Date
July 5, 2025, 11:09 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 19.617381] ================================================================== [ 19.617580] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 19.617737] Read of size 8 at addr fff00000c78abf40 by task kunit_try_catch/201 [ 19.617862] [ 19.617941] CPU: 0 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 19.618146] Tainted: [B]=BAD_PAGE, [N]=TEST [ 19.618206] Hardware name: linux,dummy-virt (DT) [ 19.618278] Call trace: [ 19.618334] show_stack+0x20/0x38 (C) [ 19.618518] dump_stack_lvl+0x8c/0xd0 [ 19.618622] print_report+0x118/0x608 [ 19.618733] kasan_report+0xdc/0x128 [ 19.618838] __asan_report_load8_noabort+0x20/0x30 [ 19.618909] workqueue_uaf+0x480/0x4a8 [ 19.619040] kunit_try_run_case+0x170/0x3f0 [ 19.619203] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.619313] kthread+0x328/0x630 [ 19.619411] ret_from_fork+0x10/0x20 [ 19.619823] [ 19.619878] Allocated by task 201: [ 19.619936] kasan_save_stack+0x3c/0x68 [ 19.620136] kasan_save_track+0x20/0x40 [ 19.620378] kasan_save_alloc_info+0x40/0x58 [ 19.620637] __kasan_kmalloc+0xd4/0xd8 [ 19.620726] __kmalloc_cache_noprof+0x16c/0x3c0 [ 19.620823] workqueue_uaf+0x13c/0x4a8 [ 19.621162] kunit_try_run_case+0x170/0x3f0 [ 19.621326] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.621437] kthread+0x328/0x630 [ 19.621705] ret_from_fork+0x10/0x20 [ 19.621885] [ 19.621938] Freed by task 9: [ 19.622003] kasan_save_stack+0x3c/0x68 [ 19.622076] kasan_save_track+0x20/0x40 [ 19.622155] kasan_save_free_info+0x4c/0x78 [ 19.622241] __kasan_slab_free+0x6c/0x98 [ 19.622333] kfree+0x214/0x3c8 [ 19.622430] workqueue_uaf_work+0x18/0x30 [ 19.622775] process_one_work+0x530/0xf98 [ 19.622880] worker_thread+0x618/0xf38 [ 19.623051] kthread+0x328/0x630 [ 19.623242] ret_from_fork+0x10/0x20 [ 19.623542] [ 19.623590] Last potentially related work creation: [ 19.623697] kasan_save_stack+0x3c/0x68 [ 19.623785] kasan_record_aux_stack+0xb4/0xc8 [ 19.623929] __queue_work+0x65c/0x1008 [ 19.624053] queue_work_on+0xbc/0xf8 [ 19.624234] workqueue_uaf+0x210/0x4a8 [ 19.624320] kunit_try_run_case+0x170/0x3f0 [ 19.624428] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.624525] kthread+0x328/0x630 [ 19.624606] ret_from_fork+0x10/0x20 [ 19.625122] [ 19.625178] The buggy address belongs to the object at fff00000c78abf40 [ 19.625178] which belongs to the cache kmalloc-32 of size 32 [ 19.625318] The buggy address is located 0 bytes inside of [ 19.625318] freed 32-byte region [fff00000c78abf40, fff00000c78abf60) [ 19.625486] [ 19.625537] The buggy address belongs to the physical page: [ 19.625605] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1078ab [ 19.626161] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 19.626340] page_type: f5(slab) [ 19.626562] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 19.626809] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 19.626932] page dumped because: kasan: bad access detected [ 19.626991] [ 19.627027] Memory state around the buggy address: [ 19.627314] fff00000c78abe00: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 19.627586] fff00000c78abe80: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 19.627699] >fff00000c78abf00: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 19.627786] ^ [ 19.628404] fff00000c78abf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.628547] fff00000c78ac000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 19.628643] ==================================================================
[ 14.311275] ================================================================== [ 14.311955] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 14.312391] Read of size 8 at addr ffff8881038d8880 by task kunit_try_catch/217 [ 14.312799] [ 14.312946] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 14.313009] Tainted: [B]=BAD_PAGE, [N]=TEST [ 14.313024] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 14.313054] Call Trace: [ 14.313070] <TASK> [ 14.313093] dump_stack_lvl+0x73/0xb0 [ 14.313129] print_report+0xd1/0x650 [ 14.313156] ? __virt_addr_valid+0x1db/0x2d0 [ 14.313184] ? workqueue_uaf+0x4d6/0x560 [ 14.313210] ? kasan_complete_mode_report_info+0x64/0x200 [ 14.313265] ? workqueue_uaf+0x4d6/0x560 [ 14.313308] kasan_report+0x141/0x180 [ 14.313335] ? workqueue_uaf+0x4d6/0x560 [ 14.313367] __asan_report_load8_noabort+0x18/0x20 [ 14.313413] workqueue_uaf+0x4d6/0x560 [ 14.313455] ? __pfx_workqueue_uaf+0x10/0x10 [ 14.313483] ? __schedule+0x10cc/0x2b60 [ 14.313510] ? __pfx_read_tsc+0x10/0x10 [ 14.313536] ? ktime_get_ts64+0x86/0x230 [ 14.313566] kunit_try_run_case+0x1a5/0x480 [ 14.313597] ? __pfx_kunit_try_run_case+0x10/0x10 [ 14.313623] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 14.313666] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 14.313694] ? __kthread_parkme+0x82/0x180 [ 14.313719] ? preempt_count_sub+0x50/0x80 [ 14.313748] ? __pfx_kunit_try_run_case+0x10/0x10 [ 14.313794] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.313822] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 14.313851] kthread+0x337/0x6f0 [ 14.313874] ? trace_preempt_on+0x20/0xc0 [ 14.313904] ? __pfx_kthread+0x10/0x10 [ 14.313928] ? _raw_spin_unlock_irq+0x47/0x80 [ 14.313954] ? calculate_sigpending+0x7b/0xa0 [ 14.313984] ? __pfx_kthread+0x10/0x10 [ 14.314010] ret_from_fork+0x116/0x1d0 [ 14.314033] ? __pfx_kthread+0x10/0x10 [ 14.314058] ret_from_fork_asm+0x1a/0x30 [ 14.314097] </TASK> [ 14.314111] [ 14.326025] Allocated by task 217: [ 14.326262] kasan_save_stack+0x45/0x70 [ 14.326453] kasan_save_track+0x18/0x40 [ 14.326683] kasan_save_alloc_info+0x3b/0x50 [ 14.326930] __kasan_kmalloc+0xb7/0xc0 [ 14.327254] __kmalloc_cache_noprof+0x189/0x420 [ 14.327733] workqueue_uaf+0x152/0x560 [ 14.327936] kunit_try_run_case+0x1a5/0x480 [ 14.328110] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.328645] kthread+0x337/0x6f0 [ 14.329074] ret_from_fork+0x116/0x1d0 [ 14.329247] ret_from_fork_asm+0x1a/0x30 [ 14.329756] [ 14.329945] Freed by task 9: [ 14.330140] kasan_save_stack+0x45/0x70 [ 14.330354] kasan_save_track+0x18/0x40 [ 14.330633] kasan_save_free_info+0x3f/0x60 [ 14.330923] __kasan_slab_free+0x56/0x70 [ 14.331145] kfree+0x222/0x3f0 [ 14.331379] workqueue_uaf_work+0x12/0x20 [ 14.331707] process_one_work+0x5ee/0xf60 [ 14.332046] worker_thread+0x758/0x1220 [ 14.332321] kthread+0x337/0x6f0 [ 14.332530] ret_from_fork+0x116/0x1d0 [ 14.332743] ret_from_fork_asm+0x1a/0x30 [ 14.332907] [ 14.333020] Last potentially related work creation: [ 14.333506] kasan_save_stack+0x45/0x70 [ 14.333731] kasan_record_aux_stack+0xb2/0xc0 [ 14.334035] __queue_work+0x626/0xeb0 [ 14.334286] queue_work_on+0xb6/0xc0 [ 14.334548] workqueue_uaf+0x26d/0x560 [ 14.334763] kunit_try_run_case+0x1a5/0x480 [ 14.335120] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.335338] kthread+0x337/0x6f0 [ 14.335492] ret_from_fork+0x116/0x1d0 [ 14.335772] ret_from_fork_asm+0x1a/0x30 [ 14.336263] [ 14.336593] The buggy address belongs to the object at ffff8881038d8880 [ 14.336593] which belongs to the cache kmalloc-32 of size 32 [ 14.337374] The buggy address is located 0 bytes inside of [ 14.337374] freed 32-byte region [ffff8881038d8880, ffff8881038d88a0) [ 14.338011] [ 14.338256] The buggy address belongs to the physical page: [ 14.338510] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1038d8 [ 14.338918] flags: 0x200000000000000(node=0|zone=2) [ 14.339541] page_type: f5(slab) [ 14.339762] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 14.340206] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 14.340476] page dumped because: kasan: bad access detected [ 14.340795] [ 14.340933] Memory state around the buggy address: [ 14.341359] ffff8881038d8780: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 14.341722] ffff8881038d8800: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 14.342051] >ffff8881038d8880: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 14.342475] ^ [ 14.342790] ffff8881038d8900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.343237] ffff8881038d8980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.343604] ==================================================================