Hay
Date
May 12, 2025, 6:12 p.m.

Environment
qemu-x86_64

[   16.268205] ==================================================================
[   16.268587] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x4a/0x70
[   16.268927] Read of size 121 at addr ffff888102adde00 by task kunit_try_catch/293
[   16.269284] 
[   16.269384] CPU: 0 UID: 0 PID: 293 Comm: kunit_try_catch Tainted: G    B            N 6.14.7-rc1 #1
[   16.269433] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.269447] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.269470] Call Trace:
[   16.269492]  <TASK>
[   16.269515]  dump_stack_lvl+0x73/0xb0
[   16.269544]  print_report+0xd1/0x650
[   16.269568]  ? __virt_addr_valid+0x1db/0x2d0
[   16.269591]  ? _copy_to_user+0x4a/0x70
[   16.269612]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.269639]  ? _copy_to_user+0x4a/0x70
[   16.269660]  kasan_report+0x140/0x180
[   16.269682]  ? _copy_to_user+0x4a/0x70
[   16.269707]  kasan_check_range+0x10c/0x1c0
[   16.269732]  __kasan_check_read+0x15/0x20
[   16.269761]  _copy_to_user+0x4a/0x70
[   16.269783]  copy_user_test_oob+0x365/0x10f0
[   16.269809]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.269832]  ? finish_task_switch.isra.0+0x153/0x700
[   16.269868]  ? __switch_to+0x5d9/0xf60
[   16.269896]  ? __schedule+0xce8/0x2840
[   16.269923]  ? __pfx_read_tsc+0x10/0x10
[   16.269946]  ? ktime_get_ts64+0x86/0x230
[   16.269973]  kunit_try_run_case+0x1a6/0x480
[   16.269997]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.270019]  ? _raw_spin_lock_irqsave+0xa2/0x110
[   16.270041]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.270067]  ? __kthread_parkme+0x82/0x160
[   16.270092]  ? preempt_count_sub+0x50/0x80
[   16.270116]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.270140]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.270167]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.270194]  kthread+0x324/0x6e0
[   16.270216]  ? trace_preempt_on+0x20/0xc0
[   16.270241]  ? __pfx_kthread+0x10/0x10
[   16.270264]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.270304]  ? calculate_sigpending+0x7b/0xa0
[   16.270329]  ? __pfx_kthread+0x10/0x10
[   16.270353]  ret_from_fork+0x41/0x80
[   16.270373]  ? __pfx_kthread+0x10/0x10
[   16.270396]  ret_from_fork_asm+0x1a/0x30
[   16.270429]  </TASK>
[   16.270442] 
[   16.277447] Allocated by task 293:
[   16.277632]  kasan_save_stack+0x45/0x70
[   16.277854]  kasan_save_track+0x18/0x40
[   16.278057]  kasan_save_alloc_info+0x3b/0x50
[   16.278280]  __kasan_kmalloc+0xb7/0xc0
[   16.278460]  __kmalloc_noprof+0x1ca/0x500
[   16.278603]  kunit_kmalloc_array+0x25/0x60
[   16.278811]  copy_user_test_oob+0xac/0x10f0
[   16.279029]  kunit_try_run_case+0x1a6/0x480
[   16.279244]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.279468]  kthread+0x324/0x6e0
[   16.279642]  ret_from_fork+0x41/0x80
[   16.279810]  ret_from_fork_asm+0x1a/0x30
[   16.280012] 
[   16.280141] The buggy address belongs to the object at ffff888102adde00
[   16.280141]  which belongs to the cache kmalloc-128 of size 128
[   16.280591] The buggy address is located 0 bytes inside of
[   16.280591]  allocated 120-byte region [ffff888102adde00, ffff888102adde78)
[   16.281058] 
[   16.281157] The buggy address belongs to the physical page:
[   16.281402] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102add
[   16.281738] flags: 0x200000000000000(node=0|zone=2)
[   16.281935] page_type: f5(slab)
[   16.282159] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.282471] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.282762] page dumped because: kasan: bad access detected
[   16.283009] 
[   16.283128] Memory state around the buggy address:
[   16.283323]  ffff888102addd00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.283605]  ffff888102addd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.283891] >ffff888102adde00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.284167]                                                                 ^
[   16.284384]  ffff888102adde80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.284602]  ffff888102addf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.284816] ==================================================================