Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.242' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.611058][ T7052] 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. [ 64.670076][ T7052] ================================================================== [ 64.678226][ T7052] BUG: KASAN: slab-out-of-bounds in __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.686871][ T7052] Read of size 8 at addr ffff8880974b0468 by task syz-executor850/7052 [ 64.695088][ T7052] [ 64.697399][ T7052] CPU: 1 PID: 7052 Comm: syz-executor850 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 64.707254][ T7052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.717281][ T7052] Call Trace: [ 64.720562][ T7052] dump_stack+0x188/0x20d [ 64.724889][ T7052] print_address_description.constprop.0.cold+0xd3/0x315 [ 64.731886][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.737839][ T7052] __kasan_report.cold+0x35/0x4d [ 64.742753][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.748708][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.754672][ T7052] kasan_report+0x33/0x50 [ 64.759054][ T7052] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.764880][ T7052] ? __kvm_write_guest_page+0x170/0x170 [ 64.770417][ T7052] kvm_lapic_set_vapic_addr+0x88/0x180 [ 64.775870][ T7052] kvm_arch_vcpu_ioctl+0xf0d/0x2c00 [ 64.781233][ T7052] ? kvm_arch_vcpu_put+0x530/0x530 [ 64.786324][ T7052] ? lock_acquire+0x1f2/0x8f0 [ 64.790981][ T7052] ? kvm_vcpu_ioctl+0x175/0xe60 [ 64.795823][ T7052] ? lock_release+0x800/0x800 [ 64.800476][ T7052] ? find_held_lock+0x2d/0x110 [ 64.805221][ T7052] ? __mutex_lock+0x458/0x13c0 [ 64.809957][ T7052] ? kfree+0x1eb/0x2b0 [ 64.814024][ T7052] ? kvm_vcpu_ioctl+0x175/0xe60 [ 64.818861][ T7052] ? mutex_trylock+0x2c0/0x2c0 [ 64.823604][ T7052] ? tomoyo_execute_permission+0x470/0x470 [ 64.829405][ T7052] kvm_vcpu_ioctl+0x866/0xe60 [ 64.834106][ T7052] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 64.840501][ T7052] ? ioctl_file_clone+0x180/0x180 [ 64.845511][ T7052] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.851164][ T7052] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.857250][ T7052] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 64.863644][ T7052] ksys_ioctl+0x11a/0x180 [ 64.867962][ T7052] __x64_sys_ioctl+0x6f/0xb0 [ 64.872547][ T7052] ? lockdep_hardirqs_on+0x463/0x620 [ 64.877808][ T7052] do_syscall_64+0xf6/0x7d0 [ 64.882378][ T7052] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 64.888252][ T7052] RIP: 0033:0x440219 [ 64.892124][ T7052] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 64.911712][ T7052] RSP: 002b:00007ffc49047778 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 64.920119][ T7052] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 64.928102][ T7052] RDX: 0000000020000080 RSI: 000000004008ae93 RDI: 0000000000000005 [ 64.936097][ T7052] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 64.944048][ T7052] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401aa0 [ 64.952020][ T7052] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 64.960027][ T7052] [ 64.962338][ T7052] Allocated by task 7052: [ 64.966652][ T7052] save_stack+0x1b/0x40 [ 64.970819][ T7052] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.976458][ T7052] kvmalloc_node+0x61/0xf0 [ 64.980855][ T7052] kvm_set_memslot+0x115/0x1530 [ 64.985681][ T7052] __kvm_set_memory_region+0xcf7/0x1320 [ 64.991221][ T7052] __x86_set_memory_region+0x2a3/0x5a0 [ 64.996710][ T7052] vmx_create_vcpu+0x2107/0x2b40 [ 65.001626][ T7052] kvm_arch_vcpu_create+0x6ef/0xb80 [ 65.006801][ T7052] kvm_vm_ioctl+0x1614/0x2400 [ 65.011470][ T7052] ksys_ioctl+0x11a/0x180 [ 65.015862][ T7052] __x64_sys_ioctl+0x6f/0xb0 [ 65.020429][ T7052] do_syscall_64+0xf6/0x7d0 [ 65.024909][ T7052] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 65.030770][ T7052] [ 65.033077][ T7052] Freed by task 16: [ 65.036878][ T7052] save_stack+0x1b/0x40 [ 65.041027][ T7052] __kasan_slab_free+0xf7/0x140 [ 65.045866][ T7052] kfree+0x109/0x2b0 [ 65.049760][ T7052] __sk_destruct+0x5ad/0x7c0 [ 65.054324][ T7052] sk_destruct+0xc6/0x100 [ 65.058625][ T7052] __sk_free+0xef/0x3d0 [ 65.062757][ T7052] sk_free+0x78/0xa0 [ 65.066645][ T7052] deferred_put_nlk_sk+0x151/0x2e0 [ 65.071747][ T7052] rcu_core+0x59f/0x1370 [ 65.075966][ T7052] __do_softirq+0x26c/0x9f7 [ 65.080437][ T7052] [ 65.082744][ T7052] The buggy address belongs to the object at ffff8880974b0000 [ 65.082744][ T7052] which belongs to the cache kmalloc-2k of size 2048 [ 65.096768][ T7052] The buggy address is located 1128 bytes inside of [ 65.096768][ T7052] 2048-byte region [ffff8880974b0000, ffff8880974b0800) [ 65.111676][ T7052] The buggy address belongs to the page: [ 65.117284][ T7052] page:ffffea00025d2c00 refcount:1 mapcount:0 mapping:000000001c3dad62 index:0x0 [ 65.126364][ T7052] flags: 0xfffe0000000200(slab) [ 65.131213][ T7052] raw: 00fffe0000000200 ffffea000256a6c8 ffffea00025d2208 ffff8880aa000e00 [ 65.139775][ T7052] raw: 0000000000000000 ffff8880974b0000 0000000100000001 0000000000000000 [ 65.148326][ T7052] page dumped because: kasan: bad access detected [ 65.154707][ T7052] [ 65.157008][ T7052] Memory state around the buggy address: [ 65.162699][ T7052] ffff8880974b0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 65.170755][ T7052] ffff8880974b0380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 65.178799][ T7052] >ffff8880974b0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc [ 65.186830][ T7052] ^ [ 65.194345][ T7052] ffff8880974b0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 65.202383][ T7052] ffff8880974b0500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 65.210416][ T7052] ================================================================== [ 65.221576][ T7052] Disabling lock debugging due to kernel taint [ 65.230158][ T7052] Kernel panic - not syncing: panic_on_warn set ... [ 65.236755][ T7052] CPU: 0 PID: 7052 Comm: syz-executor850 Tainted: G B 5.7.0-rc1-next-20200415-syzkaller #0 [ 65.248030][ T7052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.258074][ T7052] Call Trace: [ 65.261345][ T7052] dump_stack+0x188/0x20d [ 65.265668][ T7052] panic+0x2e3/0x75c [ 65.269542][ T7052] ? add_taint.cold+0x16/0x16 [ 65.274215][ T7052] ? preempt_schedule_common+0x5e/0xc0 [ 65.279679][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 65.285637][ T7052] ? preempt_schedule_thunk+0x16/0x18 [ 65.290983][ T7052] ? trace_hardirqs_on+0x55/0x220 [ 65.295983][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 65.301938][ T7052] end_report+0x4d/0x53 [ 65.306069][ T7052] __kasan_report.cold+0xd/0x4d [ 65.310895][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 65.316867][ T7052] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 65.322819][ T7052] kasan_report+0x33/0x50 [ 65.327125][ T7052] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 65.332908][ T7052] ? __kvm_write_guest_page+0x170/0x170 [ 65.338429][ T7052] kvm_lapic_set_vapic_addr+0x88/0x180 [ 65.343883][ T7052] kvm_arch_vcpu_ioctl+0xf0d/0x2c00 [ 65.349058][ T7052] ? kvm_arch_vcpu_put+0x530/0x530 [ 65.354145][ T7052] ? lock_acquire+0x1f2/0x8f0 [ 65.358797][ T7052] ? kvm_vcpu_ioctl+0x175/0xe60 [ 65.363621][ T7052] ? lock_release+0x800/0x800 [ 65.368270][ T7052] ? find_held_lock+0x2d/0x110 [ 65.373031][ T7052] ? __mutex_lock+0x458/0x13c0 [ 65.377785][ T7052] ? kfree+0x1eb/0x2b0 [ 65.381828][ T7052] ? kvm_vcpu_ioctl+0x175/0xe60 [ 65.386651][ T7052] ? mutex_trylock+0x2c0/0x2c0 [ 65.391388][ T7052] ? tomoyo_execute_permission+0x470/0x470 [ 65.397177][ T7052] kvm_vcpu_ioctl+0x866/0xe60 [ 65.401850][ T7052] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 65.408237][ T7052] ? ioctl_file_clone+0x180/0x180 [ 65.413240][ T7052] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.418759][ T7052] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.424714][ T7052] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 65.431121][ T7052] ksys_ioctl+0x11a/0x180 [ 65.435426][ T7052] __x64_sys_ioctl+0x6f/0xb0 [ 65.440009][ T7052] ? lockdep_hardirqs_on+0x463/0x620 [ 65.445284][ T7052] do_syscall_64+0xf6/0x7d0 [ 65.449777][ T7052] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 65.455644][ T7052] RIP: 0033:0x440219 [ 65.459514][ T7052] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 65.479098][ T7052] RSP: 002b:00007ffc49047778 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 65.487487][ T7052] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 65.495451][ T7052] RDX: 0000000020000080 RSI: 000000004008ae93 RDI: 0000000000000005 [ 65.503427][ T7052] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 65.511381][ T7052] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401aa0 [ 65.519343][ T7052] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 65.528615][ T7052] Kernel Offset: disabled [ 65.532951][ T7052] Rebooting in 86400 seconds..