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

Environment
qemu-x86_64

[   15.136734] ==================================================================
[   15.137778] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   15.138112] Write of size 121 at addr ffff888103151e00 by task kunit_try_catch/305
[   15.138384] 
[   15.138511] CPU: 0 UID: 0 PID: 305 Comm: kunit_try_catch Tainted: G    B            N  6.15.5-rc1 #1 PREEMPT(voluntary) 
[   15.138566] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.138580] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.138607] Call Trace:
[   15.138622]  <TASK>
[   15.138646]  dump_stack_lvl+0x73/0xb0
[   15.138678]  print_report+0xd1/0x650
[   15.138705]  ? __virt_addr_valid+0x1db/0x2d0
[   15.138731]  ? _copy_from_user+0x32/0x90
[   15.138752]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.138776]  ? _copy_from_user+0x32/0x90
[   15.138797]  kasan_report+0x141/0x180
[   15.138821]  ? _copy_from_user+0x32/0x90
[   15.138846]  kasan_check_range+0x10c/0x1c0
[   15.138868]  __kasan_check_write+0x18/0x20
[   15.138889]  _copy_from_user+0x32/0x90
[   15.138910]  copy_user_test_oob+0x2be/0x10f0
[   15.138935]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.138955]  ? finish_task_switch.isra.0+0x153/0x700
[   15.138982]  ? __switch_to+0x5d9/0xf60
[   15.139006]  ? dequeue_task_fair+0x166/0x4e0
[   15.139032]  ? __schedule+0x10cc/0x2b60
[   15.139057]  ? __pfx_read_tsc+0x10/0x10
[   15.139078]  ? ktime_get_ts64+0x86/0x230
[   15.139105]  kunit_try_run_case+0x1a5/0x480
[   15.139131]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.139154]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.139180]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.139205]  ? __kthread_parkme+0x82/0x180
[   15.139242]  ? preempt_count_sub+0x50/0x80
[   15.139268]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.139294]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.139319]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.139343]  kthread+0x337/0x6f0
[   15.139362]  ? trace_preempt_on+0x20/0xc0
[   15.139387]  ? __pfx_kthread+0x10/0x10
[   15.139407]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.139430]  ? calculate_sigpending+0x7b/0xa0
[   15.139453]  ? __pfx_kthread+0x10/0x10
[   15.139473]  ret_from_fork+0x41/0x80
[   15.139495]  ? __pfx_kthread+0x10/0x10
[   15.139514]  ret_from_fork_asm+0x1a/0x30
[   15.139547]  </TASK>
[   15.139560] 
[   15.149207] Allocated by task 305:
[   15.149431]  kasan_save_stack+0x45/0x70
[   15.149633]  kasan_save_track+0x18/0x40
[   15.150061]  kasan_save_alloc_info+0x3b/0x50
[   15.150279]  __kasan_kmalloc+0xb7/0xc0
[   15.150581]  __kmalloc_noprof+0x1c9/0x500
[   15.150766]  kunit_kmalloc_array+0x25/0x60
[   15.151082]  copy_user_test_oob+0xab/0x10f0
[   15.151271]  kunit_try_run_case+0x1a5/0x480
[   15.151593]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.151904]  kthread+0x337/0x6f0
[   15.152059]  ret_from_fork+0x41/0x80
[   15.152236]  ret_from_fork_asm+0x1a/0x30
[   15.152424] 
[   15.152522] The buggy address belongs to the object at ffff888103151e00
[   15.152522]  which belongs to the cache kmalloc-128 of size 128
[   15.153287] The buggy address is located 0 bytes inside of
[   15.153287]  allocated 120-byte region [ffff888103151e00, ffff888103151e78)
[   15.153998] 
[   15.154238] The buggy address belongs to the physical page:
[   15.154504] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103151
[   15.154925] flags: 0x200000000000000(node=0|zone=2)
[   15.155273] page_type: f5(slab)
[   15.155414] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.155853] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.156174] page dumped because: kasan: bad access detected
[   15.156431] 
[   15.156512] Memory state around the buggy address:
[   15.156720]  ffff888103151d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.157015]  ffff888103151d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.157319] >ffff888103151e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.157625]                                                                 ^
[   15.158311]  ffff888103151e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.158729]  ffff888103151f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.159070] ==================================================================