Date
June 16, 2025, 7:07 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 19.986527] ================================================================== [ 19.986675] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 19.986857] Read of size 8 at addr fff00000c6406ac0 by task kunit_try_catch/209 [ 19.987009] [ 19.987122] CPU: 0 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc2-next-20250616 #1 PREEMPT [ 19.987340] Tainted: [B]=BAD_PAGE, [N]=TEST [ 19.987406] Hardware name: linux,dummy-virt (DT) [ 19.987482] Call trace: [ 19.987610] show_stack+0x20/0x38 (C) [ 19.987821] dump_stack_lvl+0x8c/0xd0 [ 19.988013] print_report+0x118/0x608 [ 19.988128] kasan_report+0xdc/0x128 [ 19.988239] __asan_report_load8_noabort+0x20/0x30 [ 19.988710] workqueue_uaf+0x480/0x4a8 [ 19.988864] kunit_try_run_case+0x170/0x3f0 [ 19.988974] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.989117] kthread+0x328/0x630 [ 19.989208] ret_from_fork+0x10/0x20 [ 19.989543] [ 19.989615] Allocated by task 209: [ 19.989701] kasan_save_stack+0x3c/0x68 [ 19.989787] kasan_save_track+0x20/0x40 [ 19.989920] kasan_save_alloc_info+0x40/0x58 [ 19.990009] __kasan_kmalloc+0xd4/0xd8 [ 19.990126] __kmalloc_cache_noprof+0x16c/0x3c0 [ 19.990253] workqueue_uaf+0x13c/0x4a8 [ 19.990344] kunit_try_run_case+0x170/0x3f0 [ 19.990448] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.990580] kthread+0x328/0x630 [ 19.990657] ret_from_fork+0x10/0x20 [ 19.990777] [ 19.990849] Freed by task 76: [ 19.990939] kasan_save_stack+0x3c/0x68 [ 19.991060] kasan_save_track+0x20/0x40 [ 19.991176] kasan_save_free_info+0x4c/0x78 [ 19.991268] __kasan_slab_free+0x6c/0x98 [ 19.991359] kfree+0x214/0x3c8 [ 19.991435] workqueue_uaf_work+0x18/0x30 [ 19.991521] process_one_work+0x530/0xf98 [ 19.991612] worker_thread+0x618/0xf38 [ 19.991694] kthread+0x328/0x630 [ 19.991773] ret_from_fork+0x10/0x20 [ 19.991866] [ 19.991910] Last potentially related work creation: [ 19.991963] kasan_save_stack+0x3c/0x68 [ 19.992316] kasan_record_aux_stack+0xb4/0xc8 [ 19.992500] __queue_work+0x65c/0xfe0 [ 19.992587] queue_work_on+0xbc/0xf8 [ 19.992668] workqueue_uaf+0x210/0x4a8 [ 19.992751] kunit_try_run_case+0x170/0x3f0 [ 19.993996] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.994117] kthread+0x328/0x630 [ 19.994202] ret_from_fork+0x10/0x20 [ 19.994382] [ 19.994444] The buggy address belongs to the object at fff00000c6406ac0 [ 19.994444] which belongs to the cache kmalloc-32 of size 32 [ 19.994599] The buggy address is located 0 bytes inside of [ 19.994599] freed 32-byte region [fff00000c6406ac0, fff00000c6406ae0) [ 19.994789] [ 19.994860] The buggy address belongs to the physical page: [ 19.994964] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106406 [ 19.995103] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 19.995227] page_type: f5(slab) [ 19.995337] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 19.995473] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 19.995583] page dumped because: kasan: bad access detected [ 19.995667] [ 19.995712] Memory state around the buggy address: [ 19.996408] fff00000c6406980: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 19.996989] fff00000c6406a00: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 19.997200] >fff00000c6406a80: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 19.997456] ^ [ 19.997576] fff00000c6406b00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.997990] fff00000c6406b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.998167] ==================================================================
[ 12.089095] ================================================================== [ 12.089499] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 12.090106] Read of size 8 at addr ffff888102a266c0 by task kunit_try_catch/225 [ 12.090469] [ 12.090588] CPU: 0 UID: 0 PID: 225 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc2-next-20250616 #1 PREEMPT(voluntary) [ 12.090636] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.090648] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.090667] Call Trace: [ 12.090680] <TASK> [ 12.090696] dump_stack_lvl+0x73/0xb0 [ 12.090726] print_report+0xd1/0x650 [ 12.090748] ? __virt_addr_valid+0x1db/0x2d0 [ 12.090769] ? workqueue_uaf+0x4d6/0x560 [ 12.090790] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.090811] ? workqueue_uaf+0x4d6/0x560 [ 12.090831] kasan_report+0x141/0x180 [ 12.090851] ? workqueue_uaf+0x4d6/0x560 [ 12.090876] __asan_report_load8_noabort+0x18/0x20 [ 12.090899] workqueue_uaf+0x4d6/0x560 [ 12.090920] ? __pfx_workqueue_uaf+0x10/0x10 [ 12.090953] ? __schedule+0x10cc/0x2b60 [ 12.090974] ? __pfx_read_tsc+0x10/0x10 [ 12.090995] ? ktime_get_ts64+0x86/0x230 [ 12.091020] kunit_try_run_case+0x1a5/0x480 [ 12.091043] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.091064] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.091085] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.091106] ? __kthread_parkme+0x82/0x180 [ 12.091126] ? preempt_count_sub+0x50/0x80 [ 12.091149] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.091172] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.091193] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.091215] kthread+0x337/0x6f0 [ 12.091234] ? trace_preempt_on+0x20/0xc0 [ 12.091257] ? __pfx_kthread+0x10/0x10 [ 12.091277] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.091296] ? calculate_sigpending+0x7b/0xa0 [ 12.091320] ? __pfx_kthread+0x10/0x10 [ 12.091341] ret_from_fork+0x116/0x1d0 [ 12.091358] ? __pfx_kthread+0x10/0x10 [ 12.091377] ret_from_fork_asm+0x1a/0x30 [ 12.091596] </TASK> [ 12.091611] [ 12.099195] Allocated by task 225: [ 12.099349] kasan_save_stack+0x45/0x70 [ 12.099495] kasan_save_track+0x18/0x40 [ 12.099723] kasan_save_alloc_info+0x3b/0x50 [ 12.099957] __kasan_kmalloc+0xb7/0xc0 [ 12.100142] __kmalloc_cache_noprof+0x189/0x420 [ 12.100340] workqueue_uaf+0x152/0x560 [ 12.100879] kunit_try_run_case+0x1a5/0x480 [ 12.101047] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.101225] kthread+0x337/0x6f0 [ 12.101961] ret_from_fork+0x116/0x1d0 [ 12.102444] ret_from_fork_asm+0x1a/0x30 [ 12.103058] [ 12.103224] Freed by task 9: [ 12.103332] kasan_save_stack+0x45/0x70 [ 12.103474] kasan_save_track+0x18/0x40 [ 12.103603] kasan_save_free_info+0x3f/0x60 [ 12.103742] __kasan_slab_free+0x56/0x70 [ 12.103869] kfree+0x222/0x3f0 [ 12.104564] workqueue_uaf_work+0x12/0x20 [ 12.105423] process_one_work+0x5ee/0xf60 [ 12.106002] worker_thread+0x758/0x1220 [ 12.106509] kthread+0x337/0x6f0 [ 12.106703] ret_from_fork+0x116/0x1d0 [ 12.107844] ret_from_fork_asm+0x1a/0x30 [ 12.108267] [ 12.108509] Last potentially related work creation: [ 12.108690] kasan_save_stack+0x45/0x70 [ 12.108927] kasan_record_aux_stack+0xb2/0xc0 [ 12.109140] __queue_work+0x61a/0xe70 [ 12.109370] queue_work_on+0xb6/0xc0 [ 12.109760] workqueue_uaf+0x26d/0x560 [ 12.109948] kunit_try_run_case+0x1a5/0x480 [ 12.110119] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.110368] kthread+0x337/0x6f0 [ 12.110593] ret_from_fork+0x116/0x1d0 [ 12.110726] ret_from_fork_asm+0x1a/0x30 [ 12.110915] [ 12.111077] The buggy address belongs to the object at ffff888102a266c0 [ 12.111077] which belongs to the cache kmalloc-32 of size 32 [ 12.112091] The buggy address is located 0 bytes inside of [ 12.112091] freed 32-byte region [ffff888102a266c0, ffff888102a266e0) [ 12.112685] [ 12.112869] The buggy address belongs to the physical page: [ 12.113254] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102a26 [ 12.113768] flags: 0x200000000000000(node=0|zone=2) [ 12.114051] page_type: f5(slab) [ 12.114213] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.114609] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.114941] page dumped because: kasan: bad access detected [ 12.115125] [ 12.115213] Memory state around the buggy address: [ 12.115493] ffff888102a26580: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 12.115801] ffff888102a26600: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 12.116132] >ffff888102a26680: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 12.116414] ^ [ 12.116646] ffff888102a26700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.117051] ffff888102a26780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.117340] ==================================================================