Date
July 9, 2025, 12:11 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 20.022964] ================================================================== [ 20.023046] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 20.023443] Read of size 8 at addr fff00000c64b3f00 by task kunit_try_catch/201 [ 20.023533] [ 20.023569] CPU: 1 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 20.023743] Tainted: [B]=BAD_PAGE, [N]=TEST [ 20.023792] Hardware name: linux,dummy-virt (DT) [ 20.023831] Call trace: [ 20.023860] show_stack+0x20/0x38 (C) [ 20.024080] dump_stack_lvl+0x8c/0xd0 [ 20.024316] print_report+0x118/0x608 [ 20.024484] kasan_report+0xdc/0x128 [ 20.024584] __asan_report_load8_noabort+0x20/0x30 [ 20.024672] workqueue_uaf+0x480/0x4a8 [ 20.024802] kunit_try_run_case+0x170/0x3f0 [ 20.024855] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 20.025058] kthread+0x328/0x630 [ 20.025119] ret_from_fork+0x10/0x20 [ 20.025318] [ 20.025460] Allocated by task 201: [ 20.025528] kasan_save_stack+0x3c/0x68 [ 20.025610] kasan_save_track+0x20/0x40 [ 20.025741] kasan_save_alloc_info+0x40/0x58 [ 20.025807] __kasan_kmalloc+0xd4/0xd8 [ 20.025876] __kmalloc_cache_noprof+0x16c/0x3c0 [ 20.026226] workqueue_uaf+0x13c/0x4a8 [ 20.026365] kunit_try_run_case+0x170/0x3f0 [ 20.026440] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 20.026563] kthread+0x328/0x630 [ 20.026642] ret_from_fork+0x10/0x20 [ 20.026714] [ 20.026785] Freed by task 48: [ 20.026823] kasan_save_stack+0x3c/0x68 [ 20.026879] kasan_save_track+0x20/0x40 [ 20.027233] kasan_save_free_info+0x4c/0x78 [ 20.027309] __kasan_slab_free+0x6c/0x98 [ 20.027459] kfree+0x214/0x3c8 [ 20.027526] workqueue_uaf_work+0x18/0x30 [ 20.027659] process_one_work+0x530/0xf98 [ 20.027730] worker_thread+0x618/0xf38 [ 20.027767] kthread+0x328/0x630 [ 20.028051] ret_from_fork+0x10/0x20 [ 20.028263] [ 20.028376] Last potentially related work creation: [ 20.028477] kasan_save_stack+0x3c/0x68 [ 20.028619] kasan_record_aux_stack+0xb4/0xc8 [ 20.028785] __queue_work+0x65c/0x1008 [ 20.028832] queue_work_on+0xbc/0xf8 [ 20.028870] workqueue_uaf+0x210/0x4a8 [ 20.028915] kunit_try_run_case+0x170/0x3f0 [ 20.028959] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 20.029006] kthread+0x328/0x630 [ 20.029040] ret_from_fork+0x10/0x20 [ 20.029769] [ 20.030234] The buggy address belongs to the object at fff00000c64b3f00 [ 20.030234] which belongs to the cache kmalloc-32 of size 32 [ 20.030439] The buggy address is located 0 bytes inside of [ 20.030439] freed 32-byte region [fff00000c64b3f00, fff00000c64b3f20) [ 20.030576] [ 20.030616] The buggy address belongs to the physical page: [ 20.030665] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1064b3 [ 20.032613] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 20.032960] page_type: f5(slab) [ 20.033178] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 20.033256] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 20.033564] page dumped because: kasan: bad access detected [ 20.033786] [ 20.033832] Memory state around the buggy address: [ 20.033869] fff00000c64b3e00: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 20.034059] fff00000c64b3e80: 00 00 00 07 fc fc fc fc 00 00 00 fc fc fc fc fc [ 20.034277] >fff00000c64b3f00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 20.034361] ^ [ 20.034433] fff00000c64b3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 20.034496] fff00000c64b4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 20.034810] ==================================================================
[ 13.284676] ================================================================== [ 13.285138] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 13.285459] Read of size 8 at addr ffff8881026ae780 by task kunit_try_catch/217 [ 13.286106] [ 13.286216] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 13.286273] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.286285] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.286307] Call Trace: [ 13.286319] <TASK> [ 13.286337] dump_stack_lvl+0x73/0xb0 [ 13.286372] print_report+0xd1/0x650 [ 13.286395] ? __virt_addr_valid+0x1db/0x2d0 [ 13.286419] ? workqueue_uaf+0x4d6/0x560 [ 13.286439] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.286462] ? workqueue_uaf+0x4d6/0x560 [ 13.286483] kasan_report+0x141/0x180 [ 13.286504] ? workqueue_uaf+0x4d6/0x560 [ 13.286530] __asan_report_load8_noabort+0x18/0x20 [ 13.286554] workqueue_uaf+0x4d6/0x560 [ 13.286576] ? __pfx_workqueue_uaf+0x10/0x10 [ 13.286597] ? __schedule+0x10cc/0x2b60 [ 13.286619] ? __pfx_read_tsc+0x10/0x10 [ 13.286640] ? ktime_get_ts64+0x86/0x230 [ 13.286665] kunit_try_run_case+0x1a5/0x480 [ 13.286690] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.286719] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.286743] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.286766] ? __kthread_parkme+0x82/0x180 [ 13.286787] ? preempt_count_sub+0x50/0x80 [ 13.286811] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.286834] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.286859] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.286883] kthread+0x337/0x6f0 [ 13.286901] ? trace_preempt_on+0x20/0xc0 [ 13.286935] ? __pfx_kthread+0x10/0x10 [ 13.287202] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.287230] ? calculate_sigpending+0x7b/0xa0 [ 13.287255] ? __pfx_kthread+0x10/0x10 [ 13.287296] ret_from_fork+0x116/0x1d0 [ 13.287316] ? __pfx_kthread+0x10/0x10 [ 13.287375] ret_from_fork_asm+0x1a/0x30 [ 13.287406] </TASK> [ 13.287419] [ 13.298832] Allocated by task 217: [ 13.299182] kasan_save_stack+0x45/0x70 [ 13.299842] kasan_save_track+0x18/0x40 [ 13.300078] kasan_save_alloc_info+0x3b/0x50 [ 13.300462] __kasan_kmalloc+0xb7/0xc0 [ 13.300657] __kmalloc_cache_noprof+0x189/0x420 [ 13.300868] workqueue_uaf+0x152/0x560 [ 13.301441] kunit_try_run_case+0x1a5/0x480 [ 13.301630] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.301867] kthread+0x337/0x6f0 [ 13.302221] ret_from_fork+0x116/0x1d0 [ 13.302622] ret_from_fork_asm+0x1a/0x30 [ 13.302805] [ 13.302897] Freed by task 9: [ 13.303243] kasan_save_stack+0x45/0x70 [ 13.303423] kasan_save_track+0x18/0x40 [ 13.303603] kasan_save_free_info+0x3f/0x60 [ 13.303797] __kasan_slab_free+0x56/0x70 [ 13.304215] kfree+0x222/0x3f0 [ 13.304500] workqueue_uaf_work+0x12/0x20 [ 13.304686] process_one_work+0x5ee/0xf60 [ 13.304871] worker_thread+0x758/0x1220 [ 13.305229] kthread+0x337/0x6f0 [ 13.305398] ret_from_fork+0x116/0x1d0 [ 13.305572] ret_from_fork_asm+0x1a/0x30 [ 13.305754] [ 13.305841] Last potentially related work creation: [ 13.306099] kasan_save_stack+0x45/0x70 [ 13.306300] kasan_record_aux_stack+0xb2/0xc0 [ 13.306497] __queue_work+0x626/0xeb0 [ 13.306670] queue_work_on+0xb6/0xc0 [ 13.306842] workqueue_uaf+0x26d/0x560 [ 13.307065] kunit_try_run_case+0x1a5/0x480 [ 13.307262] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.307490] kthread+0x337/0x6f0 [ 13.307638] ret_from_fork+0x116/0x1d0 [ 13.307806] ret_from_fork_asm+0x1a/0x30 [ 13.308038] [ 13.308127] The buggy address belongs to the object at ffff8881026ae780 [ 13.308127] which belongs to the cache kmalloc-32 of size 32 [ 13.308743] The buggy address is located 0 bytes inside of [ 13.308743] freed 32-byte region [ffff8881026ae780, ffff8881026ae7a0) [ 13.309621] [ 13.309723] The buggy address belongs to the physical page: [ 13.310030] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1026ae [ 13.310472] flags: 0x200000000000000(node=0|zone=2) [ 13.310691] page_type: f5(slab) [ 13.310853] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 13.311222] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 13.311754] page dumped because: kasan: bad access detected [ 13.312074] [ 13.312165] Memory state around the buggy address: [ 13.313220] ffff8881026ae680: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 13.313470] ffff8881026ae700: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 13.313704] >ffff8881026ae780: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 13.314284] ^ [ 13.314450] ffff8881026ae800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.314746] ffff8881026ae880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.315106] ==================================================================