[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.537326][ T26] audit: type=1800 audit(1576506960.183:25): pid=9136 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 68.558089][ T26] audit: type=1800 audit(1576506960.183:26): pid=9136 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.600518][ T26] audit: type=1800 audit(1576506960.183:27): pid=9136 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 '10.128.0.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 80.530754][ T9289] ================================================================== [ 80.530799][ T9289] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 80.530806][ T9289] Read of size 2 at addr ffffffff8875221e by task syz-executor611/9289 [ 80.530809][ T9289] [ 80.530820][ T9289] CPU: 0 PID: 9289 Comm: syz-executor611 Not tainted 5.5.0-rc1-next-20191213-syzkaller #0 [ 80.530826][ T9289] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.530830][ T9289] Call Trace: [ 80.530841][ T9289] dump_stack+0x197/0x210 [ 80.530850][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.530864][ T9289] print_address_description.constprop.0.cold+0x5/0x30b [ 80.530871][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.530878][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.530887][ T9289] __kasan_report.cold+0x1b/0x41 [ 80.530896][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.530906][ T9289] kasan_report+0x12/0x20 [ 80.530915][ T9289] __asan_report_load2_noabort+0x14/0x20 [ 80.530923][ T9289] vga16fb_imageblit+0x1c8b/0x2200 [ 80.530931][ T9289] ? mark_lock+0x11f/0x1220 [ 80.530946][ T9289] soft_cursor+0x4fb/0xa30 [ 80.530953][ T9289] ? lockdep_hardirqs_on+0x421/0x5e0 [ 80.530967][ T9289] bit_cursor+0x12fc/0x1a60 [ 80.530979][ T9289] ? bit_clear+0x530/0x530 [ 80.530986][ T9289] ? fbcon_putcs+0x33c/0x3e0 [ 80.530993][ T9289] ? fbcon_putcs+0x343/0x3e0 [ 80.531008][ T9289] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 80.531016][ T9289] ? get_color+0x225/0x430 [ 80.531025][ T9289] fbcon_cursor+0x487/0x660 [ 80.531033][ T9289] ? bit_clear+0x530/0x530 [ 80.531044][ T9289] set_cursor+0x1fb/0x280 [ 80.531054][ T9289] redraw_screen+0x4e1/0x7d0 [ 80.531061][ T9289] ? efifb_probe.cold+0x181f/0x181f [ 80.531071][ T9289] ? respond_string+0x2c0/0x2c0 [ 80.531080][ T9289] ? fbcon_set_palette+0x3c4/0x4a0 [ 80.531090][ T9289] fbcon_modechanged+0x5c3/0x790 [ 80.531101][ T9289] fbcon_update_vcs+0x42/0x50 [ 80.531110][ T9289] fb_set_var+0xb32/0xdd0 [ 80.531120][ T9289] ? fb_blank+0x1a0/0x1a0 [ 80.531128][ T9289] ? lock_acquire+0x190/0x410 [ 80.531142][ T9289] ? __mutex_lock+0x458/0x13c0 [ 80.531151][ T9289] ? down+0x50/0x90 [ 80.531171][ T9289] ? do_fb_ioctl+0x335/0x7d0 [ 80.531184][ T9289] do_fb_ioctl+0x390/0x7d0 [ 80.531193][ T9289] ? fb_mmap+0x520/0x520 [ 80.531203][ T9289] ? tomoyo_path_number_perm+0x214/0x520 [ 80.531211][ T9289] ? find_held_lock+0x35/0x130 [ 80.531220][ T9289] ? tomoyo_path_number_perm+0x214/0x520 [ 80.531231][ T9289] ? lock_downgrade+0x920/0x920 [ 80.531238][ T9289] ? lockdep_hardirqs_on+0x421/0x5e0 [ 80.531249][ T9289] ? tomoyo_path_number_perm+0x454/0x520 [ 80.531270][ T9289] ? trace_hardirqs_on+0x67/0x240 [ 80.531282][ T9289] fb_ioctl+0xe6/0x130 [ 80.531289][ T9289] ? do_fb_ioctl+0x7d0/0x7d0 [ 80.531299][ T9289] do_vfs_ioctl+0x977/0x14e0 [ 80.531309][ T9289] ? compat_ioctl_preallocate+0x220/0x220 [ 80.531316][ T9289] ? chown_common+0x5c0/0x5c0 [ 80.531327][ T9289] ? __kasan_check_write+0x14/0x20 [ 80.531335][ T9289] ? up_read+0x1cd/0x810 [ 80.531348][ T9289] ? tomoyo_file_ioctl+0x23/0x30 [ 80.531357][ T9289] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.531365][ T9289] ? security_file_ioctl+0x8d/0xc0 [ 80.531375][ T9289] ksys_ioctl+0xab/0xd0 [ 80.531384][ T9289] __x64_sys_ioctl+0x73/0xb0 [ 80.531395][ T9289] do_syscall_64+0xfa/0x790 [ 80.531407][ T9289] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 80.531414][ T9289] RIP: 0033:0x440309 [ 80.531424][ T9289] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 80.531429][ T9289] RSP: 002b:00007ffc19ba4128 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 80.531437][ T9289] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 80.531442][ T9289] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 80.531446][ T9289] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 80.531451][ T9289] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 80.531455][ T9289] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 80.531466][ T9289] [ 80.531469][ T9289] The buggy address belongs to the variable: [ 80.531477][ T9289] transl_h+0x3e/0x40 [ 80.531479][ T9289] [ 80.531481][ T9289] Memory state around the buggy address: [ 80.531489][ T9289] ffffffff88752100: 00 00 00 00 fa fa fa fa 00 00 00 00 00 fa fa fa [ 80.531495][ T9289] ffffffff88752180: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 [ 80.531501][ T9289] >ffffffff88752200: fa fa fa fa 00 00 00 00 fa fa fa fa 00 01 fa fa [ 80.531504][ T9289] ^ [ 80.531510][ T9289] ffffffff88752280: fa fa fa fa 00 00 00 04 fa fa fa fa 00 00 04 fa [ 80.531516][ T9289] ffffffff88752300: fa fa fa fa 00 00 00 00 00 00 02 fa fa fa fa fa [ 80.531519][ T9289] ================================================================== [ 80.531523][ T9289] Disabling lock debugging due to kernel taint [ 80.531528][ T9289] Kernel panic - not syncing: panic_on_warn set ... [ 80.531536][ T9289] CPU: 0 PID: 9289 Comm: syz-executor611 Tainted: G B 5.5.0-rc1-next-20191213-syzkaller #0 [ 80.531540][ T9289] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.531542][ T9289] Call Trace: [ 80.531548][ T9289] dump_stack+0x197/0x210 [ 80.531558][ T9289] panic+0x2e3/0x75c [ 80.531566][ T9289] ? add_taint.cold+0x16/0x16 [ 80.531576][ T9289] ? trace_hardirqs_on+0x67/0x240 [ 80.531589][ T9289] ? trace_hardirqs_on+0x5e/0x240 [ 80.531597][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.531604][ T9289] end_report+0x47/0x4f [ 80.531611][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.531618][ T9289] __kasan_report.cold+0xe/0x41 [ 80.531625][ T9289] ? vga16fb_imageblit+0x1c8b/0x2200 [ 80.531633][ T9289] kasan_report+0x12/0x20 [ 80.531641][ T9289] __asan_report_load2_noabort+0x14/0x20 [ 80.531648][ T9289] vga16fb_imageblit+0x1c8b/0x2200 [ 80.531654][ T9289] ? mark_lock+0x11f/0x1220 [ 80.531664][ T9289] soft_cursor+0x4fb/0xa30 [ 80.531670][ T9289] ? lockdep_hardirqs_on+0x421/0x5e0 [ 80.531680][ T9289] bit_cursor+0x12fc/0x1a60 [ 80.531689][ T9289] ? bit_clear+0x530/0x530 [ 80.531695][ T9289] ? fbcon_putcs+0x33c/0x3e0 [ 80.531701][ T9289] ? fbcon_putcs+0x343/0x3e0 [ 80.531711][ T9289] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 80.531718][ T9289] ? get_color+0x225/0x430 [ 80.531725][ T9289] fbcon_cursor+0x487/0x660 [ 80.531732][ T9289] ? bit_clear+0x530/0x530 [ 80.531740][ T9289] set_cursor+0x1fb/0x280 [ 80.531749][ T9289] redraw_screen+0x4e1/0x7d0 [ 80.531755][ T9289] ? efifb_probe.cold+0x181f/0x181f [ 80.531764][ T9289] ? respond_string+0x2c0/0x2c0 [ 80.531771][ T9289] ? fbcon_set_palette+0x3c4/0x4a0 [ 80.531779][ T9289] fbcon_modechanged+0x5c3/0x790 [ 80.531787][ T9289] fbcon_update_vcs+0x42/0x50 [ 80.531795][ T9289] fb_set_var+0xb32/0xdd0 [ 80.531803][ T9289] ? fb_blank+0x1a0/0x1a0 [ 80.531809][ T9289] ? lock_acquire+0x190/0x410 [ 80.531819][ T9289] ? __mutex_lock+0x458/0x13c0 [ 80.531826][ T9289] ? down+0x50/0x90 [ 80.531841][ T9289] ? do_fb_ioctl+0x335/0x7d0 [ 80.531851][ T9289] do_fb_ioctl+0x390/0x7d0 [ 80.531859][ T9289] ? fb_mmap+0x520/0x520 [ 80.531866][ T9289] ? tomoyo_path_number_perm+0x214/0x520 [ 80.531872][ T9289] ? find_held_lock+0x35/0x130 [ 80.531880][ T9289] ? tomoyo_path_number_perm+0x214/0x520 [ 80.531888][ T9289] ? lock_downgrade+0x920/0x920 [ 80.531895][ T9289] ? lockdep_hardirqs_on+0x421/0x5e0 [ 80.531904][ T9289] ? tomoyo_path_number_perm+0x454/0x520 [ 80.531917][ T9289] ? trace_hardirqs_on+0x67/0x240 [ 80.531926][ T9289] fb_ioctl+0xe6/0x130 [ 80.531933][ T9289] ? do_fb_ioctl+0x7d0/0x7d0 [ 80.531940][ T9289] do_vfs_ioctl+0x977/0x14e0 [ 80.531948][ T9289] ? compat_ioctl_preallocate+0x220/0x220 [ 80.531954][ T9289] ? chown_common+0x5c0/0x5c0 [ 80.531962][ T9289] ? __kasan_check_write+0x14/0x20 [ 80.531969][ T9289] ? up_read+0x1cd/0x810 [ 80.531980][ T9289] ? tomoyo_file_ioctl+0x23/0x30 [ 80.531988][ T9289] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.531994][ T9289] ? security_file_ioctl+0x8d/0xc0 [ 80.532002][ T9289] ksys_ioctl+0xab/0xd0 [ 80.532009][ T9289] __x64_sys_ioctl+0x73/0xb0 [ 80.532018][ T9289] do_syscall_64+0xfa/0x790 [ 80.532028][ T9289] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 80.532032][ T9289] RIP: 0033:0x440309 [ 80.532039][ T9289] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 80.532042][ T9289] RSP: 002b:00007ffc19ba4128 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 80.532049][ T9289] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 80.532053][ T9289] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 80.532057][ T9289] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 80.532061][ T9289] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 80.532065][ T9289] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 80.534439][ T9289] Kernel Offset: disabled [ 81.465703][ T9289] Rebooting in 86400 seconds..