[....] Starting enhanced syslogd: rsyslogd[ 11.187020] audit: type=1400 audit(1515587676.168:4): avc: denied { syslog } for pid=3173 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 '10.128.15.202' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.402091] ================================================================== [ 19.409457] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 19.416521] Read of size 8 at addr ffff8801c914f140 by task syzkaller815997/3321 [ 19.424018] [ 19.425612] CPU: 1 PID: 3321 Comm: syzkaller815997 Not tainted 4.9.76-g9154940 #10 [ 19.433283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.442608] ffff8801c855f9b0 ffffffff81d93149 ffffea00072453c0 ffff8801c914f140 [ 19.450555] 0000000000000000 ffff8801c914f140 ffff8801cfba8238 ffff8801c855f9e8 [ 19.458504] ffffffff8153cb43 ffff8801c914f140 0000000000000008 0000000000000000 [ 19.466451] Call Trace: [ 19.469007] [] dump_stack+0xc1/0x128 [ 19.474337] [] print_address_description+0x73/0x280 [ 19.480965] [] kasan_report+0x275/0x360 [ 19.486562] [] ? sg_remove_request+0x103/0x120 [ 19.492765] [] __asan_report_load8_noabort+0x14/0x20 [ 19.499486] [] sg_remove_request+0x103/0x120 [ 19.505506] [] sg_finish_rem_req+0x295/0x340 [ 19.511532] [] sg_read+0xa1c/0x1440 [ 19.516773] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.523405] [] ? fsnotify+0xf30/0xf30 [ 19.528823] [] ? avc_policy_seqno+0x9/0x20 [ 19.534672] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.541649] [] ? security_file_permission+0x89/0x1e0 [ 19.548363] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.554992] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.561621] [] do_readv_writev+0x520/0x750 [ 19.567469] [] ? vfs_write+0x530/0x530 [ 19.572971] [] ? _raw_spin_unlock+0x2c/0x50 [ 19.578908] [] ? __pmd_alloc+0x410/0x410 [ 19.584587] [] ? dev_seq_stop+0x50/0x50 [ 19.590182] [] ? __do_page_fault+0x5ec/0xd40 [ 19.596204] [] vfs_readv+0x84/0xc0 [ 19.601358] [] do_readv+0xe6/0x250 [ 19.606509] [] ? vfs_readv+0xc0/0xc0 [ 19.611837] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 19.618468] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.625271] [] SyS_readv+0x27/0x30 [ 19.630434] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 19.636973] [ 19.638565] Allocated by task 0: [ 19.641896] (stack is not available) [ 19.645568] [ 19.647162] Freed by task 0: [ 19.650141] (stack is not available) [ 19.653811] [ 19.655402] The buggy address belongs to the object at ffff8801c914f100 [ 19.655402] which belongs to the cache fasync_cache of size 96 [ 19.668018] The buggy address is located 64 bytes inside of [ 19.668018] 96-byte region [ffff8801c914f100, ffff8801c914f160) [ 19.679681] The buggy address belongs to the page: [ 19.684573] page:ffffea00072453c0 count:1 mapcount:0 mapping: (null) index:0x0 [ 19.692784] flags: 0x8000000000000080(slab) [ 19.697064] page dumped because: kasan: bad access detected [ 19.702733] [ 19.704321] Memory state around the buggy address: [ 19.709214] ffff8801c914f000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 19.716534] ffff8801c914f080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.723853] >ffff8801c914f100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.731180] ^ [ 19.736590] ffff8801c914f180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.743917] ffff8801c914f200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.751236] ================================================================== [ 19.758554] Disabling lock debugging due to kernel taint [ 19.764423] Kernel panic - not syncing: panic_on_warn set ... [ 19.764423] [ 19.771764] CPU: 1 PID: 3321 Comm: syzkaller815997 Tainted: G B 4.9.76-g9154940 #10 [ 19.780649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.789968] ffff8801c855f908 ffffffff81d93149 ffffffff84195c17 ffff8801c855f9e0 [ 19.797907] 0000000000000000 ffff8801c914f140 ffff8801cfba8238 ffff8801c855f9d0 [ 19.805853] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5 [ 19.813794] Call Trace: [ 19.816347] [] dump_stack+0xc1/0x128 [ 19.821677] [] panic+0x1bc/0x3a8 [ 19.826663] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 19.834857] [] ? preempt_schedule+0x25/0x30 [ 19.840801] [] ? ___preempt_schedule+0x16/0x18 [ 19.846998] [] kasan_end_report+0x50/0x50 [ 19.852760] [] kasan_report+0x167/0x360 [ 19.858347] [] ? sg_remove_request+0x103/0x120 [ 19.864541] [] __asan_report_load8_noabort+0x14/0x20 [ 19.871260] [] sg_remove_request+0x103/0x120 [ 19.877281] [] sg_finish_rem_req+0x295/0x340 [ 19.883303] [] sg_read+0xa1c/0x1440 [ 19.888544] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.895174] [] ? fsnotify+0xf30/0xf30 [ 19.900589] [] ? avc_policy_seqno+0x9/0x20 [ 19.906439] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.913421] [] ? security_file_permission+0x89/0x1e0 [ 19.920136] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.926763] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.933394] [] do_readv_writev+0x520/0x750 [ 19.939243] [] ? vfs_write+0x530/0x530 [ 19.944750] [] ? _raw_spin_unlock+0x2c/0x50 [ 19.950686] [] ? __pmd_alloc+0x410/0x410 [ 19.956359] [] ? dev_seq_stop+0x50/0x50 [ 19.961949] [] ? __do_page_fault+0x5ec/0xd40 [ 19.967971] [] vfs_readv+0x84/0xc0 [ 19.973125] [] do_readv+0xe6/0x250 [ 19.978276] [] ? vfs_readv+0xc0/0xc0 [ 19.983613] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 19.990247] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.997052] [] SyS_readv+0x27/0x30 [ 20.002206] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 20.008783] Dumping ftrace buffer: [ 20.012287] (ftrace buffer empty) [ 20.015960] Kernel Offset: disabled [ 20.019555] Rebooting in 86400 seconds..