[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.552433][ T26] audit: type=1800 audit(1575420993.224:25): pid=8877 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.580182][ T26] audit: type=1800 audit(1575420993.224:26): pid=8877 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.624974][ T26] audit: type=1800 audit(1575420993.224:27): pid=8877 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 '10.128.0.253' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 71.370409][ T9029] ================================================================== [ 71.370452][ T9029] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 71.370459][ T9029] Read of size 2 at addr ffffffff8874d458 by task syz-executor305/9029 [ 71.370462][ T9029] [ 71.370477][ T9029] CPU: 0 PID: 9029 Comm: syz-executor305 Not tainted 5.4.0-syzkaller #0 [ 71.370482][ T9029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.370485][ T9029] Call Trace: [ 71.370498][ T9029] dump_stack+0x197/0x210 [ 71.370507][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.370520][ T9029] print_address_description.constprop.0.cold+0x5/0x30b [ 71.370527][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.370535][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.370543][ T9029] __kasan_report.cold+0x1b/0x41 [ 71.370553][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.370561][ T9029] kasan_report+0x12/0x20 [ 71.370570][ T9029] __asan_report_load2_noabort+0x14/0x20 [ 71.370578][ T9029] vga16fb_imageblit+0x1c8b/0x2200 [ 71.370594][ T9029] soft_cursor+0x4fb/0xa30 [ 71.370605][ T9029] ? __lock_task_sighand+0x125/0x2f0 [ 71.370618][ T9029] bit_cursor+0x12fc/0x1a60 [ 71.370632][ T9029] ? bit_clear+0x530/0x530 [ 71.370642][ T9029] ? find_held_lock+0x35/0x130 [ 71.370658][ T9029] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 71.370667][ T9029] ? get_color+0x225/0x430 [ 71.370676][ T9029] fbcon_cursor+0x487/0x660 [ 71.370684][ T9029] ? bit_clear+0x530/0x530 [ 71.370696][ T9029] hide_cursor+0x9d/0x2b0 [ 71.370705][ T9029] redraw_screen+0x60b/0x7d0 [ 71.370713][ T9029] ? respond_string+0x2c0/0x2c0 [ 71.370726][ T9029] vc_do_resize+0x10c9/0x1460 [ 71.370734][ T9029] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 71.370750][ T9029] ? vc_uniscr_alloc+0xd0/0xd0 [ 71.370763][ T9029] vc_resize+0x4d/0x60 [ 71.370772][ T9029] fbcon_modechanged+0x367/0x790 [ 71.370783][ T9029] fbcon_update_vcs+0x42/0x50 [ 71.370791][ T9029] fb_set_var+0xb32/0xdd0 [ 71.370799][ T9029] ? fb_blank+0x1a0/0x1a0 [ 71.370807][ T9029] ? lock_acquire+0x190/0x410 [ 71.370820][ T9029] ? __mutex_lock+0x458/0x13c0 [ 71.370827][ T9029] ? down+0x50/0x90 [ 71.370846][ T9029] ? do_fb_ioctl+0x335/0x7d0 [ 71.370858][ T9029] do_fb_ioctl+0x390/0x7d0 [ 71.370865][ T9029] ? fb_mmap+0x520/0x520 [ 71.370873][ T9029] ? tomoyo_path_number_perm+0x214/0x520 [ 71.370882][ T9029] ? find_held_lock+0x35/0x130 [ 71.370889][ T9029] ? tomoyo_path_number_perm+0x214/0x520 [ 71.370900][ T9029] ? lock_downgrade+0x920/0x920 [ 71.370908][ T9029] ? lockdep_hardirqs_on+0x421/0x5e0 [ 71.370917][ T9029] ? tomoyo_path_number_perm+0x454/0x520 [ 71.370940][ T9029] fb_ioctl+0xe6/0x130 [ 71.370946][ T9029] ? do_fb_ioctl+0x7d0/0x7d0 [ 71.370955][ T9029] do_vfs_ioctl+0x977/0x14e0 [ 71.370965][ T9029] ? compat_ioctl_preallocate+0x220/0x220 [ 71.370973][ T9029] ? kmem_cache_free+0x26b/0x320 [ 71.370983][ T9029] ? putname+0xf4/0x130 [ 71.370991][ T9029] ? do_sys_open+0x31d/0x5d0 [ 71.371001][ T9029] ? tomoyo_file_ioctl+0x23/0x30 [ 71.371010][ T9029] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 71.371020][ T9029] ? security_file_ioctl+0x8d/0xc0 [ 71.371029][ T9029] ksys_ioctl+0xab/0xd0 [ 71.371038][ T9029] __x64_sys_ioctl+0x73/0xb0 [ 71.371049][ T9029] do_syscall_64+0xfa/0x790 [ 71.371060][ T9029] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 71.371067][ T9029] RIP: 0033:0x440309 [ 71.371076][ T9029] 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 [ 71.371081][ T9029] RSP: 002b:00007ffd15fe2008 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 71.371089][ T9029] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 71.371094][ T9029] RDX: 0000000020000100 RSI: 0000000000004601 RDI: 0000000000000003 [ 71.371099][ T9029] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 71.371103][ T9029] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 71.371108][ T9029] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 71.371118][ T9029] [ 71.371121][ T9029] The buggy address belongs to the variable: [ 71.371129][ T9029] transl_h+0x38/0x40 [ 71.371131][ T9029] [ 71.371133][ T9029] Memory state around the buggy address: [ 71.371141][ T9029] ffffffff8874d300: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 71.371147][ T9029] ffffffff8874d380: 00 00 00 00 00 fa fa fa fa fa fa fa 04 fa fa fa [ 71.371152][ T9029] >ffffffff8874d400: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 71.371156][ T9029] ^ [ 71.371161][ T9029] ffffffff8874d480: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04 [ 71.371180][ T9029] ffffffff8874d500: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00 [ 71.371188][ T9029] ================================================================== [ 71.371192][ T9029] Disabling lock debugging due to kernel taint [ 71.371196][ T9029] Kernel panic - not syncing: panic_on_warn set ... [ 71.371204][ T9029] CPU: 0 PID: 9029 Comm: syz-executor305 Tainted: G B 5.4.0-syzkaller #0 [ 71.371208][ T9029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.371210][ T9029] Call Trace: [ 71.371218][ T9029] dump_stack+0x197/0x210 [ 71.371227][ T9029] panic+0x2e3/0x75c [ 71.371234][ T9029] ? add_taint.cold+0x16/0x16 [ 71.371244][ T9029] ? trace_hardirqs_on+0x67/0x240 [ 71.371251][ T9029] ? trace_hardirqs_on+0x5e/0x240 [ 71.371260][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.371266][ T9029] end_report+0x47/0x4f [ 71.371273][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.371280][ T9029] __kasan_report.cold+0xe/0x41 [ 71.371288][ T9029] ? vga16fb_imageblit+0x1c8b/0x2200 [ 71.371295][ T9029] kasan_report+0x12/0x20 [ 71.371302][ T9029] __asan_report_load2_noabort+0x14/0x20 [ 71.371309][ T9029] vga16fb_imageblit+0x1c8b/0x2200 [ 71.371320][ T9029] soft_cursor+0x4fb/0xa30 [ 71.371327][ T9029] ? __lock_task_sighand+0x125/0x2f0 [ 71.371337][ T9029] bit_cursor+0x12fc/0x1a60 [ 71.371346][ T9029] ? bit_clear+0x530/0x530 [ 71.371354][ T9029] ? find_held_lock+0x35/0x130 [ 71.371364][ T9029] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 71.371371][ T9029] ? get_color+0x225/0x430 [ 71.371379][ T9029] fbcon_cursor+0x487/0x660 [ 71.371385][ T9029] ? bit_clear+0x530/0x530 [ 71.371394][ T9029] hide_cursor+0x9d/0x2b0 [ 71.371400][ T9029] redraw_screen+0x60b/0x7d0 [ 71.371407][ T9029] ? respond_string+0x2c0/0x2c0 [ 71.371416][ T9029] vc_do_resize+0x10c9/0x1460 [ 71.371423][ T9029] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 71.371434][ T9029] ? vc_uniscr_alloc+0xd0/0xd0 [ 71.371443][ T9029] vc_resize+0x4d/0x60 [ 71.371450][ T9029] fbcon_modechanged+0x367/0x790 [ 71.371459][ T9029] fbcon_update_vcs+0x42/0x50 [ 71.371465][ T9029] fb_set_var+0xb32/0xdd0 [ 71.371475][ T9029] ? fb_blank+0x1a0/0x1a0 [ 71.371482][ T9029] ? lock_acquire+0x190/0x410 [ 71.371491][ T9029] ? __mutex_lock+0x458/0x13c0 [ 71.371497][ T9029] ? down+0x50/0x90 [ 71.371509][ T9029] ? do_fb_ioctl+0x335/0x7d0 [ 71.371517][ T9029] do_fb_ioctl+0x390/0x7d0 [ 71.371523][ T9029] ? fb_mmap+0x520/0x520 [ 71.371529][ T9029] ? tomoyo_path_number_perm+0x214/0x520 [ 71.371537][ T9029] ? find_held_lock+0x35/0x130 [ 71.371544][ T9029] ? tomoyo_path_number_perm+0x214/0x520 [ 71.371552][ T9029] ? lock_downgrade+0x920/0x920 [ 71.371558][ T9029] ? lockdep_hardirqs_on+0x421/0x5e0 [ 71.371566][ T9029] ? tomoyo_path_number_perm+0x454/0x520 [ 71.371580][ T9029] fb_ioctl+0xe6/0x130 [ 71.371585][ T9029] ? do_fb_ioctl+0x7d0/0x7d0 [ 71.371592][ T9029] do_vfs_ioctl+0x977/0x14e0 [ 71.371600][ T9029] ? compat_ioctl_preallocate+0x220/0x220 [ 71.371607][ T9029] ? kmem_cache_free+0x26b/0x320 [ 71.371614][ T9029] ? putname+0xf4/0x130 [ 71.371621][ T9029] ? do_sys_open+0x31d/0x5d0 [ 71.371629][ T9029] ? tomoyo_file_ioctl+0x23/0x30 [ 71.371636][ T9029] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 71.371644][ T9029] ? security_file_ioctl+0x8d/0xc0 [ 71.371651][ T9029] ksys_ioctl+0xab/0xd0 [ 71.371658][ T9029] __x64_sys_ioctl+0x73/0xb0 [ 71.371666][ T9029] do_syscall_64+0xfa/0x790 [ 71.371675][ T9029] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 71.371679][ T9029] RIP: 0033:0x440309 [ 71.371686][ T9029] 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 [ 71.371690][ T9029] RSP: 002b:00007ffd15fe2008 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 71.371696][ T9029] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 71.371700][ T9029] RDX: 0000000020000100 RSI: 0000000000004601 RDI: 0000000000000003 [ 71.371704][ T9029] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 71.371708][ T9029] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 71.371712][ T9029] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 71.373195][ T9029] Kernel Offset: disabled [ 72.233933][ T9029] Rebooting in 86400 seconds..