Hay
Date
June 2, 2025, 2:11 p.m.

Environment
qemu-x86_64

[   22.031871] ==================================================================
[   22.032400] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x4a/0x70
[   22.032887] Read of size 121 at addr ffff888101e0b000 by task kunit_try_catch/306
[   22.033202] 
[   22.033385] CPU: 1 UID: 0 PID: 306 Comm: kunit_try_catch Tainted: G    B            N  6.15.1-rc1 #1 PREEMPT(voluntary) 
[   22.033498] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.033534] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.033586] Call Trace:
[   22.033632]  <TASK>
[   22.033691]  dump_stack_lvl+0x73/0xb0
[   22.033791]  print_report+0xd1/0x650
[   22.033849]  ? __virt_addr_valid+0x1db/0x2d0
[   22.033908]  ? _copy_to_user+0x4a/0x70
[   22.033958]  ? kasan_complete_mode_report_info+0x2a/0x200
[   22.034003]  ? _copy_to_user+0x4a/0x70
[   22.034046]  kasan_report+0x141/0x180
[   22.034098]  ? _copy_to_user+0x4a/0x70
[   22.034158]  kasan_check_range+0x10c/0x1c0
[   22.034223]  __kasan_check_read+0x15/0x20
[   22.034274]  _copy_to_user+0x4a/0x70
[   22.034320]  copy_user_test_oob+0x364/0x10f0
[   22.034375]  ? __pfx_copy_user_test_oob+0x10/0x10
[   22.034418]  ? finish_task_switch.isra.0+0x153/0x700
[   22.034467]  ? __switch_to+0x5d9/0xf60
[   22.034519]  ? dequeue_task_fair+0x166/0x4e0
[   22.034593]  ? __schedule+0x10cc/0x2b30
[   22.034646]  ? __pfx_read_tsc+0x10/0x10
[   22.034678]  ? ktime_get_ts64+0x86/0x230
[   22.034709]  kunit_try_run_case+0x1a5/0x480
[   22.034738]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.034788]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   22.034817]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   22.034844]  ? __kthread_parkme+0x82/0x180
[   22.034869]  ? preempt_count_sub+0x50/0x80
[   22.034898]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.034926]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.034952]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   22.034978]  kthread+0x337/0x6f0
[   22.035000]  ? trace_preempt_on+0x20/0xc0
[   22.035027]  ? __pfx_kthread+0x10/0x10
[   22.035050]  ? _raw_spin_unlock_irq+0x47/0x80
[   22.035074]  ? calculate_sigpending+0x7b/0xa0
[   22.035102]  ? __pfx_kthread+0x10/0x10
[   22.035140]  ret_from_fork+0x41/0x80
[   22.035167]  ? __pfx_kthread+0x10/0x10
[   22.035189]  ret_from_fork_asm+0x1a/0x30
[   22.035226]  </TASK>
[   22.035243] 
[   22.048694] Allocated by task 306:
[   22.049149]  kasan_save_stack+0x45/0x70
[   22.049641]  kasan_save_track+0x18/0x40
[   22.050041]  kasan_save_alloc_info+0x3b/0x50
[   22.050374]  __kasan_kmalloc+0xb7/0xc0
[   22.050753]  __kmalloc_noprof+0x1c9/0x500
[   22.051054]  kunit_kmalloc_array+0x25/0x60
[   22.051466]  copy_user_test_oob+0xab/0x10f0
[   22.051898]  kunit_try_run_case+0x1a5/0x480
[   22.052289]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.052639]  kthread+0x337/0x6f0
[   22.053008]  ret_from_fork+0x41/0x80
[   22.053323]  ret_from_fork_asm+0x1a/0x30
[   22.053644] 
[   22.053821] The buggy address belongs to the object at ffff888101e0b000
[   22.053821]  which belongs to the cache kmalloc-128 of size 128
[   22.054704] The buggy address is located 0 bytes inside of
[   22.054704]  allocated 120-byte region [ffff888101e0b000, ffff888101e0b078)
[   22.055643] 
[   22.055982] The buggy address belongs to the physical page:
[   22.056589] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101e0b
[   22.057128] flags: 0x200000000000000(node=0|zone=2)
[   22.057589] page_type: f5(slab)
[   22.057857] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   22.058522] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   22.058970] page dumped because: kasan: bad access detected
[   22.059217] 
[   22.059351] Memory state around the buggy address:
[   22.059593]  ffff888101e0af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.060315]  ffff888101e0af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.061312] >ffff888101e0b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   22.062002]                                                                 ^
[   22.062567]  ffff888101e0b080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.063104]  ffff888101e0b100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.063585] ==================================================================