Date
July 5, 2025, 5:09 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.668686] ================================================================== [ 18.668754] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 18.668807] Read of size 8 at addr fff00000c77eb480 by task kunit_try_catch/200 [ 18.668857] [ 18.668903] CPU: 1 UID: 0 PID: 200 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 18.668985] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.669012] Hardware name: linux,dummy-virt (DT) [ 18.669042] Call trace: [ 18.669065] show_stack+0x20/0x38 (C) [ 18.669111] dump_stack_lvl+0x8c/0xd0 [ 18.669157] print_report+0x118/0x608 [ 18.669203] kasan_report+0xdc/0x128 [ 18.669248] __asan_report_load8_noabort+0x20/0x30 [ 18.669295] workqueue_uaf+0x480/0x4a8 [ 18.669341] kunit_try_run_case+0x170/0x3f0 [ 18.669426] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.669534] kthread+0x328/0x630 [ 18.669577] ret_from_fork+0x10/0x20 [ 18.669624] [ 18.669672] Allocated by task 200: [ 18.669727] kasan_save_stack+0x3c/0x68 [ 18.669770] kasan_save_track+0x20/0x40 [ 18.669828] kasan_save_alloc_info+0x40/0x58 [ 18.669917] __kasan_kmalloc+0xd4/0xd8 [ 18.669983] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.670026] workqueue_uaf+0x13c/0x4a8 [ 18.670060] kunit_try_run_case+0x170/0x3f0 [ 18.670099] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.670140] kthread+0x328/0x630 [ 18.670173] ret_from_fork+0x10/0x20 [ 18.670209] [ 18.670227] Freed by task 47: [ 18.670253] kasan_save_stack+0x3c/0x68 [ 18.670289] kasan_save_track+0x20/0x40 [ 18.670327] kasan_save_free_info+0x4c/0x78 [ 18.670366] __kasan_slab_free+0x6c/0x98 [ 18.670421] kfree+0x214/0x3c8 [ 18.670471] workqueue_uaf_work+0x18/0x30 [ 18.670527] process_one_work+0x530/0xf98 [ 18.670565] worker_thread+0x618/0xf38 [ 18.670600] kthread+0x328/0x630 [ 18.670631] ret_from_fork+0x10/0x20 [ 18.670667] [ 18.670686] Last potentially related work creation: [ 18.670722] kasan_save_stack+0x3c/0x68 [ 18.670970] kasan_record_aux_stack+0xb4/0xc8 [ 18.671017] __queue_work+0x65c/0x1008 [ 18.671054] queue_work_on+0xbc/0xf8 [ 18.671093] workqueue_uaf+0x210/0x4a8 [ 18.671129] kunit_try_run_case+0x170/0x3f0 [ 18.671166] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.671209] kthread+0x328/0x630 [ 18.671240] ret_from_fork+0x10/0x20 [ 18.671276] [ 18.671295] The buggy address belongs to the object at fff00000c77eb480 [ 18.671295] which belongs to the cache kmalloc-32 of size 32 [ 18.671352] The buggy address is located 0 bytes inside of [ 18.671352] freed 32-byte region [fff00000c77eb480, fff00000c77eb4a0) [ 18.671410] [ 18.671434] The buggy address belongs to the physical page: [ 18.671465] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1077eb [ 18.671515] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.671562] page_type: f5(slab) [ 18.671599] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.671647] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.671686] page dumped because: kasan: bad access detected [ 18.671717] [ 18.671734] Memory state around the buggy address: [ 18.671765] fff00000c77eb380: 00 00 07 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 18.671807] fff00000c77eb400: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.671848] >fff00000c77eb480: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.672307] ^ [ 18.672416] fff00000c77eb500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.672478] fff00000c77eb580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.672533] ==================================================================
[ 12.190076] ================================================================== [ 12.190824] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 12.191433] Read of size 8 at addr ffff8881038dc100 by task kunit_try_catch/218 [ 12.192164] [ 12.192360] CPU: 1 UID: 0 PID: 218 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 12.192406] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.192418] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.192440] Call Trace: [ 12.192463] <TASK> [ 12.192480] dump_stack_lvl+0x73/0xb0 [ 12.192509] print_report+0xd1/0x650 [ 12.192530] ? __virt_addr_valid+0x1db/0x2d0 [ 12.192552] ? workqueue_uaf+0x4d6/0x560 [ 12.192573] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.192595] ? workqueue_uaf+0x4d6/0x560 [ 12.192616] kasan_report+0x141/0x180 [ 12.192637] ? workqueue_uaf+0x4d6/0x560 [ 12.192663] __asan_report_load8_noabort+0x18/0x20 [ 12.192727] workqueue_uaf+0x4d6/0x560 [ 12.192751] ? __pfx_workqueue_uaf+0x10/0x10 [ 12.192773] ? __schedule+0x10cc/0x2b60 [ 12.192794] ? __pfx_read_tsc+0x10/0x10 [ 12.192815] ? ktime_get_ts64+0x86/0x230 [ 12.192838] kunit_try_run_case+0x1a5/0x480 [ 12.192862] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.192883] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.192906] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.192928] ? __kthread_parkme+0x82/0x180 [ 12.192947] ? preempt_count_sub+0x50/0x80 [ 12.192970] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.192993] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.193015] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.193037] kthread+0x337/0x6f0 [ 12.193056] ? trace_preempt_on+0x20/0xc0 [ 12.193078] ? __pfx_kthread+0x10/0x10 [ 12.193098] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.193119] ? calculate_sigpending+0x7b/0xa0 [ 12.193141] ? __pfx_kthread+0x10/0x10 [ 12.193162] ret_from_fork+0x116/0x1d0 [ 12.193179] ? __pfx_kthread+0x10/0x10 [ 12.193227] ret_from_fork_asm+0x1a/0x30 [ 12.193258] </TASK> [ 12.193269] [ 12.206066] Allocated by task 218: [ 12.206445] kasan_save_stack+0x45/0x70 [ 12.206859] kasan_save_track+0x18/0x40 [ 12.207128] kasan_save_alloc_info+0x3b/0x50 [ 12.207414] __kasan_kmalloc+0xb7/0xc0 [ 12.207793] __kmalloc_cache_noprof+0x189/0x420 [ 12.208191] workqueue_uaf+0x152/0x560 [ 12.208422] kunit_try_run_case+0x1a5/0x480 [ 12.208585] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.208918] kthread+0x337/0x6f0 [ 12.209213] ret_from_fork+0x116/0x1d0 [ 12.209656] ret_from_fork_asm+0x1a/0x30 [ 12.210048] [ 12.210205] Freed by task 41: [ 12.210659] kasan_save_stack+0x45/0x70 [ 12.211028] kasan_save_track+0x18/0x40 [ 12.211301] kasan_save_free_info+0x3f/0x60 [ 12.211467] __kasan_slab_free+0x56/0x70 [ 12.211614] kfree+0x222/0x3f0 [ 12.211759] workqueue_uaf_work+0x12/0x20 [ 12.212109] process_one_work+0x5ee/0xf60 [ 12.212530] worker_thread+0x758/0x1220 [ 12.212975] kthread+0x337/0x6f0 [ 12.213355] ret_from_fork+0x116/0x1d0 [ 12.213722] ret_from_fork_asm+0x1a/0x30 [ 12.214090] [ 12.214284] Last potentially related work creation: [ 12.214729] kasan_save_stack+0x45/0x70 [ 12.215086] kasan_record_aux_stack+0xb2/0xc0 [ 12.215405] __queue_work+0x626/0xeb0 [ 12.215764] queue_work_on+0xb6/0xc0 [ 12.216156] workqueue_uaf+0x26d/0x560 [ 12.216363] kunit_try_run_case+0x1a5/0x480 [ 12.216772] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.217035] kthread+0x337/0x6f0 [ 12.217157] ret_from_fork+0x116/0x1d0 [ 12.217522] ret_from_fork_asm+0x1a/0x30 [ 12.217903] [ 12.218072] The buggy address belongs to the object at ffff8881038dc100 [ 12.218072] which belongs to the cache kmalloc-32 of size 32 [ 12.219107] The buggy address is located 0 bytes inside of [ 12.219107] freed 32-byte region [ffff8881038dc100, ffff8881038dc120) [ 12.219944] [ 12.220124] The buggy address belongs to the physical page: [ 12.220845] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1038dc [ 12.221102] flags: 0x200000000000000(node=0|zone=2) [ 12.221465] page_type: f5(slab) [ 12.221778] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.222498] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.223294] page dumped because: kasan: bad access detected [ 12.223896] [ 12.224015] Memory state around the buggy address: [ 12.224175] ffff8881038dc000: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 12.224849] ffff8881038dc080: 00 00 07 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 12.225685] >ffff8881038dc100: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 12.226042] ^ [ 12.226161] ffff8881038dc180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.226878] ffff8881038dc200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.227570] ==================================================================