Hay
Date
July 9, 2025, 11:07 p.m.

Environment
qemu-x86_64

[   16.580036] ==================================================================
[   16.580654] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   16.580965] Write of size 121 at addr ffff8881031fd400 by task kunit_try_catch/302
[   16.581320] 
[   16.581464] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   16.581513] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.581526] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.581564] Call Trace:
[   16.581579]  <TASK>
[   16.581599]  dump_stack_lvl+0x73/0xb0
[   16.581634]  print_report+0xd1/0x650
[   16.581669]  ? __virt_addr_valid+0x1db/0x2d0
[   16.581695]  ? _copy_from_user+0x32/0x90
[   16.581734]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.581760]  ? _copy_from_user+0x32/0x90
[   16.581781]  kasan_report+0x141/0x180
[   16.581804]  ? _copy_from_user+0x32/0x90
[   16.581829]  kasan_check_range+0x10c/0x1c0
[   16.581864]  __kasan_check_write+0x18/0x20
[   16.581885]  _copy_from_user+0x32/0x90
[   16.581906]  copy_user_test_oob+0x2be/0x10f0
[   16.581945]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.581970]  ? finish_task_switch.isra.0+0x153/0x700
[   16.581995]  ? __switch_to+0x47/0xf50
[   16.582022]  ? __schedule+0x10cc/0x2b60
[   16.582067]  ? __pfx_read_tsc+0x10/0x10
[   16.582091]  ? ktime_get_ts64+0x86/0x230
[   16.582117]  kunit_try_run_case+0x1a5/0x480
[   16.582143]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.582167]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.582192]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.582217]  ? __kthread_parkme+0x82/0x180
[   16.582240]  ? preempt_count_sub+0x50/0x80
[   16.582265]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.582300]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.582327]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.582364]  kthread+0x337/0x6f0
[   16.582383]  ? trace_preempt_on+0x20/0xc0
[   16.582409]  ? __pfx_kthread+0x10/0x10
[   16.582431]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.582455]  ? calculate_sigpending+0x7b/0xa0
[   16.582482]  ? __pfx_kthread+0x10/0x10
[   16.582504]  ret_from_fork+0x116/0x1d0
[   16.582524]  ? __pfx_kthread+0x10/0x10
[   16.582546]  ret_from_fork_asm+0x1a/0x30
[   16.582578]  </TASK>
[   16.582591] 
[   16.590840] Allocated by task 302:
[   16.590978]  kasan_save_stack+0x45/0x70
[   16.591350]  kasan_save_track+0x18/0x40
[   16.591558]  kasan_save_alloc_info+0x3b/0x50
[   16.591774]  __kasan_kmalloc+0xb7/0xc0
[   16.591942]  __kmalloc_noprof+0x1c9/0x500
[   16.592273]  kunit_kmalloc_array+0x25/0x60
[   16.592473]  copy_user_test_oob+0xab/0x10f0
[   16.592635]  kunit_try_run_case+0x1a5/0x480
[   16.592792]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.592969]  kthread+0x337/0x6f0
[   16.593102]  ret_from_fork+0x116/0x1d0
[   16.593423]  ret_from_fork_asm+0x1a/0x30
[   16.593733] 
[   16.593830] The buggy address belongs to the object at ffff8881031fd400
[   16.593830]  which belongs to the cache kmalloc-128 of size 128
[   16.594468] The buggy address is located 0 bytes inside of
[   16.594468]  allocated 120-byte region [ffff8881031fd400, ffff8881031fd478)
[   16.594977] 
[   16.595133] The buggy address belongs to the physical page:
[   16.595320] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1031fd
[   16.595640] flags: 0x200000000000000(node=0|zone=2)
[   16.595898] page_type: f5(slab)
[   16.596096] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.596413] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.596737] page dumped because: kasan: bad access detected
[   16.596957] 
[   16.597077] Memory state around the buggy address:
[   16.597279]  ffff8881031fd300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.597546]  ffff8881031fd380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.597773] >ffff8881031fd400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.597987]                                                                 ^
[   16.598198]  ffff8881031fd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.598445]  ffff8881031fd500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.598775] ==================================================================