Date
May 26, 2025, 9:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.081312] ================================================================== [ 18.081491] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 18.081631] Read of size 8 at addr fff00000c78b61c0 by task kunit_try_catch/200 [ 18.081773] [ 18.081859] CPU: 0 UID: 0 PID: 200 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc7-next-20250526 #1 PREEMPT [ 18.082072] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.082167] Hardware name: linux,dummy-virt (DT) [ 18.082263] Call trace: [ 18.082368] show_stack+0x20/0x38 (C) [ 18.082549] dump_stack_lvl+0x8c/0xd0 [ 18.082700] print_report+0x118/0x608 [ 18.082891] kasan_report+0xdc/0x128 [ 18.082998] __asan_report_load8_noabort+0x20/0x30 [ 18.083122] workqueue_uaf+0x480/0x4a8 [ 18.083255] kunit_try_run_case+0x170/0x3f0 [ 18.083385] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.083523] kthread+0x328/0x630 [ 18.083622] ret_from_fork+0x10/0x20 [ 18.083747] [ 18.083772] Allocated by task 200: [ 18.083811] kasan_save_stack+0x3c/0x68 [ 18.083862] kasan_save_track+0x20/0x40 [ 18.083903] kasan_save_alloc_info+0x40/0x58 [ 18.083947] __kasan_kmalloc+0xd4/0xd8 [ 18.083987] __kmalloc_cache_noprof+0x15c/0x3c0 [ 18.084032] workqueue_uaf+0x13c/0x4a8 [ 18.084072] kunit_try_run_case+0x170/0x3f0 [ 18.084113] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.084160] kthread+0x328/0x630 [ 18.084196] ret_from_fork+0x10/0x20 [ 18.084235] [ 18.084257] Freed by task 10: [ 18.084285] kasan_save_stack+0x3c/0x68 [ 18.084353] kasan_save_track+0x20/0x40 [ 18.084433] kasan_save_free_info+0x4c/0x78 [ 18.084586] __kasan_slab_free+0x6c/0x98 [ 18.084758] kfree+0x214/0x3c8 [ 18.084862] workqueue_uaf_work+0x18/0x30 [ 18.084956] process_one_work+0x530/0xf98 [ 18.085277] worker_thread+0x8ac/0xf28 [ 18.085617] kthread+0x328/0x630 [ 18.085685] ret_from_fork+0x10/0x20 [ 18.085770] [ 18.085816] Last potentially related work creation: [ 18.085880] kasan_save_stack+0x3c/0x68 [ 18.085973] kasan_record_aux_stack+0xb4/0xc8 [ 18.086066] __queue_work+0x65c/0x1010 [ 18.086577] queue_work_on+0xbc/0xf8 [ 18.086742] workqueue_uaf+0x210/0x4a8 [ 18.087296] kunit_try_run_case+0x170/0x3f0 [ 18.087431] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.087544] kthread+0x328/0x630 [ 18.088136] ret_from_fork+0x10/0x20 [ 18.088369] [ 18.088519] The buggy address belongs to the object at fff00000c78b61c0 [ 18.088519] which belongs to the cache kmalloc-32 of size 32 [ 18.088688] The buggy address is located 0 bytes inside of [ 18.088688] freed 32-byte region [fff00000c78b61c0, fff00000c78b61e0) [ 18.088899] [ 18.088963] The buggy address belongs to the physical page: [ 18.089333] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1078b6 [ 18.089673] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.089835] page_type: f5(slab) [ 18.089929] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.090045] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.090554] page dumped because: kasan: bad access detected [ 18.090651] [ 18.090695] Memory state around the buggy address: [ 18.090772] fff00000c78b6080: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 18.090869] fff00000c78b6100: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.090968] >fff00000c78b6180: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 18.091058] ^ [ 18.091219] fff00000c78b6200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.091568] fff00000c78b6280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.091722] ==================================================================
[ 11.581937] ================================================================== [ 11.582977] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 11.583643] Read of size 8 at addr ffff888102824d40 by task kunit_try_catch/218 [ 11.584104] [ 11.584225] CPU: 0 UID: 0 PID: 218 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc7-next-20250526 #1 PREEMPT(voluntary) [ 11.584271] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.584283] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.584304] Call Trace: [ 11.584316] <TASK> [ 11.584333] dump_stack_lvl+0x73/0xb0 [ 11.584362] print_report+0xd1/0x650 [ 11.584398] ? __virt_addr_valid+0x1db/0x2d0 [ 11.584420] ? workqueue_uaf+0x4d6/0x560 [ 11.584441] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.584463] ? workqueue_uaf+0x4d6/0x560 [ 11.584484] kasan_report+0x141/0x180 [ 11.584807] ? workqueue_uaf+0x4d6/0x560 [ 11.584836] __asan_report_load8_noabort+0x18/0x20 [ 11.584857] workqueue_uaf+0x4d6/0x560 [ 11.584879] ? __pfx_workqueue_uaf+0x10/0x10 [ 11.584901] ? __schedule+0x10cc/0x2b60 [ 11.584926] ? __pfx_read_tsc+0x10/0x10 [ 11.584946] ? ktime_get_ts64+0x86/0x230 [ 11.584971] kunit_try_run_case+0x1a5/0x480 [ 11.584992] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.585083] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.585108] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.585133] ? __kthread_parkme+0x82/0x180 [ 11.585153] ? preempt_count_sub+0x50/0x80 [ 11.585176] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.585196] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.585220] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.585243] kthread+0x337/0x6f0 [ 11.585262] ? trace_preempt_on+0x20/0xc0 [ 11.585285] ? __pfx_kthread+0x10/0x10 [ 11.585305] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.585327] ? calculate_sigpending+0x7b/0xa0 [ 11.585352] ? __pfx_kthread+0x10/0x10 [ 11.585373] ret_from_fork+0x116/0x1d0 [ 11.585403] ? __pfx_kthread+0x10/0x10 [ 11.585423] ret_from_fork_asm+0x1a/0x30 [ 11.585453] </TASK> [ 11.585464] [ 11.595878] Allocated by task 218: [ 11.596431] kasan_save_stack+0x45/0x70 [ 11.596623] kasan_save_track+0x18/0x40 [ 11.596854] kasan_save_alloc_info+0x3b/0x50 [ 11.597427] __kasan_kmalloc+0xb7/0xc0 [ 11.597749] __kmalloc_cache_noprof+0x189/0x420 [ 11.597986] workqueue_uaf+0x152/0x560 [ 11.598438] kunit_try_run_case+0x1a5/0x480 [ 11.598627] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.599095] kthread+0x337/0x6f0 [ 11.599365] ret_from_fork+0x116/0x1d0 [ 11.599677] ret_from_fork_asm+0x1a/0x30 [ 11.600051] [ 11.600238] Freed by task 9: [ 11.600364] kasan_save_stack+0x45/0x70 [ 11.600584] kasan_save_track+0x18/0x40 [ 11.601267] kasan_save_free_info+0x3f/0x60 [ 11.601488] __kasan_slab_free+0x56/0x70 [ 11.601805] kfree+0x222/0x3f0 [ 11.602114] workqueue_uaf_work+0x12/0x20 [ 11.602303] process_one_work+0x5ee/0xf60 [ 11.602677] worker_thread+0x758/0x1220 [ 11.603041] kthread+0x337/0x6f0 [ 11.603286] ret_from_fork+0x116/0x1d0 [ 11.603601] ret_from_fork_asm+0x1a/0x30 [ 11.604012] [ 11.604138] Last potentially related work creation: [ 11.604368] kasan_save_stack+0x45/0x70 [ 11.604657] kasan_record_aux_stack+0xb2/0xc0 [ 11.605246] __queue_work+0x626/0xeb0 [ 11.605466] queue_work_on+0xb6/0xc0 [ 11.605646] workqueue_uaf+0x26d/0x560 [ 11.605935] kunit_try_run_case+0x1a5/0x480 [ 11.606194] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.606623] kthread+0x337/0x6f0 [ 11.606804] ret_from_fork+0x116/0x1d0 [ 11.607216] ret_from_fork_asm+0x1a/0x30 [ 11.607437] [ 11.607522] The buggy address belongs to the object at ffff888102824d40 [ 11.607522] which belongs to the cache kmalloc-32 of size 32 [ 11.608406] The buggy address is located 0 bytes inside of [ 11.608406] freed 32-byte region [ffff888102824d40, ffff888102824d60) [ 11.608983] [ 11.609071] The buggy address belongs to the physical page: [ 11.609536] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102824 [ 11.609947] flags: 0x200000000000000(node=0|zone=2) [ 11.610234] page_type: f5(slab) [ 11.610392] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 11.610729] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 11.611019] page dumped because: kasan: bad access detected [ 11.611271] [ 11.611421] Memory state around the buggy address: [ 11.611612] ffff888102824c00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 11.612057] ffff888102824c80: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc [ 11.612533] >ffff888102824d00: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 11.613286] ^ [ 11.613561] ffff888102824d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.614126] ffff888102824e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.614517] ==================================================================