Date
July 8, 2025, 7:07 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 19.774044] ================================================================== [ 19.774179] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 19.777502] Read of size 4 at addr fff00000c5707d00 by task rcu_preempt/16 [ 19.777570] [ 19.777613] CPU: 1 UID: 0 PID: 16 Comm: rcu_preempt Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 19.777699] Tainted: [B]=BAD_PAGE, [N]=TEST [ 19.777737] Hardware name: linux,dummy-virt (DT) [ 19.777769] Call trace: [ 19.777793] show_stack+0x20/0x38 (C) [ 19.777857] dump_stack_lvl+0x8c/0xd0 [ 19.777917] print_report+0x118/0x608 [ 19.777962] kasan_report+0xdc/0x128 [ 19.778006] __asan_report_load4_noabort+0x20/0x30 [ 19.778204] rcu_uaf_reclaim+0x64/0x70 [ 19.778276] rcu_core+0x9f4/0x1e20 [ 19.778334] rcu_core_si+0x18/0x30 [ 19.778387] handle_softirqs+0x374/0xb28 [ 19.778443] __do_softirq+0x1c/0x28 [ 19.778486] ____do_softirq+0x18/0x30 [ 19.778557] call_on_irq_stack+0x24/0x30 [ 19.778603] do_softirq_own_stack+0x24/0x38 [ 19.778648] __irq_exit_rcu+0x1fc/0x318 [ 19.778692] irq_exit_rcu+0x1c/0x80 [ 19.778744] el1_interrupt+0x38/0x58 [ 19.778967] el1h_64_irq_handler+0x18/0x28 [ 19.779037] el1h_64_irq+0x6c/0x70 [ 19.779404] preempt_count_sub+0x50/0x148 (P) [ 19.779525] _raw_spin_unlock_irq+0x38/0x90 [ 19.779598] rcu_gp_cleanup+0x2a8/0xe28 [ 19.779683] rcu_gp_kthread+0x434/0x590 [ 19.779874] kthread+0x328/0x630 [ 19.779926] ret_from_fork+0x10/0x20 [ 19.780014] [ 19.780079] Allocated by task 198: [ 19.780208] kasan_save_stack+0x3c/0x68 [ 19.780274] kasan_save_track+0x20/0x40 [ 19.780388] kasan_save_alloc_info+0x40/0x58 [ 19.780469] __kasan_kmalloc+0xd4/0xd8 [ 19.780605] __kmalloc_cache_noprof+0x16c/0x3c0 [ 19.780664] rcu_uaf+0xb0/0x2d8 [ 19.780803] kunit_try_run_case+0x170/0x3f0 [ 19.780873] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.780937] kthread+0x328/0x630 [ 19.780971] ret_from_fork+0x10/0x20 [ 19.781269] [ 19.781328] Freed by task 16: [ 19.781385] kasan_save_stack+0x3c/0x68 [ 19.781509] kasan_save_track+0x20/0x40 [ 19.781962] kasan_save_free_info+0x4c/0x78 [ 19.783222] __kasan_slab_free+0x6c/0x98 [ 19.783296] kfree+0x214/0x3c8 [ 19.783340] rcu_uaf_reclaim+0x28/0x70 [ 19.783396] rcu_core+0x9f4/0x1e20 [ 19.783431] rcu_core_si+0x18/0x30 [ 19.783493] handle_softirqs+0x374/0xb28 [ 19.783529] __do_softirq+0x1c/0x28 [ 19.783564] [ 19.783600] Last potentially related work creation: [ 19.783880] kasan_save_stack+0x3c/0x68 [ 19.784003] kasan_record_aux_stack+0xb4/0xc8 [ 19.784062] __call_rcu_common.constprop.0+0x74/0x8c8 [ 19.784108] call_rcu+0x18/0x30 [ 19.784352] rcu_uaf+0x14c/0x2d8 [ 19.784410] kunit_try_run_case+0x170/0x3f0 [ 19.784483] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 19.784529] kthread+0x328/0x630 [ 19.784565] ret_from_fork+0x10/0x20 [ 19.784612] [ 19.784641] The buggy address belongs to the object at fff00000c5707d00 [ 19.784641] which belongs to the cache kmalloc-32 of size 32 [ 19.784702] The buggy address is located 0 bytes inside of [ 19.784702] freed 32-byte region [fff00000c5707d00, fff00000c5707d20) [ 19.784777] [ 19.784799] The buggy address belongs to the physical page: [ 19.784829] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105707 [ 19.784890] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 19.784942] page_type: f5(slab) [ 19.784983] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 19.785033] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 19.785074] page dumped because: kasan: bad access detected [ 19.785110] [ 19.785127] Memory state around the buggy address: [ 19.785163] fff00000c5707c00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 19.785206] fff00000c5707c80: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 19.785249] >fff00000c5707d00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 19.785287] ^ [ 19.785317] fff00000c5707d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.785361] fff00000c5707e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.785441] ==================================================================
[ 13.520195] ================================================================== [ 13.520672] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 13.521915] Read of size 4 at addr ffff88810260e680 by task swapper/1/0 [ 13.523158] [ 13.523620] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 13.523671] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.523684] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.523706] Call Trace: [ 13.523737] <IRQ> [ 13.523756] dump_stack_lvl+0x73/0xb0 [ 13.523790] print_report+0xd1/0x650 [ 13.523813] ? __virt_addr_valid+0x1db/0x2d0 [ 13.523836] ? rcu_uaf_reclaim+0x50/0x60 [ 13.523854] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.523879] ? rcu_uaf_reclaim+0x50/0x60 [ 13.523898] kasan_report+0x141/0x180 [ 13.523919] ? rcu_uaf_reclaim+0x50/0x60 [ 13.523943] __asan_report_load4_noabort+0x18/0x20 [ 13.523965] rcu_uaf_reclaim+0x50/0x60 [ 13.523984] rcu_core+0x66f/0x1c40 [ 13.524013] ? __pfx_rcu_core+0x10/0x10 [ 13.524033] ? ktime_get+0x6b/0x150 [ 13.524068] ? handle_softirqs+0x18e/0x730 [ 13.524093] rcu_core_si+0x12/0x20 [ 13.524114] handle_softirqs+0x209/0x730 [ 13.524132] ? hrtimer_interrupt+0x2fe/0x780 [ 13.524158] ? __pfx_handle_softirqs+0x10/0x10 [ 13.524182] __irq_exit_rcu+0xc9/0x110 [ 13.524201] irq_exit_rcu+0x12/0x20 [ 13.524220] sysvec_apic_timer_interrupt+0x81/0x90 [ 13.524242] </IRQ> [ 13.524270] <TASK> [ 13.524281] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 13.524377] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 13.524635] 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 8a 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 [ 13.524722] RSP: 0000:ffff888100877dc8 EFLAGS: 00010212 [ 13.524810] RAX: ffff8881c8172000 RBX: ffff888100853000 RCX: ffffffff90a730e5 [ 13.524855] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 000000000001334c [ 13.524898] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a [ 13.524940] R10: ffff88815b130c53 R11: 000000000000b400 R12: 0000000000000001 [ 13.524980] R13: ffffed102010a600 R14: ffffffff927b0f90 R15: 0000000000000000 [ 13.525038] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 13.525107] ? default_idle+0xd/0x20 [ 13.525128] arch_cpu_idle+0xd/0x20 [ 13.525148] default_idle_call+0x48/0x80 [ 13.525166] do_idle+0x379/0x4f0 [ 13.525191] ? __pfx_do_idle+0x10/0x10 [ 13.525218] cpu_startup_entry+0x5c/0x70 [ 13.525240] start_secondary+0x211/0x290 [ 13.525261] ? __pfx_start_secondary+0x10/0x10 [ 13.525285] common_startup_64+0x13e/0x148 [ 13.525317] </TASK> [ 13.525329] [ 13.543825] Allocated by task 215: [ 13.544099] kasan_save_stack+0x45/0x70 [ 13.544500] kasan_save_track+0x18/0x40 [ 13.544637] kasan_save_alloc_info+0x3b/0x50 [ 13.544781] __kasan_kmalloc+0xb7/0xc0 [ 13.544908] __kmalloc_cache_noprof+0x189/0x420 [ 13.545136] rcu_uaf+0xb0/0x330 [ 13.545468] kunit_try_run_case+0x1a5/0x480 [ 13.545890] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.546509] kthread+0x337/0x6f0 [ 13.546878] ret_from_fork+0x116/0x1d0 [ 13.547371] ret_from_fork_asm+0x1a/0x30 [ 13.547768] [ 13.547946] Freed by task 0: [ 13.548275] kasan_save_stack+0x45/0x70 [ 13.548700] kasan_save_track+0x18/0x40 [ 13.549109] kasan_save_free_info+0x3f/0x60 [ 13.549468] __kasan_slab_free+0x56/0x70 [ 13.549642] kfree+0x222/0x3f0 [ 13.549967] rcu_uaf_reclaim+0x1f/0x60 [ 13.550386] rcu_core+0x66f/0x1c40 [ 13.550785] rcu_core_si+0x12/0x20 [ 13.551070] handle_softirqs+0x209/0x730 [ 13.551489] __irq_exit_rcu+0xc9/0x110 [ 13.551675] irq_exit_rcu+0x12/0x20 [ 13.551799] sysvec_apic_timer_interrupt+0x81/0x90 [ 13.551955] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 13.552206] [ 13.552395] Last potentially related work creation: [ 13.552820] kasan_save_stack+0x45/0x70 [ 13.553240] kasan_record_aux_stack+0xb2/0xc0 [ 13.553672] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 13.554193] call_rcu+0x12/0x20 [ 13.554497] rcu_uaf+0x168/0x330 [ 13.554857] kunit_try_run_case+0x1a5/0x480 [ 13.555310] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.555745] kthread+0x337/0x6f0 [ 13.555862] ret_from_fork+0x116/0x1d0 [ 13.555989] ret_from_fork_asm+0x1a/0x30 [ 13.556375] [ 13.556548] The buggy address belongs to the object at ffff88810260e680 [ 13.556548] which belongs to the cache kmalloc-32 of size 32 [ 13.557831] The buggy address is located 0 bytes inside of [ 13.557831] freed 32-byte region [ffff88810260e680, ffff88810260e6a0) [ 13.558680] [ 13.558760] The buggy address belongs to the physical page: [ 13.558929] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10260e [ 13.559446] flags: 0x200000000000000(node=0|zone=2) [ 13.559887] page_type: f5(slab) [ 13.560214] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 13.560997] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 13.561776] page dumped because: kasan: bad access detected [ 13.562348] [ 13.562421] Memory state around the buggy address: [ 13.562691] ffff88810260e580: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 13.563431] ffff88810260e600: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 13.563987] >ffff88810260e680: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 13.564583] ^ [ 13.564876] ffff88810260e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.565343] ffff88810260e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.565627] ==================================================================