Hay
Date
July 3, 2025, 11:10 p.m.

Environment
qemu-x86_64

[   15.600986] ==================================================================
[   15.601333] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.601755] Read of size 121 at addr ffff8881039bf700 by task kunit_try_catch/303
[   15.602053] 
[   15.602173] CPU: 1 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.602217] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.602253] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.602275] Call Trace:
[   15.602292]  <TASK>
[   15.602309]  dump_stack_lvl+0x73/0xb0
[   15.602336]  print_report+0xd1/0x650
[   15.602361]  ? __virt_addr_valid+0x1db/0x2d0
[   15.602384]  ? _copy_to_user+0x3c/0x70
[   15.602422]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.602447]  ? _copy_to_user+0x3c/0x70
[   15.602467]  kasan_report+0x141/0x180
[   15.602490]  ? _copy_to_user+0x3c/0x70
[   15.602522]  kasan_check_range+0x10c/0x1c0
[   15.602547]  __kasan_check_read+0x15/0x20
[   15.602566]  _copy_to_user+0x3c/0x70
[   15.602587]  copy_user_test_oob+0x364/0x10f0
[   15.602614]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.602638]  ? finish_task_switch.isra.0+0x153/0x700
[   15.602661]  ? __switch_to+0x47/0xf50
[   15.602686]  ? __schedule+0x10cc/0x2b60
[   15.602725]  ? __pfx_read_tsc+0x10/0x10
[   15.602747]  ? ktime_get_ts64+0x86/0x230
[   15.602770]  kunit_try_run_case+0x1a5/0x480
[   15.602795]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.602818]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.602842]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.602866]  ? __kthread_parkme+0x82/0x180
[   15.602902]  ? preempt_count_sub+0x50/0x80
[   15.602927]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.602951]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.602975]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.602999]  kthread+0x337/0x6f0
[   15.603019]  ? trace_preempt_on+0x20/0xc0
[   15.603042]  ? __pfx_kthread+0x10/0x10
[   15.603063]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.603085]  ? calculate_sigpending+0x7b/0xa0
[   15.603109]  ? __pfx_kthread+0x10/0x10
[   15.603153]  ret_from_fork+0x116/0x1d0
[   15.603173]  ? __pfx_kthread+0x10/0x10
[   15.603194]  ret_from_fork_asm+0x1a/0x30
[   15.603225]  </TASK>
[   15.603238] 
[   15.612138] Allocated by task 303:
[   15.612340]  kasan_save_stack+0x45/0x70
[   15.612578]  kasan_save_track+0x18/0x40
[   15.612769]  kasan_save_alloc_info+0x3b/0x50
[   15.612981]  __kasan_kmalloc+0xb7/0xc0
[   15.613209]  __kmalloc_noprof+0x1c9/0x500
[   15.613406]  kunit_kmalloc_array+0x25/0x60
[   15.613606]  copy_user_test_oob+0xab/0x10f0
[   15.613792]  kunit_try_run_case+0x1a5/0x480
[   15.613936]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.614133]  kthread+0x337/0x6f0
[   15.614310]  ret_from_fork+0x116/0x1d0
[   15.614523]  ret_from_fork_asm+0x1a/0x30
[   15.614727] 
[   15.614843] The buggy address belongs to the object at ffff8881039bf700
[   15.614843]  which belongs to the cache kmalloc-128 of size 128
[   15.615358] The buggy address is located 0 bytes inside of
[   15.615358]  allocated 120-byte region [ffff8881039bf700, ffff8881039bf778)
[   15.615844] 
[   15.615924] The buggy address belongs to the physical page:
[   15.616227] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039bf
[   15.616576] flags: 0x200000000000000(node=0|zone=2)
[   15.616796] page_type: f5(slab)
[   15.616958] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.617380] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.617766] page dumped because: kasan: bad access detected
[   15.618029] 
[   15.618136] Memory state around the buggy address:
[   15.618355]  ffff8881039bf600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.618749]  ffff8881039bf680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.619048] >ffff8881039bf700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.619262]                                                                 ^
[   15.619466]  ffff8881039bf780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.619891]  ffff8881039bf800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.620336] ==================================================================