[....] Starting enhanced syslogd: rsyslogd[ 11.112990] audit: type=1400 audit(1514915413.094:4): avc: denied { syslog } for pid=3178 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.35' (ECDSA) to the list of known hosts. 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 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 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 syzkaller login: [ 21.990352] ================================================================== [ 21.991435] BUG: KASAN: out-of-bounds in unwind_get_return_address+0x92/0xa0 [ 21.992382] Read of size 8 at addr ffff8801c86ef880 by task syzkaller059598/3327 [ 21.993369] [ 21.993602] CPU: 1 PID: 3327 Comm: syzkaller059598 Not tainted 4.9.73-gf3f3457 #11 [ 21.994610] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.995848] ffff8801c84e7188 ffffffff81d922b9 ffffea000721bbc0 ffff8801c86ef880 [ 21.996995] 0000000000000000 ffff8801c86ef888 0000000000000000 ffff8801c84e71c0 [ 21.998133] ffffffff8153bab3 ffff8801c86ef880 0000000000000008 0000000000000000 [ 21.999285] Call Trace: [ 21.999645] [] dump_stack+0xc1/0x128 [ 22.000358] [] print_address_description+0x73/0x280 [ 22.001286] [] kasan_report+0x275/0x360 [ 22.002059] [] ? unwind_get_return_address+0x92/0xa0 [ 22.002947] [] __asan_report_load8_noabort+0x14/0x20 [ 22.003836] [] unwind_get_return_address+0x92/0xa0 [ 22.004703] [] __save_stack_trace+0x8d/0xf0 [ 22.005490] [] save_stack_trace_tsk+0x48/0x70 [ 22.006306] [] proc_pid_stack+0x146/0x230 [ 22.007071] [] ? lock_trace+0xc0/0xc0 [ 22.007793] [] proc_single_show+0xf8/0x170 [ 22.008574] [] seq_read+0x32f/0x1290 [ 22.009326] [] ? seq_escape+0x200/0x200 [ 22.010099] [] ? fsnotify+0x86/0xf30 [ 22.013103] [] ? fsnotify+0xf30/0xf30 [ 22.018520] [] ? avc_policy_seqno+0x9/0x20 [ 22.024372] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 22.031350] [] ? security_file_permission+0x89/0x1e0 [ 22.038070] [] ? seq_escape+0x200/0x200 [ 22.043661] [] ? seq_escape+0x200/0x200 [ 22.049260] [] do_readv_writev+0x520/0x750 [ 22.055117] [] ? vfs_write+0x530/0x530 [ 22.060623] [] ? kasan_unpoison_shadow+0x35/0x50 [ 22.066998] [] ? push_pipe+0x372/0x770 [ 22.072509] [] ? sanity+0x1ff/0x610 [ 22.077755] [] vfs_readv+0x84/0xc0 [ 22.082922] [] default_file_splice_read+0x43f/0x7a0 [ 22.089556] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 22.095840] [] ? do_splice_direct+0x270/0x270 [ 22.101954] [] ? __might_sleep+0x95/0x1a0 [ 22.107718] [] ? avc_policy_seqno+0x9/0x20 [ 22.113569] [] ? selinux_file_permission+0x82/0x460 [ 22.120210] [] ? security_file_permission+0x89/0x1e0 [ 22.126930] [] ? rw_verify_area+0xe5/0x2b0 [ 22.132780] [] ? do_splice_direct+0x270/0x270 [ 22.138898] [] do_splice_to+0x10a/0x160 [ 22.144488] [] splice_direct_to_actor+0x24d/0x800 [ 22.150948] [] ? generic_pipe_buf_nosteal+0x10/0x10 [ 22.157580] [] ? do_splice_to+0x160/0x160 [ 22.163344] [] ? security_file_permission+0x89/0x1e0 [ 22.170063] [] ? rw_verify_area+0xe5/0x2b0 [ 22.175914] [] do_splice_direct+0x1a7/0x270 [ 22.181853] [] ? splice_direct_to_actor+0x800/0x800 [ 22.188485] [] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 22.195029] [] ? __sb_start_write+0x14a/0x310 [ 22.201141] [] do_sendfile+0x54b/0xd30 [ 22.206656] [] ? do_compat_pwritev64+0x100/0x100 [ 22.213375] [] ? __might_fault+0x114/0x1d0 [ 22.219226] [] compat_SyS_sendfile+0xd1/0x160 [ 22.225338] [] ? SyS_sendfile64+0x160/0x160 [ 22.231276] [] ? do_fast_syscall_32+0xcf/0x890 [ 22.237477] [] ? SyS_sendfile64+0x160/0x160 [ 22.243413] [] do_fast_syscall_32+0x2f7/0x890 [ 22.249522] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 22.256156] [] entry_SYSENTER_compat+0x51/0x60 [ 22.262352] [ 22.263945] The buggy address belongs to the page: [ 22.268842] page:ffffea000721bbc0 count:0 mapcount:0 mapping: (null) index:0x0 [ 22.277064] flags: 0x8000000000000000() [ 22.281007] page dumped because: kasan: bad access detected [ 22.286679] [ 22.288272] Memory state around the buggy address: [ 22.293169] ffff8801c86ef780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 22.300491] ffff8801c86ef800: 00 00 00 f1 f1 f1 f1 00 00 00 00 f3 f3 f3 f3 00 [ 22.307818] >ffff8801c86ef880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 22.315147] ^ [ 22.318740] ffff8801c86ef900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 [ 22.326065] ffff8801c86ef980: 00 00 00 f2 00 00 00 00 00 00 00 00 00 00 00 00 [ 22.333405] ================================================================== [ 22.340726] Disabling lock debugging due to kernel taint [ 22.346867] Kernel panic - not syncing: panic_on_warn set ... [ 22.346867] [ 22.354240] CPU: 1 PID: 3327 Comm: syzkaller059598 Tainted: G B 4.9.73-gf3f3457 #11 [ 22.363142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.372486] ffff8801c84e70e0 ffffffff81d922b9 ffffffff841955bf ffff8801c84e71b8 [ 22.380461] 0000000000000000 ffff8801c86ef888 0000000000000000 ffff8801c84e71a8 [ 22.388400] ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585 [ 22.396364] Call Trace: [ 22.398921] [] dump_stack+0xc1/0x128 [ 22.404250] [] panic+0x1bc/0x3a8 [ 22.409234] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 22.417441] [] ? preempt_schedule+0x25/0x30 [ 22.423378] [] ? ___preempt_schedule+0x16/0x18 [ 22.429576] [] kasan_end_report+0x50/0x50 [ 22.435343] [] kasan_report+0x167/0x360 [ 22.440938] [] ? unwind_get_return_address+0x92/0xa0 [ 22.447655] [] __asan_report_load8_noabort+0x14/0x20 [ 22.454371] [] unwind_get_return_address+0x92/0xa0 [ 22.460916] [] __save_stack_trace+0x8d/0xf0 [ 22.466850] [] save_stack_trace_tsk+0x48/0x70 [ 22.472970] [] proc_pid_stack+0x146/0x230 [ 22.478739] [] ? lock_trace+0xc0/0xc0 [ 22.484160] [] proc_single_show+0xf8/0x170 [ 22.490019] [] seq_read+0x32f/0x1290 [ 22.495351] [] ? seq_escape+0x200/0x200 [ 22.500941] [] ? fsnotify+0x86/0xf30 [ 22.506287] [] ? fsnotify+0xf30/0xf30 [ 22.511710] [] ? avc_policy_seqno+0x9/0x20 [ 22.517581] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 22.524565] [] ? security_file_permission+0x89/0x1e0 [ 22.531285] [] ? seq_escape+0x200/0x200 [ 22.536873] [] ? seq_escape+0x200/0x200 [ 22.542462] [] do_readv_writev+0x520/0x750 [ 22.548310] [] ? vfs_write+0x530/0x530 [ 22.553822] [] ? kasan_unpoison_shadow+0x35/0x50 [ 22.560194] [] ? push_pipe+0x372/0x770 [ 22.565694] [] ? sanity+0x1ff/0x610 [ 22.570942] [] vfs_readv+0x84/0xc0 [ 22.576098] [] default_file_splice_read+0x43f/0x7a0 [ 22.582730] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 22.589012] [] ? do_splice_direct+0x270/0x270 [ 22.595131] [] ? __might_sleep+0x95/0x1a0 [ 22.600895] [] ? avc_policy_seqno+0x9/0x20 [ 22.606752] [] ? selinux_file_permission+0x82/0x460 [ 22.613393] [] ? security_file_permission+0x89/0x1e0 [ 22.620113] [] ? rw_verify_area+0xe5/0x2b0 [ 22.625962] [] ? do_splice_direct+0x270/0x270 [ 22.632071] [] do_splice_to+0x10a/0x160 [ 22.637666] [] splice_direct_to_actor+0x24d/0x800 [ 22.644123] [] ? generic_pipe_buf_nosteal+0x10/0x10 [ 22.650760] [] ? do_splice_to+0x160/0x160 [ 22.656521] [] ? security_file_permission+0x89/0x1e0 [ 22.663239] [] ? rw_verify_area+0xe5/0x2b0 [ 22.669096] [] do_splice_direct+0x1a7/0x270 [ 22.675035] [] ? splice_direct_to_actor+0x800/0x800 [ 22.681672] [] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 22.688223] [] ? __sb_start_write+0x14a/0x310 [ 22.694341] [] do_sendfile+0x54b/0xd30 [ 22.699849] [] ? do_compat_pwritev64+0x100/0x100 [ 22.706224] [] ? __might_fault+0x114/0x1d0 [ 22.712086] [] compat_SyS_sendfile+0xd1/0x160 [ 22.718198] [] ? SyS_sendfile64+0x160/0x160 [ 22.724139] [] ? do_fast_syscall_32+0xcf/0x890 [ 22.730335] [] ? SyS_sendfile64+0x160/0x160 [ 22.736275] [] do_fast_syscall_32+0x2f7/0x890 [ 22.742391] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 22.749038] [] entry_SYSENTER_compat+0x51/0x60 [ 22.755660] Dumping ftrace buffer: [ 22.759166] (ftrace buffer empty) [ 22.762842] Kernel Offset: disabled [ 22.766440] Rebooting in 86400 seconds..