Hay
Date
July 16, 2025, 3:10 p.m.

Environment
qemu-x86_64

[   16.676643] ==================================================================
[   16.677012] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   16.677402] Read of size 121 at addr ffff88810307db00 by task kunit_try_catch/302
[   16.677725] 
[   16.678088] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   16.678139] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.678153] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.678176] Call Trace:
[   16.678193]  <TASK>
[   16.678209]  dump_stack_lvl+0x73/0xb0
[   16.678242]  print_report+0xd1/0x610
[   16.678268]  ? __virt_addr_valid+0x1db/0x2d0
[   16.678293]  ? _copy_to_user+0x3c/0x70
[   16.678314]  ? kasan_complete_mode_report_info+0x2a/0x200
[   16.678339]  ? _copy_to_user+0x3c/0x70
[   16.678361]  kasan_report+0x141/0x180
[   16.678384]  ? _copy_to_user+0x3c/0x70
[   16.678410]  kasan_check_range+0x10c/0x1c0
[   16.678436]  __kasan_check_read+0x15/0x20
[   16.678526]  _copy_to_user+0x3c/0x70
[   16.678548]  copy_user_test_oob+0x364/0x10f0
[   16.678577]  ? __pfx_copy_user_test_oob+0x10/0x10
[   16.678602]  ? finish_task_switch.isra.0+0x153/0x700
[   16.678628]  ? __switch_to+0x47/0xf50
[   16.678654]  ? __schedule+0x10cc/0x2b60
[   16.678680]  ? __pfx_read_tsc+0x10/0x10
[   16.678704]  ? ktime_get_ts64+0x86/0x230
[   16.678730]  kunit_try_run_case+0x1a5/0x480
[   16.678756]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.678795]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.678823]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.678849]  ? __kthread_parkme+0x82/0x180
[   16.678872]  ? preempt_count_sub+0x50/0x80
[   16.678898]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.678925]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.678952]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.678979]  kthread+0x337/0x6f0
[   16.679001]  ? trace_preempt_on+0x20/0xc0
[   16.679027]  ? __pfx_kthread+0x10/0x10
[   16.679049]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.679073]  ? calculate_sigpending+0x7b/0xa0
[   16.679099]  ? __pfx_kthread+0x10/0x10
[   16.679122]  ret_from_fork+0x116/0x1d0
[   16.679143]  ? __pfx_kthread+0x10/0x10
[   16.679166]  ret_from_fork_asm+0x1a/0x30
[   16.679203]  </TASK>
[   16.679214] 
[   16.688844] Allocated by task 302:
[   16.689028]  kasan_save_stack+0x45/0x70
[   16.689189]  kasan_save_track+0x18/0x40
[   16.689388]  kasan_save_alloc_info+0x3b/0x50
[   16.689945]  __kasan_kmalloc+0xb7/0xc0
[   16.690115]  __kmalloc_noprof+0x1c9/0x500
[   16.690440]  kunit_kmalloc_array+0x25/0x60
[   16.690686]  copy_user_test_oob+0xab/0x10f0
[   16.690973]  kunit_try_run_case+0x1a5/0x480
[   16.691229]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.691575]  kthread+0x337/0x6f0
[   16.691729]  ret_from_fork+0x116/0x1d0
[   16.692033]  ret_from_fork_asm+0x1a/0x30
[   16.692271] 
[   16.692374] The buggy address belongs to the object at ffff88810307db00
[   16.692374]  which belongs to the cache kmalloc-128 of size 128
[   16.693094] The buggy address is located 0 bytes inside of
[   16.693094]  allocated 120-byte region [ffff88810307db00, ffff88810307db78)
[   16.693651] 
[   16.693879] The buggy address belongs to the physical page:
[   16.694079] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10307d
[   16.694556] flags: 0x200000000000000(node=0|zone=2)
[   16.694832] page_type: f5(slab)
[   16.695001] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   16.695433] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   16.695844] page dumped because: kasan: bad access detected
[   16.696107] 
[   16.696188] Memory state around the buggy address:
[   16.696394]  ffff88810307da00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   16.696904]  ffff88810307da80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.697285] >ffff88810307db00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   16.697614]                                                                 ^
[   16.698048]  ffff88810307db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.698409]  ffff88810307dc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   16.698821] ==================================================================