Hay
Date
July 2, 2025, 11:09 p.m.

Environment
qemu-x86_64

[   15.366211] ==================================================================
[   15.367735] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   15.368522] Write of size 121 at addr ffff888102c8ba00 by task kunit_try_catch/304
[   15.369420] 
[   15.369532] CPU: 1 UID: 0 PID: 304 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.369597] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.369612] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.369637] Call Trace:
[   15.369653]  <TASK>
[   15.369676]  dump_stack_lvl+0x73/0xb0
[   15.369713]  print_report+0xd1/0x650
[   15.369741]  ? __virt_addr_valid+0x1db/0x2d0
[   15.369768]  ? _copy_from_user+0x32/0x90
[   15.369787]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.369812]  ? _copy_from_user+0x32/0x90
[   15.369831]  kasan_report+0x141/0x180
[   15.369855]  ? _copy_from_user+0x32/0x90
[   15.369879]  kasan_check_range+0x10c/0x1c0
[   15.369904]  __kasan_check_write+0x18/0x20
[   15.369924]  _copy_from_user+0x32/0x90
[   15.369946]  copy_user_test_oob+0x2be/0x10f0
[   15.369972]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.369995]  ? finish_task_switch.isra.0+0x153/0x700
[   15.370020]  ? __switch_to+0x47/0xf50
[   15.370049]  ? __schedule+0x10cc/0x2b60
[   15.370073]  ? __pfx_read_tsc+0x10/0x10
[   15.370096]  ? ktime_get_ts64+0x86/0x230
[   15.370122]  kunit_try_run_case+0x1a5/0x480
[   15.370147]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.370170]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.370195]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.370218]  ? __kthread_parkme+0x82/0x180
[   15.370242]  ? preempt_count_sub+0x50/0x80
[   15.370266]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.370291]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.370315]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.370338]  kthread+0x337/0x6f0
[   15.370371]  ? trace_preempt_on+0x20/0xc0
[   15.370397]  ? __pfx_kthread+0x10/0x10
[   15.370419]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.370441]  ? calculate_sigpending+0x7b/0xa0
[   15.370467]  ? __pfx_kthread+0x10/0x10
[   15.370490]  ret_from_fork+0x116/0x1d0
[   15.370509]  ? __pfx_kthread+0x10/0x10
[   15.370531]  ret_from_fork_asm+0x1a/0x30
[   15.370564]  </TASK>
[   15.370578] 
[   15.385787] Allocated by task 304:
[   15.386183]  kasan_save_stack+0x45/0x70
[   15.386590]  kasan_save_track+0x18/0x40
[   15.387002]  kasan_save_alloc_info+0x3b/0x50
[   15.387177]  __kasan_kmalloc+0xb7/0xc0
[   15.387520]  __kmalloc_noprof+0x1c9/0x500
[   15.387968]  kunit_kmalloc_array+0x25/0x60
[   15.388412]  copy_user_test_oob+0xab/0x10f0
[   15.388695]  kunit_try_run_case+0x1a5/0x480
[   15.389139]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.389492]  kthread+0x337/0x6f0
[   15.389647]  ret_from_fork+0x116/0x1d0
[   15.389989]  ret_from_fork_asm+0x1a/0x30
[   15.390526] 
[   15.390640] The buggy address belongs to the object at ffff888102c8ba00
[   15.390640]  which belongs to the cache kmalloc-128 of size 128
[   15.391594] The buggy address is located 0 bytes inside of
[   15.391594]  allocated 120-byte region [ffff888102c8ba00, ffff888102c8ba78)
[   15.392624] 
[   15.392806] The buggy address belongs to the physical page:
[   15.393313] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c8b
[   15.393962] flags: 0x200000000000000(node=0|zone=2)
[   15.394223] page_type: f5(slab)
[   15.394564] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.395179] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.395780] page dumped because: kasan: bad access detected
[   15.396259] 
[   15.396337] Memory state around the buggy address:
[   15.396655]  ffff888102c8b900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.397367]  ffff888102c8b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.397968] >ffff888102c8ba00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.398637]                                                                 ^
[   15.398927]  ffff888102c8ba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.399402]  ffff888102c8bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.399656] ==================================================================