Hay
Date
July 5, 2025, 11:09 a.m.

Environment
qemu-x86_64

[   18.352998] ==================================================================
[   18.355602] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   18.357787] Write of size 121 at addr ffff888103332c00 by task kunit_try_catch/303
[   18.359495] 
[   18.359958] CPU: 1 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   18.360032] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.360052] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   18.360233] Call Trace:
[   18.360264]  <TASK>
[   18.360296]  dump_stack_lvl+0x73/0xb0
[   18.360345]  print_report+0xd1/0x650
[   18.360377]  ? __virt_addr_valid+0x1db/0x2d0
[   18.360410]  ? _copy_from_user+0x32/0x90
[   18.360435]  ? kasan_complete_mode_report_info+0x2a/0x200
[   18.360463]  ? _copy_from_user+0x32/0x90
[   18.360488]  kasan_report+0x141/0x180
[   18.360516]  ? _copy_from_user+0x32/0x90
[   18.360545]  kasan_check_range+0x10c/0x1c0
[   18.360575]  __kasan_check_write+0x18/0x20
[   18.360601]  _copy_from_user+0x32/0x90
[   18.360628]  copy_user_test_oob+0x2be/0x10f0
[   18.360675]  ? __pfx_copy_user_test_oob+0x10/0x10
[   18.360704]  ? finish_task_switch.isra.0+0x153/0x700
[   18.360733]  ? __switch_to+0x47/0xf50
[   18.360794]  ? __schedule+0x10cc/0x2b60
[   18.360822]  ? __pfx_read_tsc+0x10/0x10
[   18.360851]  ? ktime_get_ts64+0x86/0x230
[   18.360886]  kunit_try_run_case+0x1a5/0x480
[   18.360917]  ? __pfx_kunit_try_run_case+0x10/0x10
[   18.360945]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   18.360976]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   18.361005]  ? __kthread_parkme+0x82/0x180
[   18.361033]  ? preempt_count_sub+0x50/0x80
[   18.361062]  ? __pfx_kunit_try_run_case+0x10/0x10
[   18.361092]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.361121]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   18.361151]  kthread+0x337/0x6f0
[   18.361177]  ? trace_preempt_on+0x20/0xc0
[   18.361208]  ? __pfx_kthread+0x10/0x10
[   18.361234]  ? _raw_spin_unlock_irq+0x47/0x80
[   18.361260]  ? calculate_sigpending+0x7b/0xa0
[   18.361292]  ? __pfx_kthread+0x10/0x10
[   18.361319]  ret_from_fork+0x116/0x1d0
[   18.361343]  ? __pfx_kthread+0x10/0x10
[   18.361370]  ret_from_fork_asm+0x1a/0x30
[   18.361410]  </TASK>
[   18.361428] 
[   18.377439] Allocated by task 303:
[   18.377632]  kasan_save_stack+0x45/0x70
[   18.377842]  kasan_save_track+0x18/0x40
[   18.378010]  kasan_save_alloc_info+0x3b/0x50
[   18.378436]  __kasan_kmalloc+0xb7/0xc0
[   18.378893]  __kmalloc_noprof+0x1c9/0x500
[   18.379321]  kunit_kmalloc_array+0x25/0x60
[   18.379761]  copy_user_test_oob+0xab/0x10f0
[   18.380270]  kunit_try_run_case+0x1a5/0x480
[   18.380746]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.381312]  kthread+0x337/0x6f0
[   18.381615]  ret_from_fork+0x116/0x1d0
[   18.381814]  ret_from_fork_asm+0x1a/0x30
[   18.382234] 
[   18.382435] The buggy address belongs to the object at ffff888103332c00
[   18.382435]  which belongs to the cache kmalloc-128 of size 128
[   18.383383] The buggy address is located 0 bytes inside of
[   18.383383]  allocated 120-byte region [ffff888103332c00, ffff888103332c78)
[   18.383891] 
[   18.383998] The buggy address belongs to the physical page:
[   18.384269] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103332
[   18.384666] flags: 0x200000000000000(node=0|zone=2)
[   18.384956] page_type: f5(slab)
[   18.385162] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   18.385530] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   18.385827] page dumped because: kasan: bad access detected
[   18.386135] 
[   18.386331] Memory state around the buggy address:
[   18.386571]  ffff888103332b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   18.386998]  ffff888103332b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.387326] >ffff888103332c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   18.387683]                                                                 ^
[   18.388049]  ffff888103332c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.388379]  ffff888103332d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.388688] ==================================================================