[....] Starting enhanced syslogd: rsyslogd[ 10.373342] audit: type=1400 audit(1515958315.477:4): avc: denied { syslog } for pid=3177 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.15.199' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 24.050802] ================================================================== [ 24.051964] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 24.052962] Read of size 8 at addr ffff8801cab6a240 by task syzkaller018669/3335 [ 24.053984] [ 24.054218] CPU: 1 PID: 3335 Comm: syzkaller018669 Not tainted 4.9.76-gf0f6293 #12 [ 24.055250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.056483] ffff8801c7dffab0 ffffffff81d93149 ffffea00072ada80 ffff8801cab6a240 [ 24.057655] 0000000000000000 ffff8801cab6a240 ffff8801c7d78238 ffff8801c7dffae8 [ 24.058807] ffffffff8153cb43 ffff8801cab6a240 0000000000000008 0000000000000000 [ 24.059973] Call Trace: [ 24.060332] [] dump_stack+0xc1/0x128 [ 24.061050] [] print_address_description+0x73/0x280 [ 24.061947] [] kasan_report+0x275/0x360 [ 24.062705] [] ? sg_remove_request+0x103/0x120 [ 24.063541] [] __asan_report_load8_noabort+0x14/0x20 [ 24.064463] [] sg_remove_request+0x103/0x120 [ 24.065269] [] sg_finish_rem_req+0x295/0x340 [ 24.066077] [] sg_read+0xa1c/0x1440 [ 24.066813] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.067708] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 24.068641] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.069534] [] __vfs_read+0x103/0x670 [ 24.070272] [] ? default_llseek+0x290/0x290 [ 24.072779] [] ? fsnotify+0x86/0xf30 [ 24.078109] [] ? fsnotify+0xf30/0xf30 [ 24.083531] [] ? avc_policy_seqno+0x9/0x20 [ 24.089385] [] ? selinux_file_permission+0x82/0x460 [ 24.096022] [] ? security_file_permission+0x89/0x1e0 [ 24.102744] [] ? rw_verify_area+0xe5/0x2b0 [ 24.108607] [] vfs_read+0x11e/0x380 [ 24.113852] [] SyS_read+0xd9/0x1b0 [ 24.119011] [] ? vfs_copy_file_range+0x740/0x740 [ 24.125396] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.132213] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.138764] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 24.145312] [ 24.146911] Allocated by task 0: [ 24.150269] (stack is not available) [ 24.153948] [ 24.155543] Freed by task 0: [ 24.158528] (stack is not available) [ 24.162211] [ 24.163808] The buggy address belongs to the object at ffff8801cab6a200 [ 24.163808] which belongs to the cache fasync_cache of size 96 [ 24.176451] The buggy address is located 64 bytes inside of [ 24.176451] 96-byte region [ffff8801cab6a200, ffff8801cab6a260) [ 24.188122] The buggy address belongs to the page: [ 24.193028] page:ffffea00072ada80 count:1 mapcount:0 mapping: (null) index:0x0 [ 24.201277] flags: 0x8000000000000080(slab) [ 24.205565] page dumped because: kasan: bad access detected [ 24.211244] [ 24.212845] Memory state around the buggy address: [ 24.217745] ffff8801cab6a100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 24.225073] ffff8801cab6a180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.233186] >ffff8801cab6a200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.240520] ^ executing program [ 24.245959] ffff8801cab6a280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.253723] ffff8801cab6a300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.261058] ================================================================== [ 24.268386] Disabling lock debugging due to kernel taint [ 24.274182] Kernel panic - not syncing: panic_on_warn set ... [ 24.274182] [ 24.281535] CPU: 1 PID: 3335 Comm: syzkaller018669 Tainted: G B 4.9.76-gf0f6293 #12 [ 24.290436] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.299769] ffff8801c7dffa08 ffffffff81d93149 ffffffff84195c17 ffff8801c7dffae0 [ 24.307758] 0000000000000000 ffff8801cab6a240 ffff8801c7d78238 ffff8801c7dffad0 [ 24.315794] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5 [ 24.323779] Call Trace: [ 24.326431] [] dump_stack+0xc1/0x128 [ 24.331767] [] panic+0x1bc/0x3a8 [ 24.336769] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 24.344969] [] ? preempt_schedule+0x25/0x30 [ 24.350911] [] ? ___preempt_schedule+0x16/0x18 [ 24.357122] [] kasan_end_report+0x50/0x50 [ 24.362904] [] kasan_report+0x167/0x360 [ 24.368933] [] ? sg_remove_request+0x103/0x120 [ 24.375137] [] __asan_report_load8_noabort+0x14/0x20 [ 24.381862] [] sg_remove_request+0x103/0x120 [ 24.387890] [] sg_finish_rem_req+0x295/0x340 [ 24.393919] [] sg_read+0xa1c/0x1440 [ 24.399176] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.405816] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 24.412802] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.419444] [] __vfs_read+0x103/0x670 [ 24.424868] [] ? default_llseek+0x290/0x290 [ 24.430811] [] ? fsnotify+0x86/0xf30 [ 24.436144] [] ? fsnotify+0xf30/0xf30 [ 24.441567] [] ? avc_policy_seqno+0x9/0x20 [ 24.447420] [] ? selinux_file_permission+0x82/0x460 [ 24.454143] [] ? security_file_permission+0x89/0x1e0 [ 24.460865] [] ? rw_verify_area+0xe5/0x2b0 [ 24.466730] [] vfs_read+0x11e/0x380 [ 24.471987] [] SyS_read+0xd9/0x1b0 [ 24.477147] [] ? vfs_copy_file_range+0x740/0x740 [ 24.483533] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.490345] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.496991] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 24.503923] Dumping ftrace buffer: [ 24.507438] (ftrace buffer empty) [ 24.511118] Kernel Offset: disabled [ 24.514716] Rebooting in 86400 seconds..