[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 48.715621][ T26] audit: type=1800 audit(1582964195.519:25): pid=8565 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 48.735027][ T26] audit: type=1800 audit(1582964195.519:26): pid=8565 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 48.785474][ T26] audit: type=1800 audit(1582964195.519:27): pid=8565 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?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 '10.128.10.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 58.801516][ T8716] ================================================================== [ 58.801550][ T8716] BUG: KASAN: slab-out-of-bounds in soft_cursor+0x40d/0xdc0 [ 58.801556][ T8716] Read of size 64 at addr ffff888094d35950 by task syz-executor737/8716 [ 58.801557][ T8716] [ 58.801565][ T8716] CPU: 0 PID: 8716 Comm: syz-executor737 Not tainted 5.6.0-rc3-syzkaller #0 [ 58.801568][ T8716] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.801571][ T8716] Call Trace: [ 58.801580][ T8716] dump_stack+0x1fb/0x318 [ 58.801592][ T8716] print_address_description+0x74/0x5c0 [ 58.801598][ T8716] ? vprintk_default+0x28/0x30 [ 58.801605][ T8716] ? vprintk_func+0x158/0x170 [ 58.801613][ T8716] ? printk+0x62/0x8d [ 58.801625][ T8716] __kasan_report+0x149/0x1c0 [ 58.801633][ T8716] ? soft_cursor+0x40d/0xdc0 [ 58.801642][ T8716] kasan_report+0x26/0x50 [ 58.801647][ T8716] ? trace_kmalloc+0xcd/0x130 [ 58.801654][ T8716] check_memory_region+0x2b6/0x2f0 [ 58.801659][ T8716] ? soft_cursor+0x40d/0xdc0 [ 58.801666][ T8716] memcpy+0x28/0x60 [ 58.801674][ T8716] soft_cursor+0x40d/0xdc0 [ 58.801689][ T8716] bit_cursor+0x1930/0x23a0 [ 58.801716][ T8716] ? fbcon_add_cursor_timer+0xdb/0x2c0 [ 58.801727][ T8716] fbcon_cursor+0x8a4/0xc40 [ 58.801735][ T8716] ? bit_clear_margins+0x620/0x620 [ 58.801745][ T8716] hide_cursor+0xa7/0x360 [ 58.801755][ T8716] redraw_screen+0x163/0x1830 [ 58.801766][ T8716] ? mutex_unlock+0xd/0x10 [ 58.801776][ T8716] vc_do_resize+0x12af/0x1af0 [ 58.801806][ T8716] vc_resize+0x4f/0x60 [ 58.801814][ T8716] vt_ioctl+0x2f6d/0x3a30 [ 58.801833][ T8716] ? rcu_lock_release+0x9/0x30 [ 58.801847][ T8716] ? tomoyo_path_number_perm+0x58f/0x690 [ 58.801869][ T8716] ? tty_jobctrl_ioctl+0x1ea/0xc00 [ 58.801881][ T8716] tty_ioctl+0xee6/0x15c0 [ 58.801886][ T8716] ? assoc_array_gc+0x1371/0x1420 [ 58.801898][ T8716] ? tomoyo_file_ioctl+0x23/0x30 [ 58.801906][ T8716] ? tty_do_resize+0x180/0x180 [ 58.801914][ T8716] __se_sys_ioctl+0x113/0x190 [ 58.801924][ T8716] __x64_sys_ioctl+0x7b/0x90 [ 58.801933][ T8716] do_syscall_64+0xf7/0x1c0 [ 58.801942][ T8716] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.801948][ T8716] RIP: 0033:0x440269 [ 58.801955][ T8716] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 58.801959][ T8716] RSP: 002b:00007ffd896a1588 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 58.801964][ T8716] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 58.801968][ T8716] RDX: 0000000020000080 RSI: 000000000000560a RDI: 0000000000000004 [ 58.801971][ T8716] RBP: 00000000006cb018 R08: 0000000000000001 R09: 00000000004002c8 [ 58.801974][ T8716] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000401b50 [ 58.801978][ T8716] R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 [ 58.801992][ T8716] [ 58.801995][ T8716] Allocated by task 8716: [ 58.802001][ T8716] __kasan_kmalloc+0x118/0x1c0 [ 58.802005][ T8716] kasan_kmalloc+0x9/0x10 [ 58.802009][ T8716] __kmalloc+0x254/0x340 [ 58.802014][ T8716] fbcon_set_font+0x2de/0x990 [ 58.802018][ T8716] con_font_op+0xeb9/0x1620 [ 58.802022][ T8716] vt_ioctl+0x23b7/0x3a30 [ 58.802026][ T8716] tty_ioctl+0xee6/0x15c0 [ 58.802031][ T8716] __se_sys_ioctl+0x113/0x190 [ 58.802039][ T8716] __x64_sys_ioctl+0x7b/0x90 [ 58.802044][ T8716] do_syscall_64+0xf7/0x1c0 [ 58.802048][ T8716] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.802050][ T8716] [ 58.802053][ T8716] Freed by task 8462: [ 58.802058][ T8716] __kasan_slab_free+0x12e/0x1e0 [ 58.802062][ T8716] kasan_slab_free+0xe/0x10 [ 58.802066][ T8716] kfree+0x10d/0x220 [ 58.802076][ T8716] tomoyo_init_log+0x1d58/0x1e30 [ 58.802081][ T8716] tomoyo_supervisor+0x2c3/0x1310 [ 58.802085][ T8716] tomoyo_env_perm+0x11c/0x1a0 [ 58.802089][ T8716] tomoyo_find_next_domain+0x161f/0x1cc0 [ 58.802093][ T8716] tomoyo_bprm_check_security+0xe3/0x130 [ 58.802100][ T8716] security_bprm_check+0x50/0xb0 [ 58.802106][ T8716] search_binary_handler+0x6a/0x5e0 [ 58.802110][ T8716] __do_execve_file+0x153b/0x1ca0 [ 58.802115][ T8716] __x64_sys_execve+0x94/0xb0 [ 58.802119][ T8716] do_syscall_64+0xf7/0x1c0 [ 58.802124][ T8716] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.802126][ T8716] [ 58.802130][ T8716] The buggy address belongs to the object at ffff888094d34000 [ 58.802130][ T8716] which belongs to the cache kmalloc-8k of size 8192 [ 58.802134][ T8716] The buggy address is located 6480 bytes inside of [ 58.802134][ T8716] 8192-byte region [ffff888094d34000, ffff888094d36000) [ 58.802136][ T8716] The buggy address belongs to the page: [ 58.802144][ T8716] page:ffffea0002534d00 refcount:1 mapcount:0 mapping:ffff8880aa4021c0 index:0x0 compound_mapcount: 0 [ 58.802149][ T8716] flags: 0xfffe0000010200(slab|head) [ 58.802156][ T8716] raw: 00fffe0000010200 ffffea00029e2c08 ffffea0002519b08 ffff8880aa4021c0 [ 58.802161][ T8716] raw: 0000000000000000 ffff888094d34000 0000000100000001 0000000000000000 [ 58.802164][ T8716] page dumped because: kasan: bad access detected [ 58.802165][ T8716] [ 58.802167][ T8716] Memory state around the buggy address: [ 58.802171][ T8716] ffff888094d35800: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 58.802175][ T8716] ffff888094d35880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 58.802179][ T8716] >ffff888094d35900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 58.802181][ T8716] ^ [ 58.802185][ T8716] ffff888094d35980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 58.802189][ T8716] ffff888094d35a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 58.802191][ T8716] ================================================================== [ 58.802193][ T8716] Disabling lock debugging due to kernel taint [ 58.802197][ T8716] Kernel panic - not syncing: panic_on_warn set ... [ 58.802202][ T8716] CPU: 0 PID: 8716 Comm: syz-executor737 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 58.802205][ T8716] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.802206][ T8716] Call Trace: [ 58.802212][ T8716] dump_stack+0x1fb/0x318 [ 58.802220][ T8716] panic+0x264/0x7a9 [ 58.802224][ T8716] ? _raw_spin_unlock_irqrestore+0x72/0xe0 [ 58.802228][ T8716] ? __kasan_report+0x193/0x1c0 [ 58.802235][ T8716] ? trace_hardirqs_on+0x34/0x80 [ 58.802243][ T8716] __kasan_report+0x1b9/0x1c0 [ 58.802249][ T8716] ? soft_cursor+0x40d/0xdc0 [ 58.802255][ T8716] kasan_report+0x26/0x50 [ 58.802259][ T8716] ? trace_kmalloc+0xcd/0x130 [ 58.802265][ T8716] check_memory_region+0x2b6/0x2f0 [ 58.802269][ T8716] ? soft_cursor+0x40d/0xdc0 [ 58.802274][ T8716] memcpy+0x28/0x60 [ 58.802280][ T8716] soft_cursor+0x40d/0xdc0 [ 58.802290][ T8716] bit_cursor+0x1930/0x23a0 [ 58.802305][ T8716] ? fbcon_add_cursor_timer+0xdb/0x2c0 [ 58.802313][ T8716] fbcon_cursor+0x8a4/0xc40 [ 58.802319][ T8716] ? bit_clear_margins+0x620/0x620 [ 58.802325][ T8716] hide_cursor+0xa7/0x360 [ 58.802332][ T8716] redraw_screen+0x163/0x1830 [ 58.802339][ T8716] ? mutex_unlock+0xd/0x10 [ 58.802345][ T8716] vc_do_resize+0x12af/0x1af0 [ 58.802362][ T8716] vc_resize+0x4f/0x60 [ 58.802368][ T8716] vt_ioctl+0x2f6d/0x3a30 [ 58.802378][ T8716] ? rcu_lock_release+0x9/0x30 [ 58.802388][ T8716] ? tomoyo_path_number_perm+0x58f/0x690 [ 58.802401][ T8716] ? tty_jobctrl_ioctl+0x1ea/0xc00 [ 58.802408][ T8716] tty_ioctl+0xee6/0x15c0 [ 58.802412][ T8716] ? assoc_array_gc+0x1371/0x1420 [ 58.802420][ T8716] ? tomoyo_file_ioctl+0x23/0x30 [ 58.802426][ T8716] ? tty_do_resize+0x180/0x180 [ 58.802431][ T8716] __se_sys_ioctl+0x113/0x190 [ 58.802445][ T8716] __x64_sys_ioctl+0x7b/0x90 [ 58.802452][ T8716] do_syscall_64+0xf7/0x1c0 [ 58.802458][ T8716] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.802462][ T8716] RIP: 0033:0x440269 [ 58.802466][ T8716] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 58.802469][ T8716] RSP: 002b:00007ffd896a1588 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 58.802474][ T8716] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 58.802476][ T8716] RDX: 0000000020000080 RSI: 000000000000560a RDI: 0000000000000004 [ 58.802479][ T8716] RBP: 00000000006cb018 R08: 0000000000000001 R09: 00000000004002c8 [ 58.802482][ T8716] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000401b50 [ 58.802485][ T8716] R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 [ 58.803760][ T8716] Kernel Offset: disabled [ 59.624351][ T8716] Rebooting in 86400 seconds..