Date
July 17, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.851789] ================================================================== [ 15.851966] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 15.852153] Read of size 8 at addr fff00000c789a5c0 by task kunit_try_catch/201 [ 15.852262] [ 15.852318] CPU: 0 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.852426] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.852511] Hardware name: linux,dummy-virt (DT) [ 15.852581] Call trace: [ 15.852619] show_stack+0x20/0x38 (C) [ 15.852669] dump_stack_lvl+0x8c/0xd0 [ 15.852752] print_report+0x118/0x5d0 [ 15.852814] kasan_report+0xdc/0x128 [ 15.852909] __asan_report_load8_noabort+0x20/0x30 [ 15.853414] workqueue_uaf+0x480/0x4a8 [ 15.853472] kunit_try_run_case+0x170/0x3f0 [ 15.853524] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.853578] kthread+0x328/0x630 [ 15.853619] ret_from_fork+0x10/0x20 [ 15.853667] [ 15.853685] Allocated by task 201: [ 15.853714] kasan_save_stack+0x3c/0x68 [ 15.853756] kasan_save_track+0x20/0x40 [ 15.853793] kasan_save_alloc_info+0x40/0x58 [ 15.853832] __kasan_kmalloc+0xd4/0xd8 [ 15.853869] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.853908] workqueue_uaf+0x13c/0x4a8 [ 15.853944] kunit_try_run_case+0x170/0x3f0 [ 15.853993] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.854037] kthread+0x328/0x630 [ 15.854071] ret_from_fork+0x10/0x20 [ 15.854105] [ 15.854123] Freed by task 119: [ 15.854171] kasan_save_stack+0x3c/0x68 [ 15.854218] kasan_save_track+0x20/0x40 [ 15.854254] kasan_save_free_info+0x4c/0x78 [ 15.854292] __kasan_slab_free+0x6c/0x98 [ 15.854339] kfree+0x214/0x3c8 [ 15.854379] workqueue_uaf_work+0x18/0x30 [ 15.854415] process_one_work+0x530/0xf98 [ 15.854451] worker_thread+0x618/0xf38 [ 15.854499] kthread+0x328/0x630 [ 15.854547] ret_from_fork+0x10/0x20 [ 15.854581] [ 15.854601] Last potentially related work creation: [ 15.854635] kasan_save_stack+0x3c/0x68 [ 15.854672] kasan_record_aux_stack+0xb4/0xc8 [ 15.854713] __queue_work+0x65c/0x1008 [ 15.854748] queue_work_on+0xbc/0xf8 [ 15.854784] workqueue_uaf+0x210/0x4a8 [ 15.854829] kunit_try_run_case+0x170/0x3f0 [ 15.854867] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.854912] kthread+0x328/0x630 [ 15.854943] ret_from_fork+0x10/0x20 [ 15.854988] [ 15.855005] The buggy address belongs to the object at fff00000c789a5c0 [ 15.855005] which belongs to the cache kmalloc-32 of size 32 [ 15.855066] The buggy address is located 0 bytes inside of [ 15.855066] freed 32-byte region [fff00000c789a5c0, fff00000c789a5e0) [ 15.855137] [ 15.855156] The buggy address belongs to the physical page: [ 15.855197] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10789a [ 15.855258] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.855308] page_type: f5(slab) [ 15.855356] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 15.855406] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 15.855465] page dumped because: kasan: bad access detected [ 15.855507] [ 15.855532] Memory state around the buggy address: [ 15.855570] fff00000c789a480: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 15.855624] fff00000c789a500: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 15.855668] >fff00000c789a580: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 15.855708] ^ [ 15.855743] fff00000c789a600: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.855787] fff00000c789a680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.855834] ==================================================================
[ 13.621931] ================================================================== [ 13.622515] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 13.623268] Read of size 8 at addr ffff888102a11780 by task kunit_try_catch/217 [ 13.624015] [ 13.624183] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 13.624246] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.624258] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.624279] Call Trace: [ 13.624291] <TASK> [ 13.624306] dump_stack_lvl+0x73/0xb0 [ 13.624335] print_report+0xd1/0x610 [ 13.624386] ? __virt_addr_valid+0x1db/0x2d0 [ 13.624426] ? workqueue_uaf+0x4d6/0x560 [ 13.624447] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.624471] ? workqueue_uaf+0x4d6/0x560 [ 13.624493] kasan_report+0x141/0x180 [ 13.624514] ? workqueue_uaf+0x4d6/0x560 [ 13.624540] __asan_report_load8_noabort+0x18/0x20 [ 13.624575] workqueue_uaf+0x4d6/0x560 [ 13.624597] ? __pfx_workqueue_uaf+0x10/0x10 [ 13.624620] ? __schedule+0x10cc/0x2b60 [ 13.624642] ? __pfx_read_tsc+0x10/0x10 [ 13.624663] ? ktime_get_ts64+0x86/0x230 [ 13.624687] kunit_try_run_case+0x1a5/0x480 [ 13.624711] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.624756] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.624781] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.624816] ? __kthread_parkme+0x82/0x180 [ 13.624837] ? preempt_count_sub+0x50/0x80 [ 13.624860] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.624884] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.624909] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.624935] kthread+0x337/0x6f0 [ 13.624953] ? trace_preempt_on+0x20/0xc0 [ 13.624977] ? __pfx_kthread+0x10/0x10 [ 13.624997] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.625019] ? calculate_sigpending+0x7b/0xa0 [ 13.625044] ? __pfx_kthread+0x10/0x10 [ 13.625065] ret_from_fork+0x116/0x1d0 [ 13.625084] ? __pfx_kthread+0x10/0x10 [ 13.625104] ret_from_fork_asm+0x1a/0x30 [ 13.625135] </TASK> [ 13.625145] [ 13.636140] Allocated by task 217: [ 13.636274] kasan_save_stack+0x45/0x70 [ 13.636423] kasan_save_track+0x18/0x40 [ 13.636597] kasan_save_alloc_info+0x3b/0x50 [ 13.636996] __kasan_kmalloc+0xb7/0xc0 [ 13.637353] __kmalloc_cache_noprof+0x189/0x420 [ 13.637804] workqueue_uaf+0x152/0x560 [ 13.638138] kunit_try_run_case+0x1a5/0x480 [ 13.638620] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.639132] kthread+0x337/0x6f0 [ 13.639492] ret_from_fork+0x116/0x1d0 [ 13.639979] ret_from_fork_asm+0x1a/0x30 [ 13.640363] [ 13.640574] Freed by task 9: [ 13.640924] kasan_save_stack+0x45/0x70 [ 13.641358] kasan_save_track+0x18/0x40 [ 13.641754] kasan_save_free_info+0x3f/0x60 [ 13.642147] __kasan_slab_free+0x56/0x70 [ 13.642636] kfree+0x222/0x3f0 [ 13.642957] workqueue_uaf_work+0x12/0x20 [ 13.643371] process_one_work+0x5ee/0xf60 [ 13.643808] worker_thread+0x758/0x1220 [ 13.644180] kthread+0x337/0x6f0 [ 13.644577] ret_from_fork+0x116/0x1d0 [ 13.644973] ret_from_fork_asm+0x1a/0x30 [ 13.645401] [ 13.645587] Last potentially related work creation: [ 13.646017] kasan_save_stack+0x45/0x70 [ 13.646409] kasan_record_aux_stack+0xb2/0xc0 [ 13.646892] __queue_work+0x626/0xeb0 [ 13.647244] queue_work_on+0xb6/0xc0 [ 13.647664] workqueue_uaf+0x26d/0x560 [ 13.648066] kunit_try_run_case+0x1a5/0x480 [ 13.648534] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.649053] kthread+0x337/0x6f0 [ 13.649438] ret_from_fork+0x116/0x1d0 [ 13.649816] ret_from_fork_asm+0x1a/0x30 [ 13.650206] [ 13.650438] The buggy address belongs to the object at ffff888102a11780 [ 13.650438] which belongs to the cache kmalloc-32 of size 32 [ 13.651445] The buggy address is located 0 bytes inside of [ 13.651445] freed 32-byte region [ffff888102a11780, ffff888102a117a0) [ 13.652104] [ 13.652179] The buggy address belongs to the physical page: [ 13.652355] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102a11 [ 13.653174] flags: 0x200000000000000(node=0|zone=2) [ 13.653780] page_type: f5(slab) [ 13.654160] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 13.654925] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 13.655427] page dumped because: kasan: bad access detected [ 13.655834] [ 13.656014] Memory state around the buggy address: [ 13.656526] ffff888102a11680: fa fb fb fb fc fc fc fc 00 00 07 fc fc fc fc fc [ 13.657297] ffff888102a11700: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 13.657978] >ffff888102a11780: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 13.658506] ^ [ 13.658684] ffff888102a11800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.659344] ffff888102a11880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.659971] ==================================================================