_run_case+0x1a5/0x480
[   16.349290]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.349899]  kthread+0x337/0x6f0
[   16.350084]  ret_from_fork+0x116/0x1d0
[   16.350253]  ret_from_fork_asm+0x1a/0x30
[   16.350870] 
[   16.351042] The buggy address belongs to the object at ffff888102ad4e00
[   16.351042]  which belongs to the cache kmalloc-128 of size 128
[   16.351902] The buggy address is located 0 bytes inside of
[   16.351902]  allocated 120-byte region [ffff888102ad4e00, ffff888102ad4e78)
[   16.353080] 
[   16.353617] The buggy address belongs to the physical page:
[   16.353953] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102ad4
[   16.354291] flags: 0x200000000000000(node=0|zone=2)
[   16.355031] page_type: f5(slab)
[   16.355293] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.355940] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.356659] page dumped because: kasan: bad access detected
[   16.356921] 
[   16.357016] Memory state around the buggy address:
[   16.357225]  ffff888102ad4d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.358087]  ffff888102ad4d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.358536] >ffff888102ad4e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.359177]                                                                 ^
[   16.359838]  ffff888102ad4e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.360331]  ffff888102ad4f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.361166] ==================================================================