Date
July 6, 2025, 11:09 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.530602] ================================================================== [ 18.530779] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 18.530852] Read of size 4 at addr fff00000c56eb440 by task swapper/1/0 [ 18.530908] [ 18.530959] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc4 #1 PREEMPT [ 18.531040] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.531068] Hardware name: linux,dummy-virt (DT) [ 18.531099] Call trace: [ 18.531122] show_stack+0x20/0x38 (C) [ 18.531172] dump_stack_lvl+0x8c/0xd0 [ 18.531252] print_report+0x118/0x608 [ 18.531303] kasan_report+0xdc/0x128 [ 18.531358] __asan_report_load4_noabort+0x20/0x30 [ 18.531407] rcu_uaf_reclaim+0x64/0x70 [ 18.531459] rcu_core+0x9f4/0x1e20 [ 18.531514] rcu_core_si+0x18/0x30 [ 18.531557] handle_softirqs+0x374/0xb28 [ 18.531603] __do_softirq+0x1c/0x28 [ 18.531645] ____do_softirq+0x18/0x30 [ 18.531688] call_on_irq_stack+0x24/0x30 [ 18.531733] do_softirq_own_stack+0x24/0x38 [ 18.531778] __irq_exit_rcu+0x1fc/0x318 [ 18.531822] irq_exit_rcu+0x1c/0x80 [ 18.531872] el1_interrupt+0x38/0x58 [ 18.531926] el1h_64_irq_handler+0x18/0x28 [ 18.531973] el1h_64_irq+0x6c/0x70 [ 18.532076] arch_local_irq_enable+0x4/0x8 (P) [ 18.532126] do_idle+0x384/0x4e8 [ 18.532170] cpu_startup_entry+0x64/0x80 [ 18.532570] secondary_start_kernel+0x288/0x340 [ 18.532868] __secondary_switched+0xc0/0xc8 [ 18.532950] [ 18.532998] Allocated by task 198: [ 18.533045] kasan_save_stack+0x3c/0x68 [ 18.533089] kasan_save_track+0x20/0x40 [ 18.533126] kasan_save_alloc_info+0x40/0x58 [ 18.533179] __kasan_kmalloc+0xd4/0xd8 [ 18.533255] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.533321] rcu_uaf+0xb0/0x2d8 [ 18.533366] kunit_try_run_case+0x170/0x3f0 [ 18.533406] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.533476] kthread+0x328/0x630 [ 18.533509] ret_from_fork+0x10/0x20 [ 18.533545] [ 18.533565] Freed by task 0: [ 18.533592] kasan_save_stack+0x3c/0x68 [ 18.533735] kasan_save_track+0x20/0x40 [ 18.533873] kasan_save_free_info+0x4c/0x78 [ 18.533969] __kasan_slab_free+0x6c/0x98 [ 18.534066] kfree+0x214/0x3c8 [ 18.534230] rcu_uaf_reclaim+0x28/0x70 [ 18.534399] rcu_core+0x9f4/0x1e20 [ 18.534539] rcu_core_si+0x18/0x30 [ 18.534705] handle_softirqs+0x374/0xb28 [ 18.534806] __do_softirq+0x1c/0x28 [ 18.534841] [ 18.534875] Last potentially related work creation: [ 18.534909] kasan_save_stack+0x3c/0x68 [ 18.534949] kasan_record_aux_stack+0xb4/0xc8 [ 18.535089] __call_rcu_common.constprop.0+0x74/0x8c8 [ 18.535134] call_rcu+0x18/0x30 [ 18.535167] rcu_uaf+0x14c/0x2d8 [ 18.535273] kunit_try_run_case+0x170/0x3f0 [ 18.535373] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.535434] kthread+0x328/0x630 [ 18.535513] ret_from_fork+0x10/0x20 [ 18.535580] [ 18.535629] The buggy address belongs to the object at fff00000c56eb440 [ 18.535629] which belongs to the cache kmalloc-32 of size 32 [ 18.535721] The buggy address is located 0 bytes inside of [ 18.535721] freed 32-byte region [fff00000c56eb440, fff00000c56eb460) [ 18.535923] [ 18.536026] The buggy address belongs to the physical page: [ 18.536060] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1056eb [ 18.536442] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.536510] page_type: f5(slab) [ 18.536559] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.536844] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.536914] page dumped because: kasan: bad access detected [ 18.537117] [ 18.537189] Memory state around the buggy address: [ 18.537342] fff00000c56eb300: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 18.537405] fff00000c56eb380: fa fb fb fb fc fc fc fc 00 00 05 fc fc fc fc fc [ 18.537483] >fff00000c56eb400: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 18.537521] ^ [ 18.537556] fff00000c56eb480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.537598] fff00000c56eb500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.537744] ==================================================================
[ 12.178590] ================================================================== [ 12.179523] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 12.179759] Read of size 4 at addr ffff888102b1b840 by task swapper/0/0 [ 12.179976] [ 12.180071] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc4 #1 PREEMPT(voluntary) [ 12.180118] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.180130] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.180152] Call Trace: [ 12.180182] <IRQ> [ 12.180202] dump_stack_lvl+0x73/0xb0 [ 12.180303] print_report+0xd1/0x650 [ 12.180492] ? __virt_addr_valid+0x1db/0x2d0 [ 12.180775] ? rcu_uaf_reclaim+0x50/0x60 [ 12.180801] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.180824] ? rcu_uaf_reclaim+0x50/0x60 [ 12.180844] kasan_report+0x141/0x180 [ 12.180866] ? rcu_uaf_reclaim+0x50/0x60 [ 12.180891] __asan_report_load4_noabort+0x18/0x20 [ 12.180914] rcu_uaf_reclaim+0x50/0x60 [ 12.180945] rcu_core+0x66f/0x1c40 [ 12.180975] ? __pfx_rcu_core+0x10/0x10 [ 12.180996] ? ktime_get+0x6b/0x150 [ 12.181017] ? handle_softirqs+0x18e/0x730 [ 12.181042] rcu_core_si+0x12/0x20 [ 12.181062] handle_softirqs+0x209/0x730 [ 12.181081] ? hrtimer_interrupt+0x2fe/0x780 [ 12.181103] ? __pfx_handle_softirqs+0x10/0x10 [ 12.181127] __irq_exit_rcu+0xc9/0x110 [ 12.181147] irq_exit_rcu+0x12/0x20 [ 12.181166] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.181190] </IRQ> [ 12.181222] <TASK> [ 12.181234] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.181328] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 12.181543] 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 [ 12.181623] RSP: 0000:ffffffffaf807dd8 EFLAGS: 00010216 [ 12.181710] RAX: ffff8881aa474000 RBX: ffffffffaf81cac0 RCX: ffffffffae6720e5 [ 12.181754] RDX: ffffed102b60618b RSI: 0000000000000004 RDI: 0000000000004f6c [ 12.181796] RBP: ffffffffaf807de0 R08: 0000000000000001 R09: ffffed102b60618a [ 12.181838] R10: ffff88815b030c53 R11: 0000000000070800 R12: 0000000000000000 [ 12.181879] R13: fffffbfff5f03958 R14: ffffffffb03b0e90 R15: 0000000000000000 [ 12.181948] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 12.182000] ? default_idle+0xd/0x20 [ 12.182022] arch_cpu_idle+0xd/0x20 [ 12.182044] default_idle_call+0x48/0x80 [ 12.182062] do_idle+0x379/0x4f0 [ 12.182087] ? __pfx_do_idle+0x10/0x10 [ 12.182114] cpu_startup_entry+0x5c/0x70 [ 12.182137] rest_init+0x11a/0x140 [ 12.182153] ? acpi_subsystem_init+0x5d/0x150 [ 12.182178] start_kernel+0x330/0x410 [ 12.182203] x86_64_start_reservations+0x1c/0x30 [ 12.182226] x86_64_start_kernel+0x10d/0x120 [ 12.182249] common_startup_64+0x13e/0x148 [ 12.182281] </TASK> [ 12.182293] [ 12.198789] Allocated by task 215: [ 12.199142] kasan_save_stack+0x45/0x70 [ 12.199477] kasan_save_track+0x18/0x40 [ 12.199876] kasan_save_alloc_info+0x3b/0x50 [ 12.200248] __kasan_kmalloc+0xb7/0xc0 [ 12.200440] __kmalloc_cache_noprof+0x189/0x420 [ 12.200838] rcu_uaf+0xb0/0x330 [ 12.201020] kunit_try_run_case+0x1a5/0x480 [ 12.201539] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.201790] kthread+0x337/0x6f0 [ 12.201955] ret_from_fork+0x116/0x1d0 [ 12.202155] ret_from_fork_asm+0x1a/0x30 [ 12.202353] [ 12.202451] Freed by task 0: [ 12.203124] kasan_save_stack+0x45/0x70 [ 12.203428] kasan_save_track+0x18/0x40 [ 12.203846] kasan_save_free_info+0x3f/0x60 [ 12.204288] __kasan_slab_free+0x56/0x70 [ 12.204855] kfree+0x222/0x3f0 [ 12.205055] rcu_uaf_reclaim+0x1f/0x60 [ 12.205350] rcu_core+0x66f/0x1c40 [ 12.205709] rcu_core_si+0x12/0x20 [ 12.205900] handle_softirqs+0x209/0x730 [ 12.206581] __irq_exit_rcu+0xc9/0x110 [ 12.206778] irq_exit_rcu+0x12/0x20 [ 12.207158] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.207387] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.207808] [ 12.208164] Last potentially related work creation: [ 12.208389] kasan_save_stack+0x45/0x70 [ 12.208621] kasan_record_aux_stack+0xb2/0xc0 [ 12.209160] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 12.209655] call_rcu+0x12/0x20 [ 12.209948] rcu_uaf+0x168/0x330 [ 12.210235] kunit_try_run_case+0x1a5/0x480 [ 12.210740] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.211023] kthread+0x337/0x6f0 [ 12.211519] ret_from_fork+0x116/0x1d0 [ 12.211837] ret_from_fork_asm+0x1a/0x30 [ 12.212221] [ 12.212453] The buggy address belongs to the object at ffff888102b1b840 [ 12.212453] which belongs to the cache kmalloc-32 of size 32 [ 12.213236] The buggy address is located 0 bytes inside of [ 12.213236] freed 32-byte region [ffff888102b1b840, ffff888102b1b860) [ 12.214299] [ 12.214399] The buggy address belongs to the physical page: [ 12.214907] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b1b [ 12.215745] flags: 0x200000000000000(node=0|zone=2) [ 12.216133] page_type: f5(slab) [ 12.216299] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.216955] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.217517] page dumped because: kasan: bad access detected [ 12.217768] [ 12.217883] Memory state around the buggy address: [ 12.218105] ffff888102b1b700: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 12.218921] ffff888102b1b780: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 12.219414] >ffff888102b1b800: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 12.219953] ^ [ 12.220416] ffff888102b1b880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.221093] ffff888102b1b900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.221525] ==================================================================