Hay
Date
July 19, 2025, 11:12 p.m.

Environment
qemu-x86_64

[   15.985141] ==================================================================
[   15.985479] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.985738] Read of size 121 at addr ffff888102fd1e00 by task kunit_try_catch/303
[   15.986041] 
[   15.986154] CPU: 0 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   15.986197] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.986209] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.986230] Call Trace:
[   15.986243]  <TASK>
[   15.986259]  dump_stack_lvl+0x73/0xb0
[   15.986285]  print_report+0xd1/0x610
[   15.986308]  ? __virt_addr_valid+0x1db/0x2d0
[   15.986330]  ? _copy_to_user+0x3c/0x70
[   15.986349]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.986372]  ? _copy_to_user+0x3c/0x70
[   15.986391]  kasan_report+0x141/0x180
[   15.986422]  ? _copy_to_user+0x3c/0x70
[   15.986445]  kasan_check_range+0x10c/0x1c0
[   15.986469]  __kasan_check_read+0x15/0x20
[   15.986488]  _copy_to_user+0x3c/0x70
[   15.986508]  copy_user_test_oob+0x364/0x10f0
[   15.986534]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.986557]  ? finish_task_switch.isra.0+0x153/0x700
[   15.986579]  ? __switch_to+0x47/0xf50
[   15.986604]  ? __schedule+0x10cc/0x2b60
[   15.986626]  ? __pfx_read_tsc+0x10/0x10
[   15.986648]  ? ktime_get_ts64+0x86/0x230
[   15.986672]  kunit_try_run_case+0x1a5/0x480
[   15.986696]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.986718]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.986743]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.986766]  ? __kthread_parkme+0x82/0x180
[   15.986787]  ? preempt_count_sub+0x50/0x80
[   15.986810]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.986835]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.986858]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.986882]  kthread+0x337/0x6f0
[   15.986902]  ? trace_preempt_on+0x20/0xc0
[   15.986925]  ? __pfx_kthread+0x10/0x10
[   15.986946]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.986968]  ? calculate_sigpending+0x7b/0xa0
[   15.986991]  ? __pfx_kthread+0x10/0x10
[   15.987024]  ret_from_fork+0x116/0x1d0
[   15.987044]  ? __pfx_kthread+0x10/0x10
[   15.987065]  ret_from_fork_asm+0x1a/0x30
[   15.987096]  </TASK>
[   15.987106] 
[   15.994254] Allocated by task 303:
[   15.994423]  kasan_save_stack+0x45/0x70
[   15.994596]  kasan_save_track+0x18/0x40
[   15.994764]  kasan_save_alloc_info+0x3b/0x50
[   15.994913]  __kasan_kmalloc+0xb7/0xc0
[   15.995058]  __kmalloc_noprof+0x1c9/0x500
[   15.995251]  kunit_kmalloc_array+0x25/0x60
[   15.995459]  copy_user_test_oob+0xab/0x10f0
[   15.995669]  kunit_try_run_case+0x1a5/0x480
[   15.995922]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.996109]  kthread+0x337/0x6f0
[   15.996229]  ret_from_fork+0x116/0x1d0
[   15.996385]  ret_from_fork_asm+0x1a/0x30
[   15.996594] 
[   15.996688] The buggy address belongs to the object at ffff888102fd1e00
[   15.996688]  which belongs to the cache kmalloc-128 of size 128
[   15.997249] The buggy address is located 0 bytes inside of
[   15.997249]  allocated 120-byte region [ffff888102fd1e00, ffff888102fd1e78)
[   15.997754] 
[   15.997843] The buggy address belongs to the physical page:
[   15.998060] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102fd1
[   15.998383] flags: 0x200000000000000(node=0|zone=2)
[   15.998602] page_type: f5(slab)
[   15.998757] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.999047] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.999275] page dumped because: kasan: bad access detected
[   15.999581] 
[   15.999681] Memory state around the buggy address:
[   15.999902]  ffff888102fd1d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.000233]  ffff888102fd1d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.000547] >ffff888102fd1e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.000766]                                                                 ^
[   16.001100]  ffff888102fd1e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.001438]  ffff888102fd1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.001714] ==================================================================