[....] Starting enhanced syslogd: rsyslogd[ 11.206006] audit: type=1400 audit(1515423409.769:4): avc: denied { syslog } for pid=3175 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 '10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 22.871568] ================================================================== [ 22.872701] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 22.873643] Read of size 8 at addr ffff8801ca020140 by task syzkaller586789/3330 [ 22.874624] [ 22.874855] CPU: 1 PID: 3330 Comm: syzkaller586789 Not tainted 4.9.75-g5f5e5d4 #7 [ 22.875849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.877067] ffff8801c9c87ab0 ffffffff81d93049 ffffea0007280800 ffff8801ca020140 [ 22.878203] 0000000000000000 ffff8801ca020140 ffff8801c8eea338 ffff8801c9c87ae8 [ 22.879340] ffffffff8153ca53 ffff8801ca020140 0000000000000008 0000000000000000 [ 22.880478] Call Trace: [ 22.880847] [] dump_stack+0xc1/0x128 [ 22.881599] [] print_address_description+0x73/0x280 [ 22.882609] [] kasan_report+0x275/0x360 [ 22.883380] [] ? sg_remove_request+0x103/0x120 [ 22.884229] [] __asan_report_load8_noabort+0x14/0x20 [ 22.885141] [] sg_remove_request+0x103/0x120 [ 22.886061] [] sg_finish_rem_req+0x295/0x340 [ 22.887504] [] sg_read+0xa1c/0x1440 [ 22.888531] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 22.889708] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 22.890908] [] ? fasync_helper+0x37/0xb0 [ 22.893545] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 22.900189] [] __vfs_read+0x103/0x670 [ 22.905865] [] ? default_llseek+0x290/0x290 [ 22.911819] [] ? fsnotify+0x86/0xf30 [ 22.917519] [] ? fsnotify+0xf30/0xf30 [ 22.922936] [] ? avc_policy_seqno+0x9/0x20 [ 22.928785] [] ? selinux_file_permission+0x82/0x460 [ 22.935415] [] ? security_file_permission+0x89/0x1e0 [ 22.942492] [] ? rw_verify_area+0xe5/0x2b0 [ 22.948341] [] vfs_read+0x11e/0x380 [ 22.953584] [] SyS_read+0xd9/0x1b0 [ 22.958745] [] ? vfs_copy_file_range+0x740/0x740 [ 22.966942] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 22.974004] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 22.980551] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 22.987092] [ 22.988686] Allocated by task 0: [ 22.992012] (stack is not available) [ 22.995686] [ 22.997278] Freed by task 0: [ 23.000257] (stack is not available) [ 23.003931] [ 23.005523] The buggy address belongs to the object at ffff8801ca020100 [ 23.005523] which belongs to the cache fasync_cache of size 96 [ 23.018146] The buggy address is located 64 bytes inside of [ 23.018146] 96-byte region [ffff8801ca020100, ffff8801ca020160) [ 23.029811] The buggy address belongs to the page: [ 23.034706] page:ffffea0007280800 count:1 mapcount:0 mapping: (null) index:0x0 [ 23.042930] flags: 0x8000000000000080(slab) [ 23.047220] page dumped because: kasan: bad access detected [ 23.052890] [ 23.054481] Memory state around the buggy address: [ 23.059376] ffff8801ca020000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 23.068615] ffff8801ca020080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.076113] >ffff8801ca020100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.083440] ^ [ 23.088864] ffff8801ca020180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.096188] ffff8801ca020200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.103685] ================================================================== [ 23.111014] Disabling lock debugging due to kernel taint [ 23.116869] Kernel panic - not syncing: panic_on_warn set ... [ 23.116869] [ 23.124216] CPU: 1 PID: 3330 Comm: syzkaller586789 Tainted: G B 4.9.75-g5f5e5d4 #7 [ 23.133018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.142952] ffff8801c9c87a08 ffffffff81d93049 ffffffff84195be7 ffff8801c9c87ae0 [ 23.150897] 0000000000000000 ffff8801ca020140 ffff8801c8eea338 ffff8801c9c87ad0 [ 23.158849] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5 [ 23.166810] Call Trace: [ 23.169367] [] dump_stack+0xc1/0x128 [ 23.174695] [] panic+0x1bc/0x3a8 [ 23.179681] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 23.187882] [] ? preempt_schedule+0x25/0x30 [ 23.193820] [] ? ___preempt_schedule+0x16/0x18 [ 23.200024] [] kasan_end_report+0x50/0x50 [ 23.205785] [] kasan_report+0x167/0x360 [ 23.211373] [] ? sg_remove_request+0x103/0x120 [ 23.217569] [] __asan_report_load8_noabort+0x14/0x20 [ 23.224284] [] sg_remove_request+0x103/0x120 [ 23.230336] [] sg_finish_rem_req+0x295/0x340 [ 23.236377] [] sg_read+0xa1c/0x1440 [ 23.241625] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.248257] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 23.255240] [] ? fasync_helper+0x37/0xb0 [ 23.260923] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.267553] [] __vfs_read+0x103/0x670 [ 23.272972] [] ? default_llseek+0x290/0x290 [ 23.278916] [] ? fsnotify+0x86/0xf30 [ 23.284265] [] ? fsnotify+0xf30/0xf30 [ 23.289686] [] ? avc_policy_seqno+0x9/0x20 [ 23.295534] [] ? selinux_file_permission+0x82/0x460 [ 23.302164] [] ? security_file_permission+0x89/0x1e0 [ 23.308882] [] ? rw_verify_area+0xe5/0x2b0 [ 23.314912] [] vfs_read+0x11e/0x380 [ 23.320502] [] SyS_read+0xd9/0x1b0 [ 23.325659] [] ? vfs_copy_file_range+0x740/0x740 [ 23.332038] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 23.338844] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 23.345388] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 23.352729] Dumping ftrace buffer: [ 23.356239] (ftrace buffer empty) [ 23.359913] Kernel Offset: disabled [ 23.363505] Rebooting in 86400 seconds..