[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 71.198767][ T26] audit: type=1800 audit(1576914183.356:25): pid=9157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 71.223531][ T26] audit: type=1800 audit(1576914183.356:26): pid=9157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 71.276004][ T26] audit: type=1800 audit(1576914183.356:27): pid=9157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.0.98' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 99.645488][ T9308] ================================================================== [ 99.645529][ T9308] BUG: KASAN: global-out-of-bounds in fb_pad_aligned_buffer+0x138/0x160 [ 99.645537][ T9308] Read of size 1 at addr ffffffff8872bc7c by task syz-executor150/9308 [ 99.645539][ T9308] [ 99.645549][ T9308] CPU: 1 PID: 9308 Comm: syz-executor150 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 99.645555][ T9308] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.645558][ T9308] Call Trace: [ 99.645568][ T9308] dump_stack+0x197/0x210 [ 99.645578][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.645591][ T9308] print_address_description.constprop.0.cold+0x5/0x30b [ 99.645600][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.645609][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.645618][ T9308] __kasan_report.cold+0x1b/0x41 [ 99.645629][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.645639][ T9308] kasan_report+0x12/0x20 [ 99.645648][ T9308] __asan_report_load1_noabort+0x14/0x20 [ 99.645658][ T9308] fb_pad_aligned_buffer+0x138/0x160 [ 99.645671][ T9308] bit_putcs+0xd14/0xf10 [ 99.645690][ T9308] ? bit_cursor+0x1a60/0x1a60 [ 99.645702][ T9308] ? write_comp_data+0x21/0x70 [ 99.645709][ T9308] ? fb_get_color_depth.part.0+0xcf/0x200 [ 99.645721][ T9308] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 99.645732][ T9308] fbcon_putcs+0x33c/0x3e0 [ 99.645741][ T9308] ? bit_cursor+0x1a60/0x1a60 [ 99.645752][ T9308] do_update_region+0x42b/0x6f0 [ 99.645764][ T9308] ? con_get_trans_old+0x2a0/0x2a0 [ 99.645774][ T9308] ? fbcon_set_palette+0x3c4/0x4a0 [ 99.645783][ T9308] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.645791][ T9308] ? var_to_display+0x810/0x810 [ 99.645801][ T9308] redraw_screen+0x676/0x7d0 [ 99.645811][ T9308] ? respond_string+0x2c0/0x2c0 [ 99.645825][ T9308] fbcon_do_set_font+0x829/0x960 [ 99.645837][ T9308] fbcon_copy_font+0x12c/0x190 [ 99.645845][ T9308] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.645853][ T9308] ? fbcon_do_set_font+0x960/0x960 [ 99.645862][ T9308] con_font_op+0x6b2/0x1270 [ 99.645874][ T9308] ? lock_downgrade+0x920/0x920 [ 99.645883][ T9308] ? con_write+0xd0/0xd0 [ 99.645898][ T9308] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 99.645909][ T9308] ? _copy_from_user+0x12c/0x1a0 [ 99.645919][ T9308] vt_ioctl+0x181a/0x26d0 [ 99.645932][ T9308] ? complete_change_console+0x3a0/0x3a0 [ 99.645944][ T9308] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 99.645957][ T9308] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 99.645967][ T9308] ? tty_jobctrl_ioctl+0x50/0xd40 [ 99.645978][ T9308] ? complete_change_console+0x3a0/0x3a0 [ 99.645986][ T9308] tty_ioctl+0xa37/0x14f0 [ 99.645995][ T9308] ? tty_vhangup+0x30/0x30 [ 99.646004][ T9308] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 99.646013][ T9308] ? do_vfs_ioctl+0x11b/0x1340 [ 99.646023][ T9308] ? ioctl_file_clone+0x180/0x180 [ 99.646031][ T9308] ? file_open_root+0x5f0/0x5f0 [ 99.646044][ T9308] ? __kasan_check_write+0x14/0x20 [ 99.646053][ T9308] ? up_read+0x1cd/0x810 [ 99.646065][ T9308] ? tomoyo_file_ioctl+0x23/0x30 [ 99.646074][ T9308] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.646084][ T9308] ? security_file_ioctl+0x8d/0xc0 [ 99.646091][ T9308] ? tty_vhangup+0x30/0x30 [ 99.646100][ T9308] ksys_ioctl+0x123/0x180 [ 99.646110][ T9308] __x64_sys_ioctl+0x73/0xb0 [ 99.646122][ T9308] do_syscall_64+0xfa/0x790 [ 99.646132][ T9308] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.646139][ T9308] RIP: 0033:0x440269 [ 99.646148][ T9308] 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 [ 99.646153][ T9308] RSP: 002b:00007ffeb2ebb798 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 99.646161][ T9308] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 99.646166][ T9308] RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000004 [ 99.646171][ T9308] RBP: 00000000006cb018 R08: 000000000000000d R09: 00000000004002c8 [ 99.646176][ T9308] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b50 [ 99.646180][ T9308] R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 [ 99.646191][ T9308] [ 99.646194][ T9308] The buggy address belongs to the variable: [ 99.646202][ T9308] oid_index+0x93c/0xa00 [ 99.646204][ T9308] [ 99.646207][ T9308] Memory state around the buggy address: [ 99.646214][ T9308] ffffffff8872bb00: 05 fa fa fa fa fa fa fa 01 fa fa fa fa fa fa fa [ 99.646221][ T9308] ffffffff8872bb80: 00 00 02 fa fa fa fa fa 00 00 00 05 fa fa fa fa [ 99.646227][ T9308] >ffffffff8872bc00: 00 00 00 fa fa fa fa fa 00 00 00 00 00 01 fa fa [ 99.646231][ T9308] ^ [ 99.646237][ T9308] ffffffff8872bc80: fa fa fa fa 00 00 00 00 01 fa fa fa fa fa fa fa [ 99.646243][ T9308] ffffffff8872bd00: 00 00 00 00 fa fa fa fa 00 03 fa fa fa fa fa fa [ 99.646246][ T9308] ================================================================== [ 99.646249][ T9308] Disabling lock debugging due to kernel taint [ 99.646253][ T9308] Kernel panic - not syncing: panic_on_warn set ... [ 99.646262][ T9308] CPU: 1 PID: 9308 Comm: syz-executor150 Tainted: G B 5.5.0-rc2-next-20191220-syzkaller #0 [ 99.646266][ T9308] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.646268][ T9308] Call Trace: [ 99.646275][ T9308] dump_stack+0x197/0x210 [ 99.646285][ T9308] panic+0x2e3/0x75c [ 99.646292][ T9308] ? add_taint.cold+0x16/0x16 [ 99.646305][ T9308] ? trace_hardirqs_on+0x67/0x240 [ 99.646313][ T9308] ? trace_hardirqs_on+0x5e/0x240 [ 99.646322][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.646329][ T9308] end_report+0x47/0x4f [ 99.646337][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.646345][ T9308] __kasan_report.cold+0xe/0x41 [ 99.646354][ T9308] ? fb_pad_aligned_buffer+0x138/0x160 [ 99.646362][ T9308] kasan_report+0x12/0x20 [ 99.646370][ T9308] __asan_report_load1_noabort+0x14/0x20 [ 99.646378][ T9308] fb_pad_aligned_buffer+0x138/0x160 [ 99.646423][ T9308] bit_putcs+0xd14/0xf10 [ 99.646436][ T9308] ? bit_cursor+0x1a60/0x1a60 [ 99.646444][ T9308] ? write_comp_data+0x21/0x70 [ 99.646451][ T9308] ? fb_get_color_depth.part.0+0xcf/0x200 [ 99.646460][ T9308] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 99.646469][ T9308] fbcon_putcs+0x33c/0x3e0 [ 99.646477][ T9308] ? bit_cursor+0x1a60/0x1a60 [ 99.646485][ T9308] do_update_region+0x42b/0x6f0 [ 99.646493][ T9308] ? con_get_trans_old+0x2a0/0x2a0 [ 99.646502][ T9308] ? fbcon_set_palette+0x3c4/0x4a0 [ 99.646510][ T9308] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.646517][ T9308] ? var_to_display+0x810/0x810 [ 99.646525][ T9308] redraw_screen+0x676/0x7d0 [ 99.646533][ T9308] ? respond_string+0x2c0/0x2c0 [ 99.646543][ T9308] fbcon_do_set_font+0x829/0x960 [ 99.646552][ T9308] fbcon_copy_font+0x12c/0x190 [ 99.646560][ T9308] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.646567][ T9308] ? fbcon_do_set_font+0x960/0x960 [ 99.646575][ T9308] con_font_op+0x6b2/0x1270 [ 99.646582][ T9308] ? lock_downgrade+0x920/0x920 [ 99.646589][ T9308] ? con_write+0xd0/0xd0 [ 99.646601][ T9308] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 99.646609][ T9308] ? _copy_from_user+0x12c/0x1a0 [ 99.646617][ T9308] vt_ioctl+0x181a/0x26d0 [ 99.646626][ T9308] ? complete_change_console+0x3a0/0x3a0 [ 99.646635][ T9308] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 99.646645][ T9308] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 99.646654][ T9308] ? tty_jobctrl_ioctl+0x50/0xd40 [ 99.646661][ T9308] ? complete_change_console+0x3a0/0x3a0 [ 99.646668][ T9308] tty_ioctl+0xa37/0x14f0 [ 99.646675][ T9308] ? tty_vhangup+0x30/0x30 [ 99.646683][ T9308] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 99.646691][ T9308] ? do_vfs_ioctl+0x11b/0x1340 [ 99.646699][ T9308] ? ioctl_file_clone+0x180/0x180 [ 99.646706][ T9308] ? file_open_root+0x5f0/0x5f0 [ 99.646714][ T9308] ? __kasan_check_write+0x14/0x20 [ 99.646721][ T9308] ? up_read+0x1cd/0x810 [ 99.646730][ T9308] ? tomoyo_file_ioctl+0x23/0x30 [ 99.646739][ T9308] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.646746][ T9308] ? security_file_ioctl+0x8d/0xc0 [ 99.646753][ T9308] ? tty_vhangup+0x30/0x30 [ 99.646760][ T9308] ksys_ioctl+0x123/0x180 [ 99.646768][ T9308] __x64_sys_ioctl+0x73/0xb0 [ 99.646777][ T9308] do_syscall_64+0xfa/0x790 [ 99.646786][ T9308] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.646790][ T9308] RIP: 0033:0x440269 [ 99.646797][ T9308] 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 [ 99.646801][ T9308] RSP: 002b:00007ffeb2ebb798 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 99.646807][ T9308] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 99.646812][ T9308] RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000004 [ 99.646816][ T9308] RBP: 00000000006cb018 R08: 000000000000000d R09: 00000000004002c8 [ 99.646820][ T9308] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b50 [ 99.646824][ T9308] R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 [ 99.648142][ T9308] Kernel Offset: disabled [ 100.530653][ T9308] Rebooting in 86400 seconds..