[ OK ] Started Getty on tty1. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.1' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.921852][ T7033] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. [ 59.958643][ T7033] ================================================================== [ 59.966884][ T7033] BUG: KASAN: slab-out-of-bounds in kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 59.975211][ T7033] Read of size 8 at addr ffff8880a9663468 by task syz-executor211/7033 [ 59.983437][ T7033] [ 59.985779][ T7033] CPU: 0 PID: 7033 Comm: syz-executor211 Not tainted 5.6.0-syzkaller #0 [ 59.994175][ T7033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.004223][ T7033] Call Trace: [ 60.007524][ T7033] dump_stack+0x188/0x20d [ 60.011843][ T7033] print_address_description.constprop.0.cold+0xd3/0x315 [ 60.018849][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.024462][ T7033] __kasan_report.cold+0x35/0x4d [ 60.029391][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.035031][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.040655][ T7033] kasan_report+0x33/0x50 [ 60.045011][ T7033] kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.050535][ T7033] try_async_pf+0x12b/0xac0 [ 60.055050][ T7033] ? ept_gva_to_gpa+0x1e0/0x1e0 [ 60.059950][ T7033] ? mark_held_locks+0x9f/0xe0 [ 60.064721][ T7033] ? mmu_topup_memory_caches+0x325/0x460 [ 60.070365][ T7033] direct_page_fault+0x27d/0x1d70 [ 60.075396][ T7033] ? kvm_mmu_get_page+0x1e70/0x1e70 [ 60.080582][ T7033] ? kvm_mtrr_check_gfn_range_consistency+0x254/0x2e0 [ 60.087329][ T7033] ? kvm_vcpu_mtrr_init+0x70/0x70 [ 60.092360][ T7033] kvm_mmu_page_fault+0x187/0x15d0 [ 60.097456][ T7033] ? find_held_lock+0x2d/0x110 [ 60.102200][ T7033] ? kvm_nx_lpage_recovery_worker+0x790/0x790 [ 60.108249][ T7033] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.113772][ T7033] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.119733][ T7033] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.125811][ T7033] ? handle_ept_violation+0x206/0x550 [ 60.131262][ T7033] ? vmx_inject_irq+0x5b0/0x5b0 [ 60.136098][ T7033] vmx_handle_exit+0x2b8/0x1700 [ 60.141197][ T7033] vcpu_enter_guest+0xfea/0x59d0 [ 60.146156][ T7033] ? kvm_vcpu_reload_apic_access_page+0x300/0x300 [ 60.152579][ T7033] ? kvm_arch_vcpu_ioctl_run+0x23a/0x16a0 [ 60.158297][ T7033] ? lock_release+0x800/0x800 [ 60.162967][ T7033] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.168494][ T7033] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.174468][ T7033] ? kvm_check_async_pf_completion+0x2a4/0x400 [ 60.180613][ T7033] ? lockdep_hardirqs_on+0x463/0x620 [ 60.185900][ T7033] ? kvm_arch_vcpu_ioctl_run+0x3fb/0x16a0 [ 60.191606][ T7033] kvm_arch_vcpu_ioctl_run+0x3fb/0x16a0 [ 60.197160][ T7033] kvm_vcpu_ioctl+0x493/0xe60 [ 60.201835][ T7033] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 60.208248][ T7033] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 60.214127][ T7033] ? do_vfs_ioctl+0x50c/0x12d0 [ 60.218901][ T7033] ? ioctl_file_clone+0x180/0x180 [ 60.224875][ T7033] kvm_vcpu_compat_ioctl+0x1ab/0x350 [ 60.230148][ T7033] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.236111][ T7033] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 60.241749][ T7033] ? do_sys_open+0xc3/0x140 [ 60.246258][ T7033] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 60.251104][ T7033] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 60.256553][ T7033] do_fast_syscall_32+0x270/0xe90 [ 60.261749][ T7033] entry_SYSENTER_compat+0x70/0x7f [ 60.271737][ T7033] [ 60.274062][ T7033] Allocated by task 7033: [ 60.278442][ T7033] save_stack+0x1b/0x40 [ 60.282712][ T7033] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 60.288376][ T7033] kvmalloc_node+0x61/0xf0 [ 60.292794][ T7033] kvm_set_memslot+0x115/0x1530 [ 60.297636][ T7033] __kvm_set_memory_region+0xcf7/0x1320 [ 60.303161][ T7033] __x86_set_memory_region+0x2a3/0x5a0 [ 60.308674][ T7033] vmx_create_vcpu+0x2107/0x2b40 [ 60.313620][ T7033] kvm_arch_vcpu_create+0x6ef/0xb80 [ 60.318874][ T7033] kvm_vm_ioctl+0x15f7/0x23e0 [ 60.323543][ T7033] kvm_vm_compat_ioctl+0x125/0x240 [ 60.328693][ T7033] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 60.334302][ T7033] do_fast_syscall_32+0x270/0xe90 [ 60.339325][ T7033] entry_SYSENTER_compat+0x70/0x7f [ 60.344417][ T7033] [ 60.346726][ T7033] Freed by task 9: [ 60.350433][ T7033] save_stack+0x1b/0x40 [ 60.354567][ T7033] __kasan_slab_free+0xf7/0x140 [ 60.359404][ T7033] kfree+0x109/0x2b0 [ 60.363280][ T7033] __sk_destruct+0x5ad/0x7c0 [ 60.367992][ T7033] sk_destruct+0xc6/0x100 [ 60.372294][ T7033] __sk_free+0xef/0x3d0 [ 60.376433][ T7033] sk_free+0x78/0xa0 [ 60.380318][ T7033] deferred_put_nlk_sk+0x151/0x2e0 [ 60.385408][ T7033] rcu_core+0x59f/0x1370 [ 60.389630][ T7033] __do_softirq+0x26c/0x9f7 [ 60.394381][ T7033] [ 60.396714][ T7033] The buggy address belongs to the object at ffff8880a9663000 [ 60.396714][ T7033] which belongs to the cache kmalloc-2k of size 2048 [ 60.410910][ T7033] The buggy address is located 1128 bytes inside of [ 60.410910][ T7033] 2048-byte region [ffff8880a9663000, ffff8880a9663800) [ 60.425145][ T7033] The buggy address belongs to the page: [ 60.430766][ T7033] page:ffffea0002a598c0 refcount:1 mapcount:0 mapping:000000006890a93d index:0x0 [ 60.439857][ T7033] flags: 0xfffe0000000200(slab) [ 60.444697][ T7033] raw: 00fffe0000000200 ffffea0002a59888 ffffea0002a59988 ffff8880aa000e00 [ 60.453413][ T7033] raw: 0000000000000000 ffff8880a9663000 0000000100000001 0000000000000000 [ 60.462327][ T7033] page dumped because: kasan: bad access detected [ 60.468776][ T7033] [ 60.471084][ T7033] Memory state around the buggy address: [ 60.476706][ T7033] ffff8880a9663300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 60.484756][ T7033] ffff8880a9663380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 60.492809][ T7033] >ffff8880a9663400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc [ 60.500848][ T7033] ^ [ 60.508292][ T7033] ffff8880a9663480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 60.516339][ T7033] ffff8880a9663500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 60.524374][ T7033] ================================================================== [ 60.532408][ T7033] Disabling lock debugging due to kernel taint [ 60.538920][ T7033] Kernel panic - not syncing: panic_on_warn set ... [ 60.545625][ T7033] CPU: 0 PID: 7033 Comm: syz-executor211 Tainted: G B 5.6.0-syzkaller #0 [ 60.555333][ T7033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.565387][ T7033] Call Trace: [ 60.568706][ T7033] dump_stack+0x188/0x20d [ 60.574167][ T7033] panic+0x2e3/0x75c [ 60.578048][ T7033] ? add_taint.cold+0x16/0x16 [ 60.582988][ T7033] ? preempt_schedule_common+0x5e/0xc0 [ 60.589945][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.595580][ T7033] ? preempt_schedule_thunk+0x16/0x18 [ 60.600981][ T7033] ? trace_hardirqs_on+0x55/0x220 [ 60.606515][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.612248][ T7033] end_report+0x4d/0x53 [ 60.616393][ T7033] __kasan_report.cold+0xd/0x4d [ 60.621246][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.627021][ T7033] ? kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.632996][ T7033] kasan_report+0x33/0x50 [ 60.637625][ T7033] kvm_vcpu_gfn_to_memslot+0x50e/0x540 [ 60.643349][ T7033] try_async_pf+0x12b/0xac0 [ 60.647978][ T7033] ? ept_gva_to_gpa+0x1e0/0x1e0 [ 60.652841][ T7033] ? mark_held_locks+0x9f/0xe0 [ 60.657601][ T7033] ? mmu_topup_memory_caches+0x325/0x460 [ 60.663346][ T7033] direct_page_fault+0x27d/0x1d70 [ 60.668988][ T7033] ? kvm_mmu_get_page+0x1e70/0x1e70 [ 60.674186][ T7033] ? kvm_mtrr_check_gfn_range_consistency+0x254/0x2e0 [ 60.681194][ T7033] ? kvm_vcpu_mtrr_init+0x70/0x70 [ 60.686217][ T7033] kvm_mmu_page_fault+0x187/0x15d0 [ 60.691447][ T7033] ? find_held_lock+0x2d/0x110 [ 60.696363][ T7033] ? kvm_nx_lpage_recovery_worker+0x790/0x790 [ 60.702518][ T7033] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.708051][ T7033] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.714186][ T7033] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.720256][ T7033] ? handle_ept_violation+0x206/0x550 [ 60.725726][ T7033] ? vmx_inject_irq+0x5b0/0x5b0 [ 60.730565][ T7033] vmx_handle_exit+0x2b8/0x1700 [ 60.735408][ T7033] vcpu_enter_guest+0xfea/0x59d0 [ 60.740352][ T7033] ? kvm_vcpu_reload_apic_access_page+0x300/0x300 [ 60.746750][ T7033] ? kvm_arch_vcpu_ioctl_run+0x23a/0x16a0 [ 60.752456][ T7033] ? lock_release+0x800/0x800 [ 60.757235][ T7033] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.762788][ T7033] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.768785][ T7033] ? kvm_check_async_pf_completion+0x2a4/0x400 [ 60.774947][ T7033] ? lockdep_hardirqs_on+0x463/0x620 [ 60.780346][ T7033] ? kvm_arch_vcpu_ioctl_run+0x3fb/0x16a0 [ 60.786498][ T7033] kvm_arch_vcpu_ioctl_run+0x3fb/0x16a0 [ 60.792092][ T7033] kvm_vcpu_ioctl+0x493/0xe60 [ 60.796759][ T7033] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 60.803267][ T7033] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 60.809138][ T7033] ? do_vfs_ioctl+0x50c/0x12d0 [ 60.813907][ T7033] ? ioctl_file_clone+0x180/0x180 [ 60.819542][ T7033] kvm_vcpu_compat_ioctl+0x1ab/0x350 [ 60.824823][ T7033] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.830791][ T7033] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 60.835637][ T7033] ? do_sys_open+0xc3/0x140 [ 60.840128][ T7033] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 60.844970][ T7033] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 60.850426][ T7033] do_fast_syscall_32+0x270/0xe90 [ 60.855534][ T7033] entry_SYSENTER_compat+0x70/0x7f [ 60.862138][ T7033] Kernel Offset: disabled [ 60.866462][ T7033] Rebooting in 86400 seconds..