Hay
Date
July 3, 2025, 3:13 p.m.

Environment
qemu-x86_64

[   15.162851] ==================================================================
[   15.163192] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x4a/0x70
[   15.163515] Read of size 121 at addr ffff888103151e00 by task kunit_try_catch/305
[   15.163925] 
[   15.164030] CPU: 0 UID: 0 PID: 305 Comm: kunit_try_catch Tainted: G    B            N  6.15.5-rc1 #1 PREEMPT(voluntary) 
[   15.164080] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.164094] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.164117] Call Trace:
[   15.164137]  <TASK>
[   15.164160]  dump_stack_lvl+0x73/0xb0
[   15.164213]  print_report+0xd1/0x650
[   15.164251]  ? __virt_addr_valid+0x1db/0x2d0
[   15.164294]  ? _copy_to_user+0x4a/0x70
[   15.164316]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.164340]  ? _copy_to_user+0x4a/0x70
[   15.164361]  kasan_report+0x141/0x180
[   15.164385]  ? _copy_to_user+0x4a/0x70
[   15.164410]  kasan_check_range+0x10c/0x1c0
[   15.164432]  __kasan_check_read+0x15/0x20
[   15.164453]  _copy_to_user+0x4a/0x70
[   15.164474]  copy_user_test_oob+0x364/0x10f0
[   15.164498]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.164519]  ? finish_task_switch.isra.0+0x153/0x700
[   15.164544]  ? __switch_to+0x5d9/0xf60
[   15.164567]  ? dequeue_task_fair+0x166/0x4e0
[   15.164592]  ? __schedule+0x10cc/0x2b60
[   15.164617]  ? __pfx_read_tsc+0x10/0x10
[   15.164639]  ? ktime_get_ts64+0x86/0x230
[   15.164665]  kunit_try_run_case+0x1a5/0x480
[   15.164691]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.164714]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.164740]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.164766]  ? __kthread_parkme+0x82/0x180
[   15.164789]  ? preempt_count_sub+0x50/0x80
[   15.164814]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.164839]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.164864]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.164889]  kthread+0x337/0x6f0
[   15.164907]  ? trace_preempt_on+0x20/0xc0
[   15.164932]  ? __pfx_kthread+0x10/0x10
[   15.164951]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.164974]  ? calculate_sigpending+0x7b/0xa0
[   15.164997]  ? __pfx_kthread+0x10/0x10
[   15.165018]  ret_from_fork+0x41/0x80
[   15.165039]  ? __pfx_kthread+0x10/0x10
[   15.165057]  ret_from_fork_asm+0x1a/0x30
[   15.165090]  </TASK>
[   15.165101] 
[   15.175967] Allocated by task 305:
[   15.176123]  kasan_save_stack+0x45/0x70
[   15.176337]  kasan_save_track+0x18/0x40
[   15.176517]  kasan_save_alloc_info+0x3b/0x50
[   15.177005]  __kasan_kmalloc+0xb7/0xc0
[   15.177184]  __kmalloc_noprof+0x1c9/0x500
[   15.177614]  kunit_kmalloc_array+0x25/0x60
[   15.177936]  copy_user_test_oob+0xab/0x10f0
[   15.178221]  kunit_try_run_case+0x1a5/0x480
[   15.178521]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.178874]  kthread+0x337/0x6f0
[   15.179131]  ret_from_fork+0x41/0x80
[   15.179422]  ret_from_fork_asm+0x1a/0x30
[   15.179696] 
[   15.179958] The buggy address belongs to the object at ffff888103151e00
[   15.179958]  which belongs to the cache kmalloc-128 of size 128
[   15.180568] The buggy address is located 0 bytes inside of
[   15.180568]  allocated 120-byte region [ffff888103151e00, ffff888103151e78)
[   15.181243] 
[   15.181357] The buggy address belongs to the physical page:
[   15.181589] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103151
[   15.181911] flags: 0x200000000000000(node=0|zone=2)
[   15.182175] page_type: f5(slab)
[   15.182371] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.182733] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.182962] page dumped because: kasan: bad access detected
[   15.183201] 
[   15.183307] Memory state around the buggy address:
[   15.183542]  ffff888103151d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.183847]  ffff888103151d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.184151] >ffff888103151e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.184446]                                                                 ^
[   15.184830]  ffff888103151e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.185050]  ffff888103151f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.185379] ==================================================================