Hay
Date
July 5, 2025, 5:09 p.m.

Environment
qemu-x86_64

[   15.576887] ==================================================================
[   15.577583] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   15.577973] Write of size 121 at addr ffff8881031c1900 by task kunit_try_catch/304
[   15.578301] 
[   15.578438] CPU: 0 UID: 0 PID: 304 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.578507] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.578532] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.578557] Call Trace:
[   15.578573]  <TASK>
[   15.578594]  dump_stack_lvl+0x73/0xb0
[   15.578628]  print_report+0xd1/0x650
[   15.578654]  ? __virt_addr_valid+0x1db/0x2d0
[   15.578680]  ? _copy_from_user+0x32/0x90
[   15.578711]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.578735]  ? _copy_from_user+0x32/0x90
[   15.578755]  kasan_report+0x141/0x180
[   15.578790]  ? _copy_from_user+0x32/0x90
[   15.578825]  kasan_check_range+0x10c/0x1c0
[   15.578850]  __kasan_check_write+0x18/0x20
[   15.578871]  _copy_from_user+0x32/0x90
[   15.578904]  copy_user_test_oob+0x2be/0x10f0
[   15.578932]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.578957]  ? finish_task_switch.isra.0+0x153/0x700
[   15.578982]  ? __switch_to+0x47/0xf50
[   15.579010]  ? __schedule+0x10cc/0x2b60
[   15.579034]  ? __pfx_read_tsc+0x10/0x10
[   15.579067]  ? ktime_get_ts64+0x86/0x230
[   15.579093]  kunit_try_run_case+0x1a5/0x480
[   15.579119]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.579153]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.579179]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.579205]  ? __kthread_parkme+0x82/0x180
[   15.579236]  ? preempt_count_sub+0x50/0x80
[   15.579262]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.579297]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.579324]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.579348]  kthread+0x337/0x6f0
[   15.579382]  ? trace_preempt_on+0x20/0xc0
[   15.579408]  ? __pfx_kthread+0x10/0x10
[   15.579431]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.579463]  ? calculate_sigpending+0x7b/0xa0
[   15.579489]  ? __pfx_kthread+0x10/0x10
[   15.579513]  ret_from_fork+0x116/0x1d0
[   15.579533]  ? __pfx_kthread+0x10/0x10
[   15.579556]  ret_from_fork_asm+0x1a/0x30
[   15.579589]  </TASK>
[   15.579602] 
[   15.591127] Allocated by task 304:
[   15.591659]  kasan_save_stack+0x45/0x70
[   15.592053]  kasan_save_track+0x18/0x40
[   15.592471]  kasan_save_alloc_info+0x3b/0x50
[   15.592688]  __kasan_kmalloc+0xb7/0xc0
[   15.592904]  __kmalloc_noprof+0x1c9/0x500
[   15.593114]  kunit_kmalloc_array+0x25/0x60
[   15.593317]  copy_user_test_oob+0xab/0x10f0
[   15.593550]  kunit_try_run_case+0x1a5/0x480
[   15.593769]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.594498]  kthread+0x337/0x6f0
[   15.594844]  ret_from_fork+0x116/0x1d0
[   15.595139]  ret_from_fork_asm+0x1a/0x30
[   15.595369] 
[   15.595546] The buggy address belongs to the object at ffff8881031c1900
[   15.595546]  which belongs to the cache kmalloc-128 of size 128
[   15.596129] The buggy address is located 0 bytes inside of
[   15.596129]  allocated 120-byte region [ffff8881031c1900, ffff8881031c1978)
[   15.597519] 
[   15.597628] The buggy address belongs to the physical page:
[   15.598079] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1031c1
[   15.598852] flags: 0x200000000000000(node=0|zone=2)
[   15.599099] page_type: f5(slab)
[   15.599496] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.599979] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.600467] page dumped because: kasan: bad access detected
[   15.600737] 
[   15.601019] Memory state around the buggy address:
[   15.601349]  ffff8881031c1800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.601724]  ffff8881031c1880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.602202] >ffff8881031c1900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.602523]                                                                 ^
[   15.602985]  ffff8881031c1980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.603551]  ffff8881031c1a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.604036] ==================================================================