Date
May 15, 2025, 10:38 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 18.482844] ================================================================== [ 18.482980] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 18.483583] Read of size 4 at addr fff00000c17649c0 by task swapper/1/0 [ 18.483662] [ 18.483855] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.0-rc6-next-20250515 #1 PREEMPT [ 18.483978] Tainted: [B]=BAD_PAGE, [N]=TEST [ 18.484432] Hardware name: linux,dummy-virt (DT) [ 18.484547] Call trace: [ 18.484906] show_stack+0x20/0x38 (C) [ 18.485433] dump_stack_lvl+0x8c/0xd0 [ 18.485539] print_report+0x118/0x608 [ 18.485890] kasan_report+0xdc/0x128 [ 18.486092] __asan_report_load4_noabort+0x20/0x30 [ 18.486303] rcu_uaf_reclaim+0x64/0x70 [ 18.486461] rcu_core+0x9f4/0x1e20 [ 18.486698] rcu_core_si+0x18/0x30 [ 18.486908] handle_softirqs+0x374/0xb28 [ 18.487001] __do_softirq+0x1c/0x28 [ 18.487088] ____do_softirq+0x18/0x30 [ 18.487442] call_on_irq_stack+0x24/0x30 [ 18.487714] do_softirq_own_stack+0x24/0x38 [ 18.487829] __irq_exit_rcu+0x1fc/0x318 [ 18.488092] irq_exit_rcu+0x1c/0x80 [ 18.488325] el1_interrupt+0x38/0x58 [ 18.488376] el1h_64_irq_handler+0x18/0x28 [ 18.488422] el1h_64_irq+0x6c/0x70 [ 18.489171] arch_local_irq_enable+0x4/0x8 (P) [ 18.489624] do_idle+0x384/0x4e8 [ 18.489731] cpu_startup_entry+0x64/0x80 [ 18.490250] secondary_start_kernel+0x288/0x340 [ 18.490309] __secondary_switched+0xc0/0xc8 [ 18.490638] [ 18.490688] Allocated by task 198: [ 18.490720] kasan_save_stack+0x3c/0x68 [ 18.491098] kasan_save_track+0x20/0x40 [ 18.491210] kasan_save_alloc_info+0x40/0x58 [ 18.491383] __kasan_kmalloc+0xd4/0xd8 [ 18.491655] __kmalloc_cache_noprof+0x15c/0x3c0 [ 18.491782] rcu_uaf+0xb0/0x2d8 [ 18.491818] kunit_try_run_case+0x170/0x3f0 [ 18.491928] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.492055] kthread+0x328/0x630 [ 18.492514] ret_from_fork+0x10/0x20 [ 18.492673] [ 18.492761] Freed by task 0: [ 18.492985] kasan_save_stack+0x3c/0x68 [ 18.493252] kasan_save_track+0x20/0x40 [ 18.493302] kasan_save_free_info+0x4c/0x78 [ 18.493785] __kasan_slab_free+0x6c/0x98 [ 18.493828] kfree+0x214/0x3c8 [ 18.493870] rcu_uaf_reclaim+0x28/0x70 [ 18.494052] rcu_core+0x9f4/0x1e20 [ 18.494412] rcu_core_si+0x18/0x30 [ 18.494460] handle_softirqs+0x374/0xb28 [ 18.494687] __do_softirq+0x1c/0x28 [ 18.494722] [ 18.494759] Last potentially related work creation: [ 18.495361] kasan_save_stack+0x3c/0x68 [ 18.495450] kasan_record_aux_stack+0xb4/0xc8 [ 18.495679] __call_rcu_common.constprop.0+0x70/0x8b0 [ 18.496259] call_rcu+0x18/0x30 [ 18.496392] rcu_uaf+0x14c/0x2d8 [ 18.496427] kunit_try_run_case+0x170/0x3f0 [ 18.496998] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 18.497115] kthread+0x328/0x630 [ 18.497412] ret_from_fork+0x10/0x20 [ 18.497477] [ 18.497803] The buggy address belongs to the object at fff00000c17649c0 [ 18.497803] which belongs to the cache kmalloc-32 of size 32 [ 18.497872] The buggy address is located 0 bytes inside of [ 18.497872] freed 32-byte region [fff00000c17649c0, fff00000c17649e0) [ 18.498207] [ 18.498235] The buggy address belongs to the physical page: [ 18.498268] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101764 [ 18.498777] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 18.499369] page_type: f5(slab) [ 18.499650] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 18.499989] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 18.500362] page dumped because: kasan: bad access detected [ 18.500399] [ 18.500576] Memory state around the buggy address: [ 18.500787] fff00000c1764880: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 18.501094] fff00000c1764900: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 18.501440] >fff00000c1764980: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 18.501693] ^ [ 18.502049] fff00000c1764a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.502103] fff00000c1764a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.502310] ==================================================================
[ 14.696712] ================================================================== [ 14.697201] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 14.697707] Read of size 4 at addr ffff88810230d380 by task swapper/1/0 [ 14.698267] [ 14.698448] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.0-rc6-next-20250515 #1 PREEMPT(voluntary) [ 14.698540] Tainted: [B]=BAD_PAGE, [N]=TEST [ 14.698561] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 14.698589] Call Trace: [ 14.698629] <IRQ> [ 14.698652] dump_stack_lvl+0x73/0xb0 [ 14.698691] print_report+0xd1/0x650 [ 14.698716] ? __virt_addr_valid+0x1db/0x2d0 [ 14.698741] ? rcu_uaf_reclaim+0x50/0x60 [ 14.698761] ? kasan_complete_mode_report_info+0x64/0x200 [ 14.698782] ? rcu_uaf_reclaim+0x50/0x60 [ 14.698802] kasan_report+0x141/0x180 [ 14.698822] ? rcu_uaf_reclaim+0x50/0x60 [ 14.698847] __asan_report_load4_noabort+0x18/0x20 [ 14.698867] rcu_uaf_reclaim+0x50/0x60 [ 14.698886] rcu_core+0x66f/0x1c40 [ 14.698914] ? __pfx_rcu_core+0x10/0x10 [ 14.698935] ? ktime_get+0x6b/0x150 [ 14.698956] ? handle_softirqs+0x18e/0x730 [ 14.698982] rcu_core_si+0x12/0x20 [ 14.699001] handle_softirqs+0x209/0x730 [ 14.699019] ? hrtimer_interrupt+0x2fe/0x780 [ 14.699041] ? __pfx_handle_softirqs+0x10/0x10 [ 14.699066] __irq_exit_rcu+0xc9/0x110 [ 14.699085] irq_exit_rcu+0x12/0x20 [ 14.699103] sysvec_apic_timer_interrupt+0x81/0x90 [ 14.699127] </IRQ> [ 14.699156] <TASK> [ 14.699166] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 14.699302] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 14.699888] 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 a3 36 23 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 [ 14.700059] RSP: 0000:ffff888100877dc8 EFLAGS: 00010202 [ 14.700243] RAX: ffff8881b0976000 RBX: ffff888100853000 RCX: ffffffffa82583e5 [ 14.700321] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 000000000000c084 [ 14.700390] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a [ 14.700475] R10: ffff88815b130c53 R11: 0000000000016400 R12: 0000000000000001 [ 14.700555] R13: ffffed102010a600 R14: ffffffffa9fb0b90 R15: 0000000000000000 [ 14.700671] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 14.700802] ? default_idle+0xd/0x20 [ 14.700832] arch_cpu_idle+0xd/0x20 [ 14.700855] default_idle_call+0x48/0x80 [ 14.700875] do_idle+0x379/0x4f0 [ 14.700898] ? __pfx_do_idle+0x10/0x10 [ 14.700915] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 14.700937] ? complete+0x15b/0x1d0 [ 14.700959] cpu_startup_entry+0x5c/0x70 [ 14.700978] start_secondary+0x211/0x290 [ 14.701000] ? __pfx_start_secondary+0x10/0x10 [ 14.701024] common_startup_64+0x13e/0x148 [ 14.701057] </TASK> [ 14.701069] [ 14.715046] Allocated by task 216: [ 14.715624] kasan_save_stack+0x45/0x70 [ 14.716199] kasan_save_track+0x18/0x40 [ 14.716374] kasan_save_alloc_info+0x3b/0x50 [ 14.716686] __kasan_kmalloc+0xb7/0xc0 [ 14.716998] __kmalloc_cache_noprof+0x189/0x420 [ 14.717262] rcu_uaf+0xb0/0x330 [ 14.717760] kunit_try_run_case+0x1a5/0x480 [ 14.718082] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.718405] kthread+0x337/0x6f0 [ 14.718836] ret_from_fork+0x116/0x1d0 [ 14.719120] ret_from_fork_asm+0x1a/0x30 [ 14.719449] [ 14.719768] Freed by task 0: [ 14.719927] kasan_save_stack+0x45/0x70 [ 14.720196] kasan_save_track+0x18/0x40 [ 14.720888] kasan_save_free_info+0x3f/0x60 [ 14.721196] __kasan_slab_free+0x56/0x70 [ 14.721389] kfree+0x222/0x3f0 [ 14.721645] rcu_uaf_reclaim+0x1f/0x60 [ 14.721861] rcu_core+0x66f/0x1c40 [ 14.722375] rcu_core_si+0x12/0x20 [ 14.722686] handle_softirqs+0x209/0x730 [ 14.722943] __irq_exit_rcu+0xc9/0x110 [ 14.723113] irq_exit_rcu+0x12/0x20 [ 14.723309] sysvec_apic_timer_interrupt+0x81/0x90 [ 14.723870] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 14.724330] [ 14.724558] Last potentially related work creation: [ 14.725077] kasan_save_stack+0x45/0x70 [ 14.725397] kasan_record_aux_stack+0xb2/0xc0 [ 14.725589] __call_rcu_common.constprop.0+0x72/0x9d0 [ 14.725903] call_rcu+0x12/0x20 [ 14.726378] rcu_uaf+0x168/0x330 [ 14.726975] kunit_try_run_case+0x1a5/0x480 [ 14.727296] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 14.727758] kthread+0x337/0x6f0 [ 14.728048] ret_from_fork+0x116/0x1d0 [ 14.728317] ret_from_fork_asm+0x1a/0x30 [ 14.728809] [ 14.728959] The buggy address belongs to the object at ffff88810230d380 [ 14.728959] which belongs to the cache kmalloc-32 of size 32 [ 14.729843] The buggy address is located 0 bytes inside of [ 14.729843] freed 32-byte region [ffff88810230d380, ffff88810230d3a0) [ 14.730576] [ 14.730762] The buggy address belongs to the physical page: [ 14.731263] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10230d [ 14.732091] flags: 0x200000000000000(node=0|zone=2) [ 14.732629] page_type: f5(slab) [ 14.732917] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 14.733252] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 14.733902] page dumped because: kasan: bad access detected [ 14.734091] [ 14.734214] Memory state around the buggy address: [ 14.734695] ffff88810230d280: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 14.734923] ffff88810230d300: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 14.735380] >ffff88810230d380: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 14.735907] ^ [ 14.736136] ffff88810230d400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.736555] ffff88810230d480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.736968] ==================================================================