[ 33.863193] audit: type=1800 audit(1561233807.275:33): pid=6916 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 33.892844] audit: type=1800 audit(1561233807.275:34): pid=6916 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 38.988790] random: sshd: uninitialized urandom read (32 bytes read) [ 39.219008] audit: type=1400 audit(1561233812.625:35): avc: denied { map } for pid=7089 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 39.269065] random: sshd: uninitialized urandom read (32 bytes read) [ 39.826247] random: sshd: uninitialized urandom read (32 bytes read) [ 40.017708] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts. [ 45.628542] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program [ 45.755326] audit: type=1400 audit(1561233819.165:36): avc: denied { map } for pid=7101 comm="syz-executor844" path="/root/syz-executor844656976" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 45.773320] 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. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.565393] BUG: unable to handle kernel paging request at ffffed12314782b3 [ 47.571456] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.572559] IP: coalesced_mmio_write+0x240/0x440 [ 47.572564] PGD 21ffef067 P4D 21ffef067 PUD 0 [ 47.579854] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.583687] Oops: 0000 [#1] PREEMPT SMP KASAN [ 47.583694] Modules linked in: [ 47.583704] CPU: 0 PID: 7312 Comm: syz-executor844 Not tainted 4.14.129 #23 [ 47.583707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.583712] task: ffff888098d20480 task.stack: ffff88809e078000 [ 47.583725] RIP: 0010:coalesced_mmio_write+0x240/0x440 [ 47.583728] RSP: 0018:ffff88809e07f428 EFLAGS: 00010a02 [ 47.583735] RAX: 00000000b52b40e6 RBX: 0000000000000000 RCX: ffff88808e2e0000 [ 47.583739] RDX: dffffc0000000000 RSI: 1ffff112314782b3 RDI: ffff88918a3c1598 [ 47.583743] RBP: ffff88809e07f478 R08: 0000000000000007 R09: 0000000000000000 [ 47.583747] R10: ffff888098d20d50 R11: ffff888098d20480 R12: ffff888092dc3f10 executing program [ 47.583751] R13: 0000000000000001 R14: ffff888097a651a0 R15: 0000000000000001 [ 47.583759] FS: 00007f2e72e8c700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 [ 47.590632] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.594652] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.594657] CR2: ffffed12314782b3 CR3: 00000000a00d6000 CR4: 00000000001426f0 [ 47.594664] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 executing program [ 47.594668] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.594672] Call Trace: [ 47.594698] __kvm_io_bus_write+0x241/0x340 [ 47.599346] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.602381] ? coalesced_mmio_destructor+0x160/0x160 [ 47.602394] kvm_io_bus_write+0x115/0x200 [ 47.602401] ? kvm_vcpu_check_block+0xa0/0xa0 [ 47.602410] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 47.602419] write_mmio+0x148/0x480 [ 47.602429] emulator_read_write_onepage+0x36a/0xbb0 [ 47.602440] emulator_read_write+0x174/0x540 [ 47.602448] emulator_write_emulated+0x3c/0x50 [ 47.602460] segmented_write+0xd3/0x120 [ 47.617405] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.619023] ? em_fxsave+0x40/0x40 [ 47.619034] writeback+0x425/0x760 [ 47.619047] ? __emulate_int_real+0x660/0x660 [ 47.634952] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.635943] ? x86_decode_insn+0xbc5/0x4ea0 [ 47.635951] ? fastop+0x17a/0x290 [ 47.635964] ? em_salc+0x8/0x8 executing program [ 47.646099] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.650597] x86_emulate_insn+0x15f2/0x4120 [ 47.650608] ? init_decode_cache+0xc0/0xc0 [ 47.650618] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 47.650628] x86_emulate_instruction+0x423/0x1700 [ 47.650637] ? __lock_is_held+0xb6/0x140 [ 47.650647] ? reexecute_instruction.part.0+0x260/0x260 [ 47.658432] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.665375] ? mmio_info_in_cache+0x118/0x440 [ 47.665384] kvm_mmu_page_fault+0x1c5/0x300 [ 47.665397] handle_ept_violation+0x149/0x420 [ 47.665403] ? handle_pause+0x410/0x410 [ 47.665410] vmx_handle_exit+0x20d/0x12a0 [ 47.665420] ? vcpu_enter_guest+0xccd/0x5220 [ 47.682195] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.689921] vcpu_enter_guest+0xec8/0x5220 [ 47.689932] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 47.689943] ? emulator_read_emulated+0x50/0x50 [ 47.689955] ? kvm_check_async_pf_completion+0x2a9/0x410 [ 47.696013] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.703129] kvm_arch_vcpu_ioctl_run+0x318/0x1000 [ 47.703137] ? kvm_arch_vcpu_ioctl_run+0x318/0x1000 [ 47.703150] kvm_vcpu_ioctl+0x401/0xd10 [ 47.703157] ? kvm_vcpu_block+0xbb0/0xbb0 [ 47.703168] ? trace_hardirqs_on+0x10/0x10 [ 47.703176] ? save_trace+0x290/0x290 [ 47.703189] ? exit_robust_list+0x230/0x230 [ 47.725526] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.734575] ? lock_downgrade+0x6e0/0x6e0 [ 47.734587] ? __fget+0x210/0x370 [ 47.734595] ? find_held_lock+0x35/0x130 [ 47.734600] ? __fget+0x210/0x370 [ 47.734610] ? kvm_vcpu_block+0xbb0/0xbb0 [ 47.734618] do_vfs_ioctl+0x7ae/0x1060 [ 47.734629] ? selinux_file_mprotect+0x5d0/0x5d0 [ 47.734639] ? lock_downgrade+0x6e0/0x6e0 [ 47.739903] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.743995] ? ioctl_preallocate+0x1c0/0x1c0 [ 47.744003] ? __fget+0x237/0x370 [ 47.744014] ? security_file_ioctl+0x7d/0xb0 [ 47.744018] ? security_file_ioctl+0x89/0xb0 [ 47.744026] SyS_ioctl+0x8f/0xc0 [ 47.744032] ? do_vfs_ioctl+0x1060/0x1060 [ 47.744042] do_syscall_64+0x1e8/0x640 [ 47.744049] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.744059] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 47.744071] RIP: 0033:0x44a2e9 [ 47.759109] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.762855] RSP: 002b:00007f2e72e8bce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.762865] RAX: ffffffffffffffda RBX: 00000000006e0c48 RCX: 000000000044a2e9 [ 47.762870] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 47.762874] RBP: 00000000006e0c40 R08: 0000000000000000 R09: 0000000000000000 [ 47.762878] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e0c4c [ 47.762882] R13: 00007fffc896098f R14: 00007f2e72e8c9c0 R15: 20c49ba5e353f7cf [ 47.762890] Code: c0 03 38 d0 7c 08 84 d2 0f 85 00 02 [ 47.767435] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.771894] 00 00 8b 41 04 48 8d 14 40 48 8d 7c d1 08 48 ba 00 00 00 00 00 fc ff df 48 89 fe 48 c1 ee 03 <80> [ 47.791277] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.793723] 3c 16 00 0f 85 bf 01 00 00 48 8d 14 40 48 be 00 00 [ 47.802974] kobject: 'kvm' (ffff8880a6e84390): fill_kobj_path: path = '/devices/virtual/misc/kvm' [ 47.807082] 00 00 00 [ 47.807103] RIP: coalesced_mmio_write+0x240/0x440 RSP: ffff88809e07f428 [ 47.807106] CR2: ffffed12314782b3 [ 47.807119] ---[ end trace 9655ab5c0c048802 ]--- [ 47.807128] Kernel panic - not syncing: Fatal exception [ 47.820499] kobject: 'kvm' (ffff8880a6e84390): kobject_uevent_env [ 47.825419] Kernel Offset: disabled [ 48.171965] Rebooting in 86400 seconds..