Hay
Date
July 23, 2025, 2:10 a.m.

Environment
qemu-x86_64

[   16.379025] ==================================================================
[   16.379725] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.380038] Write of size 121 at addr ffff888102b16500 by task kunit_try_catch/302
[   16.380787] 
[   16.381043] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7 #1 PREEMPT(voluntary) 
[   16.381209] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.381226] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.381251] Call Trace:
[   16.381265]  <TASK>
[   16.381286]  dump_stack_lvl+0x73/0xb0
[   16.381327]  print_report+0xd1/0x610
[   16.381351]  ? __virt_addr_valid+0x1db/0x2d0
[   16.381376]  ? _copy_from_user+0x32/0x90
[   16.381396]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.381419]  ? _copy_from_user+0x32/0x90
[   16.381440]  kasan_report+0x141/0x180
[   16.381464]  ? _copy_from_user+0x32/0x90
[   16.381489]  kasan_check_range+0x10c/0x1c0
[   16.381515]  __kasan_check_write+0x18/0x20
[   16.381535]  _copy_from_user+0x32/0x90
[   16.381557]  copy_user_test_oob+0x2be/0x10f0
[   16.381584]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.381607]  ? finish_task_switch.isra.0+0x153/0x700
[   16.381631]  ? __switch_to+0x47/0xf50
[   16.381659]  ? __schedule+0x10c6/0x2b60
[   16.381683]  ? __pfx_read_tsc+0x10/0x10
[   16.381704]  ? ktime_get_ts64+0x86/0x230
[   16.381730]  kunit_try_run_case+0x1a5/0x480
[   16.381755]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.381779]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.381803]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.381837]  ? __kthread_parkme+0x82/0x180
[   16.381860]  ? preempt_count_sub+0x50/0x80
[   16.381884]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.381909]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.381934]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.381959]  kthread+0x337/0x6f0
[   16.381980]  ? trace_preempt_on+0x20/0xc0
[   16.382004]  ? __pfx_kthread+0x10/0x10
[   16.382025]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.382048]  ? calculate_sigpending+0x7b/0xa0
[   16.382074]  ? __pfx_kthread+0x10/0x10
[   16.382104]  ret_from_fork+0x116/0x1d0
[   16.382126]  ? __pfx_kthread+0x10/0x10
[   16.382148]  ret_from_fork_asm+0x1a/0x30
[   16.382179]  </TASK>
[   16.382193] 
[   16.391654] Allocated by task 302:
[   16.391828]  kasan_save_stack+0x45/0x70
[   16.392000]  kasan_save_track+0x18/0x40
[   16.392157]  kasan_save_alloc_info+0x3b/0x50
[   16.392424]  __kasan_kmalloc+0xb7/0xc0
[   16.392592]  __kmalloc_noprof+0x1c9/0x500
[   16.392778]  kunit_kmalloc_array+0x25/0x60
[   16.392964]  copy_user_test_oob+0xab/0x10f0
[   16.393234]  kunit_try_run_case+0x1a5/0x480
[   16.393454]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.393671]  kthread+0x337/0x6f0
[   16.393841]  ret_from_fork+0x116/0x1d0
[   16.394003]  ret_from_fork_asm+0x1a/0x30
[   16.394231] 
[   16.394307] The buggy address belongs to the object at ffff888102b16500
[   16.394307]  which belongs to the cache kmalloc-128 of size 128
[   16.394666] The buggy address is located 0 bytes inside of
[   16.394666]  allocated 120-byte region [ffff888102b16500, ffff888102b16578)
[   16.395349] 
[   16.395450] The buggy address belongs to the physical page:
[   16.395652] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b16
[   16.395950] flags: 0x200000000000000(node=0|zone=2)
[   16.396321] page_type: f5(slab)
[   16.396488] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.396751] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.397132] page dumped because: kasan: bad access detected
[   16.397353] 
[   16.397453] Memory state around the buggy address:
[   16.397664]  ffff888102b16400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.397926]  ffff888102b16480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.398336] >ffff888102b16500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.398620]                                                                 ^
[   16.398916]  ffff888102b16580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.399245]  ffff888102b16600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.399547] ==================================================================