Date
July 16, 2025, 12:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.013428] ================================================================== [ 31.013489] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 31.013601] Read of size 8 at addr fff00000c9a5f000 by task kunit_try_catch/231 [ 31.013654] [ 31.013748] CPU: 0 UID: 0 PID: 231 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250716 #1 PREEMPT [ 31.013837] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.013864] Hardware name: linux,dummy-virt (DT) [ 31.013897] Call trace: [ 31.013972] show_stack+0x20/0x38 (C) [ 31.014048] dump_stack_lvl+0x8c/0xd0 [ 31.014129] print_report+0x118/0x5d0 [ 31.014181] kasan_report+0xdc/0x128 [ 31.014224] __asan_report_load8_noabort+0x20/0x30 [ 31.014274] workqueue_uaf+0x480/0x4a8 [ 31.014325] kunit_try_run_case+0x170/0x3f0 [ 31.014477] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.014543] kthread+0x328/0x630 [ 31.014585] ret_from_fork+0x10/0x20 [ 31.014642] [ 31.014704] Allocated by task 231: [ 31.014763] kasan_save_stack+0x3c/0x68 [ 31.014803] kasan_save_track+0x20/0x40 [ 31.014866] kasan_save_alloc_info+0x40/0x58 [ 31.014912] __kasan_kmalloc+0xd4/0xd8 [ 31.014958] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.015033] workqueue_uaf+0x13c/0x4a8 [ 31.015109] kunit_try_run_case+0x170/0x3f0 [ 31.015164] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.015250] kthread+0x328/0x630 [ 31.015308] ret_from_fork+0x10/0x20 [ 31.015344] [ 31.015362] Freed by task 75: [ 31.015459] kasan_save_stack+0x3c/0x68 [ 31.015531] kasan_save_track+0x20/0x40 [ 31.015566] kasan_save_free_info+0x4c/0x78 [ 31.015604] __kasan_slab_free+0x6c/0x98 [ 31.015653] kfree+0x214/0x3c8 [ 31.015697] workqueue_uaf_work+0x18/0x30 [ 31.015734] process_one_work+0x530/0xf98 [ 31.015782] worker_thread+0x618/0xf38 [ 31.015837] kthread+0x328/0x630 [ 31.015872] ret_from_fork+0x10/0x20 [ 31.015908] [ 31.015926] Last potentially related work creation: [ 31.016127] kasan_save_stack+0x3c/0x68 [ 31.016267] kasan_record_aux_stack+0xb4/0xc8 [ 31.016331] __queue_work+0x65c/0xfe0 [ 31.016492] queue_work_on+0xbc/0xf8 [ 31.016626] workqueue_uaf+0x210/0x4a8 [ 31.016712] kunit_try_run_case+0x170/0x3f0 [ 31.016770] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.016950] kthread+0x328/0x630 [ 31.016983] ret_from_fork+0x10/0x20 [ 31.017019] [ 31.017037] The buggy address belongs to the object at fff00000c9a5f000 [ 31.017037] which belongs to the cache kmalloc-32 of size 32 [ 31.017098] The buggy address is located 0 bytes inside of [ 31.017098] freed 32-byte region [fff00000c9a5f000, fff00000c9a5f020) [ 31.017176] [ 31.017196] The buggy address belongs to the physical page: [ 31.017228] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109a5f [ 31.017280] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.017330] page_type: f5(slab) [ 31.017368] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 31.017476] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 31.017655] page dumped because: kasan: bad access detected [ 31.017732] [ 31.017920] Memory state around the buggy address: [ 31.018031] fff00000c9a5ef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.018140] fff00000c9a5ef80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.018258] >fff00000c9a5f000: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 31.018370] ^ [ 31.018397] fff00000c9a5f080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.018450] fff00000c9a5f100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.018498] ==================================================================
[ 23.893209] ================================================================== [ 23.894032] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 23.894331] Read of size 8 at addr ffff8881053ad6c0 by task kunit_try_catch/249 [ 23.894598] [ 23.894717] CPU: 0 UID: 0 PID: 249 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250716 #1 PREEMPT(voluntary) [ 23.894771] Tainted: [B]=BAD_PAGE, [N]=TEST [ 23.894783] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 23.894806] Call Trace: [ 23.894821] <TASK> [ 23.894841] dump_stack_lvl+0x73/0xb0 [ 23.894947] print_report+0xd1/0x610 [ 23.894972] ? __virt_addr_valid+0x1db/0x2d0 [ 23.894999] ? workqueue_uaf+0x4d6/0x560 [ 23.895019] ? kasan_complete_mode_report_info+0x64/0x200 [ 23.895044] ? workqueue_uaf+0x4d6/0x560 [ 23.895066] kasan_report+0x141/0x180 [ 23.895087] ? workqueue_uaf+0x4d6/0x560 [ 23.895112] __asan_report_load8_noabort+0x18/0x20 [ 23.895136] workqueue_uaf+0x4d6/0x560 [ 23.895158] ? __pfx_workqueue_uaf+0x10/0x10 [ 23.895180] ? __schedule+0x10c6/0x2b60 [ 23.895204] ? __pfx_read_tsc+0x10/0x10 [ 23.895227] ? ktime_get_ts64+0x86/0x230 [ 23.895253] kunit_try_run_case+0x1a5/0x480 [ 23.895292] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.895314] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 23.895337] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 23.895360] ? __kthread_parkme+0x82/0x180 [ 23.895381] ? preempt_count_sub+0x50/0x80 [ 23.895405] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.895428] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.895454] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 23.895481] kthread+0x337/0x6f0 [ 23.895501] ? trace_preempt_on+0x20/0xc0 [ 23.895527] ? __pfx_kthread+0x10/0x10 [ 23.895547] ? _raw_spin_unlock_irq+0x47/0x80 [ 23.895567] ? calculate_sigpending+0x7b/0xa0 [ 23.895591] ? __pfx_kthread+0x10/0x10 [ 23.895612] ret_from_fork+0x116/0x1d0 [ 23.895631] ? __pfx_kthread+0x10/0x10 [ 23.895650] ret_from_fork_asm+0x1a/0x30 [ 23.895682] </TASK> [ 23.895693] [ 23.912692] Allocated by task 249: [ 23.913251] kasan_save_stack+0x45/0x70 [ 23.913471] kasan_save_track+0x18/0x40 [ 23.913841] kasan_save_alloc_info+0x3b/0x50 [ 23.914101] __kasan_kmalloc+0xb7/0xc0 [ 23.914237] __kmalloc_cache_noprof+0x189/0x420 [ 23.914470] workqueue_uaf+0x152/0x560 [ 23.914824] kunit_try_run_case+0x1a5/0x480 [ 23.915082] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.915492] kthread+0x337/0x6f0 [ 23.915670] ret_from_fork+0x116/0x1d0 [ 23.915851] ret_from_fork_asm+0x1a/0x30 [ 23.916252] [ 23.916348] Freed by task 9: [ 23.916491] kasan_save_stack+0x45/0x70 [ 23.916679] kasan_save_track+0x18/0x40 [ 23.917108] kasan_save_free_info+0x3f/0x60 [ 23.917297] __kasan_slab_free+0x56/0x70 [ 23.917485] kfree+0x222/0x3f0 [ 23.917627] workqueue_uaf_work+0x12/0x20 [ 23.917876] process_one_work+0x5ee/0xf60 [ 23.918480] worker_thread+0x758/0x1220 [ 23.918672] kthread+0x337/0x6f0 [ 23.919125] ret_from_fork+0x116/0x1d0 [ 23.919292] ret_from_fork_asm+0x1a/0x30 [ 23.919668] [ 23.919771] Last potentially related work creation: [ 23.920192] kasan_save_stack+0x45/0x70 [ 23.920358] kasan_record_aux_stack+0xb2/0xc0 [ 23.920579] __queue_work+0x61a/0xe70 [ 23.920724] queue_work_on+0xb6/0xc0 [ 23.920932] workqueue_uaf+0x26d/0x560 [ 23.921371] kunit_try_run_case+0x1a5/0x480 [ 23.921577] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.921989] kthread+0x337/0x6f0 [ 23.922273] ret_from_fork+0x116/0x1d0 [ 23.922425] ret_from_fork_asm+0x1a/0x30 [ 23.922562] [ 23.922628] The buggy address belongs to the object at ffff8881053ad6c0 [ 23.922628] which belongs to the cache kmalloc-32 of size 32 [ 23.923004] The buggy address is located 0 bytes inside of [ 23.923004] freed 32-byte region [ffff8881053ad6c0, ffff8881053ad6e0) [ 23.923824] [ 23.924338] The buggy address belongs to the physical page: [ 23.924551] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1053ad [ 23.924869] flags: 0x200000000000000(node=0|zone=2) [ 23.925217] page_type: f5(slab) [ 23.925383] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 23.925867] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 23.926362] page dumped because: kasan: bad access detected [ 23.926558] [ 23.926842] Memory state around the buggy address: [ 23.927081] ffff8881053ad580: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 23.927578] ffff8881053ad600: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 23.928191] >ffff8881053ad680: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 23.928494] ^ [ 23.928804] ffff8881053ad700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.929203] ffff8881053ad780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.929531] ==================================================================