Hay
Date
July 18, 2025, 11:11 p.m.

Environment
qemu-x86_64

[   16.285180] ==================================================================
[   16.285527] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   16.285818] Read of size 121 at addr ffff8881039ee400 by task kunit_try_catch/304
[   16.286141] 
[   16.286293] CPU: 1 UID: 0 PID: 304 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   16.286348] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.286360] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.286381] Call Trace:
[   16.286395]  <TASK>
[   16.286411]  dump_stack_lvl+0x73/0xb0
[   16.286441]  print_report+0xd1/0x610
[   16.286464]  ? __virt_addr_valid+0x1db/0x2d0
[   16.286487]  ? _copy_to_user+0x3c/0x70
[   16.286506]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.286541]  ? _copy_to_user+0x3c/0x70
[   16.286570]  kasan_report+0x141/0x180
[   16.286593]  ? _copy_to_user+0x3c/0x70
[   16.286628]  kasan_check_range+0x10c/0x1c0
[   16.286652]  __kasan_check_read+0x15/0x20
[   16.286672]  _copy_to_user+0x3c/0x70
[   16.286692]  copy_user_test_oob+0x364/0x10f0
[   16.286719]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.286745]  ? __kasan_check_write+0x18/0x20
[   16.286765]  ? queued_spin_lock_slowpath+0x116/0xb40
[   16.286794]  ? __pfx_queued_spin_lock_slowpath+0x10/0x10
[   16.286819]  ? __pfx_read_tsc+0x10/0x10
[   16.286841]  ? ktime_get_ts64+0x86/0x230
[   16.286874]  kunit_try_run_case+0x1a5/0x480
[   16.286898]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.286922]  ? _raw_spin_lock_irqsave+0xf9/0x100
[   16.286956]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.286980]  ? __kthread_parkme+0x82/0x180
[   16.287001]  ? preempt_count_sub+0x50/0x80
[   16.287026]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.287051]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.287075]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.287100]  kthread+0x337/0x6f0
[   16.287120]  ? trace_preempt_on+0x20/0xc0
[   16.287143]  ? __pfx_kthread+0x10/0x10
[   16.287164]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.287188]  ? calculate_sigpending+0x7b/0xa0
[   16.287212]  ? __pfx_kthread+0x10/0x10
[   16.287234]  ret_from_fork+0x116/0x1d0
[   16.287253]  ? __pfx_kthread+0x10/0x10
[   16.287274]  ret_from_fork_asm+0x1a/0x30
[   16.287305]  </TASK>
[   16.287316] 
[   16.295138] Allocated by task 304:
[   16.295276]  kasan_save_stack+0x45/0x70
[   16.295454]  kasan_save_track+0x18/0x40
[   16.295823]  kasan_save_alloc_info+0x3b/0x50
[   16.296063]  __kasan_kmalloc+0xb7/0xc0
[   16.296273]  __kmalloc_noprof+0x1c9/0x500
[   16.296482]  kunit_kmalloc_array+0x25/0x60
[   16.296697]  copy_user_test_oob+0xab/0x10f0
[   16.296920]  kunit_try_run_case+0x1a5/0x480
[   16.297072]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.297359]  kthread+0x337/0x6f0
[   16.297529]  ret_from_fork+0x116/0x1d0
[   16.297713]  ret_from_fork_asm+0x1a/0x30
[   16.297879] 
[   16.298070] The buggy address belongs to the object at ffff8881039ee400
[   16.298070]  which belongs to the cache kmalloc-128 of size 128
[   16.298610] The buggy address is located 0 bytes inside of
[   16.298610]  allocated 120-byte region [ffff8881039ee400, ffff8881039ee478)
[   16.299084] 
[   16.299158] The buggy address belongs to the physical page:
[   16.299343] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039ee
[   16.299713] flags: 0x200000000000000(node=0|zone=2)
[   16.299946] page_type: f5(slab)
[   16.300144] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.300460] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.300860] page dumped because: kasan: bad access detected
[   16.301107] 
[   16.301206] Memory state around the buggy address:
[   16.301400]  ffff8881039ee300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.301619]  ffff8881039ee380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.301834] >ffff8881039ee400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.302048]                                                                 ^
[   16.302404]  ffff8881039ee480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.302946]  ffff8881039ee500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.303254] ==================================================================