Hay
Date
July 17, 2025, 11:10 a.m.

Environment
qemu-x86_64

[   17.178521] ==================================================================
[   17.178860] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   17.179146] Read of size 121 at addr ffff8881025ccc00 by task kunit_try_catch/302
[   17.179372] 
[   17.179523] CPU: 1 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   17.179578] Tainted: [B]=BAD_PAGE, [N]=TEST
[   17.179592] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   17.179614] Call Trace:
[   17.179629]  <TASK>
[   17.179644]  dump_stack_lvl+0x73/0xb0
[   17.179673]  print_report+0xd1/0x610
[   17.179696]  ? __virt_addr_valid+0x1db/0x2d0
[   17.179721]  ? _copy_to_user+0x3c/0x70
[   17.179741]  ? kasan_complete_mode_report_info+0x2a/0x200
[   17.179767]  ? _copy_to_user+0x3c/0x70
[   17.179788]  kasan_report+0x141/0x180
[   17.179811]  ? _copy_to_user+0x3c/0x70
[   17.179836]  kasan_check_range+0x10c/0x1c0
[   17.179862]  __kasan_check_read+0x15/0x20
[   17.179883]  _copy_to_user+0x3c/0x70
[   17.179904]  copy_user_test_oob+0x364/0x10f0
[   17.179931]  ? __pfx_copy_user_test_oob+0x10/0x10
[   17.179959]  ? __kasan_check_write+0x18/0x20
[   17.179980]  ? queued_spin_lock_slowpath+0x116/0xb40
[   17.180006]  ? irqentry_exit+0x2a/0x60
[   17.180028]  ? sysvec_apic_timer_interrupt+0x50/0x90
[   17.180055]  ? trace_hardirqs_on+0x37/0xe0
[   17.180085]  ? __pfx_read_tsc+0x10/0x10
[   17.180106]  ? ktime_get_ts64+0x86/0x230
[   17.180131]  kunit_try_run_case+0x1a5/0x480
[   17.180157]  ? __pfx_kunit_try_run_case+0x10/0x10
[   17.180184]  ? queued_spin_lock_slowpath+0x116/0xb40
[   17.180209]  ? __kthread_parkme+0x82/0x180
[   17.180230]  ? preempt_count_sub+0x50/0x80
[   17.180255]  ? __pfx_kunit_try_run_case+0x10/0x10
[   17.180282]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   17.180308]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   17.180335]  kthread+0x337/0x6f0
[   17.180355]  ? trace_preempt_on+0x20/0xc0
[   17.180380]  ? __pfx_kthread+0x10/0x10
[   17.180402]  ? _raw_spin_unlock_irq+0x47/0x80
[   17.180439]  ? calculate_sigpending+0x7b/0xa0
[   17.180464]  ? __pfx_kthread+0x10/0x10
[   17.180487]  ret_from_fork+0x116/0x1d0
[   17.180507]  ? __pfx_kthread+0x10/0x10
[   17.180529]  ret_from_fork_asm+0x1a/0x30
[   17.180571]  </TASK>
[   17.180582] 
[   17.187858] Allocated by task 302:
[   17.188038]  kasan_save_stack+0x45/0x70
[   17.188227]  kasan_save_track+0x18/0x40
[   17.188400]  kasan_save_alloc_info+0x3b/0x50
[   17.188620]  __kasan_kmalloc+0xb7/0xc0
[   17.188803]  __kmalloc_noprof+0x1c9/0x500
[   17.188971]  kunit_kmalloc_array+0x25/0x60
[   17.189182]  copy_user_test_oob+0xab/0x10f0
[   17.189358]  kunit_try_run_case+0x1a5/0x480
[   17.189630]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   17.189847]  kthread+0x337/0x6f0
[   17.189994]  ret_from_fork+0x116/0x1d0
[   17.190164]  ret_from_fork_asm+0x1a/0x30
[   17.190354] 
[   17.190427] The buggy address belongs to the object at ffff8881025ccc00
[   17.190427]  which belongs to the cache kmalloc-128 of size 128
[   17.190799] The buggy address is located 0 bytes inside of
[   17.190799]  allocated 120-byte region [ffff8881025ccc00, ffff8881025ccc78)
[   17.191273] 
[   17.191423] The buggy address belongs to the physical page:
[   17.191682] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1025cc
[   17.192030] flags: 0x200000000000000(node=0|zone=2)
[   17.192201] page_type: f5(slab)
[   17.192323] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   17.192945] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   17.193242] page dumped because: kasan: bad access detected
[   17.193507] 
[   17.193587] Memory state around the buggy address:
[   17.193744]  ffff8881025ccb00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   17.194061]  ffff8881025ccb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.194375] >ffff8881025ccc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   17.194702]                                                                 ^
[   17.194961]  ffff8881025ccc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.195246]  ffff8881025ccd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.195543] ==================================================================