[....] Starting enhanced syslogd: rsyslogd[ 9.758358] audit: type=1400 audit(1515506941.395:4): avc: denied { syslog } for pid=3164 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 '10.128.15.207' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 21.610190] ================================================================== [ 21.611326] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 21.612257] Read of size 8 at addr ffff8801c9051140 by task syzkaller091584/3324 [ 21.613263] [ 21.613504] CPU: 0 PID: 3324 Comm: syzkaller091584 Not tainted 4.9.75-g8910fa5 #9 [ 21.614499] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.615734] ffff8801c8687ab0 ffffffff81d93049 ffffea0007241440 ffff8801c9051140 [ 21.616862] 0000000000000000 ffff8801c9051140 ffff8801c84da338 ffff8801c8687ae8 [ 21.617995] ffffffff8153ca53 ffff8801c9051140 0000000000000008 0000000000000000 [ 21.619131] Call Trace: [ 21.619487] [] dump_stack+0xc1/0x128 [ 21.620198] [] print_address_description+0x73/0x280 [ 21.621088] [] kasan_report+0x275/0x360 [ 21.621831] [] ? sg_remove_request+0x103/0x120 [ 21.622650] [] __asan_report_load8_noabort+0x14/0x20 [ 21.623538] [] sg_remove_request+0x103/0x120 [ 21.624345] [] sg_finish_rem_req+0x295/0x340 [ 21.625141] [] sg_read+0xa1c/0x1440 [ 21.625839] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.626729] [] ? fasync_insert_entry+0x147/0x2e0 [ 21.627570] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.628444] [] __vfs_read+0x103/0x670 [ 21.629164] [] ? default_llseek+0x290/0x290 [ 21.629953] [] ? fsnotify+0x86/0xf30 [ 21.633033] [] ? fsnotify+0xf30/0xf30 [ 21.638449] [] ? avc_policy_seqno+0x9/0x20 [ 21.644297] [] ? selinux_file_permission+0x82/0x460 [ 21.650950] [] ? security_file_permission+0x89/0x1e0 [ 21.657670] [] ? rw_verify_area+0xe5/0x2b0 [ 21.663519] [] vfs_read+0x11e/0x380 [ 21.668763] [] SyS_read+0xd9/0x1b0 [ 21.673915] [] ? vfs_copy_file_range+0x740/0x740 [ 21.680297] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 21.687102] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 21.693646] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 21.700187] [ 21.701780] Allocated by task 0: [ 21.705107] (stack is not available) [ 21.708781] [ 21.710371] Freed by task 0: [ 21.713351] (stack is not available) [ 21.717537] [ 21.719131] The buggy address belongs to the object at ffff8801c9051100 [ 21.719131] which belongs to the cache fasync_cache of size 96 [ 21.731749] The buggy address is located 64 bytes inside of [ 21.731749] 96-byte region [ffff8801c9051100, ffff8801c9051160) [ 21.743411] The buggy address belongs to the page: [ 21.748303] page:ffffea0007241440 count:1 mapcount:0 mapping: (null) index:0x0 [ 21.756518] flags: 0x8000000000000080(slab) [ 21.760805] page dumped because: kasan: bad access detected [ 21.766475] [ 21.768065] Memory state around the buggy address: [ 21.772955] ffff8801c9051000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 21.780278] ffff8801c9051080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.787600] >ffff8801c9051100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.794921] ^ [ 21.800336] ffff8801c9051180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.807661] ffff8801c9051200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.814981] ================================================================== [ 21.822302] Disabling lock debugging due to kernel taint [ 21.827985] Kernel panic - not syncing: panic_on_warn set ... [ 21.827985] [ 21.835343] CPU: 0 PID: 3324 Comm: syzkaller091584 Tainted: G B 4.9.75-g8910fa5 #9 [ 21.844145] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.853466] ffff8801c8687a08 ffffffff81d93049 ffffffff84195be7 ffff8801c8687ae0 [ 21.861426] 0000000000000000 ffff8801c9051140 ffff8801c84da338 ffff8801c8687ad0 [ 21.869367] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5 [ 21.877315] Call Trace: [ 21.879867] [] dump_stack+0xc1/0x128 [ 21.885197] [] panic+0x1bc/0x3a8 [ 21.890178] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 21.898372] [] ? preempt_schedule+0x25/0x30 [ 21.904312] [] ? ___preempt_schedule+0x16/0x18 [ 21.910512] [] kasan_end_report+0x50/0x50 [ 21.916275] [] kasan_report+0x167/0x360 [ 21.921861] [] ? sg_remove_request+0x103/0x120 [ 21.928056] [] __asan_report_load8_noabort+0x14/0x20 [ 21.934772] [] sg_remove_request+0x103/0x120 [ 21.940795] [] sg_finish_rem_req+0x295/0x340 [ 21.946823] [] sg_read+0xa1c/0x1440 [ 21.952062] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.958697] [] ? fasync_insert_entry+0x147/0x2e0 [ 21.965064] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.971693] [] __vfs_read+0x103/0x670 [ 21.977106] [] ? default_llseek+0x290/0x290 [ 21.983042] [] ? fsnotify+0x86/0xf30 [ 21.988368] [] ? fsnotify+0xf30/0xf30 [ 21.993782] [] ? avc_policy_seqno+0x9/0x20 [ 21.999628] [] ? selinux_file_permission+0x82/0x460 [ 22.006263] [] ? security_file_permission+0x89/0x1e0 [ 22.012982] [] ? rw_verify_area+0xe5/0x2b0 [ 22.018831] [] vfs_read+0x11e/0x380 [ 22.024070] [] SyS_read+0xd9/0x1b0 [ 22.029225] [] ? vfs_copy_file_range+0x740/0x740 [ 22.035596] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 22.042398] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 22.048942] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 22.055921] Dumping ftrace buffer: [ 22.059427] (ftrace buffer empty) [ 22.063100] Kernel Offset: disabled [ 22.066697] Rebooting in 86400 seconds..