Date
June 19, 2025, 12:07 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.191351] ================================================================== [ 31.191559] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 31.192890] Read of size 8 at addr fff00000c771ef40 by task kunit_try_catch/211 [ 31.193476] [ 31.193584] CPU: 1 UID: 0 PID: 211 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc2-next-20250619 #1 PREEMPT [ 31.193863] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.193949] Hardware name: linux,dummy-virt (DT) [ 31.194022] Call trace: [ 31.194076] show_stack+0x20/0x38 (C) [ 31.194209] dump_stack_lvl+0x8c/0xd0 [ 31.194313] print_report+0x118/0x608 [ 31.194435] kasan_report+0xdc/0x128 [ 31.194532] __asan_report_load8_noabort+0x20/0x30 [ 31.194641] workqueue_uaf+0x480/0x4a8 [ 31.194746] kunit_try_run_case+0x170/0x3f0 [ 31.194836] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.194967] kthread+0x328/0x630 [ 31.195089] ret_from_fork+0x10/0x20 [ 31.195213] [ 31.195257] Allocated by task 211: [ 31.195330] kasan_save_stack+0x3c/0x68 [ 31.195481] kasan_save_track+0x20/0x40 [ 31.195605] kasan_save_alloc_info+0x40/0x58 [ 31.195708] __kasan_kmalloc+0xd4/0xd8 [ 31.195805] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.195917] workqueue_uaf+0x13c/0x4a8 [ 31.196012] kunit_try_run_case+0x170/0x3f0 [ 31.196123] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.196216] kthread+0x328/0x630 [ 31.196290] ret_from_fork+0x10/0x20 [ 31.196385] [ 31.196435] Freed by task 32: [ 31.196508] kasan_save_stack+0x3c/0x68 [ 31.196637] kasan_save_track+0x20/0x40 [ 31.196737] kasan_save_free_info+0x4c/0x78 [ 31.196868] __kasan_slab_free+0x6c/0x98 [ 31.196996] kfree+0x214/0x3c8 [ 31.197100] workqueue_uaf_work+0x18/0x30 [ 31.197181] process_one_work+0x530/0xf98 [ 31.197297] worker_thread+0x618/0xf38 [ 31.197373] kthread+0x328/0x630 [ 31.197574] ret_from_fork+0x10/0x20 [ 31.197654] [ 31.197756] Last potentially related work creation: [ 31.197817] kasan_save_stack+0x3c/0x68 [ 31.197927] kasan_record_aux_stack+0xb4/0xc8 [ 31.198070] __queue_work+0x65c/0xfe0 [ 31.198179] queue_work_on+0xbc/0xf8 [ 31.198378] workqueue_uaf+0x210/0x4a8 [ 31.198535] kunit_try_run_case+0x170/0x3f0 [ 31.198673] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.198799] kthread+0x328/0x630 [ 31.198900] ret_from_fork+0x10/0x20 [ 31.199003] [ 31.199852] The buggy address belongs to the object at fff00000c771ef40 [ 31.199852] which belongs to the cache kmalloc-32 of size 32 [ 31.200080] The buggy address is located 0 bytes inside of [ 31.200080] freed 32-byte region [fff00000c771ef40, fff00000c771ef60) [ 31.200451] [ 31.200519] The buggy address belongs to the physical page: [ 31.200611] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10771e [ 31.200753] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.200892] page_type: f5(slab) [ 31.201241] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 31.202009] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 31.202125] page dumped because: kasan: bad access detected [ 31.202200] [ 31.202244] Memory state around the buggy address: [ 31.202348] fff00000c771ee00: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 31.202504] fff00000c771ee80: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 31.202640] >fff00000c771ef00: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 31.202740] ^ [ 31.202824] fff00000c771ef80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.202926] fff00000c771f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.203013] ==================================================================
[ 27.735617] ================================================================== [ 27.736738] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 27.737124] Read of size 8 at addr ffff88810325e500 by task kunit_try_catch/229 [ 27.737628] [ 27.737865] CPU: 0 UID: 0 PID: 229 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc2-next-20250619 #1 PREEMPT(voluntary) [ 27.737968] Tainted: [B]=BAD_PAGE, [N]=TEST [ 27.737992] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 27.738032] Call Trace: [ 27.738061] <TASK> [ 27.738115] dump_stack_lvl+0x73/0xb0 [ 27.738194] print_report+0xd1/0x650 [ 27.738246] ? __virt_addr_valid+0x1db/0x2d0 [ 27.738303] ? workqueue_uaf+0x4d6/0x560 [ 27.738340] ? kasan_complete_mode_report_info+0x64/0x200 [ 27.738388] ? workqueue_uaf+0x4d6/0x560 [ 27.738430] kasan_report+0x141/0x180 [ 27.738518] ? workqueue_uaf+0x4d6/0x560 [ 27.738574] __asan_report_load8_noabort+0x18/0x20 [ 27.738640] workqueue_uaf+0x4d6/0x560 [ 27.738683] ? __pfx_workqueue_uaf+0x10/0x10 [ 27.738722] ? __schedule+0x10cc/0x2b60 [ 27.738761] ? __pfx_read_tsc+0x10/0x10 [ 27.738798] ? ktime_get_ts64+0x86/0x230 [ 27.738843] kunit_try_run_case+0x1a5/0x480 [ 27.738891] ? __pfx_kunit_try_run_case+0x10/0x10 [ 27.738948] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 27.739004] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 27.739047] ? __kthread_parkme+0x82/0x180 [ 27.739089] ? preempt_count_sub+0x50/0x80 [ 27.739153] ? __pfx_kunit_try_run_case+0x10/0x10 [ 27.739228] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.739274] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 27.739317] kthread+0x337/0x6f0 [ 27.739356] ? trace_preempt_on+0x20/0xc0 [ 27.739409] ? __pfx_kthread+0x10/0x10 [ 27.739455] ? _raw_spin_unlock_irq+0x47/0x80 [ 27.739501] ? calculate_sigpending+0x7b/0xa0 [ 27.739554] ? __pfx_kthread+0x10/0x10 [ 27.739598] ret_from_fork+0x116/0x1d0 [ 27.739638] ? __pfx_kthread+0x10/0x10 [ 27.739679] ret_from_fork_asm+0x1a/0x30 [ 27.739765] </TASK> [ 27.739789] [ 27.749878] Allocated by task 229: [ 27.750485] kasan_save_stack+0x45/0x70 [ 27.750871] kasan_save_track+0x18/0x40 [ 27.751461] kasan_save_alloc_info+0x3b/0x50 [ 27.751862] __kasan_kmalloc+0xb7/0xc0 [ 27.752311] __kmalloc_cache_noprof+0x189/0x420 [ 27.752712] workqueue_uaf+0x152/0x560 [ 27.752957] kunit_try_run_case+0x1a5/0x480 [ 27.753413] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.753702] kthread+0x337/0x6f0 [ 27.753888] ret_from_fork+0x116/0x1d0 [ 27.754310] ret_from_fork_asm+0x1a/0x30 [ 27.754675] [ 27.754841] Freed by task 9: [ 27.755259] kasan_save_stack+0x45/0x70 [ 27.755497] kasan_save_track+0x18/0x40 [ 27.755807] kasan_save_free_info+0x3f/0x60 [ 27.756155] __kasan_slab_free+0x56/0x70 [ 27.756681] kfree+0x222/0x3f0 [ 27.756903] workqueue_uaf_work+0x12/0x20 [ 27.757247] process_one_work+0x5ee/0xf60 [ 27.757617] worker_thread+0x758/0x1220 [ 27.758013] kthread+0x337/0x6f0 [ 27.758316] ret_from_fork+0x116/0x1d0 [ 27.758770] ret_from_fork_asm+0x1a/0x30 [ 27.759302] [ 27.759452] Last potentially related work creation: [ 27.759643] kasan_save_stack+0x45/0x70 [ 27.759830] kasan_record_aux_stack+0xb2/0xc0 [ 27.760173] __queue_work+0x61a/0xe70 [ 27.760534] queue_work_on+0xb6/0xc0 [ 27.760955] workqueue_uaf+0x26d/0x560 [ 27.761297] kunit_try_run_case+0x1a5/0x480 [ 27.761770] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.762574] kthread+0x337/0x6f0 [ 27.762899] ret_from_fork+0x116/0x1d0 [ 27.763118] ret_from_fork_asm+0x1a/0x30 [ 27.763339] [ 27.763448] The buggy address belongs to the object at ffff88810325e500 [ 27.763448] which belongs to the cache kmalloc-32 of size 32 [ 27.763965] The buggy address is located 0 bytes inside of [ 27.763965] freed 32-byte region [ffff88810325e500, ffff88810325e520) [ 27.765181] [ 27.765380] The buggy address belongs to the physical page: [ 27.765821] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10325e [ 27.766480] flags: 0x200000000000000(node=0|zone=2) [ 27.766809] page_type: f5(slab) [ 27.767200] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 27.767577] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 27.767853] page dumped because: kasan: bad access detected [ 27.768058] [ 27.768173] Memory state around the buggy address: [ 27.768380] ffff88810325e400: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 27.768643] ffff88810325e480: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 27.768900] >ffff88810325e500: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 27.769359] ^ [ 27.769684] ffff88810325e580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.770278] ffff88810325e600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.770893] ==================================================================