[ 36.085625] audit: type=1800 audit(1555093794.260:33): pid=6986 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 [ 36.112407] audit: type=1800 audit(1555093794.260:34): pid=6986 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: [ 45.199452] random: sshd: uninitialized urandom read (32 bytes read) [ 45.541902] audit: type=1400 audit(1555093803.720:35): avc: denied { map } for pid=7156 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 [ 45.594414] random: sshd: uninitialized urandom read (32 bytes read) [ 46.182687] random: sshd: uninitialized urandom read (32 bytes read) [ 46.375304] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 51.945677] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 52.067039] audit: type=1400 audit(1555093810.240:36): avc: denied { map } for pid=7168 comm="syz-executor564" path="/root/syz-executor564431398" 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 [ 52.069832] kasan: CONFIG_KASAN_INLINE enabled [ 52.107995] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 52.123089] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 52.139189] Modules linked in: [ 52.142369] CPU: 1 PID: 7168 Comm: syz-executor564 Not tainted 4.14.111 #1 [ 52.150487] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.159838] task: ffff888091624740 task.stack: ffff888078080000 [ 52.165882] RIP: 0010:vhost_chr_write_iter+0x4a9/0x1260 [ 52.171225] RSP: 0018:ffff888078087b90 EFLAGS: 00010246 [ 52.176586] RAX: 0000000000000002 RBX: dffffc0000000000 RCX: 0000000000000000 [ 52.184472] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888074a60240 [ 52.191723] RBP: ffff888078087cb0 R08: dffffc0000000000 R09: 0000000000000000 [ 52.201510] R10: ffff888078087b80 R11: ffff888091624740 R12: ffff888074a64940 [ 52.210896] R13: 0000000000000000 R14: ffff888074a60180 R15: 0000000000000000 [ 52.219916] FS: 0000000001477880(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 [ 52.236586] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.248803] CR2: 0000000020000080 CR3: 00000000a6f50000 CR4: 00000000001406e0 [ 52.256367] Call Trace: [ 52.259154] ? putname+0xdb/0x120 [ 52.264227] ? do_sys_open+0x21c/0x430 [ 52.272664] ? SyS_openat+0x30/0x40 [ 52.276381] ? do_syscall_64+0x1eb/0x630 [ 52.280563] ? vhost_new_umem_range+0x690/0x690 [ 52.286926] vhost_net_chr_write_iter+0x59/0x70 [ 52.294750] __vfs_write+0x4ae/0x6c0 [ 52.299403] ? kernel_read+0x120/0x120 [ 52.303296] ? rw_verify_area+0xea/0x2b0 [ 52.308881] vfs_write+0x198/0x500 [ 52.313890] SyS_write+0xb8/0x180 [ 52.318223] ? SyS_read+0x180/0x180 [ 52.321850] ? do_syscall_64+0x53/0x630 [ 52.325821] ? SyS_read+0x180/0x180 [ 52.329542] do_syscall_64+0x1eb/0x630 [ 52.333418] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.339479] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 52.345889] RIP: 0033:0x440209 [ 52.349062] RSP: 002b:00007ffc0de061c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 52.358108] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440209 [ 52.366925] RDX: 0000000000000068 RSI: 0000000020000280 RDI: 0000000000000003 [ 52.375137] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 52.382407] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a90 [ 52.389659] R13: 0000000000401b20 R14: 0000000000000000 R15: 0000000000000000 [ 52.396914] Code: ff ff 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 9c 0c 00 00 49 8b 8e c0 00 00 00 48 ba 00 00 00 00 00 fc ff df 49 89 cf 48 c1 e9 03 <80> 3c 11 00 0f 85 61 0c 00 00 4d 8b 27 4d 85 e4 0f 84 27 09 00 [ 52.417498] RIP: vhost_chr_write_iter+0x4a9/0x1260 RSP: ffff888078087b90 [ 52.424555] ---[ end trace d220b034738c198e ]--- [ 52.429316] Kernel panic - not syncing: Fatal exception [ 52.436446] Kernel Offset: disabled [ 52.441804] Rebooting in 86400 seconds..