Date
May 29, 2025, 7:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 22.372677] ================================================================== [ 22.372955] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 22.373117] Read of size 4 at addr fff00000c669e440 by task swapper/1/0 [ 22.373237] [ 22.373332] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.0-next-20250529 #1 PREEMPT [ 22.376695] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.376852] Hardware name: linux,dummy-virt (DT) [ 22.376955] Call trace: [ 22.377016] show_stack+0x20/0x38 (C) [ 22.377172] dump_stack_lvl+0x8c/0xd0 [ 22.377349] print_report+0x118/0x608 [ 22.377481] kasan_report+0xdc/0x128 [ 22.377946] __asan_report_load4_noabort+0x20/0x30 [ 22.378172] rcu_uaf_reclaim+0x64/0x70 [ 22.378333] rcu_core+0x9f4/0x1e20 [ 22.378547] rcu_core_si+0x18/0x30 [ 22.378655] handle_softirqs+0x374/0xb28 [ 22.379014] __do_softirq+0x1c/0x28 [ 22.379171] ____do_softirq+0x18/0x30 [ 22.379340] call_on_irq_stack+0x24/0x30 [ 22.379479] do_softirq_own_stack+0x24/0x38 [ 22.379652] __irq_exit_rcu+0x1fc/0x318 [ 22.379814] irq_exit_rcu+0x1c/0x80 [ 22.379959] el1_interrupt+0x38/0x58 [ 22.380073] el1h_64_irq_handler+0x18/0x28 [ 22.380195] el1h_64_irq+0x6c/0x70 [ 22.380453] arch_local_irq_enable+0x4/0x8 (P) [ 22.380955] do_idle+0x384/0x4e8 [ 22.381091] cpu_startup_entry+0x64/0x80 [ 22.381491] secondary_start_kernel+0x288/0x340 [ 22.381642] __secondary_switched+0xc0/0xc8 [ 22.381779] [ 22.381832] Allocated by task 198: [ 22.381906] kasan_save_stack+0x3c/0x68 [ 22.382016] kasan_save_track+0x20/0x40 [ 22.382117] kasan_save_alloc_info+0x40/0x58 [ 22.382211] __kasan_kmalloc+0xd4/0xd8 [ 22.382314] __kmalloc_cache_noprof+0x15c/0x3c0 [ 22.382459] rcu_uaf+0xb0/0x2d8 [ 22.382952] kunit_try_run_case+0x170/0x3f0 [ 22.383095] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 22.383204] kthread+0x328/0x630 [ 22.383322] ret_from_fork+0x10/0x20 [ 22.383450] [ 22.383532] Freed by task 0: [ 22.383617] kasan_save_stack+0x3c/0x68 [ 22.383720] kasan_save_track+0x20/0x40 [ 22.383817] kasan_save_free_info+0x4c/0x78 [ 22.383910] __kasan_slab_free+0x6c/0x98 [ 22.384011] kfree+0x214/0x3c8 [ 22.384099] rcu_uaf_reclaim+0x28/0x70 [ 22.384199] rcu_core+0x9f4/0x1e20 [ 22.384284] rcu_core_si+0x18/0x30 [ 22.384516] handle_softirqs+0x374/0xb28 [ 22.384837] __do_softirq+0x1c/0x28 [ 22.384963] [ 22.385099] Last potentially related work creation: [ 22.385189] kasan_save_stack+0x3c/0x68 [ 22.385285] kasan_record_aux_stack+0xb4/0xc8 [ 22.385387] __call_rcu_common.constprop.0+0x70/0x8b0 [ 22.385747] call_rcu+0x18/0x30 [ 22.385851] rcu_uaf+0x14c/0x2d8 [ 22.385936] kunit_try_run_case+0x170/0x3f0 [ 22.386033] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 22.386144] kthread+0x328/0x630 [ 22.386220] ret_from_fork+0x10/0x20 [ 22.386872] [ 22.387061] The buggy address belongs to the object at fff00000c669e440 [ 22.387061] which belongs to the cache kmalloc-32 of size 32 [ 22.387261] The buggy address is located 0 bytes inside of [ 22.387261] freed 32-byte region [fff00000c669e440, fff00000c669e460) [ 22.387385] [ 22.387444] The buggy address belongs to the physical page: [ 22.387539] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10669e [ 22.387665] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 22.388050] page_type: f5(slab) [ 22.388185] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 22.388347] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 22.388470] page dumped because: kasan: bad access detected [ 22.388550] [ 22.388596] Memory state around the buggy address: [ 22.388685] fff00000c669e300: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 22.388799] fff00000c669e380: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 22.388909] >fff00000c669e400: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 22.389006] ^ [ 22.389097] fff00000c669e480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.389210] fff00000c669e500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.389310] ==================================================================
[ 11.415872] ================================================================== [ 11.416572] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 11.417262] Read of size 4 at addr ffff8881028a3680 by task swapper/1/0 [ 11.417784] [ 11.418049] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.0-next-20250529 #1 PREEMPT(voluntary) [ 11.418106] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.418119] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.418142] Call Trace: [ 11.418207] <IRQ> [ 11.418231] dump_stack_lvl+0x73/0xb0 [ 11.418265] print_report+0xd1/0x650 [ 11.418288] ? __virt_addr_valid+0x1db/0x2d0 [ 11.418313] ? rcu_uaf_reclaim+0x50/0x60 [ 11.418333] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.418355] ? rcu_uaf_reclaim+0x50/0x60 [ 11.418376] kasan_report+0x141/0x180 [ 11.418398] ? rcu_uaf_reclaim+0x50/0x60 [ 11.418424] __asan_report_load4_noabort+0x18/0x20 [ 11.418445] rcu_uaf_reclaim+0x50/0x60 [ 11.418467] rcu_core+0x66f/0x1c40 [ 11.418496] ? __pfx_rcu_core+0x10/0x10 [ 11.418518] ? ktime_get+0x6b/0x150 [ 11.418547] ? handle_softirqs+0x18e/0x730 [ 11.418572] rcu_core_si+0x12/0x20 [ 11.418593] handle_softirqs+0x209/0x730 [ 11.418624] ? hrtimer_interrupt+0x2fe/0x780 [ 11.418646] ? __pfx_handle_softirqs+0x10/0x10 [ 11.418672] __irq_exit_rcu+0xc9/0x110 [ 11.418692] irq_exit_rcu+0x12/0x20 [ 11.418711] sysvec_apic_timer_interrupt+0x81/0x90 [ 11.418738] </IRQ> [ 11.418768] <TASK> [ 11.418780] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 11.418870] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 11.419076] 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 23 a8 1d 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 11.419166] RSP: 0000:ffff88810087fdc8 EFLAGS: 00010216 [ 11.419258] RAX: ffff8881c975b000 RBX: ffff88810085b000 RCX: ffffffff88ab1245 [ 11.419305] RDX: ffffed102a8e618b RSI: 0000000000000004 RDI: 000000000001ce7c [ 11.419348] RBP: ffff88810087fdd0 R08: 0000000000000001 R09: ffffed102a8e618a [ 11.419389] R10: ffff888154730c53 R11: 0000000000012800 R12: 0000000000000001 [ 11.419431] R13: ffffed102010b600 R14: ffffffff8a7c3190 R15: 0000000000000000 [ 11.419489] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 11.419539] ? default_idle+0xd/0x20 [ 11.419559] arch_cpu_idle+0xd/0x20 [ 11.419577] default_idle_call+0x48/0x80 [ 11.419597] do_idle+0x379/0x4f0 [ 11.419628] ? complete+0x15b/0x1d0 [ 11.419647] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.419673] ? __pfx_do_idle+0x10/0x10 [ 11.419690] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 11.419714] ? complete+0x15b/0x1d0 [ 11.419735] cpu_startup_entry+0x5c/0x70 [ 11.419755] start_secondary+0x211/0x290 [ 11.419777] ? __pfx_start_secondary+0x10/0x10 [ 11.419803] common_startup_64+0x13e/0x148 [ 11.419836] </TASK> [ 11.419847] [ 11.434067] Allocated by task 215: [ 11.434363] kasan_save_stack+0x45/0x70 [ 11.434780] kasan_save_track+0x18/0x40 [ 11.435083] kasan_save_alloc_info+0x3b/0x50 [ 11.435300] __kasan_kmalloc+0xb7/0xc0 [ 11.435484] __kmalloc_cache_noprof+0x189/0x420 [ 11.435702] rcu_uaf+0xb0/0x330 [ 11.436121] kunit_try_run_case+0x1a5/0x480 [ 11.436538] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.437006] kthread+0x337/0x6f0 [ 11.437311] ret_from_fork+0x116/0x1d0 [ 11.437509] ret_from_fork_asm+0x1a/0x30 [ 11.437709] [ 11.438047] Freed by task 0: [ 11.438263] kasan_save_stack+0x45/0x70 [ 11.438597] kasan_save_track+0x18/0x40 [ 11.439136] kasan_save_free_info+0x3f/0x60 [ 11.439347] __kasan_slab_free+0x56/0x70 [ 11.439532] kfree+0x222/0x3f0 [ 11.439690] rcu_uaf_reclaim+0x1f/0x60 [ 11.440137] rcu_core+0x66f/0x1c40 [ 11.440438] rcu_core_si+0x12/0x20 [ 11.440735] handle_softirqs+0x209/0x730 [ 11.441139] __irq_exit_rcu+0xc9/0x110 [ 11.441324] irq_exit_rcu+0x12/0x20 [ 11.441487] sysvec_apic_timer_interrupt+0x81/0x90 [ 11.441716] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 11.442294] [ 11.442550] Last potentially related work creation: [ 11.442891] kasan_save_stack+0x45/0x70 [ 11.443237] kasan_record_aux_stack+0xb2/0xc0 [ 11.443443] __call_rcu_common.constprop.0+0x72/0x9d0 [ 11.443667] call_rcu+0x12/0x20 [ 11.444097] rcu_uaf+0x168/0x330 [ 11.444325] kunit_try_run_case+0x1a5/0x480 [ 11.444675] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.445135] kthread+0x337/0x6f0 [ 11.445314] ret_from_fork+0x116/0x1d0 [ 11.445487] ret_from_fork_asm+0x1a/0x30 [ 11.445692] [ 11.446071] The buggy address belongs to the object at ffff8881028a3680 [ 11.446071] which belongs to the cache kmalloc-32 of size 32 [ 11.446889] The buggy address is located 0 bytes inside of [ 11.446889] freed 32-byte region [ffff8881028a3680, ffff8881028a36a0) [ 11.447365] [ 11.447460] The buggy address belongs to the physical page: [ 11.447707] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1028a3 [ 11.448451] flags: 0x200000000000000(node=0|zone=2) [ 11.448929] page_type: f5(slab) [ 11.449245] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 11.449806] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 11.450267] page dumped because: kasan: bad access detected [ 11.450489] [ 11.450578] Memory state around the buggy address: [ 11.451061] ffff8881028a3580: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 11.451511] ffff8881028a3600: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 11.452270] >ffff8881028a3680: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 11.452566] ^ [ 11.452737] ffff8881028a3700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.453312] ffff8881028a3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.453903] ==================================================================