Hay
Date
July 16, 2025, 3:10 p.m.

Environment
qemu-x86_64

[   16.649037] ==================================================================
[   16.649582] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.649891] Write of size 121 at addr ffff88810307db00 by task kunit_try_catch/302
[   16.650288] 
[   16.650523] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   16.650574] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.650587] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.650610] Call Trace:
[   16.650625]  <TASK>
[   16.650644]  dump_stack_lvl+0x73/0xb0
[   16.650677]  print_report+0xd1/0x610
[   16.650703]  ? __virt_addr_valid+0x1db/0x2d0
[   16.650730]  ? _copy_from_user+0x32/0x90
[   16.650751]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.650832]  ? _copy_from_user+0x32/0x90
[   16.650854]  kasan_report+0x141/0x180
[   16.651128]  ? _copy_from_user+0x32/0x90
[   16.651283]  kasan_check_range+0x10c/0x1c0
[   16.651311]  __kasan_check_write+0x18/0x20
[   16.651332]  _copy_from_user+0x32/0x90
[   16.651355]  copy_user_test_oob+0x2be/0x10f0
[   16.651384]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.651410]  ? finish_task_switch.isra.0+0x153/0x700
[   16.651437]  ? __switch_to+0x47/0xf50
[   16.651480]  ? __schedule+0x10cc/0x2b60
[   16.651504]  ? __pfx_read_tsc+0x10/0x10
[   16.651528]  ? ktime_get_ts64+0x86/0x230
[   16.651554]  kunit_try_run_case+0x1a5/0x480
[   16.651580]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.651606]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.651632]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.651658]  ? __kthread_parkme+0x82/0x180
[   16.651681]  ? preempt_count_sub+0x50/0x80
[   16.651708]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.651736]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.651773]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.651801]  kthread+0x337/0x6f0
[   16.651822]  ? trace_preempt_on+0x20/0xc0
[   16.651849]  ? __pfx_kthread+0x10/0x10
[   16.651872]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.651896]  ? calculate_sigpending+0x7b/0xa0
[   16.651922]  ? __pfx_kthread+0x10/0x10
[   16.651946]  ret_from_fork+0x116/0x1d0
[   16.651966]  ? __pfx_kthread+0x10/0x10
[   16.651989]  ret_from_fork_asm+0x1a/0x30
[   16.652022]  </TASK>
[   16.652036] 
[   16.662453] Allocated by task 302:
[   16.662873]  kasan_save_stack+0x45/0x70
[   16.663158]  kasan_save_track+0x18/0x40
[   16.663454]  kasan_save_alloc_info+0x3b/0x50
[   16.663653]  __kasan_kmalloc+0xb7/0xc0
[   16.663920]  __kmalloc_noprof+0x1c9/0x500
[   16.664141]  kunit_kmalloc_array+0x25/0x60
[   16.664328]  copy_user_test_oob+0xab/0x10f0
[   16.664777]  kunit_try_run_case+0x1a5/0x480
[   16.665086]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.665393]  kthread+0x337/0x6f0
[   16.665688]  ret_from_fork+0x116/0x1d0
[   16.665852]  ret_from_fork_asm+0x1a/0x30
[   16.666206] 
[   16.666289] The buggy address belongs to the object at ffff88810307db00
[   16.666289]  which belongs to the cache kmalloc-128 of size 128
[   16.667450] The buggy address is located 0 bytes inside of
[   16.667450]  allocated 120-byte region [ffff88810307db00, ffff88810307db78)
[   16.668015] 
[   16.668098] The buggy address belongs to the physical page:
[   16.668275] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10307d
[   16.668544] flags: 0x200000000000000(node=0|zone=2)
[   16.668874] page_type: f5(slab)
[   16.669043] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.669363] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.670036] page dumped because: kasan: bad access detected
[   16.670354] 
[   16.670458] Memory state around the buggy address:
[   16.670624]  ffff88810307da00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.671084]  ffff88810307da80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.671447] >ffff88810307db00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.671853]                                                                 ^
[   16.672143]  ffff88810307db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.672444]  ffff88810307dc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.672968] ==================================================================