Hay
Date
July 6, 2025, 11:09 a.m.

Environment
qemu-x86_64

[   15.627102] ==================================================================
[   15.627420] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.627776] Read of size 121 at addr ffff888103a21000 by task kunit_try_catch/302
[   15.628112] 
[   15.628232] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.628288] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.628301] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.628323] Call Trace:
[   15.628338]  <TASK>
[   15.628366]  dump_stack_lvl+0x73/0xb0
[   15.628395]  print_report+0xd1/0x650
[   15.628419]  ? __virt_addr_valid+0x1db/0x2d0
[   15.628441]  ? _copy_to_user+0x3c/0x70
[   15.628470]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.628494]  ? _copy_to_user+0x3c/0x70
[   15.628513]  kasan_report+0x141/0x180
[   15.628548]  ? _copy_to_user+0x3c/0x70
[   15.628572]  kasan_check_range+0x10c/0x1c0
[   15.628597]  __kasan_check_read+0x15/0x20
[   15.628617]  _copy_to_user+0x3c/0x70
[   15.628640]  copy_user_test_oob+0x364/0x10f0
[   15.628667]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.628691]  ? finish_task_switch.isra.0+0x153/0x700
[   15.628714]  ? __switch_to+0x47/0xf50
[   15.628740]  ? __schedule+0x10cc/0x2b60
[   15.628763]  ? __pfx_read_tsc+0x10/0x10
[   15.628785]  ? ktime_get_ts64+0x86/0x230
[   15.628820]  kunit_try_run_case+0x1a5/0x480
[   15.628845]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.628868]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.628902]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.628926]  ? __kthread_parkme+0x82/0x180
[   15.628957]  ? preempt_count_sub+0x50/0x80
[   15.628981]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.629013]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.629037]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.629087]  kthread+0x337/0x6f0
[   15.629109]  ? trace_preempt_on+0x20/0xc0
[   15.629135]  ? __pfx_kthread+0x10/0x10
[   15.629159]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.629184]  ? calculate_sigpending+0x7b/0xa0
[   15.629213]  ? __pfx_kthread+0x10/0x10
[   15.629236]  ret_from_fork+0x116/0x1d0
[   15.629257]  ? __pfx_kthread+0x10/0x10
[   15.629279]  ret_from_fork_asm+0x1a/0x30
[   15.629311]  </TASK>
[   15.629325] 
[   15.642789] Allocated by task 302:
[   15.643003]  kasan_save_stack+0x45/0x70
[   15.644367]  kasan_save_track+0x18/0x40
[   15.644595]  kasan_save_alloc_info+0x3b/0x50
[   15.644764]  __kasan_kmalloc+0xb7/0xc0
[   15.645015]  __kmalloc_noprof+0x1c9/0x500
[   15.645171]  kunit_kmalloc_array+0x25/0x60
[   15.645378]  copy_user_test_oob+0xab/0x10f0
[   15.645568]  kunit_try_run_case+0x1a5/0x480
[   15.645721]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.645898]  kthread+0x337/0x6f0
[   15.646080]  ret_from_fork+0x116/0x1d0
[   15.646280]  ret_from_fork_asm+0x1a/0x30
[   15.646474] 
[   15.646857] The buggy address belongs to the object at ffff888103a21000
[   15.646857]  which belongs to the cache kmalloc-128 of size 128
[   15.647512] The buggy address is located 0 bytes inside of
[   15.647512]  allocated 120-byte region [ffff888103a21000, ffff888103a21078)
[   15.648499] 
[   15.648625] The buggy address belongs to the physical page:
[   15.648806] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103a21
[   15.649293] flags: 0x200000000000000(node=0|zone=2)
[   15.649475] page_type: f5(slab)
[   15.649647] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.649954] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.650290] page dumped because: kasan: bad access detected
[   15.650555] 
[   15.650628] Memory state around the buggy address:
[   15.651024]  ffff888103a20f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.651350]  ffff888103a20f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.651685] >ffff888103a21000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.651994]                                                                 ^
[   15.652369]  ffff888103a21080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.652615]  ffff888103a21100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.653074] ==================================================================