Date
May 13, 2025, 12:07 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 19.718170] ================================================================== [ 19.718292] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 19.718429] Read of size 8 at addr fff00000c4075100 by task kunit_try_catch/200 [ 19.718500] [ 19.718604] CPU: 1 UID: 0 PID: 200 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc6-next-20250513 #1 PREEMPT [ 19.718795] Tainted: [B]=BAD_PAGE, [N]=TEST [ 19.718874] Hardware name: linux,dummy-virt (DT) [ 19.718947] Call trace: [ 19.719034] show_stack+0x20/0x38 (C) [ 19.719157] dump_stack_lvl+0x8c/0xd0 [ 19.719215] print_report+0x118/0x608 [ 19.719305] kasan_report+0xdc/0x128 [ 19.719375] __asan_report_load8_noabort+0x20/0x30 [ 19.719437] workqueue_uaf+0x480/0x4a8 [ 19.719490] kunit_try_run_case+0x170/0x3f0 [ 19.719546] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.719608] kthread+0x328/0x630 [ 19.719664] ret_from_fork+0x10/0x20 [ 19.719722] [ 19.719747] Allocated by task 200: [ 19.719799] kasan_save_stack+0x3c/0x68 [ 19.719907] kasan_save_track+0x20/0x40 [ 19.719955] kasan_save_alloc_info+0x40/0x58 [ 19.720038] __kasan_kmalloc+0xd4/0xd8 [ 19.720117] __kmalloc_cache_noprof+0x15c/0x3c0 [ 19.720166] workqueue_uaf+0x13c/0x4a8 [ 19.720208] kunit_try_run_case+0x170/0x3f0 [ 19.720256] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.720365] kthread+0x328/0x630 [ 19.720410] ret_from_fork+0x10/0x20 [ 19.720454] [ 19.720477] Freed by task 46: [ 19.720510] kasan_save_stack+0x3c/0x68 [ 19.720555] kasan_save_track+0x20/0x40 [ 19.720596] kasan_save_free_info+0x4c/0x78 [ 19.720644] __kasan_slab_free+0x6c/0x98 [ 19.720684] kfree+0x214/0x3c8 [ 19.720722] workqueue_uaf_work+0x18/0x30 [ 19.720768] process_one_work+0x530/0xf98 [ 19.720812] worker_thread+0x8ac/0xf28 [ 19.720852] kthread+0x328/0x630 [ 19.720895] ret_from_fork+0x10/0x20 [ 19.720937] [ 19.720961] Last potentially related work creation: [ 19.721005] kasan_save_stack+0x3c/0x68 [ 19.721055] kasan_record_aux_stack+0xb4/0xc8 [ 19.721101] __queue_work+0x65c/0x1010 [ 19.721172] queue_work_on+0xbc/0xf8 [ 19.721226] workqueue_uaf+0x210/0x4a8 [ 19.721292] kunit_try_run_case+0x170/0x3f0 [ 19.721624] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.721878] kthread+0x328/0x630 [ 19.722108] ret_from_fork+0x10/0x20 [ 19.722386] [ 19.722424] The buggy address belongs to the object at fff00000c4075100 [ 19.722424] which belongs to the cache kmalloc-32 of size 32 [ 19.722522] The buggy address is located 0 bytes inside of [ 19.722522] freed 32-byte region [fff00000c4075100, fff00000c4075120) [ 19.722596] [ 19.722649] The buggy address belongs to the physical page: [ 19.722846] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104075 [ 19.723054] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 19.723191] page_type: f5(slab) [ 19.723251] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 19.723312] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 19.723359] page dumped because: kasan: bad access detected [ 19.723396] [ 19.723581] Memory state around the buggy address: [ 19.723713] fff00000c4075000: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 19.723787] fff00000c4075080: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 19.723867] >fff00000c4075100: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 19.723942] ^ [ 19.723987] fff00000c4075180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.724088] fff00000c4075200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.724135] ==================================================================
[ 11.711636] ================================================================== [ 11.712123] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 11.712946] Read of size 8 at addr ffff8881026bb240 by task kunit_try_catch/217 [ 11.713686] [ 11.713826] CPU: 1 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G B N 6.15.0-rc6-next-20250513 #1 PREEMPT(voluntary) [ 11.713877] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.713888] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.713908] Call Trace: [ 11.713920] <TASK> [ 11.713937] dump_stack_lvl+0x73/0xb0 [ 11.713966] print_report+0xd1/0x650 [ 11.713988] ? __virt_addr_valid+0x1db/0x2d0 [ 11.714011] ? workqueue_uaf+0x4d6/0x560 [ 11.714032] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.714054] ? workqueue_uaf+0x4d6/0x560 [ 11.714076] kasan_report+0x141/0x180 [ 11.714098] ? workqueue_uaf+0x4d6/0x560 [ 11.714124] __asan_report_load8_noabort+0x18/0x20 [ 11.714145] workqueue_uaf+0x4d6/0x560 [ 11.714192] ? __pfx_workqueue_uaf+0x10/0x10 [ 11.714216] ? __schedule+0x10cc/0x2b60 [ 11.714238] ? __pfx_read_tsc+0x10/0x10 [ 11.714258] ? ktime_get_ts64+0x86/0x230 [ 11.714282] kunit_try_run_case+0x1a5/0x480 [ 11.714306] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.714328] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 11.714351] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.714372] ? __kthread_parkme+0x82/0x180 [ 11.714393] ? preempt_count_sub+0x50/0x80 [ 11.714418] ? __pfx_kunit_try_run_case+0x10/0x10 [ 11.714441] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.714470] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 11.714493] kthread+0x337/0x6f0 [ 11.714530] ? trace_preempt_on+0x20/0xc0 [ 11.714554] ? __pfx_kthread+0x10/0x10 [ 11.714575] ? _raw_spin_unlock_irq+0x47/0x80 [ 11.714595] ? calculate_sigpending+0x7b/0xa0 [ 11.714627] ? __pfx_kthread+0x10/0x10 [ 11.714649] ret_from_fork+0x116/0x1d0 [ 11.714667] ? __pfx_kthread+0x10/0x10 [ 11.714687] ret_from_fork_asm+0x1a/0x30 [ 11.714718] </TASK> [ 11.714730] [ 11.728587] Allocated by task 217: [ 11.728929] kasan_save_stack+0x45/0x70 [ 11.729405] kasan_save_track+0x18/0x40 [ 11.729558] kasan_save_alloc_info+0x3b/0x50 [ 11.730203] __kasan_kmalloc+0xb7/0xc0 [ 11.730591] __kmalloc_cache_noprof+0x189/0x420 [ 11.731023] workqueue_uaf+0x152/0x560 [ 11.731161] kunit_try_run_case+0x1a5/0x480 [ 11.731711] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.732204] kthread+0x337/0x6f0 [ 11.732426] ret_from_fork+0x116/0x1d0 [ 11.732574] ret_from_fork_asm+0x1a/0x30 [ 11.732932] [ 11.733113] Freed by task 44: [ 11.733403] kasan_save_stack+0x45/0x70 [ 11.733669] kasan_save_track+0x18/0x40 [ 11.733815] kasan_save_free_info+0x3f/0x60 [ 11.733958] __kasan_slab_free+0x56/0x70 [ 11.734361] kfree+0x222/0x3f0 [ 11.734501] workqueue_uaf_work+0x12/0x20 [ 11.734666] process_one_work+0x5ee/0xf60 [ 11.735080] worker_thread+0x725/0x1320 [ 11.735477] kthread+0x337/0x6f0 [ 11.735872] ret_from_fork+0x116/0x1d0 [ 11.736286] ret_from_fork_asm+0x1a/0x30 [ 11.736670] [ 11.736760] Last potentially related work creation: [ 11.737183] kasan_save_stack+0x45/0x70 [ 11.737479] kasan_record_aux_stack+0xb2/0xc0 [ 11.737634] __queue_work+0x626/0xeb0 [ 11.737762] queue_work_on+0xb6/0xc0 [ 11.737911] workqueue_uaf+0x26d/0x560 [ 11.738047] kunit_try_run_case+0x1a5/0x480 [ 11.738396] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.738971] kthread+0x337/0x6f0 [ 11.739334] ret_from_fork+0x116/0x1d0 [ 11.739515] ret_from_fork_asm+0x1a/0x30 [ 11.739796] [ 11.739867] The buggy address belongs to the object at ffff8881026bb240 [ 11.739867] which belongs to the cache kmalloc-32 of size 32 [ 11.741051] The buggy address is located 0 bytes inside of [ 11.741051] freed 32-byte region [ffff8881026bb240, ffff8881026bb260) [ 11.741962] [ 11.742038] The buggy address belongs to the physical page: [ 11.742251] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1026bb [ 11.743053] flags: 0x200000000000000(node=0|zone=2) [ 11.743518] page_type: f5(slab) [ 11.743882] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 11.744414] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 11.744651] page dumped because: kasan: bad access detected [ 11.744838] [ 11.744909] Memory state around the buggy address: [ 11.745367] ffff8881026bb100: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 11.746123] ffff8881026bb180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 11.746369] >ffff8881026bb200: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 11.747086] ^ [ 11.747635] ffff8881026bb280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.748316] ffff8881026bb300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.748978] ==================================================================