Hay
Date
July 10, 2025, 6:10 p.m.

Environment
qemu-x86_64

[   16.485881] ==================================================================
[   16.486470] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.486743] Write of size 121 at addr ffff888102791f00 by task kunit_try_catch/302
[   16.487066] 
[   16.487383] CPU: 1 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   16.487433] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.487448] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.487472] Call Trace:
[   16.487486]  <TASK>
[   16.487505]  dump_stack_lvl+0x73/0xb0
[   16.487538]  print_report+0xd1/0x650
[   16.487561]  ? __virt_addr_valid+0x1db/0x2d0
[   16.487587]  ? _copy_from_user+0x32/0x90
[   16.487607]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.487633]  ? _copy_from_user+0x32/0x90
[   16.487653]  kasan_report+0x141/0x180
[   16.487676]  ? _copy_from_user+0x32/0x90
[   16.487701]  kasan_check_range+0x10c/0x1c0
[   16.487725]  __kasan_check_write+0x18/0x20
[   16.487746]  _copy_from_user+0x32/0x90
[   16.487768]  copy_user_test_oob+0x2be/0x10f0
[   16.487795]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.487820]  ? finish_task_switch.isra.0+0x153/0x700
[   16.487845]  ? __switch_to+0x47/0xf50
[   16.487872]  ? __schedule+0x10cc/0x2b60
[   16.487896]  ? __pfx_read_tsc+0x10/0x10
[   16.487919]  ? ktime_get_ts64+0x86/0x230
[   16.487969]  kunit_try_run_case+0x1a5/0x480
[   16.487996]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.488020]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.488057]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.488082]  ? __kthread_parkme+0x82/0x180
[   16.488106]  ? preempt_count_sub+0x50/0x80
[   16.488131]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.488156]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.488183]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.488210]  kthread+0x337/0x6f0
[   16.488231]  ? trace_preempt_on+0x20/0xc0
[   16.488255]  ? __pfx_kthread+0x10/0x10
[   16.488277]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.488300]  ? calculate_sigpending+0x7b/0xa0
[   16.488326]  ? __pfx_kthread+0x10/0x10
[   16.488350]  ret_from_fork+0x116/0x1d0
[   16.488371]  ? __pfx_kthread+0x10/0x10
[   16.488393]  ret_from_fork_asm+0x1a/0x30
[   16.488426]  </TASK>
[   16.488438] 
[   16.498080] Allocated by task 302:
[   16.498254]  kasan_save_stack+0x45/0x70
[   16.498429]  kasan_save_track+0x18/0x40
[   16.498625]  kasan_save_alloc_info+0x3b/0x50
[   16.498814]  __kasan_kmalloc+0xb7/0xc0
[   16.499020]  __kmalloc_noprof+0x1c9/0x500
[   16.499585]  kunit_kmalloc_array+0x25/0x60
[   16.499754]  copy_user_test_oob+0xab/0x10f0
[   16.500143]  kunit_try_run_case+0x1a5/0x480
[   16.500446]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.500646]  kthread+0x337/0x6f0
[   16.500930]  ret_from_fork+0x116/0x1d0
[   16.501197]  ret_from_fork_asm+0x1a/0x30
[   16.501528] 
[   16.501612] The buggy address belongs to the object at ffff888102791f00
[   16.501612]  which belongs to the cache kmalloc-128 of size 128
[   16.502324] The buggy address is located 0 bytes inside of
[   16.502324]  allocated 120-byte region [ffff888102791f00, ffff888102791f78)
[   16.502824] 
[   16.502930] The buggy address belongs to the physical page:
[   16.503467] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102791
[   16.503884] flags: 0x200000000000000(node=0|zone=2)
[   16.504265] page_type: f5(slab)
[   16.504417] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.504888] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.505325] page dumped because: kasan: bad access detected
[   16.505649] 
[   16.505740] Memory state around the buggy address:
[   16.505931]  ffff888102791e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.506464]  ffff888102791e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.506760] >ffff888102791f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.507169]                                                                 ^
[   16.507476]  ffff888102791f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.507866]  ffff888102792000: 00 00 00 00 07 fc fc fc fc fc fc fc fc fc fc fc
[   16.508263] ==================================================================