Hay
Date
July 10, 2025, 11:10 p.m.

Environment
qemu-x86_64

[   16.602265] ==================================================================
[   16.603032] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.603796] Write of size 121 at addr ffff888103a2f000 by task kunit_try_catch/303
[   16.604148] 
[   16.604463] CPU: 0 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   16.604670] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.604685] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.604709] Call Trace:
[   16.604724]  <TASK>
[   16.604746]  dump_stack_lvl+0x73/0xb0
[   16.604781]  print_report+0xd1/0x650
[   16.604807]  ? __virt_addr_valid+0x1db/0x2d0
[   16.604833]  ? _copy_from_user+0x32/0x90
[   16.604853]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.604879]  ? _copy_from_user+0x32/0x90
[   16.604900]  kasan_report+0x141/0x180
[   16.604922]  ? _copy_from_user+0x32/0x90
[   16.604947]  kasan_check_range+0x10c/0x1c0
[   16.604972]  __kasan_check_write+0x18/0x20
[   16.604993]  _copy_from_user+0x32/0x90
[   16.605015]  copy_user_test_oob+0x2be/0x10f0
[   16.605042]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.605067]  ? finish_task_switch.isra.0+0x153/0x700
[   16.605092]  ? __switch_to+0x47/0xf50
[   16.605119]  ? __schedule+0x10cc/0x2b60
[   16.605143]  ? __pfx_read_tsc+0x10/0x10
[   16.605166]  ? ktime_get_ts64+0x86/0x230
[   16.605192]  kunit_try_run_case+0x1a5/0x480
[   16.605217]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.605241]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.605266]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.605292]  ? __kthread_parkme+0x82/0x180
[   16.605315]  ? preempt_count_sub+0x50/0x80
[   16.605446]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.605480]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.605508]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.605535]  kthread+0x337/0x6f0
[   16.605555]  ? trace_preempt_on+0x20/0xc0
[   16.605581]  ? __pfx_kthread+0x10/0x10
[   16.605603]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.605627]  ? calculate_sigpending+0x7b/0xa0
[   16.605653]  ? __pfx_kthread+0x10/0x10
[   16.605676]  ret_from_fork+0x116/0x1d0
[   16.605696]  ? __pfx_kthread+0x10/0x10
[   16.605718]  ret_from_fork_asm+0x1a/0x30
[   16.605750]  </TASK>
[   16.605763] 
[   16.617446] Allocated by task 303:
[   16.617843]  kasan_save_stack+0x45/0x70
[   16.618309]  kasan_save_track+0x18/0x40
[   16.618868]  kasan_save_alloc_info+0x3b/0x50
[   16.619417]  __kasan_kmalloc+0xb7/0xc0
[   16.619567]  __kmalloc_noprof+0x1c9/0x500
[   16.619983]  kunit_kmalloc_array+0x25/0x60
[   16.620192]  copy_user_test_oob+0xab/0x10f0
[   16.620644]  kunit_try_run_case+0x1a5/0x480
[   16.620858]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.621191]  kthread+0x337/0x6f0
[   16.621321]  ret_from_fork+0x116/0x1d0
[   16.621607]  ret_from_fork_asm+0x1a/0x30
[   16.622113] 
[   16.622211] The buggy address belongs to the object at ffff888103a2f000
[   16.622211]  which belongs to the cache kmalloc-128 of size 128
[   16.622990] The buggy address is located 0 bytes inside of
[   16.622990]  allocated 120-byte region [ffff888103a2f000, ffff888103a2f078)
[   16.623794] 
[   16.624009] The buggy address belongs to the physical page:
[   16.624223] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103a2f
[   16.624805] flags: 0x200000000000000(node=0|zone=2)
[   16.625149] page_type: f5(slab)
[   16.625490] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.625998] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.626467] page dumped because: kasan: bad access detected
[   16.626913] 
[   16.627006] Memory state around the buggy address:
[   16.627235]  ffff888103a2ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.627801]  ffff888103a2ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.628117] >ffff888103a2f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.628768]                                                                 ^
[   16.629185]  ffff888103a2f080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.629772]  ffff888103a2f100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.630234] ==================================================================