[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 89.769437][ T23] audit: type=1800 audit(1581254036.862:25): pid=9560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 89.803199][ T23] audit: type=1800 audit(1581254036.862:26): pid=9560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 89.856817][ T23] audit: type=1800 audit(1581254036.862:27): pid=9560 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 '10.128.0.87' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 99.746958][ T9714] ================================================================== [ 99.747001][ T9714] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 99.747009][ T9714] Read of size 2 at addr ffffffff8896c23e by task syz-executor065/9714 [ 99.747011][ T9714] [ 99.747020][ T9714] CPU: 0 PID: 9714 Comm: syz-executor065 Not tainted 5.5.0-syzkaller #0 [ 99.747026][ T9714] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.747029][ T9714] Call Trace: [ 99.747041][ T9714] dump_stack+0x197/0x210 [ 99.747051][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.747065][ T9714] print_address_description.constprop.0.cold+0x5/0x30b [ 99.747073][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.747082][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.747091][ T9714] __kasan_report.cold+0x1b/0x32 [ 99.747102][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.747114][ T9714] kasan_report+0x12/0x20 [ 99.747125][ T9714] __asan_report_load2_noabort+0x14/0x20 [ 99.747134][ T9714] vga16fb_imageblit+0x1c8b/0x2200 [ 99.747143][ T9714] ? mark_lock+0x1bf/0x1220 [ 99.747164][ T9714] soft_cursor+0x4fb/0xa30 [ 99.747172][ T9714] ? lockdep_hardirqs_on+0x421/0x5e0 [ 99.747192][ T9714] bit_cursor+0x12fc/0x1a60 [ 99.747210][ T9714] ? bit_clear+0x530/0x530 [ 99.747218][ T9714] ? fbcon_putcs+0x33c/0x3e0 [ 99.747225][ T9714] ? fbcon_putcs+0x343/0x3e0 [ 99.747246][ T9714] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 99.747256][ T9714] ? get_color+0x225/0x430 [ 99.747268][ T9714] fbcon_cursor+0x487/0x660 [ 99.747276][ T9714] ? bit_clear+0x530/0x530 [ 99.747289][ T9714] set_cursor+0x1fb/0x280 [ 99.747298][ T9714] redraw_screen+0x4e1/0x7d0 [ 99.747306][ T9714] ? vesafb_probe.cold+0x1279/0x1279 [ 99.747316][ T9714] ? respond_string+0x2c0/0x2c0 [ 99.747328][ T9714] ? fbcon_set_palette+0x3c4/0x4a0 [ 99.747341][ T9714] fbcon_modechanged+0x5c3/0x790 [ 99.747356][ T9714] fbcon_update_vcs+0x42/0x50 [ 99.747365][ T9714] fb_set_var+0xb32/0xdd0 [ 99.747375][ T9714] ? fb_blank+0x1a0/0x1a0 [ 99.747383][ T9714] ? stack_depot_save+0x25a/0x450 [ 99.747398][ T9714] ? save_stack+0x5c/0x90 [ 99.747405][ T9714] ? save_stack+0x23/0x90 [ 99.747412][ T9714] ? __kasan_slab_free+0x102/0x150 [ 99.747420][ T9714] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 99.747429][ T9714] ? vga16fb_imageblit+0x1eb/0x2200 [ 99.747435][ T9714] ? vc_resize+0x4d/0x60 [ 99.747442][ T9714] ? fbcon_modechanged+0x367/0x790 [ 99.747450][ T9714] ? fbcon_update_vcs+0x4f/0x50 [ 99.747484][ T9714] ? bit_cursor+0xaf6/0x1a60 [ 99.747493][ T9714] ? fb_videomode_to_var+0x14/0x630 [ 99.747507][ T9714] fbcon_switch+0x556/0x17f0 [ 99.747523][ T9714] ? fbcon_set_def_font+0x360/0x360 [ 99.747546][ T9714] ? fbcon_cursor+0x48c/0x660 [ 99.747558][ T9714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.747566][ T9714] ? fbcon_set_origin+0x2b/0x50 [ 99.747574][ T9714] ? fbcon_scrolldelta+0x1220/0x1220 [ 99.747582][ T9714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.747593][ T9714] redraw_screen+0x2b6/0x7d0 [ 99.747601][ T9714] ? vesafb_probe.cold+0x1279/0x1279 [ 99.747612][ T9714] ? respond_string+0x2c0/0x2c0 [ 99.747625][ T9714] ? fbcon_set_palette+0x3c4/0x4a0 [ 99.747639][ T9714] fbcon_modechanged+0x5c3/0x790 [ 99.747659][ T9714] fbcon_update_vcs+0x42/0x50 [ 99.747667][ T9714] fb_set_var+0xb32/0xdd0 [ 99.747678][ T9714] ? fb_blank+0x1a0/0x1a0 [ 99.747687][ T9714] ? lock_acquire+0x190/0x410 [ 99.747707][ T9714] ? __mutex_lock+0x458/0x13c0 [ 99.747715][ T9714] ? down+0x50/0x90 [ 99.747746][ T9714] ? do_fb_ioctl+0x335/0x7d0 [ 99.747763][ T9714] do_fb_ioctl+0x390/0x7d0 [ 99.747772][ T9714] ? fb_mmap+0x560/0x560 [ 99.747780][ T9714] ? lockdep_hardirqs_on+0x421/0x5e0 [ 99.747797][ T9714] ? tomoyo_path_number_perm+0x454/0x520 [ 99.747810][ T9714] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 99.747819][ T9714] ? tomoyo_path_number_perm+0x25e/0x520 [ 99.747832][ T9714] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 99.747840][ T9714] ? putname+0xef/0x130 [ 99.747851][ T9714] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 99.747879][ T9714] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 99.747887][ T9714] ? do_vfs_ioctl+0x568/0x13b0 [ 99.747904][ T9714] fb_compat_ioctl+0x305/0xc50 [ 99.747913][ T9714] ? fb_release+0x150/0x150 [ 99.747925][ T9714] ? do_sys_open+0xf2/0x180 [ 99.747940][ T9714] ? tomoyo_file_ioctl+0x23/0x30 [ 99.747949][ T9714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.747960][ T9714] ? fb_release+0x150/0x150 [ 99.747969][ T9714] __ia32_compat_sys_ioctl+0x245/0x2c0 [ 99.747984][ T9714] do_fast_syscall_32+0x27b/0xe16 [ 99.747998][ T9714] entry_SYSENTER_compat+0x70/0x7f [ 99.748005][ T9714] RIP: 0023:0xf7fdae39 [ 99.748015][ T9714] Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 99.748019][ T9714] RSP: 002b:00000000ff913efc EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 99.748027][ T9714] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 [ 99.748032][ T9714] RDX: 0000000020000000 RSI: 00000000080ea078 RDI: 00000000ff913f50 [ 99.748037][ T9714] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 99.748041][ T9714] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 99.748045][ T9714] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 99.748063][ T9714] [ 99.748066][ T9714] The buggy address belongs to the variable: [ 99.748073][ T9714] transl_h+0x3e/0x40 [ 99.748075][ T9714] [ 99.748078][ T9714] Memory state around the buggy address: [ 99.748085][ T9714] ffffffff8896c100: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 [ 99.748091][ T9714] ffffffff8896c180: 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa fa [ 99.748097][ T9714] >ffffffff8896c200: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 99.748101][ T9714] ^ [ 99.748107][ T9714] ffffffff8896c280: 00 01 fa fa fa fa fa fa 00 00 00 04 fa fa fa fa [ 99.748112][ T9714] ffffffff8896c300: 00 00 04 fa fa fa fa fa 00 00 00 00 00 00 02 fa [ 99.748115][ T9714] ================================================================== [ 99.748118][ T9714] Disabling lock debugging due to kernel taint [ 99.748122][ T9714] Kernel panic - not syncing: panic_on_warn set ... [ 99.748130][ T9714] CPU: 0 PID: 9714 Comm: syz-executor065 Tainted: G B 5.5.0-syzkaller #0 [ 99.748134][ T9714] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.748136][ T9714] Call Trace: [ 99.748143][ T9714] dump_stack+0x197/0x210 [ 99.748153][ T9714] panic+0x2e3/0x75c [ 99.748161][ T9714] ? add_taint.cold+0x16/0x16 [ 99.748174][ T9714] ? trace_hardirqs_on+0x67/0x240 [ 99.748182][ T9714] ? trace_hardirqs_on+0x5e/0x240 [ 99.748191][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.748199][ T9714] end_report+0x47/0x4f [ 99.748206][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.748214][ T9714] __kasan_report.cold+0xe/0x32 [ 99.748223][ T9714] ? vga16fb_imageblit+0x1c8b/0x2200 [ 99.748232][ T9714] kasan_report+0x12/0x20 [ 99.748241][ T9714] __asan_report_load2_noabort+0x14/0x20 [ 99.748248][ T9714] vga16fb_imageblit+0x1c8b/0x2200 [ 99.748255][ T9714] ? mark_lock+0x1bf/0x1220 [ 99.748267][ T9714] soft_cursor+0x4fb/0xa30 [ 99.748274][ T9714] ? lockdep_hardirqs_on+0x421/0x5e0 [ 99.748287][ T9714] bit_cursor+0x12fc/0x1a60 [ 99.748299][ T9714] ? bit_clear+0x530/0x530 [ 99.748305][ T9714] ? fbcon_putcs+0x33c/0x3e0 [ 99.748312][ T9714] ? fbcon_putcs+0x343/0x3e0 [ 99.748325][ T9714] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 99.748333][ T9714] ? get_color+0x225/0x430 [ 99.748342][ T9714] fbcon_cursor+0x487/0x660 [ 99.748349][ T9714] ? bit_clear+0x530/0x530 [ 99.748357][ T9714] set_cursor+0x1fb/0x280 [ 99.748364][ T9714] redraw_screen+0x4e1/0x7d0 [ 99.748371][ T9714] ? vesafb_probe.cold+0x1279/0x1279 [ 99.748379][ T9714] ? respond_string+0x2c0/0x2c0 [ 99.748388][ T9714] ? fbcon_set_palette+0x3c4/0x4a0 [ 99.748397][ T9714] fbcon_modechanged+0x5c3/0x790 [ 99.748408][ T9714] fbcon_update_vcs+0x42/0x50 [ 99.748414][ T9714] fb_set_var+0xb32/0xdd0 [ 99.748422][ T9714] ? fb_blank+0x1a0/0x1a0 [ 99.748428][ T9714] ? stack_depot_save+0x25a/0x450 [ 99.748438][ T9714] ? save_stack+0x5c/0x90 [ 99.748445][ T9714] ? save_stack+0x23/0x90 [ 99.748451][ T9714] ? __kasan_slab_free+0x102/0x150 [ 99.748459][ T9714] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 99.748466][ T9714] ? vga16fb_imageblit+0x1eb/0x2200 [ 99.748472][ T9714] ? vc_resize+0x4d/0x60 [ 99.748479][ T9714] ? fbcon_modechanged+0x367/0x790 [ 99.748486][ T9714] ? fbcon_update_vcs+0x4f/0x50 [ 99.748505][ T9714] ? bit_cursor+0xaf6/0x1a60 [ 99.748512][ T9714] ? fb_videomode_to_var+0x14/0x630 [ 99.748522][ T9714] fbcon_switch+0x556/0x17f0 [ 99.748533][ T9714] ? fbcon_set_def_font+0x360/0x360 [ 99.748547][ T9714] ? fbcon_cursor+0x48c/0x660 [ 99.748556][ T9714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.748563][ T9714] ? fbcon_set_origin+0x2b/0x50 [ 99.748571][ T9714] ? fbcon_scrolldelta+0x1220/0x1220 [ 99.748578][ T9714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.748586][ T9714] redraw_screen+0x2b6/0x7d0 [ 99.748593][ T9714] ? vesafb_probe.cold+0x1279/0x1279 [ 99.748601][ T9714] ? respond_string+0x2c0/0x2c0 [ 99.748610][ T9714] ? fbcon_set_palette+0x3c4/0x4a0 [ 99.748619][ T9714] fbcon_modechanged+0x5c3/0x790 [ 99.748630][ T9714] fbcon_update_vcs+0x42/0x50 [ 99.748637][ T9714] fb_set_var+0xb32/0xdd0 [ 99.748650][ T9714] ? fb_blank+0x1a0/0x1a0 [ 99.748657][ T9714] ? lock_acquire+0x190/0x410 [ 99.748669][ T9714] ? __mutex_lock+0x458/0x13c0 [ 99.748675][ T9714] ? down+0x50/0x90 [ 99.748692][ T9714] ? do_fb_ioctl+0x335/0x7d0 [ 99.748703][ T9714] do_fb_ioctl+0x390/0x7d0 [ 99.748710][ T9714] ? fb_mmap+0x560/0x560 [ 99.748716][ T9714] ? lockdep_hardirqs_on+0x421/0x5e0 [ 99.748727][ T9714] ? tomoyo_path_number_perm+0x454/0x520 [ 99.748737][ T9714] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 99.748745][ T9714] ? tomoyo_path_number_perm+0x25e/0x520 [ 99.748755][ T9714] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 99.748761][ T9714] ? putname+0xef/0x130 [ 99.748769][ T9714] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 99.748785][ T9714] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 99.748793][ T9714] ? do_vfs_ioctl+0x568/0x13b0 [ 99.748803][ T9714] fb_compat_ioctl+0x305/0xc50 [ 99.748810][ T9714] ? fb_release+0x150/0x150 [ 99.748819][ T9714] ? do_sys_open+0xf2/0x180 [ 99.748829][ T9714] ? tomoyo_file_ioctl+0x23/0x30 [ 99.748837][ T9714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.748845][ T9714] ? fb_release+0x150/0x150 [ 99.748853][ T9714] __ia32_compat_sys_ioctl+0x245/0x2c0 [ 99.748863][ T9714] do_fast_syscall_32+0x27b/0xe16 [ 99.748872][ T9714] entry_SYSENTER_compat+0x70/0x7f [ 99.748877][ T9714] RIP: 0023:0xf7fdae39 [ 99.748884][ T9714] Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 99.748888][ T9714] RSP: 002b:00000000ff913efc EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 99.748894][ T9714] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 [ 99.748898][ T9714] RDX: 0000000020000000 RSI: 00000000080ea078 RDI: 00000000ff913f50 [ 99.748902][ T9714] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 99.748906][ T9714] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 99.748909][ T9714] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 99.750364][ T9714] Kernel Offset: disabled [ 100.860437][ T9714] Rebooting in 86400 seconds..