executing program syzkaller login: [ 18.999689] usercopy: kernel memory overwrite attempt detected to ffff880039f09bd4 (kvm_vcpu) (840 bytes) [ 19.000680] ------------[ cut here ]------------ [ 19.001204] kernel BUG at mm/usercopy.c:84! [ 19.001597] invalid opcode: 0000 [#1] SMP KASAN [ 19.002024] Dumping ftrace buffer: [ 19.002267] (ftrace buffer empty) [ 19.002484] Modules linked in: [ 19.002675] CPU: 1 PID: 3000 Comm: syzkaller021432 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 19.003181] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 19.003791] task: ffff880069b00340 task.stack: ffff8800677b8000 [ 19.004344] RIP: 0010:__check_object_size+0x3a2/0x4f0 [ 19.004807] RSP: 0018:ffff8800677bf148 EFLAGS: 00010286 [ 19.005293] RAX: 000000000000005d RBX: ffffffff8511a0e0 RCX: 0000000000000000 [ 19.005946] RDX: 000000000000005d RSI: 1ffff1000cef7de9 RDI: ffffed000cef7e1d [ 19.006600] RBP: ffff8800677bf238 R08: 0000000000000001 R09: 0000000000000000 [ 19.007261] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8511a0a0 [ 19.008150] R13: ffff880039f09bd4 R14: 0000000000000348 R15: ffffea0000e7c200 [ 19.008882] FS: 00000000010d5880(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000 [ 19.009698] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.010215] CR2: 00007fff9fc79c38 CR3: 000000003df47000 CR4: 00000000000026e0 [ 19.010839] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.011521] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.012300] Call Trace: [ 19.012569] ? lock_release+0xa40/0xa40 [ 19.012939] ? check_stack_object+0x140/0x140 [ 19.013331] ? check_noncircular+0x20/0x20 [ 19.013716] ? __might_sleep+0x95/0x190 [ 19.014122] kvm_vcpu_ioctl_set_cpuid2+0x75/0x1a0 [ 19.014666] kvm_arch_vcpu_ioctl+0x1718/0x4710 [ 19.015130] ? find_held_lock+0x35/0x1d0 [ 19.015522] ? kvm_arch_vcpu_put+0x3e0/0x3e0 [ 19.015914] ? depot_save_stack+0x3b5/0x490 [ 19.016292] ? lock_downgrade+0x990/0x990 [ 19.016656] ? do_raw_spin_trylock+0x190/0x190 [ 19.017110] ? is_bpf_text_address+0xa4/0x120 [ 19.017555] ? kernel_text_address+0x102/0x140 [ 19.018036] ? __kernel_text_address+0xd/0x40 [ 19.018455] ? unwind_get_return_address+0x61/0xa0 [ 19.018926] ? trace_hardirqs_off+0xd/0x10 [ 19.019336] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 19.019795] ? depot_save_stack+0x3b5/0x490 [ 19.020188] ? __vunmap+0x247/0x2e0 [ 19.020505] ? save_stack+0xa3/0xd0 [ 19.020850] ? lock_acquire+0x1d5/0x580 [ 19.021288] ? lock_acquire+0x1d5/0x580 [ 19.021756] ? vcpu_load+0x1c/0x70 [ 19.022082] ? lock_release+0xa40/0xa40 [ 19.022442] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 19.022953] ? rcu_note_context_switch+0x710/0x710 [ 19.023383] ? __might_sleep+0x95/0x190 [ 19.023774] ? vcpu_load+0x1c/0x70 [ 19.024129] ? __mutex_lock+0x16f/0x19d0 [ 19.024533] ? vcpu_load+0x1c/0x70 [ 19.024883] ? vcpu_load+0x1c/0x70 [ 19.025241] ? trace_hardirqs_off+0xd/0x10 [ 19.025665] ? mutex_lock_io_nested+0x1880/0x1880 [ 19.026146] ? find_held_lock+0x35/0x1d0 [ 19.026557] ? __might_fault+0x110/0x1d0 [ 19.026977] ? lock_downgrade+0x990/0x990 [ 19.027341] ? vmx_vcpu_load+0x9c6/0xdd0 [ 19.027727] ? handle_invept+0x5f0/0x5f0 [ 19.028129] ? __might_sleep+0x95/0x190 [ 19.028796] ? kasan_check_read+0x11/0x20 [ 19.029140] ? _copy_to_user+0xa2/0xc0 [ 19.029490] ? kvm_arch_dev_ioctl+0xc7/0x3b0 [ 19.029878] ? kvm_vm_ioctl_check_extension+0x510/0x510 [ 19.030347] ? kvm_arch_vcpu_load+0x1c1/0x890 [ 19.030748] ? kvm_arch_vcpu_load+0x4b1/0x890 [ 19.031178] ? find_held_lock+0x35/0x1d0 [ 19.031537] ? kvm_arch_dev_ioctl+0x3b0/0x3b0 [ 19.031924] ? __hrtick_start+0x1d0/0x1d0 [ 19.032379] ? avc_has_extended_perms+0x6e5/0x12c0 [ 19.032779] ? vcpu_load+0x4b/0x70 [ 19.033103] kvm_vcpu_ioctl+0x240/0x1010 [ 19.033486] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 19.033957] ? is_bpf_text_address+0xa4/0x120 [ 19.034391] ? avc_has_extended_perms+0x7fa/0x12c0 [ 19.034831] ? unwind_get_return_address+0x6e/0xa0 [ 19.035317] ? avc_ss_reset+0x110/0x110 [ 19.035730] ? putname+0xee/0x130 [ 19.036075] ? save_stack+0xa3/0xd0 [ 19.036516] ? save_stack+0x43/0xd0 [ 19.036878] ? kasan_slab_free+0x71/0xc0 [ 19.037281] ? kmem_cache_free+0x77/0x280 [ 19.037696] ? putname+0xee/0x130 [ 19.038041] ? do_sys_open+0x31b/0x6d0 [ 19.038434] ? __lock_is_held+0xb6/0x140 [ 19.038850] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 19.039465] ? rcu_note_context_switch+0x710/0x710 [ 19.039948] ? get_unused_fd_flags+0x190/0x190 [ 19.040405] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 19.040882] do_vfs_ioctl+0x1b1/0x1520 [ 19.041223] ? _cond_resched+0x14/0x30 [ 19.041563] ? ioctl_preallocate+0x2b0/0x2b0 [ 19.041949] ? selinux_capable+0x40/0x40 [ 19.042304] ? putname+0xf3/0x130 [ 19.042652] ? do_sys_open+0x320/0x6d0 [ 19.043050] ? security_file_ioctl+0x89/0xb0 [ 19.043535] SyS_ioctl+0x8f/0xc0 [ 19.043830] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 19.044188] RIP: 0033:0x437f37 [ 19.044433] RSP: 002b:00007fff9fc79c28 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 19.044917] RAX: ffffffffffffffda RBX: 00007fff9fc7a2f0 RCX: 0000000000437f37 [ 19.045348] RDX: 00007fff9fc7a2f0 RSI: 000000004008ae90 RDI: 0000000000000005 [ 19.045799] RBP: 0000000000000082 R08: 0000000000000001 R09: 0000000000000040 [ 19.046231] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 [ 19.046655] R13: 00000000004040b0 R14: 0000000000000004 R15: 0000000000000000 [ 19.047184] 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 [ 19.048830] RIP: __check_object_size+0x3a2/0x4f0 RSP: ffff8800677bf148 [ 19.049383] ---[ end trace 8d594af8fd3991ae ]--- [ 19.050231] Kernel panic - not syncing: Fatal exception [ 19.055502] Dumping ftrace buffer: [ 19.055831] (ftrace buffer empty) [ 19.056110] Kernel Offset: disabled [ 19.056444] Rebooting in 86400 seconds..