Debian GNU/Linux 7 syzkaller ttyS0 executing program syzkaller login: [ 15.810667] usercopy: kernel memory overwrite attempt detected to ffff880067741bd4 (kvm_vcpu) (840 bytes) [ 15.811610] ------------[ cut here ]------------ [ 15.812090] kernel BUG at mm/usercopy.c:84! [ 15.812485] invalid opcode: 0000 [#1] SMP KASAN [ 15.812900] Dumping ftrace buffer: [ 15.813222] (ftrace buffer empty) [ 15.813552] Modules linked in: [ 15.813843] CPU: 3 PID: 2978 Comm: syzkaller585728 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 15.814857] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 15.815626] task: ffff88003a7ba2c0 task.stack: ffff88003d470000 [ 15.816200] RIP: 0010:__check_object_size+0x3a2/0x4f0 [ 15.816579] RSP: 0018:ffff88003d477148 EFLAGS: 00010286 [ 15.816931] RAX: 000000000000005d RBX: ffffffff8511a0e0 RCX: 0000000000000000 [ 15.817391] RDX: 000000000000005d RSI: 1ffff10007a8ede9 RDI: ffffed0007a8ee1d [ 15.817836] RBP: ffff88003d477238 R08: 0000000000000001 R09: 0000000000000000 [ 15.818281] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8511a0a0 [ 15.818784] R13: ffff880067741bd4 R14: 0000000000000348 R15: ffffea00019dd000 [ 15.819266] FS: 0000000001d09880(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000 [ 15.819787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 15.820185] CR2: 00007ffd49e15f28 CR3: 000000006ba1c000 CR4: 00000000000026e0 [ 15.820758] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 15.821314] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 15.821848] Call Trace: [ 15.822061] ? lock_release+0xa40/0xa40 [ 15.822371] ? check_stack_object+0x140/0x140 [ 15.822757] ? check_noncircular+0x20/0x20 [ 15.823047] ? __might_sleep+0x95/0x190 [ 15.823301] kvm_vcpu_ioctl_set_cpuid2+0x75/0x1a0 [ 15.823609] kvm_arch_vcpu_ioctl+0x1718/0x4710 [ 15.823881] ? find_held_lock+0x35/0x1d0 [ 15.824139] ? kvm_arch_vcpu_put+0x3e0/0x3e0 [ 15.824435] ? depot_save_stack+0x3b5/0x490 [ 15.824777] ? lock_downgrade+0x990/0x990 [ 15.825143] ? do_raw_spin_trylock+0x190/0x190 [ 15.825452] ? is_bpf_text_address+0xa4/0x120 [ 15.825767] ? kernel_text_address+0x102/0x140 [ 15.826112] ? __kernel_text_address+0xd/0x40 [ 15.826466] ? unwind_get_return_address+0x61/0xa0 [ 15.826778] ? trace_hardirqs_off+0xd/0x10 [ 15.827126] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 15.827573] ? depot_save_stack+0x3b5/0x490 [ 15.827840] ? __vunmap+0x247/0x2e0 [ 15.828070] ? save_stack+0xa3/0xd0 [ 15.828331] ? lock_acquire+0x1d5/0x580 [ 15.828658] ? lock_acquire+0x1d5/0x580 [ 15.828956] ? vcpu_load+0x1c/0x70 [ 15.829193] ? lock_release+0xa40/0xa40 [ 15.829500] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 15.829962] ? rcu_note_context_switch+0x710/0x710 [ 15.830339] ? __might_sleep+0x95/0x190 [ 15.830650] ? vcpu_load+0x1c/0x70 [ 15.830898] ? __mutex_lock+0x16f/0x19d0 [ 15.831202] ? vcpu_load+0x1c/0x70 [ 15.831495] ? vcpu_load+0x1c/0x70 [ 15.831819] ? trace_hardirqs_off+0xd/0x10 [ 15.832215] ? mutex_lock_io_nested+0x1880/0x1880 [ 15.832652] ? find_held_lock+0x35/0x1d0 [ 15.833075] ? __might_fault+0x110/0x1d0 [ 15.833427] ? lock_downgrade+0x990/0x990 [ 15.833754] ? vmx_vcpu_load+0x9c6/0xdd0 [ 15.834076] ? handle_invept+0x5f0/0x5f0 [ 15.834395] ? __might_sleep+0x95/0x190 [ 15.834705] ? kasan_check_read+0x11/0x20 [ 15.834995] ? _copy_to_user+0xa2/0xc0 [ 15.835309] ? kvm_arch_dev_ioctl+0xc7/0x3b0 [ 15.835736] ? kvm_vm_ioctl_check_extension+0x510/0x510 [ 15.836281] ? kvm_arch_vcpu_load+0x1c1/0x890 [ 15.836978] ? kvm_arch_vcpu_load+0x4b1/0x890 [ 15.837390] ? find_held_lock+0x35/0x1d0 [ 15.837655] ? kvm_arch_dev_ioctl+0x3b0/0x3b0 [ 15.837921] ? __hrtick_start+0x1d0/0x1d0 [ 15.838178] ? avc_has_extended_perms+0x6e5/0x12c0 [ 15.838480] ? vcpu_load+0x4b/0x70 [ 15.838698] kvm_vcpu_ioctl+0x240/0x1010 [ 15.838949] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 15.839276] ? is_bpf_text_address+0xa4/0x120 [ 15.839566] ? avc_has_extended_perms+0x7fa/0x12c0 [ 15.839910] ? unwind_get_return_address+0x6e/0xa0 [ 15.840291] ? avc_ss_reset+0x110/0x110 [ 15.840550] ? putname+0xee/0x130 [ 15.840756] ? save_stack+0xa3/0xd0 [ 15.840972] ? save_stack+0x43/0xd0 [ 15.841196] ? kasan_slab_free+0x71/0xc0 [ 15.841436] ? kmem_cache_free+0x77/0x280 [ 15.841682] ? putname+0xee/0x130 [ 15.841896] ? do_sys_open+0x31b/0x6d0 [ 15.842142] ? __lock_is_held+0xb6/0x140 [ 15.842394] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 15.842814] ? rcu_note_context_switch+0x710/0x710 [ 15.843290] ? get_unused_fd_flags+0x190/0x190 [ 15.843721] ? __kvm_gfn_to_hva_cache_init+0xbb0/0xbb0 [ 15.844154] do_vfs_ioctl+0x1b1/0x1520 [ 15.844385] ? _cond_resched+0x14/0x30 [ 15.844619] ? ioctl_preallocate+0x2b0/0x2b0 [ 15.844879] ? selinux_capable+0x40/0x40 [ 15.845128] ? putname+0xf3/0x130 [ 15.845339] ? do_sys_open+0x320/0x6d0 [ 15.845573] ? security_file_ioctl+0x89/0xb0 [ 15.845835] SyS_ioctl+0x8f/0xc0 [ 15.846047] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 15.846366] RIP: 0033:0x437f47 [ 15.846619] RSP: 002b:00007ffd49e15f18 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 15.847103] RAX: ffffffffffffffda RBX: 00007ffd49e165e0 RCX: 0000000000437f47 [ 15.847649] RDX: 00007ffd49e165e0 RSI: 000000004008ae90 RDI: 0000000000000005 [ 15.848338] RBP: 0000000000000082 R08: 0000000000000001 R09: ffffffffffffffff [ 15.849042] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 [ 15.849734] R13: 00000000004040c0 R14: 0000000000000004 R15: 0000000000000000 [ 15.850417] 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 [ 15.852175] RIP: __check_object_size+0x3a2/0x4f0 RSP: ffff88003d477148 [ 15.852588] ---[ end trace 8ec009ce652ac1f6 ]--- [ 15.853064] Kernel panic - not syncing: Fatal exception [ 15.855417] Dumping ftrace buffer: [ 15.855741] (ftrace buffer empty) [ 15.856079] Kernel Offset: disabled [ 15.856301] Rebooting in 86400 seconds..