Hay
Date
July 23, 2025, 2:10 a.m.

Environment
qemu-x86_64

[   16.402714] ==================================================================
[   16.403036] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   16.403310] Read of size 121 at addr ffff888102b16500 by task kunit_try_catch/302
[   16.403640] 
[   16.403739] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7 #1 PREEMPT(voluntary) 
[   16.403785] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.403799] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.403834] Call Trace:
[   16.403852]  <TASK>
[   16.403869]  dump_stack_lvl+0x73/0xb0
[   16.403897]  print_report+0xd1/0x610
[   16.403921]  ? __virt_addr_valid+0x1db/0x2d0
[   16.403944]  ? _copy_to_user+0x3c/0x70
[   16.403964]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.403987]  ? _copy_to_user+0x3c/0x70
[   16.404008]  kasan_report+0x141/0x180
[   16.404031]  ? _copy_to_user+0x3c/0x70
[   16.404055]  kasan_check_range+0x10c/0x1c0
[   16.404079]  __kasan_check_read+0x15/0x20
[   16.404112]  _copy_to_user+0x3c/0x70
[   16.404133]  copy_user_test_oob+0x364/0x10f0
[   16.404161]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.404184]  ? finish_task_switch.isra.0+0x153/0x700
[   16.404207]  ? __switch_to+0x47/0xf50
[   16.404232]  ? __schedule+0x10c6/0x2b60
[   16.404256]  ? __pfx_read_tsc+0x10/0x10
[   16.404277]  ? ktime_get_ts64+0x86/0x230
[   16.404302]  kunit_try_run_case+0x1a5/0x480
[   16.404326]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.404350]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.404375]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.404399]  ? __kthread_parkme+0x82/0x180
[   16.404421]  ? preempt_count_sub+0x50/0x80
[   16.404445]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.404471]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.404496]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.404522]  kthread+0x337/0x6f0
[   16.404544]  ? trace_preempt_on+0x20/0xc0
[   16.404570]  ? __pfx_kthread+0x10/0x10
[   16.404593]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.404618]  ? calculate_sigpending+0x7b/0xa0
[   16.404645]  ? __pfx_kthread+0x10/0x10
[   16.404669]  ret_from_fork+0x116/0x1d0
[   16.404688]  ? __pfx_kthread+0x10/0x10
[   16.404711]  ret_from_fork_asm+0x1a/0x30
[   16.404743]  </TASK>
[   16.404754] 
[   16.412120] Allocated by task 302:
[   16.412278]  kasan_save_stack+0x45/0x70
[   16.412425]  kasan_save_track+0x18/0x40
[   16.412564]  kasan_save_alloc_info+0x3b/0x50
[   16.412715]  __kasan_kmalloc+0xb7/0xc0
[   16.412914]  __kmalloc_noprof+0x1c9/0x500
[   16.413111]  kunit_kmalloc_array+0x25/0x60
[   16.413363]  copy_user_test_oob+0xab/0x10f0
[   16.413557]  kunit_try_run_case+0x1a5/0x480
[   16.413706]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.413895]  kthread+0x337/0x6f0
[   16.414028]  ret_from_fork+0x116/0x1d0
[   16.414383]  ret_from_fork_asm+0x1a/0x30
[   16.414584] 
[   16.414682] The buggy address belongs to the object at ffff888102b16500
[   16.414682]  which belongs to the cache kmalloc-128 of size 128
[   16.415234] The buggy address is located 0 bytes inside of
[   16.415234]  allocated 120-byte region [ffff888102b16500, ffff888102b16578)
[   16.415595] 
[   16.415670] The buggy address belongs to the physical page:
[   16.415861] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b16
[   16.416209] flags: 0x200000000000000(node=0|zone=2)
[   16.416660] page_type: f5(slab)
[   16.416839] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.417186] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.417417] page dumped because: kasan: bad access detected
[   16.417593] 
[   16.417664] Memory state around the buggy address:
[   16.418102]  ffff888102b16400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.418428]  ffff888102b16480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.418746] >ffff888102b16500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.419073]                                                                 ^
[   16.419362]  ffff888102b16580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.419636]  ffff888102b16600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.419929] ==================================================================