[....] Starting enhanced syslogd: rsyslogd[ 10.336531] audit: type=1400 audit(1515735811.316:4): avc: denied { syslog } for pid=3184 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.237' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 19.075130] ================================================================== [ 19.076251] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 19.077375] Read of size 8 at addr ffff8801c894e440 by task syzkaller551141/3334 [ 19.078391] [ 19.078622] CPU: 0 PID: 3334 Comm: syzkaller551141 Not tainted 4.9.76-g9154940 #10 [ 19.079658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.080914] ffff8801c90dfab0 ffffffff81d93149 ffffea0007225380 ffff8801c894e440 [ 19.082133] 0000000000000000 ffff8801c894e440 ffff8801c92bc438 ffff8801c90dfae8 [ 19.083365] ffffffff8153cb43 ffff8801c894e440 0000000000000008 0000000000000000 [ 19.084588] Call Trace: [ 19.085008] [] dump_stack+0xc1/0x128 [ 19.085772] [] print_address_description+0x73/0x280 [ 19.086728] [] kasan_report+0x275/0x360 [ 19.087567] [] ? sg_remove_request+0x103/0x120 [ 19.088415] [] __asan_report_load8_noabort+0x14/0x20 [ 19.090338] [] sg_remove_request+0x103/0x120 [ 19.091197] [] sg_finish_rem_req+0x295/0x340 [ 19.092135] [] sg_read+0xa1c/0x1440 [ 19.092847] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.093737] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 19.094697] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.095583] [] __vfs_read+0x103/0x670 [ 19.100998] [] ? default_llseek+0x290/0x290 [ 19.106939] [] ? fsnotify+0x86/0xf30 [ 19.112267] [] ? fsnotify+0xf30/0xf30 [ 19.117692] [] ? avc_policy_seqno+0x9/0x20 [ 19.123543] [] ? selinux_file_permission+0x82/0x460 [ 19.130179] [] ? security_file_permission+0x89/0x1e0 [ 19.136898] [] ? rw_verify_area+0xe5/0x2b0 [ 19.142753] [] vfs_read+0x11e/0x380 [ 19.147994] [] SyS_read+0xd9/0x1b0 [ 19.153153] [] ? vfs_copy_file_range+0x740/0x740 [ 19.159530] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.166336] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 19.172881] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 19.179423] [ 19.181017] Allocated by task 0: [ 19.184345] (stack is not available) [ 19.188021] [ 19.189619] Freed by task 0: [ 19.192603] (stack is not available) [ 19.196281] [ 19.197874] The buggy address belongs to the object at ffff8801c894e400 [ 19.197874] which belongs to the cache fasync_cache of size 96 [ 19.210497] The buggy address is located 64 bytes inside of [ 19.210497] 96-byte region [ffff8801c894e400, ffff8801c894e460) [ 19.222158] The buggy address belongs to the page: [ 19.227053] page:ffffea0007225380 count:1 mapcount:0 mapping: (null) index:0x0 [ 19.235271] flags: 0x8000000000000080(slab) [ 19.239553] page dumped because: kasan: bad access detected [ 19.245227] [ 19.246825] Memory state around the buggy address: [ 19.251720] ffff8801c894e300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 19.259050] ffff8801c894e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.266375] >ffff8801c894e400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.273698] ^ [ 19.279112] ffff8801c894e480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.286436] ffff8801c894e500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.293765] ================================================================== [ 19.301099] Disabling lock debugging due to kernel taint [ 19.306864] Kernel panic - not syncing: panic_on_warn set ... [ 19.306864] [ 19.314210] CPU: 0 PID: 3334 Comm: syzkaller551141 Tainted: G B 4.9.76-g9154940 #10 [ 19.323097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.332430] ffff8801c90dfa08 ffffffff81d93149 ffffffff84195c17 ffff8801c90dfae0 [ 19.340398] 0000000000000000 ffff8801c894e440 ffff8801c92bc438 ffff8801c90dfad0 [ 19.348356] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5 [ 19.356306] Call Trace: [ 19.358861] [] dump_stack+0xc1/0x128 [ 19.364190] [] panic+0x1bc/0x3a8 [ 19.369178] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 19.377371] [] ? preempt_schedule+0x25/0x30 [ 19.383317] [] ? ___preempt_schedule+0x16/0x18 [ 19.389517] [] kasan_end_report+0x50/0x50 [ 19.395288] [] kasan_report+0x167/0x360 [ 19.400884] [] ? sg_remove_request+0x103/0x120 [ 19.407091] [] __asan_report_load8_noabort+0x14/0x20 [ 19.413813] [] sg_remove_request+0x103/0x120 [ 19.419843] [] sg_finish_rem_req+0x295/0x340 [ 19.425868] [] sg_read+0xa1c/0x1440 [ 19.431120] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.437761] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 19.444741] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.451373] [] __vfs_read+0x103/0x670 [ 19.456789] [] ? default_llseek+0x290/0x290 [ 19.463598] [] ? fsnotify+0x86/0xf30 [ 19.468928] [] ? fsnotify+0xf30/0xf30 [ 19.474346] [] ? avc_policy_seqno+0x9/0x20 [ 19.480194] [] ? selinux_file_permission+0x82/0x460 [ 19.486823] [] ? security_file_permission+0x89/0x1e0 [ 19.493542] [] ? rw_verify_area+0xe5/0x2b0 [ 19.499397] [] vfs_read+0x11e/0x380 [ 19.504638] [] SyS_read+0xd9/0x1b0 [ 19.509797] [] ? vfs_copy_file_range+0x740/0x740 [ 19.516179] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.522994] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 19.529540] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 19.536585] Dumping ftrace buffer: [ 19.540091] (ftrace buffer empty) [ 19.543773] Kernel Offset: disabled [ 19.547373] Rebooting in 86400 seconds..