executing program syzkaller login: [ 17.105604] usercopy: kernel memory overwrite attempt detected to ffff880039079bd4 (kvm_vcpu) (840 bytes) [ 17.106420] ------------[ cut here ]------------ [ 17.106763] kernel BUG at mm/usercopy.c:84! [ 17.107366] invalid opcode: 0000 [#1] SMP KASAN [ 17.107879] Dumping ftrace buffer: [ 17.108210] (ftrace buffer empty) [ 17.108559] Modules linked in: [ 17.108866] CPU: 1 PID: 2971 Comm: syzkaller216509 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 17.109678] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 17.110431] task: ffff880069c1e140 task.stack: ffff880068040000 [ 17.110965] RIP: 0010:__check_object_size+0x3a2/0x4f0 [ 17.111276] RSP: 0018:ffff880068047148 EFLAGS: 00010286 [ 17.111598] RAX: 000000000000005d RBX: ffffffff8511a0e0 RCX: 0000000000000000 [ 17.112226] RDX: 000000000000005d RSI: 1ffff1000d008de9 RDI: ffffed000d008e1d [ 17.112892] RBP: ffff880068047238 R08: 0000000000000001 R09: 0000000000000000 [ 17.113615] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8511a0a0 [ 17.114307] R13: ffff880039079bd4 R14: 0000000000000348 R15: ffffea0000e41e00 [ 17.114925] FS: 0000000001f34880(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000 [ 17.115587] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.116048] CR2: 0000000020b70000 CR3: 000000003d4b0000 CR4: 00000000000026e0 [ 17.116677] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 17.117329] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 17.117856] Call Trace: [ 17.118069] ? lock_release+0xa40/0xa40 [ 17.118356] ? check_stack_object+0x140/0x140 [ 17.118679] ? check_noncircular+0x20/0x20 [ 17.119003] ? __might_sleep+0x95/0x190 [ 17.119365] kvm_vcpu_ioctl_set_cpuid2+0x75/0x1a0 [ 17.119803] kvm_arch_vcpu_ioctl+0x1718/0x4710 [ 17.120148] ? find_held_lock+0x35/0x1d0 [ 17.120431] ? kvm_arch_vcpu_put+0x3e0/0x3e0 [ 17.120793] ? depot_save_stack+0x3b5/0x490 [ 17.121222] ? lock_downgrade+0x990/0x990 [ 17.121638] ? do_raw_spin_trylock+0x190/0x190 [ 17.122080] ? is_bpf_text_address+0xa4/0x120 [ 17.122860] ? kernel_text_address+0x102/0x140 [ 17.123247] ? __kernel_text_address+0xd/0x40 [ 17.123575] ? unwind_get_return_address+0x61/0xa0 [ 17.124037] ? trace_hardirqs_off+0xd/0x10 [ 17.124451] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 17.124872] ? depot_save_stack+0x3b5/0x490 [ 17.125277] ? __vunmap+0x247/0x2e0 [ 17.125637] ? save_stack+0xa3/0xd0 [ 17.126001] ? lock_acquire+0x1d5/0x580 [ 17.126386] ? lock_acquire+0x1d5/0x580 [ 17.126781] ? vcpu_load+0x1c/0x70 [ 17.127156] ? lock_release+0xa40/0xa40 [ 17.127553] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 17.128116] ? rcu_note_context_switch+0x710/0x710 [ 17.128517] ? __might_sleep+0x95/0x190 [ 17.128767] ? vcpu_load+0x1c/0x70 [ 17.128992] ? __mutex_lock+0x16f/0x19d0 [ 17.129319] ? vcpu_load+0x1c/0x70 [ 17.129612] ? vcpu_load+0x1c/0x70 [ 17.129864] ? trace_hardirqs_off+0xd/0x10 [ 17.130145] ? mutex_lock_io_nested+0x1880/0x1880 [ 17.130456] ? find_held_lock+0x35/0x1d0 [ 17.130719] ? __might_fault+0x110/0x1d0 [ 17.130981] ? lock_downgrade+0x990/0x990 [ 17.131249] ? vmx_vcpu_load+0x9c6/0xdd0 [ 17.131512] ? handle_invept+0x5f0/0x5f0 [ 17.131786] ? __might_sleep+0x95/0x190 [ 17.132044] ? kasan_check_read+0x11/0x20 [ 17.132317] ? _copy_to_user+0xa2/0xc0 [ 17.132568] ? kvm_arch_dev_ioctl+0xc7/0x3b0 [ 17.132845] ? kvm_vm_ioctl_check_extension+0x510/0x510 [ 17.133234] ? kvm_arch_vcpu_load+0x1c1/0x890 [ 17.133520] ? kvm_arch_vcpu_load+0x4b1/0x890 [ 17.133818] ? find_held_lock+0x35/0x1d0 [ 17.134078] ? kvm_arch_dev_ioctl+0x3b0/0x3b0 [ 17.134365] ? __hrtick_start+0x1d0/0x1d0 [ 17.134631] ? avc_has_extended_perms+0x6e5/0x12c0 [ 17.134945] ? vcpu_load+0x4b/0x70 [ 17.135180] kvm_vcpu_ioctl+0x240/0x1010 [ 17.135445] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 17.135804] ? is_bpf_text_address+0xa4/0x120 [ 17.136160] ? avc_has_extended_perms+0x7fa/0x12c0 [ 17.136486] ? unwind_get_return_address+0x6e/0xa0 [ 17.136796] ? avc_ss_reset+0x110/0x110 [ 17.137055] ? putname+0xee/0x130 [ 17.137320] ? save_stack+0xa3/0xd0 [ 17.137558] ? save_stack+0x43/0xd0 [ 17.137793] ? kasan_slab_free+0x71/0xc0 [ 17.138054] ? kmem_cache_free+0x77/0x280 [ 17.138319] ? putname+0xee/0x130 [ 17.138544] ? do_sys_open+0x31b/0x6d0 [ 17.138801] ? __lock_is_held+0xb6/0x140 [ 17.139137] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 17.139603] ? rcu_note_context_switch+0x710/0x710 [ 17.139968] ? get_unused_fd_flags+0x190/0x190 [ 17.140258] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 17.140597] do_vfs_ioctl+0x1b1/0x1520 [ 17.140845] ? _cond_resched+0x14/0x30 [ 17.141143] ? ioctl_preallocate+0x2b0/0x2b0 [ 17.141433] ? selinux_capable+0x40/0x40 [ 17.141700] ? putname+0xf3/0x130 [ 17.141936] ? do_sys_open+0x320/0x6d0 [ 17.142200] ? security_file_ioctl+0x89/0xb0 [ 17.142490] SyS_ioctl+0x8f/0xc0 [ 17.142721] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 17.143038] RIP: 0033:0x437f37 [ 17.143234] RSP: 002b:00007ffe36a97028 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 17.143706] RAX: ffffffffffffffda RBX: 00007ffe36a976f0 RCX: 0000000000437f37 [ 17.144178] RDX: 00007ffe36a976f0 RSI: 000000004008ae90 RDI: 0000000000000005 [ 17.144935] RBP: 0000000000000082 R08: 0000000000000001 R09: 0000000000000014 [ 17.145401] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 [ 17.145866] R13: 00000000004040b0 R14: 0000000000404140 R15: 0000000000000000 [ 17.146336] Code: 48 0f 44 da e8 70 f0 c3 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 a0 a1 11 85 49 89 c0 e8 c3 fb ad ff <0f> 0b 48 c7 c0 60 9f 11 85 eb 96 48 c7 c0 a0 9f 11 85 eb 8d 48 [ 17.147601] RIP: __check_object_size+0x3a2/0x4f0 RSP: ffff880068047148 [ 17.148063] ---[ end trace c2161fd47d4a82ae ]--- [ 17.148384] Kernel panic - not syncing: Fatal exception [ 17.148805] Dumping ftrace buffer: [ 17.149018] (ftrace buffer empty) [ 17.149354] Kernel Offset: disabled [ 17.149688] Rebooting in 86400 seconds..