Hay
Date
July 1, 2025, 12:10 a.m.

Environment
qemu-x86_64

[   15.330706] ==================================================================
[   15.331023] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.331397] Read of size 121 at addr ffff888103917500 by task kunit_try_catch/302
[   15.331752] 
[   15.331848] CPU: 1 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.331892] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.331905] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.331928] Call Trace:
[   15.331945]  <TASK>
[   15.331960]  dump_stack_lvl+0x73/0xb0
[   15.331997]  print_report+0xd1/0x650
[   15.332021]  ? __virt_addr_valid+0x1db/0x2d0
[   15.332062]  ? _copy_to_user+0x3c/0x70
[   15.332081]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.332104]  ? _copy_to_user+0x3c/0x70
[   15.332124]  kasan_report+0x141/0x180
[   15.332147]  ? _copy_to_user+0x3c/0x70
[   15.332171]  kasan_check_range+0x10c/0x1c0
[   15.332195]  __kasan_check_read+0x15/0x20
[   15.332214]  _copy_to_user+0x3c/0x70
[   15.332234]  copy_user_test_oob+0x364/0x10f0
[   15.332259]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.332302]  ? finish_task_switch.isra.0+0x153/0x700
[   15.332325]  ? __switch_to+0x47/0xf50
[   15.332361]  ? __schedule+0x10cc/0x2b60
[   15.332384]  ? __pfx_read_tsc+0x10/0x10
[   15.332406]  ? ktime_get_ts64+0x86/0x230
[   15.332430]  kunit_try_run_case+0x1a5/0x480
[   15.332454]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.332477]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.332501]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.332524]  ? __kthread_parkme+0x82/0x180
[   15.332545]  ? preempt_count_sub+0x50/0x80
[   15.332569]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.332593]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.332617]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.332641]  kthread+0x337/0x6f0
[   15.332660]  ? trace_preempt_on+0x20/0xc0
[   15.332683]  ? __pfx_kthread+0x10/0x10
[   15.332704]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.332726]  ? calculate_sigpending+0x7b/0xa0
[   15.332750]  ? __pfx_kthread+0x10/0x10
[   15.332772]  ret_from_fork+0x116/0x1d0
[   15.332791]  ? __pfx_kthread+0x10/0x10
[   15.332812]  ret_from_fork_asm+0x1a/0x30
[   15.332843]  </TASK>
[   15.332854] 
[   15.340341] Allocated by task 302:
[   15.340543]  kasan_save_stack+0x45/0x70
[   15.340822]  kasan_save_track+0x18/0x40
[   15.341021]  kasan_save_alloc_info+0x3b/0x50
[   15.341293]  __kasan_kmalloc+0xb7/0xc0
[   15.341477]  __kmalloc_noprof+0x1c9/0x500
[   15.341630]  kunit_kmalloc_array+0x25/0x60
[   15.341838]  copy_user_test_oob+0xab/0x10f0
[   15.342054]  kunit_try_run_case+0x1a5/0x480
[   15.342290]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.342541]  kthread+0x337/0x6f0
[   15.342704]  ret_from_fork+0x116/0x1d0
[   15.342895]  ret_from_fork_asm+0x1a/0x30
[   15.343108] 
[   15.343210] The buggy address belongs to the object at ffff888103917500
[   15.343210]  which belongs to the cache kmalloc-128 of size 128
[   15.343758] The buggy address is located 0 bytes inside of
[   15.343758]  allocated 120-byte region [ffff888103917500, ffff888103917578)
[   15.344153] 
[   15.344227] The buggy address belongs to the physical page:
[   15.344403] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103917
[   15.344815] flags: 0x200000000000000(node=0|zone=2)
[   15.345060] page_type: f5(slab)
[   15.345224] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.345794] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.346021] page dumped because: kasan: bad access detected
[   15.346204] 
[   15.346297] Memory state around the buggy address:
[   15.346675]  ffff888103917400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.347025]  ffff888103917480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.347404] >ffff888103917500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.347670]                                                                 ^
[   15.348013]  ffff888103917580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.348337]  ffff888103917600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.348652] ==================================================================