[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.111855][ T26] audit: type=1800 audit(1552353234.182:25): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.133796][ T26] audit: type=1800 audit(1552353234.182:26): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.176099][ T26] audit: type=1800 audit(1552353234.182:27): pid=7812 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.148' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.296439][ T7968] ------------[ cut here ]------------ [ 48.302392][ T7968] Bad or missing usercopy whitelist? Kernel memory exposure attempt detected from SLAB object 'fanotify_event' (offset 40, size 8)! [ 48.316402][ T7968] WARNING: CPU: 0 PID: 7968 at mm/usercopy.c:78 usercopy_warn+0xeb/0x110 [ 48.324812][ T7968] Kernel panic - not syncing: panic_on_warn set ... [ 48.331385][ T7968] CPU: 0 PID: 7968 Comm: syz-executor245 Not tainted 5.0.0+ #18 [ 48.338991][ T7968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.349025][ T7968] Call Trace: [ 48.352307][ T7968] dump_stack+0x172/0x1f0 [ 48.356620][ T7968] ? usercopy_warn+0x10/0x110 [ 48.361293][ T7968] panic+0x2cb/0x65c [ 48.365179][ T7968] ? __warn_printk+0xf3/0xf3 [ 48.369763][ T7968] ? usercopy_warn+0xeb/0x110 [ 48.374428][ T7968] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.380683][ T7968] ? __warn.cold+0x5/0x45 [ 48.385020][ T7968] ? __warn+0xe8/0x1d0 [ 48.389090][ T7968] ? usercopy_warn+0xeb/0x110 [ 48.393764][ T7968] __warn.cold+0x20/0x45 [ 48.397996][ T7968] ? usercopy_warn+0xeb/0x110 [ 48.402666][ T7968] report_bug+0x263/0x2b0 [ 48.406985][ T7968] do_error_trap+0x11b/0x200 [ 48.411556][ T7968] do_invalid_op+0x37/0x50 [ 48.416777][ T7968] ? usercopy_warn+0xeb/0x110 [ 48.421452][ T7968] invalid_op+0x14/0x20 [ 48.425587][ T7968] RIP: 0010:usercopy_warn+0xeb/0x110 [ 48.430849][ T7968] Code: c8 e8 39 89 c0 ff 4c 8b 45 c0 4d 89 e9 4c 89 e1 48 8b 55 c8 41 57 48 89 de 48 c7 c7 a0 dc 74 87 ff 75 d0 41 56 e8 63 4b 93 ff <0f> 0b 48 83 c4 18 e9 46 ff ff ff 49 c7 c5 a0 da 74 87 4d 89 ee 4d [ 48.450459][ T7968] RSP: 0018:ffff88808805fb18 EFLAGS: 00010282 [ 48.456531][ T7968] RAX: 0000000000000000 RBX: ffffffff8774dc60 RCX: 0000000000000000 [ 48.464497][ T7968] RDX: 0000000000000000 RSI: ffffffff815ad7b6 RDI: ffffed101100bf55 [ 48.472463][ T7968] RBP: ffff88808805fb70 R08: ffff8880a90d4400 R09: 0000000000000000 [ 48.480414][ T7968] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8859448d [ 48.488396][ T7968] R13: ffffffff8775d4c0 R14: ffffffff8774dae0 R15: 0000000000000008 [ 48.496378][ T7968] ? vprintk_func+0x86/0x189 [ 48.500976][ T7968] ? usercopy_warn+0xeb/0x110 [ 48.505639][ T7968] __check_heap_object+0x88/0xb3 [ 48.510557][ T7968] __check_object_size+0x342/0x42f [ 48.515647][ T7968] fanotify_read+0xde0/0x1430 [ 48.520312][ T7968] ? fanotify_release+0x350/0x350 [ 48.525319][ T7968] ? fsnotify+0xbc0/0xbc0 [ 48.529631][ T7968] ? fsnotify_first_mark+0x210/0x210 [ 48.534900][ T7968] ? do_wait_intr_irq+0x2b0/0x2b0 [ 48.539923][ T7968] ? __fget+0x381/0x550 [ 48.544066][ T7968] ? security_file_permission+0x94/0x380 [ 48.549683][ T7968] __vfs_read+0x8d/0x110 [ 48.553904][ T7968] ? fanotify_release+0x350/0x350 [ 48.558915][ T7968] vfs_read+0x194/0x3e0 [ 48.563068][ T7968] ksys_read+0xea/0x1f0 [ 48.567204][ T7968] ? kernel_write+0x120/0x120 [ 48.571879][ T7968] ? do_syscall_64+0x26/0x610 [ 48.576549][ T7968] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.582614][ T7968] ? do_syscall_64+0x26/0x610 [ 48.587278][ T7968] __x64_sys_read+0x73/0xb0 [ 48.591780][ T7968] do_syscall_64+0x103/0x610 [ 48.596353][ T7968] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.602243][ T7968] RIP: 0033:0x4456b9 [ 48.606116][ T7968] Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 48.625722][ T7968] RSP: 002b:00007f254fba2db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 48.634117][ T7968] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 00000000004456b9 [ 48.642067][ T7968] RDX: 000000000000006b RSI: 0000000020000000 RDI: 0000000000000004 [ 48.650027][ T7968] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 48.658090][ T7968] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c [ 48.666043][ T7968] R13: 00007ffe4bf739ff R14: 00007f254fba39c0 R15: 20c49ba5e353f7cf [ 48.674846][ T7968] Kernel Offset: disabled [ 48.679235][ T7968] Rebooting in 86400 seconds..