Date
July 15, 2025, 11:09 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 16.054779] ================================================================== [ 16.054861] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 16.054927] Read of size 8 at addr fff00000c5947200 by task kunit_try_catch/201 [ 16.054978] [ 16.055017] CPU: 1 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 16.055104] Tainted: [B]=BAD_PAGE, [N]=TEST [ 16.055140] Hardware name: linux,dummy-virt (DT) [ 16.055210] Call trace: [ 16.055236] show_stack+0x20/0x38 (C) [ 16.055293] dump_stack_lvl+0x8c/0xd0 [ 16.055343] print_report+0x118/0x5d0 [ 16.055389] kasan_report+0xdc/0x128 [ 16.055433] __asan_report_load8_noabort+0x20/0x30 [ 16.055483] workqueue_uaf+0x480/0x4a8 [ 16.055526] kunit_try_run_case+0x170/0x3f0 [ 16.055584] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.055636] kthread+0x328/0x630 [ 16.055677] ret_from_fork+0x10/0x20 [ 16.055734] [ 16.055752] Allocated by task 201: [ 16.055782] kasan_save_stack+0x3c/0x68 [ 16.055823] kasan_save_track+0x20/0x40 [ 16.055861] kasan_save_alloc_info+0x40/0x58 [ 16.055901] __kasan_kmalloc+0xd4/0xd8 [ 16.055945] __kmalloc_cache_noprof+0x16c/0x3c0 [ 16.055994] workqueue_uaf+0x13c/0x4a8 [ 16.056030] kunit_try_run_case+0x170/0x3f0 [ 16.056068] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.056111] kthread+0x328/0x630 [ 16.056141] ret_from_fork+0x10/0x20 [ 16.056177] [ 16.056203] Freed by task 58: [ 16.056229] kasan_save_stack+0x3c/0x68 [ 16.056265] kasan_save_track+0x20/0x40 [ 16.056302] kasan_save_free_info+0x4c/0x78 [ 16.056341] __kasan_slab_free+0x6c/0x98 [ 16.056377] kfree+0x214/0x3c8 [ 16.056408] workqueue_uaf_work+0x18/0x30 [ 16.056443] process_one_work+0x530/0xf98 [ 16.056484] worker_thread+0x618/0xf38 [ 16.056517] kthread+0x328/0x630 [ 16.056547] ret_from_fork+0x10/0x20 [ 16.056583] [ 16.056601] Last potentially related work creation: [ 16.056627] kasan_save_stack+0x3c/0x68 [ 16.056664] kasan_record_aux_stack+0xb4/0xc8 [ 16.056705] __queue_work+0x65c/0x1008 [ 16.056739] queue_work_on+0xbc/0xf8 [ 16.056773] workqueue_uaf+0x210/0x4a8 [ 16.056809] kunit_try_run_case+0x170/0x3f0 [ 16.056845] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.056888] kthread+0x328/0x630 [ 16.056918] ret_from_fork+0x10/0x20 [ 16.056987] [ 16.057016] The buggy address belongs to the object at fff00000c5947200 [ 16.057016] which belongs to the cache kmalloc-32 of size 32 [ 16.057115] The buggy address is located 0 bytes inside of [ 16.057115] freed 32-byte region [fff00000c5947200, fff00000c5947220) [ 16.057221] [ 16.057302] The buggy address belongs to the physical page: [ 16.057385] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105947 [ 16.057447] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 16.057618] page_type: f5(slab) [ 16.057735] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 16.057922] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 16.058024] page dumped because: kasan: bad access detected [ 16.058072] [ 16.058089] Memory state around the buggy address: [ 16.058172] fff00000c5947100: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 16.058244] fff00000c5947180: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 16.058288] >fff00000c5947200: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 16.058325] ^ [ 16.058352] fff00000c5947280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.058395] fff00000c5947300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.058434] ==================================================================
[ 13.169014] ================================================================== [ 13.169453] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 13.169955] Read of size 8 at addr ffff8881032ef880 by task kunit_try_catch/217 [ 13.170293] [ 13.170481] CPU: 1 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 13.170529] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.170540] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.170561] Call Trace: [ 13.170572] <TASK> [ 13.170587] dump_stack_lvl+0x73/0xb0 [ 13.170618] print_report+0xd1/0x610 [ 13.170640] ? __virt_addr_valid+0x1db/0x2d0 [ 13.170662] ? workqueue_uaf+0x4d6/0x560 [ 13.170683] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.170707] ? workqueue_uaf+0x4d6/0x560 [ 13.170728] kasan_report+0x141/0x180 [ 13.170750] ? workqueue_uaf+0x4d6/0x560 [ 13.170786] __asan_report_load8_noabort+0x18/0x20 [ 13.170812] workqueue_uaf+0x4d6/0x560 [ 13.170834] ? __pfx_workqueue_uaf+0x10/0x10 [ 13.170857] ? __schedule+0x10cc/0x2b60 [ 13.170879] ? __pfx_read_tsc+0x10/0x10 [ 13.170900] ? ktime_get_ts64+0x86/0x230 [ 13.170924] kunit_try_run_case+0x1a5/0x480 [ 13.170949] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.170972] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.170996] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.171020] ? __kthread_parkme+0x82/0x180 [ 13.171040] ? preempt_count_sub+0x50/0x80 [ 13.171064] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.171089] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.171113] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.171138] kthread+0x337/0x6f0 [ 13.171157] ? trace_preempt_on+0x20/0xc0 [ 13.171181] ? __pfx_kthread+0x10/0x10 [ 13.171201] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.171223] ? calculate_sigpending+0x7b/0xa0 [ 13.171247] ? __pfx_kthread+0x10/0x10 [ 13.171268] ret_from_fork+0x116/0x1d0 [ 13.171316] ? __pfx_kthread+0x10/0x10 [ 13.171354] ret_from_fork_asm+0x1a/0x30 [ 13.171386] </TASK> [ 13.171396] [ 13.179085] Allocated by task 217: [ 13.179224] kasan_save_stack+0x45/0x70 [ 13.179661] kasan_save_track+0x18/0x40 [ 13.180012] kasan_save_alloc_info+0x3b/0x50 [ 13.180224] __kasan_kmalloc+0xb7/0xc0 [ 13.180600] __kmalloc_cache_noprof+0x189/0x420 [ 13.180841] workqueue_uaf+0x152/0x560 [ 13.181021] kunit_try_run_case+0x1a5/0x480 [ 13.181168] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.181456] kthread+0x337/0x6f0 [ 13.181667] ret_from_fork+0x116/0x1d0 [ 13.181875] ret_from_fork_asm+0x1a/0x30 [ 13.182072] [ 13.182176] Freed by task 44: [ 13.182407] kasan_save_stack+0x45/0x70 [ 13.182618] kasan_save_track+0x18/0x40 [ 13.182834] kasan_save_free_info+0x3f/0x60 [ 13.183030] __kasan_slab_free+0x56/0x70 [ 13.183233] kfree+0x222/0x3f0 [ 13.183478] workqueue_uaf_work+0x12/0x20 [ 13.183673] process_one_work+0x5ee/0xf60 [ 13.183894] worker_thread+0x758/0x1220 [ 13.184071] kthread+0x337/0x6f0 [ 13.184243] ret_from_fork+0x116/0x1d0 [ 13.184564] ret_from_fork_asm+0x1a/0x30 [ 13.184793] [ 13.184902] Last potentially related work creation: [ 13.185125] kasan_save_stack+0x45/0x70 [ 13.185265] kasan_record_aux_stack+0xb2/0xc0 [ 13.185417] __queue_work+0x626/0xeb0 [ 13.185550] queue_work_on+0xb6/0xc0 [ 13.185680] workqueue_uaf+0x26d/0x560 [ 13.185946] kunit_try_run_case+0x1a5/0x480 [ 13.186160] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.186619] kthread+0x337/0x6f0 [ 13.186815] ret_from_fork+0x116/0x1d0 [ 13.187037] ret_from_fork_asm+0x1a/0x30 [ 13.187236] [ 13.187382] The buggy address belongs to the object at ffff8881032ef880 [ 13.187382] which belongs to the cache kmalloc-32 of size 32 [ 13.188059] The buggy address is located 0 bytes inside of [ 13.188059] freed 32-byte region [ffff8881032ef880, ffff8881032ef8a0) [ 13.188405] [ 13.188475] The buggy address belongs to the physical page: [ 13.188726] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1032ef [ 13.189096] flags: 0x200000000000000(node=0|zone=2) [ 13.189339] page_type: f5(slab) [ 13.189511] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 13.189976] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 13.190364] page dumped because: kasan: bad access detected [ 13.190668] [ 13.190895] Memory state around the buggy address: [ 13.191123] ffff8881032ef780: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 13.191507] ffff8881032ef800: 00 00 07 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 13.191785] >ffff8881032ef880: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 13.192128] ^ [ 13.192248] ffff8881032ef900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.192823] ffff8881032ef980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.193110] ==================================================================