Date
July 25, 2025, 3:13 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 32.541122] ================================================================== [ 32.541513] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x3f4/0x468 [ 32.541710] Read of size 1 at addr fff00000c9b220a8 by task kunit_try_catch/220 [ 32.541769] [ 32.541922] CPU: 1 UID: 0 PID: 220 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250725 #1 PREEMPT [ 32.542192] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 32.542237] Hardware name: linux,dummy-virt (DT) [ 32.542306] Call trace: [ 32.542500] show_stack+0x20/0x38 (C) [ 32.542663] dump_stack_lvl+0x8c/0xd0 [ 32.542725] print_report+0x118/0x5e8 [ 32.542997] kasan_report+0xdc/0x128 [ 32.543162] __asan_report_load1_noabort+0x20/0x30 [ 32.543218] kmalloc_uaf2+0x3f4/0x468 [ 32.543539] kunit_try_run_case+0x170/0x3f0 [ 32.543744] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.543948] kthread+0x328/0x630 [ 32.544044] ret_from_fork+0x10/0x20 [ 32.544180] [ 32.544200] Allocated by task 220: [ 32.544248] kasan_save_stack+0x3c/0x68 [ 32.544333] kasan_save_track+0x20/0x40 [ 32.544573] kasan_save_alloc_info+0x40/0x58 [ 32.544763] __kasan_kmalloc+0xd4/0xd8 [ 32.544905] __kmalloc_cache_noprof+0x16c/0x3c0 [ 32.545049] kmalloc_uaf2+0xc4/0x468 [ 32.545091] kunit_try_run_case+0x170/0x3f0 [ 32.545431] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.545588] kthread+0x328/0x630 [ 32.545726] ret_from_fork+0x10/0x20 [ 32.545834] [ 32.545963] Freed by task 220: [ 32.546101] kasan_save_stack+0x3c/0x68 [ 32.546452] kasan_save_track+0x20/0x40 [ 32.546552] kasan_save_free_info+0x4c/0x78 [ 32.546727] __kasan_slab_free+0x7c/0xa8 [ 32.546805] kfree+0x214/0x3c8 [ 32.546859] kmalloc_uaf2+0x134/0x468 [ 32.547253] kunit_try_run_case+0x170/0x3f0 [ 32.547406] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.547556] kthread+0x328/0x630 [ 32.547761] ret_from_fork+0x10/0x20 [ 32.547806] [ 32.547826] The buggy address belongs to the object at fff00000c9b22080 [ 32.547826] which belongs to the cache kmalloc-64 of size 64 [ 32.548042] The buggy address is located 40 bytes inside of [ 32.548042] freed 64-byte region [fff00000c9b22080, fff00000c9b220c0) [ 32.548304] [ 32.548398] The buggy address belongs to the physical page: [ 32.548518] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b22 [ 32.548677] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 32.548743] page_type: f5(slab) [ 32.549094] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000 [ 32.549310] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 32.549404] page dumped because: kasan: bad access detected [ 32.549586] [ 32.549632] Memory state around the buggy address: [ 32.549951] fff00000c9b21f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 32.550114] fff00000c9b22000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 32.550549] >fff00000c9b22080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 32.550877] ^ [ 32.551546] fff00000c9b22100: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 32.552130] fff00000c9b22180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.552201] ==================================================================
[ 26.083156] ================================================================== [ 26.083596] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520 [ 26.084337] Read of size 1 at addr ffff888106254228 by task kunit_try_catch/237 [ 26.084734] [ 26.084826] CPU: 1 UID: 0 PID: 237 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) [ 26.084878] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.084926] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 26.084960] Call Trace: [ 26.085045] <TASK> [ 26.085105] dump_stack_lvl+0x73/0xb0 [ 26.085151] print_report+0xd1/0x640 [ 26.085175] ? __virt_addr_valid+0x1db/0x2d0 [ 26.085200] ? kmalloc_uaf2+0x4a8/0x520 [ 26.085221] ? kasan_complete_mode_report_info+0x64/0x200 [ 26.085247] ? kmalloc_uaf2+0x4a8/0x520 [ 26.085302] kasan_report+0x141/0x180 [ 26.085326] ? kmalloc_uaf2+0x4a8/0x520 [ 26.085351] __asan_report_load1_noabort+0x18/0x20 [ 26.085376] kmalloc_uaf2+0x4a8/0x520 [ 26.085397] ? __pfx_kmalloc_uaf2+0x10/0x10 [ 26.085417] ? finish_task_switch.isra.0+0x153/0x700 [ 26.085440] ? __switch_to+0x47/0xf80 [ 26.085468] ? __schedule+0x10da/0x2b60 [ 26.085490] ? __pfx_read_tsc+0x10/0x10 [ 26.085513] ? ktime_get_ts64+0x86/0x230 [ 26.085539] kunit_try_run_case+0x1a5/0x480 [ 26.085564] ? __pfx_kunit_try_run_case+0x10/0x10 [ 26.085587] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 26.085610] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 26.085636] ? __kthread_parkme+0x82/0x180 [ 26.085656] ? preempt_count_sub+0x50/0x80 [ 26.085680] ? __pfx_kunit_try_run_case+0x10/0x10 [ 26.085704] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.085728] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 26.085752] kthread+0x337/0x6f0 [ 26.085772] ? trace_preempt_on+0x20/0xc0 [ 26.085844] ? __pfx_kthread+0x10/0x10 [ 26.085866] ? _raw_spin_unlock_irq+0x47/0x80 [ 26.085890] ? calculate_sigpending+0x7b/0xa0 [ 26.085915] ? __pfx_kthread+0x10/0x10 [ 26.085937] ret_from_fork+0x116/0x1d0 [ 26.085970] ? __pfx_kthread+0x10/0x10 [ 26.085991] ret_from_fork_asm+0x1a/0x30 [ 26.086022] </TASK> [ 26.086034] [ 26.094642] Allocated by task 237: [ 26.094837] kasan_save_stack+0x45/0x70 [ 26.095110] kasan_save_track+0x18/0x40 [ 26.095308] kasan_save_alloc_info+0x3b/0x50 [ 26.095549] __kasan_kmalloc+0xb7/0xc0 [ 26.095741] __kmalloc_cache_noprof+0x189/0x420 [ 26.096133] kmalloc_uaf2+0xc6/0x520 [ 26.096393] kunit_try_run_case+0x1a5/0x480 [ 26.096642] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.096996] kthread+0x337/0x6f0 [ 26.097297] ret_from_fork+0x116/0x1d0 [ 26.097523] ret_from_fork_asm+0x1a/0x30 [ 26.097722] [ 26.097809] Freed by task 237: [ 26.097962] kasan_save_stack+0x45/0x70 [ 26.098272] kasan_save_track+0x18/0x40 [ 26.098507] kasan_save_free_info+0x3f/0x60 [ 26.098738] __kasan_slab_free+0x5e/0x80 [ 26.099015] kfree+0x222/0x3f0 [ 26.099233] kmalloc_uaf2+0x14c/0x520 [ 26.099457] kunit_try_run_case+0x1a5/0x480 [ 26.099704] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.100040] kthread+0x337/0x6f0 [ 26.100379] ret_from_fork+0x116/0x1d0 [ 26.100545] ret_from_fork_asm+0x1a/0x30 [ 26.100740] [ 26.101117] The buggy address belongs to the object at ffff888106254200 [ 26.101117] which belongs to the cache kmalloc-64 of size 64 [ 26.101912] The buggy address is located 40 bytes inside of [ 26.101912] freed 64-byte region [ffff888106254200, ffff888106254240) [ 26.102450] [ 26.102541] The buggy address belongs to the physical page: [ 26.102797] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106254 [ 26.103362] flags: 0x200000000000000(node=0|zone=2) [ 26.103540] page_type: f5(slab) [ 26.103702] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 [ 26.104709] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 [ 26.105302] page dumped because: kasan: bad access detected [ 26.105575] [ 26.105667] Memory state around the buggy address: [ 26.106002] ffff888106254100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.106363] ffff888106254180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.106710] >ffff888106254200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.107176] ^ [ 26.107430] ffff888106254280: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc [ 26.107730] ffff888106254300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.108093] ==================================================================