Date
July 23, 2025, 2:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.960989] ================================================================== [ 15.961068] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 15.961128] Read of size 8 at addr fff00000c3f937c0 by task kunit_try_catch/200 [ 15.961180] [ 15.961216] CPU: 1 UID: 0 PID: 200 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7 #1 PREEMPT [ 15.963027] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.963073] Hardware name: linux,dummy-virt (DT) [ 15.963156] Call trace: [ 15.963183] show_stack+0x20/0x38 (C) [ 15.963240] dump_stack_lvl+0x8c/0xd0 [ 15.963287] print_report+0x118/0x5d0 [ 15.963333] kasan_report+0xdc/0x128 [ 15.963378] __asan_report_load8_noabort+0x20/0x30 [ 15.963431] workqueue_uaf+0x480/0x4a8 [ 15.963474] kunit_try_run_case+0x170/0x3f0 [ 15.963521] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.963574] kthread+0x328/0x630 [ 15.963616] ret_from_fork+0x10/0x20 [ 15.963712] [ 15.963810] Allocated by task 200: [ 15.963842] kasan_save_stack+0x3c/0x68 [ 15.964702] kasan_save_track+0x20/0x40 [ 15.965108] kasan_save_alloc_info+0x40/0x58 [ 15.965202] __kasan_kmalloc+0xd4/0xd8 [ 15.965240] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.965282] workqueue_uaf+0x13c/0x4a8 [ 15.966159] kunit_try_run_case+0x170/0x3f0 [ 15.966217] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.966263] kthread+0x328/0x630 [ 15.966691] ret_from_fork+0x10/0x20 [ 15.966883] [ 15.966906] Freed by task 57: [ 15.967086] kasan_save_stack+0x3c/0x68 [ 15.967297] kasan_save_track+0x20/0x40 [ 15.967376] kasan_save_free_info+0x4c/0x78 [ 15.967417] __kasan_slab_free+0x6c/0x98 [ 15.967876] kfree+0x214/0x3c8 [ 15.967923] workqueue_uaf_work+0x18/0x30 [ 15.968293] process_one_work+0x530/0xf98 [ 15.968345] worker_thread+0x618/0xf38 [ 15.968729] kthread+0x328/0x630 [ 15.968774] ret_from_fork+0x10/0x20 [ 15.969117] [ 15.969146] Last potentially related work creation: [ 15.969208] kasan_save_stack+0x3c/0x68 [ 15.969597] kasan_record_aux_stack+0xb4/0xc8 [ 15.969964] __queue_work+0x65c/0x1008 [ 15.970297] queue_work_on+0xbc/0xf8 [ 15.970776] workqueue_uaf+0x210/0x4a8 [ 15.970826] kunit_try_run_case+0x170/0x3f0 [ 15.971102] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.971150] kthread+0x328/0x630 [ 15.971358] ret_from_fork+0x10/0x20 [ 15.971416] [ 15.971650] The buggy address belongs to the object at fff00000c3f937c0 [ 15.971650] which belongs to the cache kmalloc-32 of size 32 [ 15.971972] The buggy address is located 0 bytes inside of [ 15.971972] freed 32-byte region [fff00000c3f937c0, fff00000c3f937e0) [ 15.972575] [ 15.972719] The buggy address belongs to the physical page: [ 15.973028] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103f93 [ 15.973306] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.973671] page_type: f5(slab) [ 15.973779] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 15.974014] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 15.974060] page dumped because: kasan: bad access detected [ 15.974094] [ 15.974112] Memory state around the buggy address: [ 15.974287] fff00000c3f93680: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 15.974412] fff00000c3f93700: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 15.974604] >fff00000c3f93780: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 15.974699] ^ [ 15.974934] fff00000c3f93800: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.975186] fff00000c3f93880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.975513] ==================================================================
[ 13.192028] ================================================================== [ 13.192538] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 13.192768] Read of size 8 at addr ffff888102b05b80 by task kunit_try_catch/217 [ 13.194403] [ 13.194894] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7 #1 PREEMPT(voluntary) [ 13.194947] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.194960] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.194981] Call Trace: [ 13.194995] <TASK> [ 13.195011] dump_stack_lvl+0x73/0xb0 [ 13.195045] print_report+0xd1/0x610 [ 13.195068] ? __virt_addr_valid+0x1db/0x2d0 [ 13.195090] ? workqueue_uaf+0x4d6/0x560 [ 13.195112] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.195135] ? workqueue_uaf+0x4d6/0x560 [ 13.195157] kasan_report+0x141/0x180 [ 13.195180] ? workqueue_uaf+0x4d6/0x560 [ 13.195206] __asan_report_load8_noabort+0x18/0x20 [ 13.195231] workqueue_uaf+0x4d6/0x560 [ 13.195253] ? __pfx_workqueue_uaf+0x10/0x10 [ 13.195276] ? __schedule+0x10c6/0x2b60 [ 13.195299] ? __pfx_read_tsc+0x10/0x10 [ 13.195321] ? ktime_get_ts64+0x86/0x230 [ 13.195347] kunit_try_run_case+0x1a5/0x480 [ 13.195373] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.195397] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.195422] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.195446] ? __kthread_parkme+0x82/0x180 [ 13.195468] ? preempt_count_sub+0x50/0x80 [ 13.195492] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.195516] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.195540] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.195565] kthread+0x337/0x6f0 [ 13.195585] ? trace_preempt_on+0x20/0xc0 [ 13.195608] ? __pfx_kthread+0x10/0x10 [ 13.195629] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.195651] ? calculate_sigpending+0x7b/0xa0 [ 13.195675] ? __pfx_kthread+0x10/0x10 [ 13.195697] ret_from_fork+0x116/0x1d0 [ 13.195716] ? __pfx_kthread+0x10/0x10 [ 13.195737] ret_from_fork_asm+0x1a/0x30 [ 13.195768] </TASK> [ 13.195779] [ 13.209059] Allocated by task 217: [ 13.209414] kasan_save_stack+0x45/0x70 [ 13.209898] kasan_save_track+0x18/0x40 [ 13.210409] kasan_save_alloc_info+0x3b/0x50 [ 13.210632] __kasan_kmalloc+0xb7/0xc0 [ 13.211008] __kmalloc_cache_noprof+0x189/0x420 [ 13.211231] workqueue_uaf+0x152/0x560 [ 13.211682] kunit_try_run_case+0x1a5/0x480 [ 13.212143] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.212650] kthread+0x337/0x6f0 [ 13.212976] ret_from_fork+0x116/0x1d0 [ 13.213145] ret_from_fork_asm+0x1a/0x30 [ 13.213623] [ 13.213826] Freed by task 9: [ 13.214114] kasan_save_stack+0x45/0x70 [ 13.214414] kasan_save_track+0x18/0x40 [ 13.214681] kasan_save_free_info+0x3f/0x60 [ 13.214841] __kasan_slab_free+0x56/0x70 [ 13.214978] kfree+0x222/0x3f0 [ 13.215104] workqueue_uaf_work+0x12/0x20 [ 13.215497] process_one_work+0x5ee/0xf60 [ 13.215936] worker_thread+0x758/0x1220 [ 13.216399] kthread+0x337/0x6f0 [ 13.216771] ret_from_fork+0x116/0x1d0 [ 13.217179] ret_from_fork_asm+0x1a/0x30 [ 13.217796] [ 13.218007] Last potentially related work creation: [ 13.218491] kasan_save_stack+0x45/0x70 [ 13.218633] kasan_record_aux_stack+0xb2/0xc0 [ 13.218781] __queue_work+0x626/0xeb0 [ 13.218928] queue_work_on+0xb6/0xc0 [ 13.219058] workqueue_uaf+0x26d/0x560 [ 13.219429] kunit_try_run_case+0x1a5/0x480 [ 13.219879] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.220491] kthread+0x337/0x6f0 [ 13.220918] ret_from_fork+0x116/0x1d0 [ 13.221353] ret_from_fork_asm+0x1a/0x30 [ 13.221794] [ 13.222071] The buggy address belongs to the object at ffff888102b05b80 [ 13.222071] which belongs to the cache kmalloc-32 of size 32 [ 13.223695] The buggy address is located 0 bytes inside of [ 13.223695] freed 32-byte region [ffff888102b05b80, ffff888102b05ba0) [ 13.224070] [ 13.224242] The buggy address belongs to the physical page: [ 13.224838] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b05 [ 13.225600] flags: 0x200000000000000(node=0|zone=2) [ 13.226068] page_type: f5(slab) [ 13.226437] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 13.226958] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 13.227437] page dumped because: kasan: bad access detected [ 13.228069] [ 13.228238] Memory state around the buggy address: [ 13.228781] ffff888102b05a80: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 13.229263] ffff888102b05b00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 13.229856] >ffff888102b05b80: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 13.230077] ^ [ 13.230198] ffff888102b05c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.230417] ffff888102b05c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.230633] ==================================================================