Date
July 4, 2025, 11:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.422360] ================================================================== [ 18.422630] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 18.422739] Read of size 8 at addr fff00000c5a51b80 by task kunit_try_catch/200 [ 18.422792] [ 18.422857] CPU: 1 UID: 0 PID: 200 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 18.423003] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.423032] Hardware name: linux,dummy-virt (DT) [ 18.423065] Call trace: [ 18.423107] show_stack+0x20/0x38 (C) [ 18.423162] dump_stack_lvl+0x8c/0xd0 [ 18.423351] print_report+0x118/0x608 [ 18.423548] kasan_report+0xdc/0x128 [ 18.423646] __asan_report_load8_noabort+0x20/0x30 [ 18.423730] workqueue_uaf+0x480/0x4a8 [ 18.423794] kunit_try_run_case+0x170/0x3f0 [ 18.423889] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.423993] kthread+0x328/0x630 [ 18.424058] ret_from_fork+0x10/0x20 [ 18.424140] [ 18.424217] Allocated by task 200: [ 18.424288] kasan_save_stack+0x3c/0x68 [ 18.424336] kasan_save_track+0x20/0x40 [ 18.424373] kasan_save_alloc_info+0x40/0x58 [ 18.424640] __kasan_kmalloc+0xd4/0xd8 [ 18.424763] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.424839] workqueue_uaf+0x13c/0x4a8 [ 18.424875] kunit_try_run_case+0x170/0x3f0 [ 18.424913] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.424967] kthread+0x328/0x630 [ 18.425010] ret_from_fork+0x10/0x20 [ 18.425062] [ 18.425081] Freed by task 47: [ 18.425108] kasan_save_stack+0x3c/0x68 [ 18.425161] kasan_save_track+0x20/0x40 [ 18.425199] kasan_save_free_info+0x4c/0x78 [ 18.425240] __kasan_slab_free+0x6c/0x98 [ 18.425278] kfree+0x214/0x3c8 [ 18.425310] workqueue_uaf_work+0x18/0x30 [ 18.425354] process_one_work+0x530/0xf98 [ 18.425392] worker_thread+0x618/0xf38 [ 18.425433] kthread+0x328/0x630 [ 18.425476] ret_from_fork+0x10/0x20 [ 18.425520] [ 18.425550] Last potentially related work creation: [ 18.425577] kasan_save_stack+0x3c/0x68 [ 18.425615] kasan_record_aux_stack+0xb4/0xc8 [ 18.425657] __queue_work+0x65c/0x1008 [ 18.425695] queue_work_on+0xbc/0xf8 [ 18.425731] workqueue_uaf+0x210/0x4a8 [ 18.425774] kunit_try_run_case+0x170/0x3f0 [ 18.425828] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.425871] kthread+0x328/0x630 [ 18.425903] ret_from_fork+0x10/0x20 [ 18.425937] [ 18.425955] The buggy address belongs to the object at fff00000c5a51b80 [ 18.425955] which belongs to the cache kmalloc-32 of size 32 [ 18.426347] The buggy address is located 0 bytes inside of [ 18.426347] freed 32-byte region [fff00000c5a51b80, fff00000c5a51ba0) [ 18.426453] [ 18.426549] The buggy address belongs to the physical page: [ 18.426595] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a51 [ 18.426652] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.426973] page_type: f5(slab) [ 18.427100] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.427166] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.427246] page dumped because: kasan: bad access detected [ 18.427333] [ 18.427394] Memory state around the buggy address: [ 18.427450] fff00000c5a51a80: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 18.427573] fff00000c5a51b00: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 18.427651] >fff00000c5a51b80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.427716] ^ [ 18.427772] fff00000c5a51c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.427869] fff00000c5a51c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.427932] ==================================================================
[ 12.591932] ================================================================== [ 12.593100] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 12.593968] Read of size 8 at addr ffff888103983200 by task kunit_try_catch/217 [ 12.594450] [ 12.594556] CPU: 1 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 12.594607] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.594618] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.594640] Call Trace: [ 12.594658] <TASK> [ 12.594678] dump_stack_lvl+0x73/0xb0 [ 12.594713] print_report+0xd1/0x650 [ 12.594736] ? __virt_addr_valid+0x1db/0x2d0 [ 12.594758] ? workqueue_uaf+0x4d6/0x560 [ 12.594778] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.594799] ? workqueue_uaf+0x4d6/0x560 [ 12.594819] kasan_report+0x141/0x180 [ 12.594839] ? workqueue_uaf+0x4d6/0x560 [ 12.594863] __asan_report_load8_noabort+0x18/0x20 [ 12.594886] workqueue_uaf+0x4d6/0x560 [ 12.594906] ? __pfx_workqueue_uaf+0x10/0x10 [ 12.594928] ? __pfx_workqueue_uaf+0x10/0x10 [ 12.594952] kunit_try_run_case+0x1a5/0x480 [ 12.594976] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.594996] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.595019] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.595041] ? __kthread_parkme+0x82/0x180 [ 12.595060] ? preempt_count_sub+0x50/0x80 [ 12.595082] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.595104] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.595125] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.595146] kthread+0x337/0x6f0 [ 12.595164] ? trace_preempt_on+0x20/0xc0 [ 12.595186] ? __pfx_kthread+0x10/0x10 [ 12.595205] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.595236] ? calculate_sigpending+0x7b/0xa0 [ 12.595258] ? __pfx_kthread+0x10/0x10 [ 12.595278] ret_from_fork+0x116/0x1d0 [ 12.595296] ? __pfx_kthread+0x10/0x10 [ 12.595315] ret_from_fork_asm+0x1a/0x30 [ 12.595345] </TASK> [ 12.595356] [ 12.607107] Allocated by task 217: [ 12.607612] kasan_save_stack+0x45/0x70 [ 12.607805] kasan_save_track+0x18/0x40 [ 12.608006] kasan_save_alloc_info+0x3b/0x50 [ 12.608158] __kasan_kmalloc+0xb7/0xc0 [ 12.608310] __kmalloc_cache_noprof+0x189/0x420 [ 12.608643] workqueue_uaf+0x152/0x560 [ 12.608853] kunit_try_run_case+0x1a5/0x480 [ 12.609013] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.609331] kthread+0x337/0x6f0 [ 12.609605] ret_from_fork+0x116/0x1d0 [ 12.609760] ret_from_fork_asm+0x1a/0x30 [ 12.609927] [ 12.610021] Freed by task 41: [ 12.610192] kasan_save_stack+0x45/0x70 [ 12.610616] kasan_save_track+0x18/0x40 [ 12.611022] kasan_save_free_info+0x3f/0x60 [ 12.611204] __kasan_slab_free+0x56/0x70 [ 12.611637] kfree+0x222/0x3f0 [ 12.611971] workqueue_uaf_work+0x12/0x20 [ 12.612371] process_one_work+0x5ee/0xf60 [ 12.612725] worker_thread+0x758/0x1220 [ 12.613167] kthread+0x337/0x6f0 [ 12.613537] ret_from_fork+0x116/0x1d0 [ 12.613724] ret_from_fork_asm+0x1a/0x30 [ 12.613908] [ 12.614004] Last potentially related work creation: [ 12.614492] kasan_save_stack+0x45/0x70 [ 12.614785] kasan_record_aux_stack+0xb2/0xc0 [ 12.615146] __queue_work+0x626/0xeb0 [ 12.615504] queue_work_on+0xb6/0xc0 [ 12.615691] workqueue_uaf+0x26d/0x560 [ 12.615871] kunit_try_run_case+0x1a5/0x480 [ 12.616061] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.616593] kthread+0x337/0x6f0 [ 12.617019] ret_from_fork+0x116/0x1d0 [ 12.617751] ret_from_fork_asm+0x1a/0x30 [ 12.617916] [ 12.617991] The buggy address belongs to the object at ffff888103983200 [ 12.617991] which belongs to the cache kmalloc-32 of size 32 [ 12.618620] The buggy address is located 0 bytes inside of [ 12.618620] freed 32-byte region [ffff888103983200, ffff888103983220) [ 12.619119] [ 12.619226] The buggy address belongs to the physical page: [ 12.619485] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103983 [ 12.619985] flags: 0x200000000000000(node=0|zone=2) [ 12.620351] page_type: f5(slab) [ 12.620581] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.620904] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.621235] page dumped because: kasan: bad access detected [ 12.621620] [ 12.621759] Memory state around the buggy address: [ 12.621972] ffff888103983100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 12.622404] ffff888103983180: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 12.622851] >ffff888103983200: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 12.623075] ^ [ 12.623306] ffff888103983280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.623672] ffff888103983300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.624758] ==================================================================