[   32.355866] audit: type=1800 audit(1579752997.427:33): pid=7155 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0
[   32.383153] audit: type=1800 audit(1579752997.427:34): pid=7155 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   37.447156] random: sshd: uninitialized urandom read (32 bytes read)
[   37.689472] audit: type=1400 audit(1579753002.757:35): avc:  denied  { map } for  pid=7328 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
[   37.740478] random: sshd: uninitialized urandom read (32 bytes read)
[   38.444107] random: sshd: uninitialized urandom read (32 bytes read)
[   38.640742] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.247' (ECDSA) to the list of known hosts.
[   44.201509] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
[   44.324488] audit: type=1400 audit(1579753009.397:36): avc:  denied  { map } for  pid=7341 comm="syz-executor246" path="/root/syz-executor246586663" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   44.396475] ==================================================================
[   44.396498] BUG: KASAN: use-after-free in con_shutdown+0x85/0x90
[   44.396503] Write of size 8 at addr ffff888098709848 by task syz-executor246/7354
[   44.396506] 
[   44.396513] CPU: 0 PID: 7354 Comm: syz-executor246 Not tainted 4.14.166-syzkaller #0
[   44.396517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.396519] Call Trace:
[   44.396530]  dump_stack+0x142/0x197
[   44.396538]  ? con_shutdown+0x85/0x90
[   44.396548]  print_address_description.cold+0x7c/0x1dc
[   44.396556]  ? con_shutdown+0x85/0x90
[   44.396564]  kasan_report.cold+0xa9/0x2af
[   44.396570]  ? set_palette+0x140/0x140
[   44.396578]  __asan_report_store8_noabort+0x17/0x20
[   44.396584]  con_shutdown+0x85/0x90
[   44.396593]  release_tty+0xbf/0x7c0
[   44.396602]  tty_release_struct+0x3c/0x50
[   44.396611]  tty_release+0xaa3/0xd60
[   44.396623]  ? tty_release_struct+0x50/0x50
[   44.396630]  __fput+0x275/0x7a0
[   44.396643]  ____fput+0x16/0x20
[   44.396651]  task_work_run+0x114/0x190
[   44.396663]  do_exit+0xa1a/0x2cd0
[   44.396676]  ? mm_update_next_owner+0x5d0/0x5d0
[   44.396689]  ? up_read+0x1a/0x40
[   44.396696]  ? __do_page_fault+0x358/0xb80
[   44.396705]  do_group_exit+0x111/0x330
[   44.396715]  SyS_exit_group+0x1d/0x20
[   44.396721]  ? do_group_exit+0x330/0x330
[   44.396731]  do_syscall_64+0x1e8/0x640
[   44.396739]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   44.396753]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   44.396759] RIP: 0033:0x43ff38
[   44.396763] RSP: 002b:00007ffc60e12718 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   44.396772] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff38
[   44.396776] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   44.396780] RBP: 00000000004bf950 R08: 00000000000000e7 R09: ffffffffffffffd0
[   44.396784] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
[   44.396789] R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000
[   44.396803] 
[   44.396807] Allocated by task 7354:
[   44.396815]  save_stack_trace+0x16/0x20
[   44.396821]  save_stack+0x45/0xd0
[   44.396826]  kasan_kmalloc+0xce/0xf0
[   44.396832]  kmem_cache_alloc_trace+0x152/0x790
[   44.396837]  vc_allocate+0x148/0x580
[   44.396851]  con_install+0x52/0x400
[   44.396857]  tty_init_dev+0xea/0x3a0
[   44.396862]  tty_open+0x414/0xa10
[   44.396869]  chrdev_open+0x207/0x590
[   44.396876]  do_dentry_open+0x73b/0xeb0
[   44.396883]  vfs_open+0x105/0x220
[   44.396889]  path_openat+0x8bd/0x3f70
[   44.396896]  do_filp_open+0x18e/0x250
[   44.396902]  do_sys_open+0x2c5/0x430
[   44.396908]  SyS_open+0x2d/0x40
[   44.396914]  do_syscall_64+0x1e8/0x640
[   44.396920]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   44.396922] 
[   44.396925] Freed by task 7355:
[   44.396931]  save_stack_trace+0x16/0x20
[   44.396937]  save_stack+0x45/0xd0
[   44.396943]  kasan_slab_free+0x75/0xc0
[   44.396947]  kfree+0xcc/0x270
[   44.396954]  vt_disallocate_all+0x286/0x380
[   44.396960]  vt_ioctl+0x76b/0x2170
[   44.396966]  tty_ioctl+0x841/0x1320
[   44.396972]  do_vfs_ioctl+0x7ae/0x1060
[   44.396977]  SyS_ioctl+0x8f/0xc0
[   44.396983]  do_syscall_64+0x1e8/0x640
[   44.396990]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   44.396992] 
[   44.396998] The buggy address belongs to the object at ffff888098709740
[   44.396998]  which belongs to the cache kmalloc-2048 of size 2048
[   44.397004] The buggy address is located 264 bytes inside of
[   44.397004]  2048-byte region [ffff888098709740, ffff888098709f40)
[   44.397007] The buggy address belongs to the page:
[   44.397013] page:ffffea000261c200 count:1 mapcount:0 mapping:ffff888098708640 index:0x0 compound_mapcount: 0
[   44.397024] flags: 0xfffe0000008100(slab|head)
[   44.397033] raw: 00fffe0000008100 ffff888098708640 0000000000000000 0000000100000003
[   44.397041] raw: ffffea00020319a0 ffffea00026167a0 ffff8880aa800c40 0000000000000000
[   44.397044] page dumped because: kasan: bad access detected
[   44.397046] 
[   44.397049] Memory state around the buggy address:
[   44.397055]  ffff888098709700: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
[   44.397060]  ffff888098709780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.397065] >ffff888098709800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.397069]                                               ^
[   44.397074]  ffff888098709880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.397080]  ffff888098709900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.397083] ==================================================================
[   44.397086] Disabling lock debugging due to kernel taint
[   44.397161] Kernel panic - not syncing: panic_on_warn set ...
[   44.397161] 
[   44.397168] CPU: 0 PID: 7354 Comm: syz-executor246 Tainted: G    B           4.14.166-syzkaller #0
[   44.397172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.397174] Call Trace:
[   44.397183]  dump_stack+0x142/0x197
[   44.397191]  ? con_shutdown+0x85/0x90
[   44.397198]  panic+0x1f9/0x42d
[   44.397203]  ? add_taint.cold+0x16/0x16
[   44.397211]  ? ___preempt_schedule+0x16/0x18
[   44.397220]  kasan_end_report+0x47/0x4f
[   44.397227]  kasan_report.cold+0x130/0x2af
[   44.397233]  ? set_palette+0x140/0x140
[   44.397240]  __asan_report_store8_noabort+0x17/0x20
[   44.397246]  con_shutdown+0x85/0x90
[   44.397253]  release_tty+0xbf/0x7c0
[   44.397261]  tty_release_struct+0x3c/0x50
[   44.397268]  tty_release+0xaa3/0xd60
[   44.397278]  ? tty_release_struct+0x50/0x50
[   44.397283]  __fput+0x275/0x7a0
[   44.397292]  ____fput+0x16/0x20
[   44.397299]  task_work_run+0x114/0x190
[   44.397307]  do_exit+0xa1a/0x2cd0
[   44.397317]  ? mm_update_next_owner+0x5d0/0x5d0
[   44.397326]  ? up_read+0x1a/0x40
[   44.397332]  ? __do_page_fault+0x358/0xb80
[   44.397339]  do_group_exit+0x111/0x330
[   44.397345]  SyS_exit_group+0x1d/0x20
[   44.397351]  ? do_group_exit+0x330/0x330
[   44.397357]  do_syscall_64+0x1e8/0x640
[   44.397363]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   44.397372]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   44.397377] RIP: 0033:0x43ff38
[   44.397381] RSP: 002b:00007ffc60e12718 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   44.397388] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff38
[   44.397392] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   44.397396] RBP: 00000000004bf950 R08: 00000000000000e7 R09: ffffffffffffffd0
[   44.397400] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
[   44.397403] R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000
[   44.398775] Kernel Offset: disabled