[ 35.853021] audit: type=1800 audit(1581778074.187:33): pid=7197 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 [ 35.880788] audit: type=1800 audit(1581778074.187:34): pid=7197 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: [ 40.507026] random: sshd: uninitialized urandom read (32 bytes read) [ 40.758158] audit: type=1400 audit(1581778079.087:35): avc: denied { map } for pid=7369 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 [ 40.855545] random: sshd: uninitialized urandom read (32 bytes read) [ 41.589546] random: sshd: uninitialized urandom read (32 bytes read) [ 41.807092] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. [ 47.447019] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 47.564001] audit: type=1400 audit(1581778085.897:36): avc: denied { map } for pid=7381 comm="syz-executor393" path="/root/syz-executor393150704" 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 [ 47.583545] ================================================================== [ 47.598019] BUG: KASAN: stack-out-of-bounds in ax25_getname+0x55/0x7a0 [ 47.604716] Write of size 72 at addr ffff88808e087cf8 by task syz-executor393/7381 [ 47.612409] [ 47.614031] CPU: 0 PID: 7381 Comm: syz-executor393 Not tainted 4.14.171-syzkaller #0 [ 47.621899] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.631241] Call Trace: [ 47.633849] dump_stack+0x142/0x197 [ 47.637908] ? ax25_getname+0x55/0x7a0 [ 47.641982] print_address_description.cold+0x7c/0x1dc [ 47.647269] ? ax25_getname+0x55/0x7a0 [ 47.651253] kasan_report.cold+0xa9/0x2af [ 47.655557] check_memory_region+0x123/0x190 [ 47.660032] memset+0x24/0x40 [ 47.663312] ax25_getname+0x55/0x7a0 [ 47.667031] ? fget+0x1b/0x20 [ 47.670216] vhost_net_ioctl+0xe91/0x14c0 [ 47.674363] ? vhost_net_stop_vq+0xf0/0xf0 [ 47.678597] ? __might_sleep+0x93/0xb0 [ 47.682511] ? save_trace+0x290/0x290 [ 47.686434] ? vhost_net_stop_vq+0xf0/0xf0 [ 47.690657] do_vfs_ioctl+0x7ae/0x1060 [ 47.694809] ? selinux_file_mprotect+0x5d0/0x5d0 [ 47.699605] ? ioctl_preallocate+0x1c0/0x1c0 [ 47.704006] ? lock_downgrade+0x740/0x740 [ 47.708258] ? security_file_ioctl+0x7d/0xb0 [ 47.712655] ? security_file_ioctl+0x89/0xb0 [ 47.717057] SyS_ioctl+0x8f/0xc0 [ 47.720415] ? do_vfs_ioctl+0x1060/0x1060 [ 47.724565] do_syscall_64+0x1e8/0x640 [ 47.728466] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.733306] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 47.738497] RIP: 0033:0x440259 [ 47.741676] RSP: 002b:00007fffb18f7ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.749377] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440259 [ 47.756867] RDX: 0000000020f1dff8 RSI: 000000004008af30 RDI: 0000000000000003 [ 47.764131] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 47.771676] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401ae0 [ 47.778953] R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000 [ 47.786233] [ 47.787859] The buggy address belongs to the page: [ 47.792780] page:ffffea00023821c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 47.801787] flags: 0xfffe0000000000() [ 47.805580] raw: 00fffe0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 47.813599] raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 [ 47.821463] page dumped because: kasan: bad access detected [ 47.828033] [ 47.829641] Memory state around the buggy address: [ 47.834567] ffff88808e087c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 [ 47.841918] ffff88808e087c80: f1 f1 f1 04 f2 04 f2 00 f2 f2 f2 00 f2 f2 f2 00 [ 47.849271] >ffff88808e087d00: 00 00 00 00 00 04 f3 f3 f3 f3 f3 00 00 00 00 00 [ 47.856625] ^ [ 47.861292] ffff88808e087d80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 [ 47.868645] ffff88808e087e00: 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 f3 f3 f3 f3 [ 47.875993] ================================================================== [ 47.883606] Disabling lock debugging due to kernel taint [ 47.890351] Kernel panic - not syncing: panic_on_warn set ... [ 47.890351] [ 47.897868] CPU: 0 PID: 7381 Comm: syz-executor393 Tainted: G B 4.14.171-syzkaller #0 [ 47.906972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.917356] Call Trace: [ 47.919941] dump_stack+0x142/0x197 [ 47.923986] ? ax25_getname+0x55/0x7a0 [ 47.927973] panic+0x1f9/0x42d [ 47.931168] ? add_taint.cold+0x16/0x16 [ 47.935124] ? ___preempt_schedule+0x16/0x18 [ 47.939525] kasan_end_report+0x47/0x4f [ 47.943601] kasan_report.cold+0x130/0x2af [ 47.947827] check_memory_region+0x123/0x190 [ 47.952222] memset+0x24/0x40 [ 47.955316] ax25_getname+0x55/0x7a0 [ 47.959021] ? fget+0x1b/0x20 [ 47.962109] vhost_net_ioctl+0xe91/0x14c0 [ 47.966248] ? vhost_net_stop_vq+0xf0/0xf0 [ 47.970558] ? __might_sleep+0x93/0xb0 [ 47.974433] ? save_trace+0x290/0x290 [ 47.978224] ? vhost_net_stop_vq+0xf0/0xf0 [ 47.982451] do_vfs_ioctl+0x7ae/0x1060 [ 47.986333] ? selinux_file_mprotect+0x5d0/0x5d0 [ 47.991077] ? ioctl_preallocate+0x1c0/0x1c0 [ 47.995510] ? lock_downgrade+0x740/0x740 [ 47.999802] ? security_file_ioctl+0x7d/0xb0 [ 48.004193] ? security_file_ioctl+0x89/0xb0 [ 48.008718] SyS_ioctl+0x8f/0xc0 [ 48.012078] ? do_vfs_ioctl+0x1060/0x1060 [ 48.016374] do_syscall_64+0x1e8/0x640 [ 48.020249] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.025081] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 48.030263] RIP: 0033:0x440259 [ 48.033434] RSP: 002b:00007fffb18f7ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 48.041132] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440259 [ 48.048389] RDX: 0000000020f1dff8 RSI: 000000004008af30 RDI: 0000000000000003 [ 48.055654] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 48.062914] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401ae0 [ 48.070168] R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000 [ 48.078991] Kernel Offset: disabled [ 48.082630] Rebooting in 86400 seconds..