Date
July 8, 2025, 4:38 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.193463] ================================================================== [ 18.193585] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 18.193656] Read of size 4 at addr fff00000c6385340 by task swapper/1/0 [ 18.193704] [ 18.193744] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.6-rc1 #1 PREEMPT [ 18.193828] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.193855] Hardware name: linux,dummy-virt (DT) [ 18.193888] Call trace: [ 18.193911] show_stack+0x20/0x38 (C) [ 18.193963] dump_stack_lvl+0x8c/0xd0 [ 18.194012] print_report+0x118/0x608 [ 18.194058] kasan_report+0xdc/0x128 [ 18.194100] __asan_report_load4_noabort+0x20/0x30 [ 18.194151] rcu_uaf_reclaim+0x64/0x70 [ 18.194198] rcu_core+0x9f4/0x1e20 [ 18.194246] rcu_core_si+0x18/0x30 [ 18.194289] handle_softirqs+0x374/0xb28 [ 18.194349] __do_softirq+0x1c/0x28 [ 18.194390] ____do_softirq+0x18/0x30 [ 18.194437] call_on_irq_stack+0x24/0x30 [ 18.194482] do_softirq_own_stack+0x24/0x38 [ 18.194528] __irq_exit_rcu+0x1fc/0x318 [ 18.194573] irq_exit_rcu+0x1c/0x80 [ 18.194617] el1_interrupt+0x38/0x58 [ 18.194659] el1h_64_irq_handler+0x18/0x28 [ 18.194705] el1h_64_irq+0x6c/0x70 [ 18.194790] arch_local_irq_enable+0x4/0x8 (P) [ 18.194845] do_idle+0x384/0x4e8 [ 18.194888] cpu_startup_entry+0x64/0x80 [ 18.194931] secondary_start_kernel+0x288/0x340 [ 18.194982] __secondary_switched+0xc0/0xc8 [ 18.195034] [ 18.195052] Allocated by task 200: [ 18.195081] kasan_save_stack+0x3c/0x68 [ 18.195121] kasan_save_track+0x20/0x40 [ 18.195158] kasan_save_alloc_info+0x40/0x58 [ 18.195195] __kasan_kmalloc+0xd4/0xd8 [ 18.195233] __kmalloc_cache_noprof+0x16c/0x3c0 [ 18.195270] rcu_uaf+0xb0/0x2d8 [ 18.195305] kunit_try_run_case+0x170/0x3f0 [ 18.195509] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.195572] kthread+0x328/0x630 [ 18.195681] ret_from_fork+0x10/0x20 [ 18.195957] [ 18.195977] Freed by task 0: [ 18.196005] kasan_save_stack+0x3c/0x68 [ 18.196042] kasan_save_track+0x20/0x40 [ 18.196079] kasan_save_free_info+0x4c/0x78 [ 18.196116] __kasan_slab_free+0x6c/0x98 [ 18.196154] kfree+0x214/0x3c8 [ 18.197028] rcu_uaf_reclaim+0x28/0x70 [ 18.197081] rcu_core+0x9f4/0x1e20 [ 18.197118] rcu_core_si+0x18/0x30 [ 18.197317] handle_softirqs+0x374/0xb28 [ 18.197368] __do_softirq+0x1c/0x28 [ 18.197403] [ 18.197434] Last potentially related work creation: [ 18.197469] kasan_save_stack+0x3c/0x68 [ 18.197866] kasan_record_aux_stack+0xb4/0xc8 [ 18.197910] __call_rcu_common.constprop.0+0x74/0x8c8 [ 18.197951] call_rcu+0x18/0x30 [ 18.197983] rcu_uaf+0x14c/0x2d8 [ 18.198020] kunit_try_run_case+0x170/0x3f0 [ 18.199350] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.199405] kthread+0x328/0x630 [ 18.199443] ret_from_fork+0x10/0x20 [ 18.199488] [ 18.199515] The buggy address belongs to the object at fff00000c6385340 [ 18.199515] which belongs to the cache kmalloc-32 of size 32 [ 18.199573] The buggy address is located 0 bytes inside of [ 18.199573] freed 32-byte region [fff00000c6385340, fff00000c6385360) [ 18.199633] [ 18.199656] The buggy address belongs to the physical page: [ 18.199687] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106385 [ 18.199741] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.199793] page_type: f5(slab) [ 18.199835] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.199884] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.199924] page dumped because: kasan: bad access detected [ 18.199958] [ 18.199976] Memory state around the buggy address: [ 18.200023] fff00000c6385200: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 18.200067] fff00000c6385280: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 18.200121] >fff00000c6385300: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 18.200158] ^ [ 18.200192] fff00000c6385380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.200235] fff00000c6385400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.200284] ==================================================================
[ 11.882978] ================================================================== [ 11.883494] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 11.883733] Read of size 4 at addr ffff8881035f8980 by task swapper/0/0 [ 11.883976] [ 11.884068] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.15.6-rc1 #1 PREEMPT(voluntary) [ 11.884130] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.884142] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.884166] Call Trace: [ 11.884192] <IRQ> [ 11.884208] dump_stack_lvl+0x73/0xb0 [ 11.884237] print_report+0xd1/0x650 [ 11.884262] ? __virt_addr_valid+0x1db/0x2d0 [ 11.884285] ? rcu_uaf_reclaim+0x50/0x60 [ 11.884307] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.884330] ? rcu_uaf_reclaim+0x50/0x60 [ 11.884352] kasan_report+0x141/0x180 [ 11.884376] ? rcu_uaf_reclaim+0x50/0x60 [ 11.884402] __asan_report_load4_noabort+0x18/0x20 [ 11.884424] rcu_uaf_reclaim+0x50/0x60 [ 11.884446] rcu_core+0x66c/0x1c30 [ 11.884477] ? __pfx_rcu_core+0x10/0x10 [ 11.884500] ? ktime_get+0x6b/0x150 [ 11.884530] rcu_core_si+0x12/0x20 [ 11.884548] handle_softirqs+0x209/0x730 [ 11.884572] ? hrtimer_interrupt+0x2fe/0x780 [ 11.884597] ? __pfx_handle_softirqs+0x10/0x10 [ 11.884624] __irq_exit_rcu+0xc9/0x110 [ 11.884646] irq_exit_rcu+0x12/0x20 [ 11.884664] sysvec_apic_timer_interrupt+0x81/0x90 [ 11.884686] </IRQ> [ 11.884710] <TASK> [ 11.884721] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 11.884807] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 11.885025] 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 63 86 27 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 [ 11.885111] RSP: 0000:ffffffff95407dd8 EFLAGS: 00010212 [ 11.885206] RAX: ffff8881c4890000 RBX: ffffffff9541ca80 RCX: ffffffff94211f75 [ 11.885253] RDX: ffffed102b606103 RSI: 0000000000000004 RDI: 00000000000064bc [ 11.885304] RBP: ffffffff95407de0 R08: 0000000000000001 R09: ffffed102b606102 [ 11.885350] R10: ffff88815b030813 R11: ffffffff967a5300 R12: 0000000000000000 [ 11.885394] R13: fffffbfff2a83950 R14: ffffffff95f9ca10 R15: 0000000000000000 [ 11.885452] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 11.885505] ? default_idle+0xd/0x20 [ 11.885527] arch_cpu_idle+0xd/0x20 [ 11.885547] default_idle_call+0x48/0x80 [ 11.885568] do_idle+0x379/0x4f0 [ 11.885592] ? __pfx_do_idle+0x10/0x10 [ 11.885612] ? trace_preempt_on+0x20/0xc0 [ 11.885636] ? schedule+0x86/0x2e0 [ 11.885657] ? preempt_count_sub+0x50/0x80 [ 11.885681] cpu_startup_entry+0x5c/0x70 [ 11.885702] rest_init+0x11a/0x140 [ 11.885722] ? acpi_subsystem_init+0x5d/0x150 [ 11.885750] start_kernel+0x32b/0x410 [ 11.885774] x86_64_start_reservations+0x1c/0x30 [ 11.885798] x86_64_start_kernel+0xcf/0xe0 [ 11.885820] common_startup_64+0x13e/0x148 [ 11.885853] </TASK> [ 11.885865] [ 11.898228] Allocated by task 218: [ 11.898414] kasan_save_stack+0x45/0x70 [ 11.898610] kasan_save_track+0x18/0x40 [ 11.899174] kasan_save_alloc_info+0x3b/0x50 [ 11.899351] __kasan_kmalloc+0xb7/0xc0 [ 11.899704] __kmalloc_cache_noprof+0x189/0x420 [ 11.900010] rcu_uaf+0xb0/0x330 [ 11.900154] kunit_try_run_case+0x1a5/0x480 [ 11.900441] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.900816] kthread+0x337/0x6f0 [ 11.900999] ret_from_fork+0x41/0x80 [ 11.901288] ret_from_fork_asm+0x1a/0x30 [ 11.901491] [ 11.901577] Freed by task 0: [ 11.901720] kasan_save_stack+0x45/0x70 [ 11.901911] kasan_save_track+0x18/0x40 [ 11.902100] kasan_save_free_info+0x3f/0x60 [ 11.902287] __kasan_slab_free+0x56/0x70 [ 11.902470] kfree+0x222/0x3f0 [ 11.903032] rcu_uaf_reclaim+0x1f/0x60 [ 11.903220] rcu_core+0x66c/0x1c30 [ 11.903356] rcu_core_si+0x12/0x20 [ 11.903748] handle_softirqs+0x209/0x730 [ 11.903953] __irq_exit_rcu+0xc9/0x110 [ 11.904262] irq_exit_rcu+0x12/0x20 [ 11.904420] sysvec_apic_timer_interrupt+0x81/0x90 [ 11.904676] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 11.905032] [ 11.905160] Last potentially related work creation: [ 11.905363] kasan_save_stack+0x45/0x70 [ 11.905586] kasan_record_aux_stack+0xb2/0xc0 [ 11.906145] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 11.906442] call_rcu+0x12/0x20 [ 11.906572] rcu_uaf+0x168/0x330 [ 11.907053] kunit_try_run_case+0x1a5/0x480 [ 11.907349] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.907629] kthread+0x337/0x6f0 [ 11.907890] ret_from_fork+0x41/0x80 [ 11.908039] ret_from_fork_asm+0x1a/0x30 [ 11.908252] [ 11.908354] The buggy address belongs to the object at ffff8881035f8980 [ 11.908354] which belongs to the cache kmalloc-32 of size 32 [ 11.909153] The buggy address is located 0 bytes inside of [ 11.909153] freed 32-byte region [ffff8881035f8980, ffff8881035f89a0) [ 11.909648] [ 11.909898] The buggy address belongs to the physical page: [ 11.910142] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1035f8 [ 11.910632] flags: 0x200000000000000(node=0|zone=2) [ 11.910955] page_type: f5(slab) [ 11.911140] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 11.911649] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 11.911978] page dumped because: kasan: bad access detected [ 11.912217] [ 11.912299] Memory state around the buggy address: [ 11.912519] ffff8881035f8880: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 11.913107] ffff8881035f8900: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 11.913486] >ffff8881035f8980: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 11.913809] ^ [ 11.913979] ffff8881035f8a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.914273] ffff8881035f8a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.914823] ==================================================================