Date
June 23, 2025, 7:07 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 33.652346] ================================================================== [ 33.652965] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 33.653412] Read of size 8 at addr fff00000c57bf600 by task kunit_try_catch/212 [ 33.653968] [ 33.654077] CPU: 1 UID: 0 PID: 212 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250623 #1 PREEMPT [ 33.654589] Tainted: [B]=BAD_PAGE, [N]=TEST [ 33.655072] Hardware name: linux,dummy-virt (DT) [ 33.655165] Call trace: [ 33.655793] show_stack+0x20/0x38 (C) [ 33.655972] dump_stack_lvl+0x8c/0xd0 [ 33.656159] print_report+0x118/0x608 [ 33.656487] kasan_report+0xdc/0x128 [ 33.656969] __asan_report_load8_noabort+0x20/0x30 [ 33.657351] workqueue_uaf+0x480/0x4a8 [ 33.657653] kunit_try_run_case+0x170/0x3f0 [ 33.657901] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.658207] kthread+0x328/0x630 [ 33.658676] ret_from_fork+0x10/0x20 [ 33.659214] [ 33.659272] Allocated by task 212: [ 33.659359] kasan_save_stack+0x3c/0x68 [ 33.659467] kasan_save_track+0x20/0x40 [ 33.659569] kasan_save_alloc_info+0x40/0x58 [ 33.659675] __kasan_kmalloc+0xd4/0xd8 [ 33.660321] __kmalloc_cache_noprof+0x16c/0x3c0 [ 33.661001] workqueue_uaf+0x13c/0x4a8 [ 33.661143] kunit_try_run_case+0x170/0x3f0 [ 33.661879] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.662525] kthread+0x328/0x630 [ 33.662627] ret_from_fork+0x10/0x20 [ 33.662730] [ 33.662795] Freed by task 24: [ 33.663519] kasan_save_stack+0x3c/0x68 [ 33.663678] kasan_save_track+0x20/0x40 [ 33.664231] kasan_save_free_info+0x4c/0x78 [ 33.664625] __kasan_slab_free+0x6c/0x98 [ 33.664739] kfree+0x214/0x3c8 [ 33.665073] workqueue_uaf_work+0x18/0x30 [ 33.665190] process_one_work+0x530/0xf98 [ 33.665490] worker_thread+0x618/0xf38 [ 33.665910] kthread+0x328/0x630 [ 33.666001] ret_from_fork+0x10/0x20 [ 33.666116] [ 33.666270] Last potentially related work creation: [ 33.666475] kasan_save_stack+0x3c/0x68 [ 33.666808] kasan_record_aux_stack+0xb4/0xc8 [ 33.667374] __queue_work+0x65c/0xfe0 [ 33.667554] queue_work_on+0xbc/0xf8 [ 33.667812] workqueue_uaf+0x210/0x4a8 [ 33.667935] kunit_try_run_case+0x170/0x3f0 [ 33.668051] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.668199] kthread+0x328/0x630 [ 33.668288] ret_from_fork+0x10/0x20 [ 33.668423] [ 33.668492] The buggy address belongs to the object at fff00000c57bf600 [ 33.668492] which belongs to the cache kmalloc-32 of size 32 [ 33.668626] The buggy address is located 0 bytes inside of [ 33.668626] freed 32-byte region [fff00000c57bf600, fff00000c57bf620) [ 33.668778] [ 33.668827] The buggy address belongs to the physical page: [ 33.668908] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1057bf [ 33.669049] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 33.669179] page_type: f5(slab) [ 33.669545] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 33.669730] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 33.669895] page dumped because: kasan: bad access detected [ 33.670004] [ 33.670070] Memory state around the buggy address: [ 33.670207] fff00000c57bf500: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 33.670324] fff00000c57bf580: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 33.670477] >fff00000c57bf600: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 33.670584] ^ [ 33.670907] fff00000c57bf680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.671043] fff00000c57bf700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.671141] ==================================================================
[ 22.444239] ================================================================== [ 22.444836] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 22.445246] Read of size 8 at addr ffff888102c09540 by task kunit_try_catch/229 [ 22.446084] [ 22.446271] CPU: 1 UID: 0 PID: 229 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250623 #1 PREEMPT(voluntary) [ 22.446362] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.446401] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.446437] Call Trace: [ 22.446459] <TASK> [ 22.446487] dump_stack_lvl+0x73/0xb0 [ 22.446539] print_report+0xd1/0x650 [ 22.446576] ? __virt_addr_valid+0x1db/0x2d0 [ 22.446616] ? workqueue_uaf+0x4d6/0x560 [ 22.446647] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.446692] ? workqueue_uaf+0x4d6/0x560 [ 22.446731] kasan_report+0x141/0x180 [ 22.446769] ? workqueue_uaf+0x4d6/0x560 [ 22.446809] __asan_report_load8_noabort+0x18/0x20 [ 22.447046] workqueue_uaf+0x4d6/0x560 [ 22.447109] ? __pfx_workqueue_uaf+0x10/0x10 [ 22.447146] ? __schedule+0x10cc/0x2b60 [ 22.447182] ? __pfx_read_tsc+0x10/0x10 [ 22.447220] ? ktime_get_ts64+0x86/0x230 [ 22.447264] kunit_try_run_case+0x1a5/0x480 [ 22.447305] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.447336] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 22.447369] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 22.447420] ? __kthread_parkme+0x82/0x180 [ 22.447452] ? preempt_count_sub+0x50/0x80 [ 22.447494] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.447530] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.447561] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 22.447590] kthread+0x337/0x6f0 [ 22.447615] ? trace_preempt_on+0x20/0xc0 [ 22.447645] ? __pfx_kthread+0x10/0x10 [ 22.447672] ? _raw_spin_unlock_irq+0x47/0x80 [ 22.447701] ? calculate_sigpending+0x7b/0xa0 [ 22.447731] ? __pfx_kthread+0x10/0x10 [ 22.447759] ret_from_fork+0x116/0x1d0 [ 22.447784] ? __pfx_kthread+0x10/0x10 [ 22.447811] ret_from_fork_asm+0x1a/0x30 [ 22.447866] </TASK> [ 22.447883] [ 22.456499] Allocated by task 229: [ 22.456724] kasan_save_stack+0x45/0x70 [ 22.457014] kasan_save_track+0x18/0x40 [ 22.457462] kasan_save_alloc_info+0x3b/0x50 [ 22.457644] __kasan_kmalloc+0xb7/0xc0 [ 22.457897] __kmalloc_cache_noprof+0x189/0x420 [ 22.458091] workqueue_uaf+0x152/0x560 [ 22.458330] kunit_try_run_case+0x1a5/0x480 [ 22.458495] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.458677] kthread+0x337/0x6f0 [ 22.458808] ret_from_fork+0x116/0x1d0 [ 22.458945] ret_from_fork_asm+0x1a/0x30 [ 22.459100] [ 22.459231] Freed by task 71: [ 22.459830] kasan_save_stack+0x45/0x70 [ 22.460308] kasan_save_track+0x18/0x40 [ 22.460628] kasan_save_free_info+0x3f/0x60 [ 22.460927] __kasan_slab_free+0x56/0x70 [ 22.461351] kfree+0x222/0x3f0 [ 22.461624] workqueue_uaf_work+0x12/0x20 [ 22.461891] process_one_work+0x5ee/0xf60 [ 22.462344] worker_thread+0x758/0x1220 [ 22.462666] kthread+0x337/0x6f0 [ 22.462812] ret_from_fork+0x116/0x1d0 [ 22.463068] ret_from_fork_asm+0x1a/0x30 [ 22.463655] [ 22.463746] Last potentially related work creation: [ 22.463893] kasan_save_stack+0x45/0x70 [ 22.464042] kasan_record_aux_stack+0xb2/0xc0 [ 22.464198] __queue_work+0x61a/0xe70 [ 22.464339] queue_work_on+0xb6/0xc0 [ 22.464605] workqueue_uaf+0x26d/0x560 [ 22.465094] kunit_try_run_case+0x1a5/0x480 [ 22.465427] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.465785] kthread+0x337/0x6f0 [ 22.466094] ret_from_fork+0x116/0x1d0 [ 22.466358] ret_from_fork_asm+0x1a/0x30 [ 22.466659] [ 22.466793] The buggy address belongs to the object at ffff888102c09540 [ 22.466793] which belongs to the cache kmalloc-32 of size 32 [ 22.467648] The buggy address is located 0 bytes inside of [ 22.467648] freed 32-byte region [ffff888102c09540, ffff888102c09560) [ 22.468349] [ 22.468466] The buggy address belongs to the physical page: [ 22.468640] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c09 [ 22.468878] flags: 0x200000000000000(node=0|zone=2) [ 22.469053] page_type: f5(slab) [ 22.469189] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 22.469465] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 22.470055] page dumped because: kasan: bad access detected [ 22.470461] [ 22.470612] Memory state around the buggy address: [ 22.471122] ffff888102c09400: 00 00 05 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 22.472094] ffff888102c09480: fa fb fb fb fc fc fc fc 00 00 07 fc fc fc fc fc [ 22.472435] >ffff888102c09500: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 22.472821] ^ [ 22.473397] ffff888102c09580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.473630] ffff888102c09600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.474259] ==================================================================