Hay
Date
July 3, 2025, 6:13 p.m.

Environment
qemu-x86_64

[   15.432878] ==================================================================
[   15.433244] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.433505] Read of size 121 at addr ffff8881029dbd00 by task kunit_try_catch/303
[   15.433801] 
[   15.433910] CPU: 0 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.433954] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.433968] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.433988] Call Trace:
[   15.434002]  <TASK>
[   15.434016]  dump_stack_lvl+0x73/0xb0
[   15.434043]  print_report+0xd1/0x650
[   15.434068]  ? __virt_addr_valid+0x1db/0x2d0
[   15.434090]  ? _copy_to_user+0x3c/0x70
[   15.434123]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.434146]  ? _copy_to_user+0x3c/0x70
[   15.434166]  kasan_report+0x141/0x180
[   15.434189]  ? _copy_to_user+0x3c/0x70
[   15.434213]  kasan_check_range+0x10c/0x1c0
[   15.434237]  __kasan_check_read+0x15/0x20
[   15.434257]  _copy_to_user+0x3c/0x70
[   15.434277]  copy_user_test_oob+0x364/0x10f0
[   15.434304]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.434327]  ? finish_task_switch.isra.0+0x153/0x700
[   15.434350]  ? __switch_to+0x47/0xf50
[   15.434374]  ? __schedule+0x10cc/0x2b60
[   15.434398]  ? __pfx_read_tsc+0x10/0x10
[   15.434432]  ? ktime_get_ts64+0x86/0x230
[   15.434457]  kunit_try_run_case+0x1a5/0x480
[   15.434481]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.434504]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.434528]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.434551]  ? __kthread_parkme+0x82/0x180
[   15.434573]  ? preempt_count_sub+0x50/0x80
[   15.434597]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.434622]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.434645]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.434670]  kthread+0x337/0x6f0
[   15.434690]  ? trace_preempt_on+0x20/0xc0
[   15.434715]  ? __pfx_kthread+0x10/0x10
[   15.434736]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.434757]  ? calculate_sigpending+0x7b/0xa0
[   15.434782]  ? __pfx_kthread+0x10/0x10
[   15.434804]  ret_from_fork+0x116/0x1d0
[   15.434823]  ? __pfx_kthread+0x10/0x10
[   15.434844]  ret_from_fork_asm+0x1a/0x30
[   15.434875]  </TASK>
[   15.434887] 
[   15.444863] Allocated by task 303:
[   15.445054]  kasan_save_stack+0x45/0x70
[   15.445262]  kasan_save_track+0x18/0x40
[   15.445704]  kasan_save_alloc_info+0x3b/0x50
[   15.445869]  __kasan_kmalloc+0xb7/0xc0
[   15.446172]  __kmalloc_noprof+0x1c9/0x500
[   15.446490]  kunit_kmalloc_array+0x25/0x60
[   15.446670]  copy_user_test_oob+0xab/0x10f0
[   15.446979]  kunit_try_run_case+0x1a5/0x480
[   15.447184]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.447533]  kthread+0x337/0x6f0
[   15.447709]  ret_from_fork+0x116/0x1d0
[   15.447888]  ret_from_fork_asm+0x1a/0x30
[   15.448065] 
[   15.448171] The buggy address belongs to the object at ffff8881029dbd00
[   15.448171]  which belongs to the cache kmalloc-128 of size 128
[   15.448887] The buggy address is located 0 bytes inside of
[   15.448887]  allocated 120-byte region [ffff8881029dbd00, ffff8881029dbd78)
[   15.449598] 
[   15.449766] The buggy address belongs to the physical page:
[   15.449997] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1029db
[   15.450495] flags: 0x200000000000000(node=0|zone=2)
[   15.450796] page_type: f5(slab)
[   15.450969] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.451451] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.451770] page dumped because: kasan: bad access detected
[   15.452008] 
[   15.452088] Memory state around the buggy address:
[   15.452316]  ffff8881029dbc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.452860]  ffff8881029dbc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.453222] >ffff8881029dbd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.453752]                                                                 ^
[   15.454052]  ffff8881029dbd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.454473]  ffff8881029dbe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.454839] ==================================================================