[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.464949][ T25] audit: type=1800 audit(1575433919.926:25): pid=8932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.492475][ T25] audit: type=1800 audit(1575433919.926:26): pid=8932 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.540342][ T25] audit: type=1800 audit(1575433919.926:27): pid=8932 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 '10.128.15.237' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.529240][ T9084] ================================================================== [ 75.529283][ T9084] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 75.529291][ T9084] Read of size 2 at addr ffffffff8874d458 by task syz-executor797/9084 [ 75.529293][ T9084] [ 75.529303][ T9084] CPU: 1 PID: 9084 Comm: syz-executor797 Not tainted 5.4.0-syzkaller #0 [ 75.529308][ T9084] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.529312][ T9084] Call Trace: [ 75.529326][ T9084] dump_stack+0x197/0x210 [ 75.529334][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.529347][ T9084] print_address_description.constprop.0.cold+0x5/0x30b [ 75.529355][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.529363][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.529371][ T9084] __kasan_report.cold+0x1b/0x41 [ 75.529381][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.529389][ T9084] kasan_report+0x12/0x20 [ 75.529399][ T9084] __asan_report_load2_noabort+0x14/0x20 [ 75.529407][ T9084] vga16fb_imageblit+0x1c8b/0x2200 [ 75.529423][ T9084] soft_cursor+0x4fb/0xa30 [ 75.529433][ T9084] ? __lock_task_sighand+0x125/0x2f0 [ 75.529447][ T9084] bit_cursor+0x12fc/0x1a60 [ 75.529460][ T9084] ? bit_clear+0x530/0x530 [ 75.529471][ T9084] ? find_held_lock+0x35/0x130 [ 75.529487][ T9084] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 75.529496][ T9084] ? get_color+0x225/0x430 [ 75.529506][ T9084] fbcon_cursor+0x487/0x660 [ 75.529514][ T9084] ? bit_clear+0x530/0x530 [ 75.529526][ T9084] hide_cursor+0x9d/0x2b0 [ 75.529535][ T9084] redraw_screen+0x60b/0x7d0 [ 75.529543][ T9084] ? respond_string+0x2c0/0x2c0 [ 75.529556][ T9084] vc_do_resize+0x10c9/0x1460 [ 75.529564][ T9084] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.529580][ T9084] ? vc_uniscr_alloc+0xd0/0xd0 [ 75.529593][ T9084] vc_resize+0x4d/0x60 [ 75.529602][ T9084] fbcon_modechanged+0x367/0x790 [ 75.529614][ T9084] fbcon_update_vcs+0x42/0x50 [ 75.529629][ T9084] fb_set_var+0xb32/0xdd0 [ 75.529638][ T9084] ? fb_blank+0x1a0/0x1a0 [ 75.529646][ T9084] ? lock_acquire+0x190/0x410 [ 75.529660][ T9084] ? __mutex_lock+0x458/0x13c0 [ 75.529667][ T9084] ? down+0x50/0x90 [ 75.529686][ T9084] ? do_fb_ioctl+0x335/0x7d0 [ 75.529698][ T9084] do_fb_ioctl+0x390/0x7d0 [ 75.529705][ T9084] ? fb_mmap+0x520/0x520 [ 75.529713][ T9084] ? tomoyo_path_number_perm+0x214/0x520 [ 75.529722][ T9084] ? find_held_lock+0x35/0x130 [ 75.529730][ T9084] ? tomoyo_path_number_perm+0x214/0x520 [ 75.529746][ T9084] ? lock_downgrade+0x920/0x920 [ 75.529753][ T9084] ? lockdep_hardirqs_on+0x421/0x5e0 [ 75.529763][ T9084] ? tomoyo_path_number_perm+0x454/0x520 [ 75.529786][ T9084] fb_ioctl+0xe6/0x130 [ 75.529792][ T9084] ? do_fb_ioctl+0x7d0/0x7d0 [ 75.529801][ T9084] do_vfs_ioctl+0x977/0x14e0 [ 75.529811][ T9084] ? compat_ioctl_preallocate+0x220/0x220 [ 75.529820][ T9084] ? kmem_cache_free+0x26b/0x320 [ 75.529831][ T9084] ? putname+0xf4/0x130 [ 75.529840][ T9084] ? do_sys_open+0x31d/0x5d0 [ 75.529851][ T9084] ? tomoyo_file_ioctl+0x23/0x30 [ 75.529859][ T9084] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.529870][ T9084] ? security_file_ioctl+0x8d/0xc0 [ 75.529879][ T9084] ksys_ioctl+0xab/0xd0 [ 75.529889][ T9084] __x64_sys_ioctl+0x73/0xb0 [ 75.529900][ T9084] do_syscall_64+0xfa/0x790 [ 75.529911][ T9084] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.529919][ T9084] RIP: 0033:0x440309 [ 75.529929][ T9084] 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 [ 75.529934][ T9084] RSP: 002b:00007ffd28fff0d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 75.529942][ T9084] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 75.529947][ T9084] RDX: 0000000020000340 RSI: 0000000000004601 RDI: 0000000000000003 [ 75.529951][ T9084] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 75.529956][ T9084] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 75.529961][ T9084] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 75.529971][ T9084] [ 75.529974][ T9084] The buggy address belongs to the variable: [ 75.529982][ T9084] transl_h+0x38/0x40 [ 75.529984][ T9084] [ 75.529986][ T9084] Memory state around the buggy address: [ 75.529994][ T9084] ffffffff8874d300: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 75.530001][ T9084] ffffffff8874d380: 00 00 00 00 00 fa fa fa fa fa fa fa 04 fa fa fa [ 75.530006][ T9084] >ffffffff8874d400: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 75.530010][ T9084] ^ [ 75.530016][ T9084] ffffffff8874d480: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04 [ 75.530022][ T9084] ffffffff8874d500: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00 [ 75.530025][ T9084] ================================================================== [ 75.530028][ T9084] Disabling lock debugging due to kernel taint [ 75.530032][ T9084] Kernel panic - not syncing: panic_on_warn set ... [ 75.530040][ T9084] CPU: 1 PID: 9084 Comm: syz-executor797 Tainted: G B 5.4.0-syzkaller #0 [ 75.530044][ T9084] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.530046][ T9084] Call Trace: [ 75.530054][ T9084] dump_stack+0x197/0x210 [ 75.530065][ T9084] panic+0x2e3/0x75c [ 75.530072][ T9084] ? add_taint.cold+0x16/0x16 [ 75.530083][ T9084] ? trace_hardirqs_on+0x67/0x240 [ 75.530090][ T9084] ? trace_hardirqs_on+0x5e/0x240 [ 75.530098][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.530104][ T9084] end_report+0x47/0x4f [ 75.530112][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.530172][ T9084] __kasan_report.cold+0xe/0x41 [ 75.530192][ T9084] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.530199][ T9084] kasan_report+0x12/0x20 [ 75.530207][ T9084] __asan_report_load2_noabort+0x14/0x20 [ 75.530215][ T9084] vga16fb_imageblit+0x1c8b/0x2200 [ 75.530227][ T9084] soft_cursor+0x4fb/0xa30 [ 75.530236][ T9084] ? __lock_task_sighand+0x125/0x2f0 [ 75.530246][ T9084] bit_cursor+0x12fc/0x1a60 [ 75.530255][ T9084] ? bit_clear+0x530/0x530 [ 75.530264][ T9084] ? find_held_lock+0x35/0x130 [ 75.530276][ T9084] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 75.530283][ T9084] ? get_color+0x225/0x430 [ 75.530292][ T9084] fbcon_cursor+0x487/0x660 [ 75.530299][ T9084] ? bit_clear+0x530/0x530 [ 75.530308][ T9084] hide_cursor+0x9d/0x2b0 [ 75.530315][ T9084] redraw_screen+0x60b/0x7d0 [ 75.530322][ T9084] ? respond_string+0x2c0/0x2c0 [ 75.530331][ T9084] vc_do_resize+0x10c9/0x1460 [ 75.530339][ T9084] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.530350][ T9084] ? vc_uniscr_alloc+0xd0/0xd0 [ 75.530359][ T9084] vc_resize+0x4d/0x60 [ 75.530367][ T9084] fbcon_modechanged+0x367/0x790 [ 75.530377][ T9084] fbcon_update_vcs+0x42/0x50 [ 75.530383][ T9084] fb_set_var+0xb32/0xdd0 [ 75.530391][ T9084] ? fb_blank+0x1a0/0x1a0 [ 75.530398][ T9084] ? lock_acquire+0x190/0x410 [ 75.530409][ T9084] ? __mutex_lock+0x458/0x13c0 [ 75.530415][ T9084] ? down+0x50/0x90 [ 75.530428][ T9084] ? do_fb_ioctl+0x335/0x7d0 [ 75.530438][ T9084] do_fb_ioctl+0x390/0x7d0 [ 75.530445][ T9084] ? fb_mmap+0x520/0x520 [ 75.530452][ T9084] ? tomoyo_path_number_perm+0x214/0x520 [ 75.530460][ T9084] ? find_held_lock+0x35/0x130 [ 75.530467][ T9084] ? tomoyo_path_number_perm+0x214/0x520 [ 75.530476][ T9084] ? lock_downgrade+0x920/0x920 [ 75.530483][ T9084] ? lockdep_hardirqs_on+0x421/0x5e0 [ 75.530492][ T9084] ? tomoyo_path_number_perm+0x454/0x520 [ 75.530507][ T9084] fb_ioctl+0xe6/0x130 [ 75.530514][ T9084] ? do_fb_ioctl+0x7d0/0x7d0 [ 75.530522][ T9084] do_vfs_ioctl+0x977/0x14e0 [ 75.530531][ T9084] ? compat_ioctl_preallocate+0x220/0x220 [ 75.530538][ T9084] ? kmem_cache_free+0x26b/0x320 [ 75.530547][ T9084] ? putname+0xf4/0x130 [ 75.530554][ T9084] ? do_sys_open+0x31d/0x5d0 [ 75.530562][ T9084] ? tomoyo_file_ioctl+0x23/0x30 [ 75.530571][ T9084] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.530580][ T9084] ? security_file_ioctl+0x8d/0xc0 [ 75.530587][ T9084] ksys_ioctl+0xab/0xd0 [ 75.530595][ T9084] __x64_sys_ioctl+0x73/0xb0 [ 75.530604][ T9084] do_syscall_64+0xfa/0x790 [ 75.530614][ T9084] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.530621][ T9084] RIP: 0033:0x440309 [ 75.530630][ T9084] 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 [ 75.530634][ T9084] RSP: 002b:00007ffd28fff0d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 75.530642][ T9084] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 75.530647][ T9084] RDX: 0000000020000340 RSI: 0000000000004601 RDI: 0000000000000003 [ 75.530651][ T9084] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 75.530655][ T9084] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 75.530660][ T9084] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 75.532420][ T9084] Kernel Offset: disabled [ 76.398700][ T9084] Rebooting in 86400 seconds..