Hay
Date
July 19, 2025, 11:11 a.m.

Environment
qemu-x86_64

[   16.092454] ==================================================================
[   16.093908] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.094881] Write of size 121 at addr ffff888102f59b00 by task kunit_try_catch/303
[   16.095654] 
[   16.095766] CPU: 1 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   16.095820] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.095833] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.095857] Call Trace:
[   16.095871]  <TASK>
[   16.095893]  dump_stack_lvl+0x73/0xb0
[   16.095930]  print_report+0xd1/0x610
[   16.095956]  ? __virt_addr_valid+0x1db/0x2d0
[   16.095982]  ? _copy_from_user+0x32/0x90
[   16.096002]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.096025]  ? _copy_from_user+0x32/0x90
[   16.096045]  kasan_report+0x141/0x180
[   16.096067]  ? _copy_from_user+0x32/0x90
[   16.096093]  kasan_check_range+0x10c/0x1c0
[   16.096117]  __kasan_check_write+0x18/0x20
[   16.096137]  _copy_from_user+0x32/0x90
[   16.096364]  copy_user_test_oob+0x2be/0x10f0
[   16.096396]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.096421]  ? finish_task_switch.isra.0+0x153/0x700
[   16.096448]  ? __switch_to+0x47/0xf50
[   16.096530]  ? __schedule+0x10cc/0x2b60
[   16.096555]  ? __pfx_read_tsc+0x10/0x10
[   16.096578]  ? ktime_get_ts64+0x86/0x230
[   16.096604]  kunit_try_run_case+0x1a5/0x480
[   16.096629]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.096652]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.096678]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.096702]  ? __kthread_parkme+0x82/0x180
[   16.096725]  ? preempt_count_sub+0x50/0x80
[   16.096749]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.096774]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.096800]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.096825]  kthread+0x337/0x6f0
[   16.096845]  ? trace_preempt_on+0x20/0xc0
[   16.096871]  ? __pfx_kthread+0x10/0x10
[   16.096891]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.096913]  ? calculate_sigpending+0x7b/0xa0
[   16.096939]  ? __pfx_kthread+0x10/0x10
[   16.096962]  ret_from_fork+0x116/0x1d0
[   16.096981]  ? __pfx_kthread+0x10/0x10
[   16.097002]  ret_from_fork_asm+0x1a/0x30
[   16.097034]  </TASK>
[   16.097047] 
[   16.113222] Allocated by task 303:
[   16.113720]  kasan_save_stack+0x45/0x70
[   16.114287]  kasan_save_track+0x18/0x40
[   16.114650]  kasan_save_alloc_info+0x3b/0x50
[   16.114815]  __kasan_kmalloc+0xb7/0xc0
[   16.114951]  __kmalloc_noprof+0x1c9/0x500
[   16.115095]  kunit_kmalloc_array+0x25/0x60
[   16.115250]  copy_user_test_oob+0xab/0x10f0
[   16.115401]  kunit_try_run_case+0x1a5/0x480
[   16.116125]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.116786]  kthread+0x337/0x6f0
[   16.117260]  ret_from_fork+0x116/0x1d0
[   16.117796]  ret_from_fork_asm+0x1a/0x30
[   16.118329] 
[   16.118643] The buggy address belongs to the object at ffff888102f59b00
[   16.118643]  which belongs to the cache kmalloc-128 of size 128
[   16.120054] The buggy address is located 0 bytes inside of
[   16.120054]  allocated 120-byte region [ffff888102f59b00, ffff888102f59b78)
[   16.121246] 
[   16.121557] The buggy address belongs to the physical page:
[   16.121950] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102f59
[   16.122546] flags: 0x200000000000000(node=0|zone=2)
[   16.123126] page_type: f5(slab)
[   16.123601] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.124313] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.124858] page dumped because: kasan: bad access detected
[   16.125050] 
[   16.125126] Memory state around the buggy address:
[   16.126045]  ffff888102f59a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.126924]  ffff888102f59a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.127611] >ffff888102f59b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.127837]                                                                 ^
[   16.128057]  ffff888102f59b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.129056]  ffff888102f59c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.129889] ==================================================================