Hay
Date
July 8, 2025, 4:38 p.m.

Environment
qemu-x86_64

[   15.389114] ==================================================================
[   15.390025] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   15.390456] Write of size 121 at addr ffff888103606900 by task kunit_try_catch/305
[   15.391123] 
[   15.391258] CPU: 0 UID: 0 PID: 305 Comm: kunit_try_catch Tainted: G    B            N  6.15.6-rc1 #1 PREEMPT(voluntary) 
[   15.391311] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.391326] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.391353] Call Trace:
[   15.391368]  <TASK>
[   15.391388]  dump_stack_lvl+0x73/0xb0
[   15.391420]  print_report+0xd1/0x650
[   15.391448]  ? __virt_addr_valid+0x1db/0x2d0
[   15.391473]  ? _copy_from_user+0x32/0x90
[   15.391495]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.391521]  ? _copy_from_user+0x32/0x90
[   15.391543]  kasan_report+0x141/0x180
[   15.391567]  ? _copy_from_user+0x32/0x90
[   15.391605]  kasan_check_range+0x10c/0x1c0
[   15.391628]  __kasan_check_write+0x18/0x20
[   15.391650]  _copy_from_user+0x32/0x90
[   15.391673]  copy_user_test_oob+0x2be/0x10f0
[   15.391698]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.391719]  ? finish_task_switch.isra.0+0x153/0x700
[   15.391745]  ? __switch_to+0x5d9/0xf60
[   15.391769]  ? dequeue_task_fair+0x156/0x4e0
[   15.391795]  ? __schedule+0x10cc/0x2b60
[   15.391821]  ? __pfx_read_tsc+0x10/0x10
[   15.391842]  ? ktime_get_ts64+0x86/0x230
[   15.391870]  kunit_try_run_case+0x1a5/0x480
[   15.391904]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.391925]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.391953]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.391982]  ? __kthread_parkme+0x82/0x180
[   15.392032]  ? preempt_count_sub+0x50/0x80
[   15.392059]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.392083]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.392110]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.392137]  kthread+0x337/0x6f0
[   15.392155]  ? trace_preempt_on+0x20/0xc0
[   15.392183]  ? __pfx_kthread+0x10/0x10
[   15.392203]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.392227]  ? calculate_sigpending+0x7b/0xa0
[   15.392252]  ? __pfx_kthread+0x10/0x10
[   15.392273]  ret_from_fork+0x41/0x80
[   15.392295]  ? __pfx_kthread+0x10/0x10
[   15.392315]  ret_from_fork_asm+0x1a/0x30
[   15.392349]  </TASK>
[   15.392362] 
[   15.403306] Allocated by task 305:
[   15.403492]  kasan_save_stack+0x45/0x70
[   15.403702]  kasan_save_track+0x18/0x40
[   15.403900]  kasan_save_alloc_info+0x3b/0x50
[   15.404101]  __kasan_kmalloc+0xb7/0xc0
[   15.404285]  __kmalloc_noprof+0x1c9/0x500
[   15.404480]  kunit_kmalloc_array+0x25/0x60
[   15.405092]  copy_user_test_oob+0xab/0x10f0
[   15.405303]  kunit_try_run_case+0x1a5/0x480
[   15.405726]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.406118]  kthread+0x337/0x6f0
[   15.406497]  ret_from_fork+0x41/0x80
[   15.406823]  ret_from_fork_asm+0x1a/0x30
[   15.407157] 
[   15.407258] The buggy address belongs to the object at ffff888103606900
[   15.407258]  which belongs to the cache kmalloc-128 of size 128
[   15.408070] The buggy address is located 0 bytes inside of
[   15.408070]  allocated 120-byte region [ffff888103606900, ffff888103606978)
[   15.409004] 
[   15.409239] The buggy address belongs to the physical page:
[   15.409487] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103606
[   15.409818] flags: 0x200000000000000(node=0|zone=2)
[   15.410217] page_type: f5(slab)
[   15.410388] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.410989] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.411526] page dumped because: kasan: bad access detected
[   15.411790] 
[   15.411898] Memory state around the buggy address:
[   15.412117]  ffff888103606800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.412416]  ffff888103606880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.413131] >ffff888103606900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.413671]                                                                 ^
[   15.414111]  ffff888103606980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.414423]  ffff888103606a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.414969] ==================================================================