Date
July 4, 2025, 11:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.403557] ================================================================== [ 18.403684] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 18.403754] Read of size 4 at addr fff00000c5a51980 by task swapper/1/0 [ 18.403800] [ 18.403854] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 18.403938] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.403965] Hardware name: linux,dummy-virt (DT) [ 18.403998] Call trace: [ 18.404022] show_stack+0x20/0x38 (C) [ 18.404073] dump_stack_lvl+0x8c/0xd0 [ 18.404123] print_report+0x118/0x608 [ 18.404168] kasan_report+0xdc/0x128 [ 18.404213] __asan_report_load4_noabort+0x20/0x30 [ 18.404601] rcu_uaf_reclaim+0x64/0x70 [ 18.404689] rcu_core+0x9f4/0x1e20 [ 18.404745] rcu_core_si+0x18/0x30 [ 18.404800] handle_softirqs+0x374/0xb28 [ 18.404863] __do_softirq+0x1c/0x28 [ 18.404915] ____do_softirq+0x18/0x30 [ 18.404959] call_on_irq_stack+0x24/0x30 [ 18.405004] do_softirq_own_stack+0x24/0x38 [ 18.405048] __irq_exit_rcu+0x1fc/0x318 [ 18.405113] irq_exit_rcu+0x1c/0x80 [ 18.405157] el1_interrupt+0x38/0x58 [ 18.405203] el1h_64_irq_handler+0x18/0x28 [ 18.405250] el1h_64_irq+0x6c/0x70 [ 18.405414] arch_local_irq_enable+0x4/0x8 (P) [ 18.405476] do_idle+0x384/0x4e8 [ 18.405534] cpu_startup_entry+0x64/0x80 [ 18.405581] secondary_start_kernel+0x288/0x340 [ 18.405628] __secondary_switched+0xc0/0xc8 [ 18.405801] [ 18.406115] Allocated by task 198: [ 18.406223] kasan_save_stack+0x3c/0x68 [ 18.406288] kasan_save_track+0x20/0x40 [ 18.406342] kasan_save_alloc_info+0x40/0x58 [ 18.406406] __kasan_kmalloc+0xd4/0xd8 [ 18.406443] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.406490] rcu_uaf+0xb0/0x2d8 [ 18.406776] kunit_try_run_case+0x170/0x3f0 [ 18.406846] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.406950] kthread+0x328/0x630 [ 18.407031] ret_from_fork+0x10/0x20 [ 18.407100] [ 18.407153] Freed by task 0: [ 18.407211] kasan_save_stack+0x3c/0x68 [ 18.407291] kasan_save_track+0x20/0x40 [ 18.407359] kasan_save_free_info+0x4c/0x78 [ 18.407424] __kasan_slab_free+0x6c/0x98 [ 18.407516] kfree+0x214/0x3c8 [ 18.407563] rcu_uaf_reclaim+0x28/0x70 [ 18.407598] rcu_core+0x9f4/0x1e20 [ 18.407654] rcu_core_si+0x18/0x30 [ 18.407688] handle_softirqs+0x374/0xb28 [ 18.407724] __do_softirq+0x1c/0x28 [ 18.407933] [ 18.408026] Last potentially related work creation: [ 18.409433] kasan_save_stack+0x3c/0x68 [ 18.409695] kasan_record_aux_stack+0xb4/0xc8 [ 18.409746] __call_rcu_common.constprop.0+0x74/0x8c8 [ 18.409812] call_rcu+0x18/0x30 [ 18.409848] rcu_uaf+0x14c/0x2d8 [ 18.409884] kunit_try_run_case+0x170/0x3f0 [ 18.409924] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.409987] kthread+0x328/0x630 [ 18.410036] ret_from_fork+0x10/0x20 [ 18.410089] [ 18.410130] The buggy address belongs to the object at fff00000c5a51980 [ 18.410130] which belongs to the cache kmalloc-32 of size 32 [ 18.410198] The buggy address is located 0 bytes inside of [ 18.410198] freed 32-byte region [fff00000c5a51980, fff00000c5a519a0) [ 18.410258] [ 18.410285] The buggy address belongs to the physical page: [ 18.410334] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a51 [ 18.410388] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.410452] page_type: f5(slab) [ 18.410502] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.410572] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.410611] page dumped because: kasan: bad access detected [ 18.410642] [ 18.410659] Memory state around the buggy address: [ 18.410700] fff00000c5a51880: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 18.410765] fff00000c5a51900: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 18.410818] >fff00000c5a51980: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 18.410855] ^ [ 18.410902] fff00000c5a51a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.410951] fff00000c5a51a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.411013] ==================================================================
[ 12.536379] ================================================================== [ 12.536998] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 12.537612] Read of size 4 at addr ffff888103983140 by task swapper/1/0 [ 12.538005] [ 12.538342] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 12.538396] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.538408] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.538431] Call Trace: [ 12.538534] <IRQ> [ 12.538606] dump_stack_lvl+0x73/0xb0 [ 12.538649] print_report+0xd1/0x650 [ 12.538673] ? __virt_addr_valid+0x1db/0x2d0 [ 12.538695] ? rcu_uaf_reclaim+0x50/0x60 [ 12.538716] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.538737] ? rcu_uaf_reclaim+0x50/0x60 [ 12.538756] kasan_report+0x141/0x180 [ 12.538777] ? rcu_uaf_reclaim+0x50/0x60 [ 12.538801] __asan_report_load4_noabort+0x18/0x20 [ 12.538870] rcu_uaf_reclaim+0x50/0x60 [ 12.538890] rcu_core+0x66f/0x1c40 [ 12.538966] ? __pfx_rcu_core+0x10/0x10 [ 12.538988] ? ktime_get+0x6b/0x150 [ 12.539023] rcu_core_si+0x12/0x20 [ 12.539042] handle_softirqs+0x209/0x730 [ 12.539062] ? hrtimer_interrupt+0x2fe/0x780 [ 12.539083] ? __pfx_handle_softirqs+0x10/0x10 [ 12.539106] __irq_exit_rcu+0xc9/0x110 [ 12.539125] irq_exit_rcu+0x12/0x20 [ 12.539143] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.539167] </IRQ> [ 12.539210] <TASK> [ 12.539233] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.539329] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 12.539546] Code: 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 03 9a 21 00 fb f4 <e9> 7c 1d 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 12.539643] RSP: 0000:ffff888100877dc8 EFLAGS: 00010202 [ 12.539734] RAX: ffff8881a6174000 RBX: ffff888100853000 RCX: ffffffffb2a720e5 [ 12.539778] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 0000000000010644 [ 12.539819] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a [ 12.539860] R10: ffff88815b130c53 R11: 000000000002e000 R12: 0000000000000001 [ 12.539901] R13: ffffed102010a600 R14: ffffffffb47b0e90 R15: 0000000000000000 [ 12.539956] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 12.540007] ? default_idle+0xd/0x20 [ 12.540028] arch_cpu_idle+0xd/0x20 [ 12.540048] default_idle_call+0x48/0x80 [ 12.540065] do_idle+0x379/0x4f0 [ 12.540087] ? complete+0x15b/0x1d0 [ 12.540104] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 12.540128] ? __pfx_do_idle+0x10/0x10 [ 12.540148] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 12.540169] ? complete+0x15b/0x1d0 [ 12.540188] cpu_startup_entry+0x5c/0x70 [ 12.540211] start_secondary+0x211/0x290 [ 12.540245] ? __pfx_start_secondary+0x10/0x10 [ 12.540268] common_startup_64+0x13e/0x148 [ 12.540298] </TASK> [ 12.540310] [ 12.560832] Allocated by task 215: [ 12.561383] kasan_save_stack+0x45/0x70 [ 12.561559] kasan_save_track+0x18/0x40 [ 12.561696] kasan_save_alloc_info+0x3b/0x50 [ 12.561844] __kasan_kmalloc+0xb7/0xc0 [ 12.561976] __kmalloc_cache_noprof+0x189/0x420 [ 12.562134] rcu_uaf+0xb0/0x330 [ 12.562274] kunit_try_run_case+0x1a5/0x480 [ 12.562421] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.562593] kthread+0x337/0x6f0 [ 12.562714] ret_from_fork+0x116/0x1d0 [ 12.562846] ret_from_fork_asm+0x1a/0x30 [ 12.562986] [ 12.563060] Freed by task 0: [ 12.563169] kasan_save_stack+0x45/0x70 [ 12.565853] kasan_save_track+0x18/0x40 [ 12.566954] kasan_save_free_info+0x3f/0x60 [ 12.567788] __kasan_slab_free+0x56/0x70 [ 12.568664] kfree+0x222/0x3f0 [ 12.568864] rcu_uaf_reclaim+0x1f/0x60 [ 12.569063] rcu_core+0x66f/0x1c40 [ 12.569660] rcu_core_si+0x12/0x20 [ 12.569844] handle_softirqs+0x209/0x730 [ 12.570115] __irq_exit_rcu+0xc9/0x110 [ 12.571363] irq_exit_rcu+0x12/0x20 [ 12.571551] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.571721] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.571891] [ 12.572015] Last potentially related work creation: [ 12.572626] kasan_save_stack+0x45/0x70 [ 12.573019] kasan_record_aux_stack+0xb2/0xc0 [ 12.573482] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 12.573656] call_rcu+0x12/0x20 [ 12.573773] rcu_uaf+0x168/0x330 [ 12.573895] kunit_try_run_case+0x1a5/0x480 [ 12.574041] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.574213] kthread+0x337/0x6f0 [ 12.574650] ret_from_fork+0x116/0x1d0 [ 12.575000] ret_from_fork_asm+0x1a/0x30 [ 12.575503] [ 12.575746] The buggy address belongs to the object at ffff888103983140 [ 12.575746] which belongs to the cache kmalloc-32 of size 32 [ 12.577348] The buggy address is located 0 bytes inside of [ 12.577348] freed 32-byte region [ffff888103983140, ffff888103983160) [ 12.578637] [ 12.578837] The buggy address belongs to the physical page: [ 12.579408] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103983 [ 12.579768] flags: 0x200000000000000(node=0|zone=2) [ 12.580603] page_type: f5(slab) [ 12.580912] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.581147] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.581794] page dumped because: kasan: bad access detected [ 12.582318] [ 12.582506] Memory state around the buggy address: [ 12.583049] ffff888103983000: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 12.583744] ffff888103983080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 12.584030] >ffff888103983100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 12.584626] ^ [ 12.585101] ffff888103983180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.585713] ffff888103983200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.586520] ==================================================================