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

Environment
qemu-x86_64

[   21.994295] ==================================================================
[   21.995204] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   21.995820] Write of size 121 at addr ffff888101e0b000 by task kunit_try_catch/306
[   21.996420] 
[   21.996670] CPU: 1 UID: 0 PID: 306 Comm: kunit_try_catch Tainted: G    B            N  6.15.1-rc1 #1 PREEMPT(voluntary) 
[   21.996837] Tainted: [B]=BAD_PAGE, [N]=TEST
[   21.996878] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   21.996926] Call Trace:
[   21.996958]  <TASK>
[   21.997007]  dump_stack_lvl+0x73/0xb0
[   21.997082]  print_report+0xd1/0x650
[   21.997133]  ? __virt_addr_valid+0x1db/0x2d0
[   21.997192]  ? _copy_from_user+0x32/0x90
[   21.997242]  ? kasan_complete_mode_report_info+0x2a/0x200
[   21.997300]  ? _copy_from_user+0x32/0x90
[   21.997350]  kasan_report+0x141/0x180
[   21.997407]  ? _copy_from_user+0x32/0x90
[   21.997470]  kasan_check_range+0x10c/0x1c0
[   21.997524]  __kasan_check_write+0x18/0x20
[   21.997574]  _copy_from_user+0x32/0x90
[   21.997614]  copy_user_test_oob+0x2be/0x10f0
[   21.997660]  ? __pfx_copy_user_test_oob+0x10/0x10
[   21.997698]  ? finish_task_switch.isra.0+0x153/0x700
[   21.997762]  ? __switch_to+0x5d9/0xf60
[   21.997811]  ? dequeue_task_fair+0x166/0x4e0
[   21.997955]  ? __schedule+0x10cc/0x2b30
[   21.998057]  ? __pfx_read_tsc+0x10/0x10
[   21.998114]  ? ktime_get_ts64+0x86/0x230
[   21.998172]  kunit_try_run_case+0x1a5/0x480
[   21.998231]  ? __pfx_kunit_try_run_case+0x10/0x10
[   21.998282]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   21.998337]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   21.998376]  ? __kthread_parkme+0x82/0x180
[   21.998404]  ? preempt_count_sub+0x50/0x80
[   21.998431]  ? __pfx_kunit_try_run_case+0x10/0x10
[   21.998458]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   21.998486]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   21.998512]  kthread+0x337/0x6f0
[   21.998533]  ? trace_preempt_on+0x20/0xc0
[   21.998561]  ? __pfx_kthread+0x10/0x10
[   21.998583]  ? _raw_spin_unlock_irq+0x47/0x80
[   21.998607]  ? calculate_sigpending+0x7b/0xa0
[   21.998634]  ? __pfx_kthread+0x10/0x10
[   21.998656]  ret_from_fork+0x41/0x80
[   21.998680]  ? __pfx_kthread+0x10/0x10
[   21.998702]  ret_from_fork_asm+0x1a/0x30
[   21.998738]  </TASK>
[   21.998779] 
[   22.012151] Allocated by task 306:
[   22.012629]  kasan_save_stack+0x45/0x70
[   22.012836]  kasan_save_track+0x18/0x40
[   22.012954]  kasan_save_alloc_info+0x3b/0x50
[   22.013074]  __kasan_kmalloc+0xb7/0xc0
[   22.013290]  __kmalloc_noprof+0x1c9/0x500
[   22.014007]  kunit_kmalloc_array+0x25/0x60
[   22.014504]  copy_user_test_oob+0xab/0x10f0
[   22.014962]  kunit_try_run_case+0x1a5/0x480
[   22.015411]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.015812]  kthread+0x337/0x6f0
[   22.016207]  ret_from_fork+0x41/0x80
[   22.016527]  ret_from_fork_asm+0x1a/0x30
[   22.016940] 
[   22.017173] The buggy address belongs to the object at ffff888101e0b000
[   22.017173]  which belongs to the cache kmalloc-128 of size 128
[   22.018046] The buggy address is located 0 bytes inside of
[   22.018046]  allocated 120-byte region [ffff888101e0b000, ffff888101e0b078)
[   22.019058] 
[   22.019245] The buggy address belongs to the physical page:
[   22.019830] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101e0b
[   22.020333] flags: 0x200000000000000(node=0|zone=2)
[   22.020790] page_type: f5(slab)
[   22.020984] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   22.021683] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   22.022179] page dumped because: kasan: bad access detected
[   22.022659] 
[   22.022875] Memory state around the buggy address:
[   22.023268]  ffff888101e0af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.023888]  ffff888101e0af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.024440] >ffff888101e0b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   22.025008]                                                                 ^
[   22.025474]  ffff888101e0b080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.026053]  ffff888101e0b100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.026460] ==================================================================