executing program syzkaller login: [ 17.264200] usercopy: kernel memory overwrite attempt detected to ffff88006d3e9bd4 (kvm_vcpu) (840 bytes) [ 17.265137] ------------[ cut here ]------------ [ 17.266155] kernel BUG at mm/usercopy.c:84! [ 17.266671] invalid opcode: 0000 [#1] SMP KASAN [ 17.267094] Dumping ftrace buffer: [ 17.267359] (ftrace buffer empty) [ 17.267635] Modules linked in: [ 17.267876] CPU: 0 PID: 2978 Comm: syzkaller414675 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 17.268589] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 17.269153] task: ffff88003d642600 task.stack: ffff88003a328000 [ 17.269566] RIP: 0010:__check_object_size+0x3a2/0x4f0 [ 17.269916] RSP: 0018:ffff88003a32f148 EFLAGS: 00010286 [ 17.270306] RAX: 000000000000005d RBX: ffffffff8511a0e0 RCX: 0000000000000000 [ 17.270798] RDX: 000000000000005d RSI: 1ffff10007465de9 RDI: ffffed0007465e1d [ 17.271326] RBP: ffff88003a32f238 R08: 0000000000000001 R09: 0000000000000000 [ 17.271812] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8511a0a0 [ 17.272375] R13: ffff88006d3e9bd4 R14: 0000000000000348 R15: ffffea0001b4fa00 [ 17.272906] FS: 0000000001829880(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 [ 17.273520] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.273912] CR2: 00005613f41d8008 CR3: 000000006bc25000 CR4: 00000000000026f0 [ 17.274498] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 17.274991] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 17.275769] Call Trace: [ 17.275939] ? lock_release+0xa40/0xa40 [ 17.276207] ? check_stack_object+0x140/0x140 [ 17.276512] ? check_noncircular+0x20/0x20 [ 17.276803] ? __might_sleep+0x95/0x190 [ 17.277088] kvm_vcpu_ioctl_set_cpuid2+0x75/0x1a0 [ 17.277418] kvm_arch_vcpu_ioctl+0x1718/0x4710 [ 17.277729] ? find_held_lock+0x35/0x1d0 [ 17.278027] ? kvm_arch_vcpu_put+0x3e0/0x3e0 [ 17.278331] ? depot_save_stack+0x3b5/0x490 [ 17.278625] ? lock_downgrade+0x990/0x990 [ 17.278984] ? do_raw_spin_trylock+0x190/0x190 [ 17.279349] ? is_bpf_text_address+0xa4/0x120 [ 17.279654] ? kernel_text_address+0x102/0x140 [ 17.279963] ? __kernel_text_address+0xd/0x40 [ 17.280280] ? unwind_get_return_address+0x61/0xa0 [ 17.280614] ? trace_hardirqs_off+0xd/0x10 [ 17.280903] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 17.281259] ? depot_save_stack+0x3b5/0x490 [ 17.281553] ? __vunmap+0x247/0x2e0 [ 17.281797] ? save_stack+0xa3/0xd0 [ 17.282059] ? lock_acquire+0x1d5/0x580 [ 17.282329] ? lock_acquire+0x1d5/0x580 [ 17.282597] ? vcpu_load+0x1c/0x70 [ 17.282839] ? lock_release+0xa40/0xa40 [ 17.283133] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 17.283627] ? rcu_note_context_switch+0x710/0x710 [ 17.283962] ? __might_sleep+0x95/0x190 [ 17.284241] ? vcpu_load+0x1c/0x70 [ 17.284483] ? __mutex_lock+0x16f/0x19d0 [ 17.284757] ? vcpu_load+0x1c/0x70 [ 17.284997] ? vcpu_load+0x1c/0x70 [ 17.285248] ? trace_hardirqs_off+0xd/0x10 [ 17.285536] ? mutex_lock_io_nested+0x1880/0x1880 [ 17.285866] ? find_held_lock+0x35/0x1d0 [ 17.286164] ? __might_fault+0x110/0x1d0 [ 17.286441] ? lock_downgrade+0x990/0x990 [ 17.286726] ? vmx_vcpu_load+0x9c6/0xdd0 [ 17.287004] ? handle_invept+0x5f0/0x5f0 [ 17.287296] ? __might_sleep+0x95/0x190 [ 17.287570] ? kasan_check_read+0x11/0x20 [ 17.287838] ? _copy_to_user+0xa2/0xc0 [ 17.288211] ? kvm_arch_dev_ioctl+0xc7/0x3b0 [ 17.288516] ? kvm_vm_ioctl_check_extension+0x510/0x510 [ 17.288881] ? kvm_arch_vcpu_load+0x1c1/0x890 [ 17.289196] ? kvm_arch_vcpu_load+0x4b1/0x890 [ 17.289501] ? find_held_lock+0x35/0x1d0 [ 17.289777] ? kvm_arch_dev_ioctl+0x3b0/0x3b0 [ 17.290099] ? __hrtick_start+0x1d0/0x1d0 [ 17.290388] ? avc_has_extended_perms+0x6e5/0x12c0 [ 17.290841] ? vcpu_load+0x4b/0x70 [ 17.291196] kvm_vcpu_ioctl+0x240/0x1010 [ 17.291595] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 17.292132] ? is_bpf_text_address+0xa4/0x120 [ 17.292486] ? avc_has_extended_perms+0x7fa/0x12c0 [ 17.292892] ? unwind_get_return_address+0x6e/0xa0 [ 17.293263] ? avc_ss_reset+0x110/0x110 [ 17.293592] ? putname+0xee/0x130 [ 17.293937] ? save_stack+0xa3/0xd0 [ 17.294189] ? save_stack+0x43/0xd0 [ 17.294439] ? kasan_slab_free+0x71/0xc0 [ 17.294716] ? kmem_cache_free+0x77/0x280 [ 17.295003] ? putname+0xee/0x130 [ 17.295246] ? do_sys_open+0x31b/0x6d0 [ 17.295543] ? __lock_is_held+0xb6/0x140 [ 17.295858] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 17.296264] ? rcu_note_context_switch+0x710/0x710 [ 17.296603] ? get_unused_fd_flags+0x190/0x190 [ 17.296925] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 17.297642] do_vfs_ioctl+0x1b1/0x1520 [ 17.297935] ? _cond_resched+0x14/0x30 [ 17.298351] ? ioctl_preallocate+0x2b0/0x2b0 [ 17.298759] ? selinux_capable+0x40/0x40 [ 17.299136] ? putname+0xf3/0x130 [ 17.299458] ? do_sys_open+0x320/0x6d0 [ 17.299786] ? security_file_ioctl+0x89/0xb0 [ 17.300051] SyS_ioctl+0x8f/0xc0 [ 17.300254] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 17.300539] RIP: 0033:0x437f17 [ 17.300728] RSP: 002b:00007ffeb9b2d6c8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 17.301181] RAX: ffffffffffffffda RBX: 00007ffeb9b2dd90 RCX: 0000000000437f17 [ 17.301607] RDX: 00007ffeb9b2dd90 RSI: 000000004008ae90 RDI: 0000000000000005 [ 17.302118] RBP: 0000000000000082 R08: 0000000000000001 R09: 0000000000000040 [ 17.302852] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 [ 17.303440] R13: 0000000000404090 R14: 0000000000000004 R15: 0000000000000000 [ 17.304157] 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 [ 17.306091] RIP: __check_object_size+0x3a2/0x4f0 RSP: ffff88003a32f148 [ 17.306756] ---[ end trace 50d6d76d3992ba1f ]--- [ 17.307208] Kernel panic - not syncing: Fatal exception [ 17.307760] Dumping ftrace buffer: [ 17.308087] (ftrace buffer empty) [ 17.308428] Kernel Offset: disabled [ 17.308816] Rebooting in 86400 seconds..