Hay
Date
July 9, 2025, 2:07 p.m.

Environment
qemu-x86_64

[   16.648456] ==================================================================
[   16.649125] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.649481] Write of size 121 at addr ffff8881029c7e00 by task kunit_try_catch/302
[   16.649752] 
[   16.649875] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   16.649927] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.649940] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.649964] Call Trace:
[   16.649978]  <TASK>
[   16.650001]  dump_stack_lvl+0x73/0xb0
[   16.650034]  print_report+0xd1/0x650
[   16.650061]  ? __virt_addr_valid+0x1db/0x2d0
[   16.650112]  ? _copy_from_user+0x32/0x90
[   16.650147]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.650172]  ? _copy_from_user+0x32/0x90
[   16.650195]  kasan_report+0x141/0x180
[   16.650218]  ? _copy_from_user+0x32/0x90
[   16.650244]  kasan_check_range+0x10c/0x1c0
[   16.650269]  __kasan_check_write+0x18/0x20
[   16.650290]  _copy_from_user+0x32/0x90
[   16.650312]  copy_user_test_oob+0x2be/0x10f0
[   16.650340]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.650365]  ? finish_task_switch.isra.0+0x153/0x700
[   16.650391]  ? __switch_to+0x47/0xf50
[   16.650419]  ? __schedule+0x10cc/0x2b60
[   16.650444]  ? __pfx_read_tsc+0x10/0x10
[   16.650468]  ? ktime_get_ts64+0x86/0x230
[   16.650495]  kunit_try_run_case+0x1a5/0x480
[   16.650520]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.650544]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.650571]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.650607]  ? __kthread_parkme+0x82/0x180
[   16.650630]  ? preempt_count_sub+0x50/0x80
[   16.650655]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.650682]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.650707]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.650734]  kthread+0x337/0x6f0
[   16.650754]  ? trace_preempt_on+0x20/0xc0
[   16.650781]  ? __pfx_kthread+0x10/0x10
[   16.650835]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.650858]  ? calculate_sigpending+0x7b/0xa0
[   16.650886]  ? __pfx_kthread+0x10/0x10
[   16.650909]  ret_from_fork+0x116/0x1d0
[   16.650929]  ? __pfx_kthread+0x10/0x10
[   16.650951]  ret_from_fork_asm+0x1a/0x30
[   16.650986]  </TASK>
[   16.650998] 
[   16.658770] Allocated by task 302:
[   16.658918]  kasan_save_stack+0x45/0x70
[   16.659069]  kasan_save_track+0x18/0x40
[   16.659203]  kasan_save_alloc_info+0x3b/0x50
[   16.659601]  __kasan_kmalloc+0xb7/0xc0
[   16.659807]  __kmalloc_noprof+0x1c9/0x500
[   16.660013]  kunit_kmalloc_array+0x25/0x60
[   16.660219]  copy_user_test_oob+0xab/0x10f0
[   16.660434]  kunit_try_run_case+0x1a5/0x480
[   16.660644]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.660823]  kthread+0x337/0x6f0
[   16.660945]  ret_from_fork+0x116/0x1d0
[   16.661078]  ret_from_fork_asm+0x1a/0x30
[   16.661220] 
[   16.661292] The buggy address belongs to the object at ffff8881029c7e00
[   16.661292]  which belongs to the cache kmalloc-128 of size 128
[   16.661954] The buggy address is located 0 bytes inside of
[   16.661954]  allocated 120-byte region [ffff8881029c7e00, ffff8881029c7e78)
[   16.662604] 
[   16.662704] The buggy address belongs to the physical page:
[   16.662937] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1029c7
[   16.663188] flags: 0x200000000000000(node=0|zone=2)
[   16.663405] page_type: f5(slab)
[   16.663576] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.663920] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.664179] page dumped because: kasan: bad access detected
[   16.664353] 
[   16.664489] Memory state around the buggy address:
[   16.664732]  ffff8881029c7d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.665227]  ffff8881029c7d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.665447] >ffff8881029c7e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.665671]                                                                 ^
[   16.665886]  ffff8881029c7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.666153]  ffff8881029c7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.666478] ==================================================================