Hay
Date
July 15, 2025, 11:09 a.m.

Environment
qemu-x86_64

[   16.498944] ==================================================================
[   16.499569] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.500264] Write of size 121 at addr ffff8881038e2900 by task kunit_try_catch/302
[   16.501151] 
[   16.501365] CPU: 1 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   16.501416] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.501430] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.501462] Call Trace:
[   16.501477]  <TASK>
[   16.501496]  dump_stack_lvl+0x73/0xb0
[   16.501530]  print_report+0xd1/0x610
[   16.501557]  ? __virt_addr_valid+0x1db/0x2d0
[   16.501583]  ? _copy_from_user+0x32/0x90
[   16.501604]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.501629]  ? _copy_from_user+0x32/0x90
[   16.501651]  kasan_report+0x141/0x180
[   16.501674]  ? _copy_from_user+0x32/0x90
[   16.501700]  kasan_check_range+0x10c/0x1c0
[   16.501726]  __kasan_check_write+0x18/0x20
[   16.501746]  _copy_from_user+0x32/0x90
[   16.501780]  copy_user_test_oob+0x2be/0x10f0
[   16.501809]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.501834]  ? finish_task_switch.isra.0+0x153/0x700
[   16.501860]  ? __switch_to+0x47/0xf50
[   16.501888]  ? __schedule+0x10cc/0x2b60
[   16.501912]  ? __pfx_read_tsc+0x10/0x10
[   16.501936]  ? ktime_get_ts64+0x86/0x230
[   16.501963]  kunit_try_run_case+0x1a5/0x480
[   16.501988]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.502014]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.502040]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.502066]  ? __kthread_parkme+0x82/0x180
[   16.502088]  ? preempt_count_sub+0x50/0x80
[   16.502113]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.502141]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.502167]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.502195]  kthread+0x337/0x6f0
[   16.502216]  ? trace_preempt_on+0x20/0xc0
[   16.502243]  ? __pfx_kthread+0x10/0x10
[   16.502265]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.502289]  ? calculate_sigpending+0x7b/0xa0
[   16.502316]  ? __pfx_kthread+0x10/0x10
[   16.502339]  ret_from_fork+0x116/0x1d0
[   16.502360]  ? __pfx_kthread+0x10/0x10
[   16.502387]  ret_from_fork_asm+0x1a/0x30
[   16.502420]  </TASK>
[   16.502433] 
[   16.509833] Allocated by task 302:
[   16.510018]  kasan_save_stack+0x45/0x70
[   16.510218]  kasan_save_track+0x18/0x40
[   16.510418]  kasan_save_alloc_info+0x3b/0x50
[   16.510585]  __kasan_kmalloc+0xb7/0xc0
[   16.510749]  __kmalloc_noprof+0x1c9/0x500
[   16.510967]  kunit_kmalloc_array+0x25/0x60
[   16.511184]  copy_user_test_oob+0xab/0x10f0
[   16.511349]  kunit_try_run_case+0x1a5/0x480
[   16.511633]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.511876]  kthread+0x337/0x6f0
[   16.512032]  ret_from_fork+0x116/0x1d0
[   16.512191]  ret_from_fork_asm+0x1a/0x30
[   16.512391] 
[   16.512504] The buggy address belongs to the object at ffff8881038e2900
[   16.512504]  which belongs to the cache kmalloc-128 of size 128
[   16.512978] The buggy address is located 0 bytes inside of
[   16.512978]  allocated 120-byte region [ffff8881038e2900, ffff8881038e2978)
[   16.513473] 
[   16.513548] The buggy address belongs to the physical page:
[   16.513724] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1038e2
[   16.513976] flags: 0x200000000000000(node=0|zone=2)
[   16.514141] page_type: f5(slab)
[   16.514285] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.514633] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.514976] page dumped because: kasan: bad access detected
[   16.515273] 
[   16.515369] Memory state around the buggy address:
[   16.515655]  ffff8881038e2800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.515930]  ffff8881038e2880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.516153] >ffff8881038e2900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.516371]                                                                 ^
[   16.517017]  ffff8881038e2980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.517341]  ffff8881038e2a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.517742] ==================================================================