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

Environment
qemu-x86_64

[   15.473184] ==================================================================
[   15.473532] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x3c/0x70
[   15.473882] Read of size 121 at addr ffff88810258dd00 by task kunit_try_catch/302
[   15.474454] 
[   15.474575] CPU: 0 UID: 0 PID: 302 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   15.474625] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.474638] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.474662] Call Trace:
[   15.474678]  <TASK>
[   15.474702]  dump_stack_lvl+0x73/0xb0
[   15.474734]  print_report+0xd1/0x650
[   15.474760]  ? __virt_addr_valid+0x1db/0x2d0
[   15.474785]  ? _copy_to_user+0x3c/0x70
[   15.474805]  ? kasan_complete_mode_report_info+0x2a/0x200
[   15.474828]  ? _copy_to_user+0x3c/0x70
[   15.474848]  kasan_report+0x141/0x180
[   15.474872]  ? _copy_to_user+0x3c/0x70
[   15.474896]  kasan_check_range+0x10c/0x1c0
[   15.474920]  __kasan_check_read+0x15/0x20
[   15.474940]  _copy_to_user+0x3c/0x70
[   15.474960]  copy_user_test_oob+0x364/0x10f0
[   15.474985]  ? __pfx_copy_user_test_oob+0x10/0x10
[   15.475009]  ? finish_task_switch.isra.0+0x153/0x700
[   15.475033]  ? __switch_to+0x47/0xf50
[   15.475060]  ? __schedule+0x10cc/0x2b60
[   15.475083]  ? __pfx_read_tsc+0x10/0x10
[   15.475105]  ? ktime_get_ts64+0x86/0x230
[   15.475130]  kunit_try_run_case+0x1a5/0x480
[   15.475154]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.475178]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   15.475203]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   15.475228]  ? __kthread_parkme+0x82/0x180
[   15.475251]  ? preempt_count_sub+0x50/0x80
[   15.475274]  ? __pfx_kunit_try_run_case+0x10/0x10
[   15.475300]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.475324]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   15.475349]  kthread+0x337/0x6f0
[   15.475368]  ? trace_preempt_on+0x20/0xc0
[   15.475405]  ? __pfx_kthread+0x10/0x10
[   15.475427]  ? _raw_spin_unlock_irq+0x47/0x80
[   15.475449]  ? calculate_sigpending+0x7b/0xa0
[   15.475473]  ? __pfx_kthread+0x10/0x10
[   15.475496]  ret_from_fork+0x116/0x1d0
[   15.475515]  ? __pfx_kthread+0x10/0x10
[   15.475536]  ret_from_fork_asm+0x1a/0x30
[   15.475567]  </TASK>
[   15.475595] 
[   15.482597] Allocated by task 302:
[   15.482891]  kasan_save_stack+0x45/0x70
[   15.483103]  kasan_save_track+0x18/0x40
[   15.483298]  kasan_save_alloc_info+0x3b/0x50
[   15.483512]  __kasan_kmalloc+0xb7/0xc0
[   15.483709]  __kmalloc_noprof+0x1c9/0x500
[   15.483886]  kunit_kmalloc_array+0x25/0x60
[   15.484083]  copy_user_test_oob+0xab/0x10f0
[   15.484275]  kunit_try_run_case+0x1a5/0x480
[   15.484452]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.484630]  kthread+0x337/0x6f0
[   15.484762]  ret_from_fork+0x116/0x1d0
[   15.484958]  ret_from_fork_asm+0x1a/0x30
[   15.485155] 
[   15.485252] The buggy address belongs to the object at ffff88810258dd00
[   15.485252]  which belongs to the cache kmalloc-128 of size 128
[   15.485865] The buggy address is located 0 bytes inside of
[   15.485865]  allocated 120-byte region [ffff88810258dd00, ffff88810258dd78)
[   15.486222] 
[   15.486301] The buggy address belongs to the physical page:
[   15.486490] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10258d
[   15.487175] flags: 0x200000000000000(node=0|zone=2)
[   15.487432] page_type: f5(slab)
[   15.487605] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   15.487944] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   15.488173] page dumped because: kasan: bad access detected
[   15.488442] 
[   15.488538] Memory state around the buggy address:
[   15.488993]  ffff88810258dc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.489216]  ffff88810258dc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.489468] >ffff88810258dd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   15.489953]                                                                 ^
[   15.490266]  ffff88810258dd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.490545]  ffff88810258de00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.490833] ==================================================================