Hay
Date
July 1, 2025, 11:08 a.m.

Environment
qemu-x86_64

[   15.443136] ==================================================================
[   15.443814] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   15.444609] Write of size 121 at addr ffff88810258dd00 by task kunit_try_catch/302
[   15.445163] 
[   15.445298] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.445586] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.445603] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.445630] Call Trace:
[   15.445650]  <TASK>
[   15.445676]  dump_stack_lvl+0x73/0xb0
[   15.445712]  print_report+0xd1/0x650
[   15.445739]  ? __virt_addr_valid+0x1db/0x2d0
[   15.445766]  ? _copy_from_user+0x32/0x90
[   15.445786]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.445809]  ? _copy_from_user+0x32/0x90
[   15.445829]  kasan_report+0x141/0x180
[   15.445852]  ? _copy_from_user+0x32/0x90
[   15.445877]  kasan_check_range+0x10c/0x1c0
[   15.445902]  __kasan_check_write+0x18/0x20
[   15.445923]  _copy_from_user+0x32/0x90
[   15.445945]  copy_user_test_oob+0x2be/0x10f0
[   15.445971]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.445993]  ? finish_task_switch.isra.0+0x153/0x700
[   15.446020]  ? __switch_to+0x47/0xf50
[   15.446047]  ? __schedule+0x10cc/0x2b60
[   15.446072]  ? __pfx_read_tsc+0x10/0x10
[   15.446095]  ? ktime_get_ts64+0x86/0x230
[   15.446121]  kunit_try_run_case+0x1a5/0x480
[   15.446145]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.446168]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.446193]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.446216]  ? __kthread_parkme+0x82/0x180
[   15.446239]  ? preempt_count_sub+0x50/0x80
[   15.446263]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.446287]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.446311]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.446335]  kthread+0x337/0x6f0
[   15.446355]  ? trace_preempt_on+0x20/0xc0
[   15.446393]  ? __pfx_kthread+0x10/0x10
[   15.446413]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.446435]  ? calculate_sigpending+0x7b/0xa0
[   15.446461]  ? __pfx_kthread+0x10/0x10
[   15.446483]  ret_from_fork+0x116/0x1d0
[   15.446502]  ? __pfx_kthread+0x10/0x10
[   15.446522]  ret_from_fork_asm+0x1a/0x30
[   15.446554]  </TASK>
[   15.446568] 
[   15.457472] Allocated by task 302:
[   15.457736]  kasan_save_stack+0x45/0x70
[   15.457949]  kasan_save_track+0x18/0x40
[   15.458558]  kasan_save_alloc_info+0x3b/0x50
[   15.458766]  __kasan_kmalloc+0xb7/0xc0
[   15.459198]  __kmalloc_noprof+0x1c9/0x500
[   15.459563]  kunit_kmalloc_array+0x25/0x60
[   15.459762]  copy_user_test_oob+0xab/0x10f0
[   15.460109]  kunit_try_run_case+0x1a5/0x480
[   15.460402]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.460583]  kthread+0x337/0x6f0
[   15.460711]  ret_from_fork+0x116/0x1d0
[   15.460846]  ret_from_fork_asm+0x1a/0x30
[   15.461154] 
[   15.461260] The buggy address belongs to the object at ffff88810258dd00
[   15.461260]  which belongs to the cache kmalloc-128 of size 128
[   15.462328] The buggy address is located 0 bytes inside of
[   15.462328]  allocated 120-byte region [ffff88810258dd00, ffff88810258dd78)
[   15.463013] 
[   15.463270] The buggy address belongs to the physical page:
[   15.463527] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10258d
[   15.464035] flags: 0x200000000000000(node=0|zone=2)
[   15.464399] page_type: f5(slab)
[   15.464586] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.465147] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.465523] page dumped because: kasan: bad access detected
[   15.465918] 
[   15.466127] Memory state around the buggy address:
[   15.466433]  ffff88810258dc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.466813]  ffff88810258dc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.467436] >ffff88810258dd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.467959]                                                                 ^
[   15.468338]  ffff88810258dd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.468793]  ffff88810258de00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.469304] ==================================================================