Date
July 6, 2025, 11:09 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.547878] ================================================================== [ 18.547943] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 18.548012] Read of size 8 at addr fff00000c56eb640 by task kunit_try_catch/200 [ 18.548061] [ 18.548094] CPU: 1 UID: 0 PID: 200 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 18.548188] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.548229] Hardware name: linux,dummy-virt (DT) [ 18.548261] Call trace: [ 18.548282] show_stack+0x20/0x38 (C) [ 18.548332] dump_stack_lvl+0x8c/0xd0 [ 18.548379] print_report+0x118/0x608 [ 18.548425] kasan_report+0xdc/0x128 [ 18.548470] __asan_report_load8_noabort+0x20/0x30 [ 18.548517] workqueue_uaf+0x480/0x4a8 [ 18.548561] kunit_try_run_case+0x170/0x3f0 [ 18.548701] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.548767] kthread+0x328/0x630 [ 18.548808] ret_from_fork+0x10/0x20 [ 18.548855] [ 18.548875] Allocated by task 200: [ 18.548904] kasan_save_stack+0x3c/0x68 [ 18.548945] kasan_save_track+0x20/0x40 [ 18.548983] kasan_save_alloc_info+0x40/0x58 [ 18.549024] __kasan_kmalloc+0xd4/0xd8 [ 18.549059] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.549099] workqueue_uaf+0x13c/0x4a8 [ 18.549134] kunit_try_run_case+0x170/0x3f0 [ 18.549172] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.549225] kthread+0x328/0x630 [ 18.549258] ret_from_fork+0x10/0x20 [ 18.549873] [ 18.549918] Freed by task 24: [ 18.549947] kasan_save_stack+0x3c/0x68 [ 18.549989] kasan_save_track+0x20/0x40 [ 18.550027] kasan_save_free_info+0x4c/0x78 [ 18.550065] __kasan_slab_free+0x6c/0x98 [ 18.550238] kfree+0x214/0x3c8 [ 18.550316] workqueue_uaf_work+0x18/0x30 [ 18.550415] process_one_work+0x530/0xf98 [ 18.550571] worker_thread+0x618/0xf38 [ 18.550704] kthread+0x328/0x630 [ 18.550772] ret_from_fork+0x10/0x20 [ 18.550809] [ 18.550827] Last potentially related work creation: [ 18.550852] kasan_save_stack+0x3c/0x68 [ 18.550891] kasan_record_aux_stack+0xb4/0xc8 [ 18.551109] __queue_work+0x65c/0x1008 [ 18.551235] queue_work_on+0xbc/0xf8 [ 18.551327] workqueue_uaf+0x210/0x4a8 [ 18.551364] kunit_try_run_case+0x170/0x3f0 [ 18.551638] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.551775] kthread+0x328/0x630 [ 18.551871] ret_from_fork+0x10/0x20 [ 18.551992] [ 18.552012] The buggy address belongs to the object at fff00000c56eb640 [ 18.552012] which belongs to the cache kmalloc-32 of size 32 [ 18.552306] The buggy address is located 0 bytes inside of [ 18.552306] freed 32-byte region [fff00000c56eb640, fff00000c56eb660) [ 18.552470] [ 18.552594] The buggy address belongs to the physical page: [ 18.552681] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1056eb [ 18.552734] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.553001] page_type: f5(slab) [ 18.553093] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.553202] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.553286] page dumped because: kasan: bad access detected [ 18.553383] [ 18.553401] Memory state around the buggy address: [ 18.553434] fff00000c56eb500: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 18.553704] fff00000c56eb580: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.553789] >fff00000c56eb600: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 18.553889] ^ [ 18.553958] fff00000c56eb680: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.554069] fff00000c56eb700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.554130] ==================================================================
[ 12.229055] ================================================================== [ 12.229689] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 12.230431] Read of size 8 at addr ffff88810279d640 by task kunit_try_catch/217 [ 12.230928] [ 12.231137] CPU: 1 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 12.231186] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.231198] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.231219] Call Trace: [ 12.231233] <TASK> [ 12.231252] dump_stack_lvl+0x73/0xb0 [ 12.231284] print_report+0xd1/0x650 [ 12.231308] ? __virt_addr_valid+0x1db/0x2d0 [ 12.231333] ? workqueue_uaf+0x4d6/0x560 [ 12.231353] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.231374] ? workqueue_uaf+0x4d6/0x560 [ 12.231395] kasan_report+0x141/0x180 [ 12.231417] ? workqueue_uaf+0x4d6/0x560 [ 12.231442] __asan_report_load8_noabort+0x18/0x20 [ 12.231636] workqueue_uaf+0x4d6/0x560 [ 12.231679] ? __pfx_workqueue_uaf+0x10/0x10 [ 12.231702] ? __schedule+0x10cc/0x2b60 [ 12.231726] ? __pfx_read_tsc+0x10/0x10 [ 12.231748] ? ktime_get_ts64+0x86/0x230 [ 12.231773] kunit_try_run_case+0x1a5/0x480 [ 12.231798] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.231819] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 12.231843] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.231865] ? __kthread_parkme+0x82/0x180 [ 12.231885] ? preempt_count_sub+0x50/0x80 [ 12.231909] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.231943] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.231965] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.231987] kthread+0x337/0x6f0 [ 12.232006] ? trace_preempt_on+0x20/0xc0 [ 12.232030] ? __pfx_kthread+0x10/0x10 [ 12.232049] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.232069] ? calculate_sigpending+0x7b/0xa0 [ 12.232093] ? __pfx_kthread+0x10/0x10 [ 12.232114] ret_from_fork+0x116/0x1d0 [ 12.232132] ? __pfx_kthread+0x10/0x10 [ 12.232151] ret_from_fork_asm+0x1a/0x30 [ 12.232183] </TASK> [ 12.232194] [ 12.244509] Allocated by task 217: [ 12.244661] kasan_save_stack+0x45/0x70 [ 12.244814] kasan_save_track+0x18/0x40 [ 12.244960] kasan_save_alloc_info+0x3b/0x50 [ 12.245118] __kasan_kmalloc+0xb7/0xc0 [ 12.245305] __kmalloc_cache_noprof+0x189/0x420 [ 12.245561] workqueue_uaf+0x152/0x560 [ 12.245698] kunit_try_run_case+0x1a5/0x480 [ 12.245843] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.246388] kthread+0x337/0x6f0 [ 12.246777] ret_from_fork+0x116/0x1d0 [ 12.247160] ret_from_fork_asm+0x1a/0x30 [ 12.247682] [ 12.247849] Freed by task 24: [ 12.248164] kasan_save_stack+0x45/0x70 [ 12.248578] kasan_save_track+0x18/0x40 [ 12.248719] kasan_save_free_info+0x3f/0x60 [ 12.248864] __kasan_slab_free+0x56/0x70 [ 12.249015] kfree+0x222/0x3f0 [ 12.249322] workqueue_uaf_work+0x12/0x20 [ 12.249739] process_one_work+0x5ee/0xf60 [ 12.250147] worker_thread+0x758/0x1220 [ 12.250577] kthread+0x337/0x6f0 [ 12.250874] ret_from_fork+0x116/0x1d0 [ 12.251253] ret_from_fork_asm+0x1a/0x30 [ 12.251683] [ 12.251763] Last potentially related work creation: [ 12.251919] kasan_save_stack+0x45/0x70 [ 12.252076] kasan_record_aux_stack+0xb2/0xc0 [ 12.252360] __queue_work+0x626/0xeb0 [ 12.252779] queue_work_on+0xb6/0xc0 [ 12.253174] workqueue_uaf+0x26d/0x560 [ 12.253514] kunit_try_run_case+0x1a5/0x480 [ 12.253954] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.254456] kthread+0x337/0x6f0 [ 12.254835] ret_from_fork+0x116/0x1d0 [ 12.255190] ret_from_fork_asm+0x1a/0x30 [ 12.255333] [ 12.255405] The buggy address belongs to the object at ffff88810279d640 [ 12.255405] which belongs to the cache kmalloc-32 of size 32 [ 12.256386] The buggy address is located 0 bytes inside of [ 12.256386] freed 32-byte region [ffff88810279d640, ffff88810279d660) [ 12.257616] [ 12.257785] The buggy address belongs to the physical page: [ 12.258286] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10279d [ 12.259168] flags: 0x200000000000000(node=0|zone=2) [ 12.260068] page_type: f5(slab) [ 12.260261] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.260539] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.260767] page dumped because: kasan: bad access detected [ 12.260952] [ 12.261026] Memory state around the buggy address: [ 12.261184] ffff88810279d500: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 12.261404] ffff88810279d580: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 12.261618] >ffff88810279d600: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 12.261827] ^ [ 12.263382] ffff88810279d680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.264595] ffff88810279d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.265711] ==================================================================