Date
June 7, 2025, 10:40 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 23.183996] ================================================================== [ 23.184281] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 23.184457] Read of size 4 at addr fff00000c7765900 by task swapper/1/0 [ 23.184580] [ 23.184674] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.2-rc1 #1 PREEMPT [ 23.184891] Tainted: [B]=BAD_PAGE, [N]=TEST [ 23.184960] Hardware name: linux,dummy-virt (DT) [ 23.185039] Call trace: [ 23.185098] show_stack+0x20/0x38 (C) [ 23.186731] dump_stack_lvl+0x8c/0xd0 [ 23.187385] print_report+0x118/0x608 [ 23.187538] kasan_report+0xdc/0x128 [ 23.187653] __asan_report_load4_noabort+0x20/0x30 [ 23.187780] rcu_uaf_reclaim+0x64/0x70 [ 23.187870] rcu_core+0x9f4/0x1e20 [ 23.187958] rcu_core_si+0x18/0x30 [ 23.188077] handle_softirqs+0x374/0xb28 [ 23.188191] __do_softirq+0x1c/0x28 [ 23.188286] ____do_softirq+0x18/0x30 [ 23.188389] call_on_irq_stack+0x24/0x58 [ 23.188582] do_softirq_own_stack+0x24/0x38 [ 23.188713] __irq_exit_rcu+0x1fc/0x318 [ 23.188827] irq_exit_rcu+0x1c/0x80 [ 23.188947] el1_interrupt+0x38/0x58 [ 23.189142] el1h_64_irq_handler+0x18/0x28 [ 23.189257] el1h_64_irq+0x6c/0x70 [ 23.189794] arch_local_irq_enable+0x4/0x8 (P) [ 23.190038] do_idle+0x384/0x4e8 [ 23.190238] cpu_startup_entry+0x64/0x80 [ 23.190373] secondary_start_kernel+0x288/0x340 [ 23.190876] __secondary_switched+0xc0/0xc8 [ 23.191248] [ 23.191300] Allocated by task 202: [ 23.191486] kasan_save_stack+0x3c/0x68 [ 23.191600] kasan_save_track+0x20/0x40 [ 23.191680] kasan_save_alloc_info+0x40/0x58 [ 23.191754] __kasan_kmalloc+0xd4/0xd8 [ 23.191822] __kmalloc_cache_noprof+0x16c/0x3c0 [ 23.191913] rcu_uaf+0xb0/0x2d8 [ 23.191987] kunit_try_run_case+0x170/0x3f0 [ 23.192389] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 23.192852] kthread+0x328/0x630 [ 23.193058] ret_from_fork+0x10/0x20 [ 23.193561] [ 23.193709] Freed by task 0: [ 23.193809] kasan_save_stack+0x3c/0x68 [ 23.193923] kasan_save_track+0x20/0x40 [ 23.194088] kasan_save_free_info+0x4c/0x78 [ 23.194196] __kasan_slab_free+0x6c/0x98 [ 23.194520] kfree+0x214/0x3c8 [ 23.194626] rcu_uaf_reclaim+0x28/0x70 [ 23.194735] rcu_core+0x9f4/0x1e20 [ 23.195202] rcu_core_si+0x18/0x30 [ 23.195365] handle_softirqs+0x374/0xb28 [ 23.195464] __do_softirq+0x1c/0x28 [ 23.195547] [ 23.195648] Last potentially related work creation: [ 23.196069] kasan_save_stack+0x3c/0x68 [ 23.196271] kasan_record_aux_stack+0xb4/0xc8 [ 23.196458] __call_rcu_common.constprop.0+0x70/0x8b0 [ 23.196585] call_rcu+0x18/0x30 [ 23.196664] rcu_uaf+0x14c/0x2d8 [ 23.196753] kunit_try_run_case+0x170/0x3f0 [ 23.196854] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 23.197483] kthread+0x328/0x630 [ 23.197750] ret_from_fork+0x10/0x20 [ 23.198044] [ 23.198150] The buggy address belongs to the object at fff00000c7765900 [ 23.198150] which belongs to the cache kmalloc-32 of size 32 [ 23.198487] The buggy address is located 0 bytes inside of [ 23.198487] freed 32-byte region [fff00000c7765900, fff00000c7765920) [ 23.199070] [ 23.199123] The buggy address belongs to the physical page: [ 23.199196] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107765 [ 23.199468] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 23.199812] page_type: f5(slab) [ 23.200074] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 23.200384] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 23.200530] page dumped because: kasan: bad access detected [ 23.200729] [ 23.200773] Memory state around the buggy address: [ 23.200964] fff00000c7765800: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 23.201330] fff00000c7765880: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 23.201718] >fff00000c7765900: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 23.201827] ^ [ 23.201901] fff00000c7765980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.202012] fff00000c7765a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.202100] ==================================================================
[ 14.420835] ================================================================== [ 14.421398] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 14.421867] Read of size 4 at addr ffff888102d9fc40 by task swapper/1/0 [ 14.422097] [ 14.422396] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.2-rc1 #1 PREEMPT(voluntary) [ 14.422494] Tainted: [B]=BAD_PAGE, [N]=TEST [ 14.422510] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 14.422533] Call Trace: [ 14.422595] <IRQ> [ 14.422632] dump_stack_lvl+0x73/0xb0 [ 14.422693] print_report+0xd1/0x650 [ 14.422735] ? __virt_addr_valid+0x1db/0x2d0 [ 14.422805] ? rcu_uaf_reclaim+0x50/0x60 [ 14.422839] ? kasan_complete_mode_report_info+0x64/0x200 [ 14.422878] ? rcu_uaf_reclaim+0x50/0x60 [ 14.422916] kasan_report+0x141/0x180 [ 14.422960] ? rcu_uaf_reclaim+0x50/0x60 [ 14.423001] __asan_report_load4_noabort+0x18/0x20 [ 14.423040] rcu_uaf_reclaim+0x50/0x60 [ 14.423099] rcu_core+0x66c/0x1c30 [ 14.423157] ? enqueue_hrtimer+0xfe/0x210 [ 14.423207] ? __pfx_rcu_core+0x10/0x10 [ 14.423254] ? ktime_get+0x6b/0x150 [ 14.423299] ? handle_softirqs+0x18e/0x730 [ 14.423349] rcu_core_si+0x12/0x20 [ 14.423407] handle_softirqs+0x209/0x730 [ 14.423447] ? hrtimer_interrupt+0x2fe/0x780 [ 14.423489] ? __pfx_handle_softirqs+0x10/0x10 [ 14.423539] __irq_exit_rcu+0xc9/0x110 [ 14.423579] irq_exit_rcu+0x12/0x20 [ 14.423599] sysvec_apic_timer_interrupt+0x81/0x90 [ 14.423633] </IRQ> [ 14.423689] <TASK> [ 14.423708] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 14.423896] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 14.424296] 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 83 2d 28 00 fb f4 <e9> fc 1f 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 14.424420] RSP: 0000:ffff88810086fdc8 EFLAGS: 00010206 [ 14.424538] RAX: ffff8881bf393000 RBX: ffff8881008353c0 RCX: ffffffff99807015 [ 14.424599] RDX: ffffed102b626103 RSI: 0000000000000004 RDI: 00000000000103f4 [ 14.424644] RBP: ffff88810086fdd0 R08: 0000000000000001 R09: ffffed102b626102 [ 14.424722] R10: ffff88815b130813 R11: 000000000001ec00 R12: 0000000000000001 [ 14.424772] R13: ffffed1020106a78 R14: ffffffff9b59bc10 R15: 0000000000000000 [ 14.424838] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 14.424905] ? default_idle+0xd/0x20 [ 14.424925] arch_cpu_idle+0xd/0x20 [ 14.424944] default_idle_call+0x48/0x80 [ 14.424963] do_idle+0x379/0x4f0 [ 14.424989] ? __pfx_do_idle+0x10/0x10 [ 14.425008] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 14.425032] ? complete+0x15b/0x1d0 [ 14.425056] cpu_startup_entry+0x5c/0x70 [ 14.425076] start_secondary+0x211/0x290 [ 14.425097] ? __pfx_start_secondary+0x10/0x10 [ 14.425121] common_startup_64+0x13e/0x148 [ 14.425153] </TASK> [ 14.425166] [ 14.439237] Allocated by task 218: [ 14.440396] kasan_save_stack+0x45/0x70 [ 14.440681] kasan_save_track+0x18/0x40 [ 14.440840] kasan_save_alloc_info+0x3b/0x50 [ 14.441117] __kasan_kmalloc+0xb7/0xc0 [ 14.441405] __kmalloc_cache_noprof+0x189/0x420 [ 14.442117] rcu_uaf+0xb0/0x330 [ 14.442273] kunit_try_run_case+0x1a5/0x480 [ 14.442524] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.443271] kthread+0x337/0x6f0 [ 14.443605] ret_from_fork+0x41/0x80 [ 14.444087] ret_from_fork_asm+0x1a/0x30 [ 14.444257] [ 14.444364] Freed by task 0: [ 14.444600] kasan_save_stack+0x45/0x70 [ 14.445183] kasan_save_track+0x18/0x40 [ 14.445353] kasan_save_free_info+0x3f/0x60 [ 14.445684] __kasan_slab_free+0x56/0x70 [ 14.445986] kfree+0x222/0x3f0 [ 14.446233] rcu_uaf_reclaim+0x1f/0x60 [ 14.446486] rcu_core+0x66c/0x1c30 [ 14.447165] rcu_core_si+0x12/0x20 [ 14.447346] handle_softirqs+0x209/0x730 [ 14.447834] __irq_exit_rcu+0xc9/0x110 [ 14.448066] irq_exit_rcu+0x12/0x20 [ 14.448329] sysvec_apic_timer_interrupt+0x81/0x90 [ 14.448665] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 14.448938] [ 14.449163] Last potentially related work creation: [ 14.449404] kasan_save_stack+0x45/0x70 [ 14.450191] kasan_record_aux_stack+0xb2/0xc0 [ 14.450366] __call_rcu_common.constprop.0+0x72/0x9c0 [ 14.450697] call_rcu+0x12/0x20 [ 14.451224] rcu_uaf+0x168/0x330 [ 14.451580] kunit_try_run_case+0x1a5/0x480 [ 14.451991] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.452341] kthread+0x337/0x6f0 [ 14.452585] ret_from_fork+0x41/0x80 [ 14.453099] ret_from_fork_asm+0x1a/0x30 [ 14.453306] [ 14.453459] The buggy address belongs to the object at ffff888102d9fc40 [ 14.453459] which belongs to the cache kmalloc-32 of size 32 [ 14.454380] The buggy address is located 0 bytes inside of [ 14.454380] freed 32-byte region [ffff888102d9fc40, ffff888102d9fc60) [ 14.455164] [ 14.455502] The buggy address belongs to the physical page: [ 14.456090] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102d9f [ 14.456922] flags: 0x200000000000000(node=0|zone=2) [ 14.457280] page_type: f5(slab) [ 14.457492] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 14.458057] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 14.458220] page dumped because: kasan: bad access detected [ 14.458330] [ 14.458386] Memory state around the buggy address: [ 14.458495] ffff888102d9fb00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 14.458665] ffff888102d9fb80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 14.459219] >ffff888102d9fc00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 14.459718] ^ [ 14.460100] ffff888102d9fc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.461439] ffff888102d9fd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.461791] ==================================================================