[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.141435][ T26] audit: type=1800 audit(1576509599.880:25): pid=8921 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.161365][ T26] audit: type=1800 audit(1576509599.890:26): pid=8921 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.221286][ T26] audit: type=1800 audit(1576509599.890:27): pid=8921 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 '10.128.0.121' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.313767][ T9073] ================================================================== [ 75.313807][ T9073] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 75.313815][ T9073] Read of size 2 at addr ffffffff88752218 by task syz-executor989/9073 [ 75.313818][ T9073] [ 75.313828][ T9073] CPU: 0 PID: 9073 Comm: syz-executor989 Not tainted 5.5.0-rc1-next-20191213-syzkaller #0 [ 75.313834][ T9073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.313837][ T9073] Call Trace: [ 75.313848][ T9073] dump_stack+0x197/0x210 [ 75.313856][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.313869][ T9073] print_address_description.constprop.0.cold+0x5/0x30b [ 75.313876][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.313883][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.313892][ T9073] __kasan_report.cold+0x1b/0x41 [ 75.313901][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.313911][ T9073] kasan_report+0x12/0x20 [ 75.313920][ T9073] __asan_report_load2_noabort+0x14/0x20 [ 75.313927][ T9073] vga16fb_imageblit+0x1c8b/0x2200 [ 75.313943][ T9073] soft_cursor+0x4fb/0xa30 [ 75.313954][ T9073] ? __lock_task_sighand+0x125/0x2f0 [ 75.313967][ T9073] bit_cursor+0x12fc/0x1a60 [ 75.313980][ T9073] ? bit_clear+0x530/0x530 [ 75.313987][ T9073] ? find_held_lock+0x35/0x130 [ 75.314003][ T9073] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 75.314011][ T9073] ? get_color+0x225/0x430 [ 75.314020][ T9073] fbcon_cursor+0x487/0x660 [ 75.314028][ T9073] ? bit_clear+0x530/0x530 [ 75.314040][ T9073] hide_cursor+0x9d/0x2b0 [ 75.314050][ T9073] redraw_screen+0x60b/0x7d0 [ 75.314061][ T9073] ? respond_string+0x2c0/0x2c0 [ 75.314073][ T9073] vc_do_resize+0x10c9/0x1460 [ 75.314081][ T9073] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.314099][ T9073] ? vc_uniscr_alloc+0xd0/0xd0 [ 75.314117][ T9073] vc_resize+0x4d/0x60 [ 75.314125][ T9073] fbcon_modechanged+0x367/0x790 [ 75.314137][ T9073] fbcon_update_vcs+0x42/0x50 [ 75.314145][ T9073] fb_set_var+0xb32/0xdd0 [ 75.314155][ T9073] ? fb_blank+0x1a0/0x1a0 [ 75.314163][ T9073] ? lock_acquire+0x190/0x410 [ 75.314176][ T9073] ? __mutex_lock+0x458/0x13c0 [ 75.314184][ T9073] ? down+0x50/0x90 [ 75.314204][ T9073] ? do_fb_ioctl+0x335/0x7d0 [ 75.314218][ T9073] do_fb_ioctl+0x390/0x7d0 [ 75.314226][ T9073] ? fb_mmap+0x520/0x520 [ 75.314236][ T9073] ? tomoyo_path_number_perm+0x214/0x520 [ 75.314244][ T9073] ? find_held_lock+0x35/0x130 [ 75.314253][ T9073] ? tomoyo_path_number_perm+0x214/0x520 [ 75.314264][ T9073] ? lock_downgrade+0x920/0x920 [ 75.314271][ T9073] ? lockdep_hardirqs_on+0x421/0x5e0 [ 75.314282][ T9073] ? tomoyo_path_number_perm+0x454/0x520 [ 75.314304][ T9073] ? trace_hardirqs_on+0x67/0x240 [ 75.314315][ T9073] fb_ioctl+0xe6/0x130 [ 75.314323][ T9073] ? do_fb_ioctl+0x7d0/0x7d0 [ 75.314332][ T9073] do_vfs_ioctl+0x977/0x14e0 [ 75.314343][ T9073] ? compat_ioctl_preallocate+0x220/0x220 [ 75.314351][ T9073] ? chown_common+0x5c0/0x5c0 [ 75.314361][ T9073] ? __kasan_check_write+0x14/0x20 [ 75.314369][ T9073] ? up_read+0x1cd/0x810 [ 75.314383][ T9073] ? tomoyo_file_ioctl+0x23/0x30 [ 75.314391][ T9073] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.314400][ T9073] ? security_file_ioctl+0x8d/0xc0 [ 75.314409][ T9073] ksys_ioctl+0xab/0xd0 [ 75.314419][ T9073] __x64_sys_ioctl+0x73/0xb0 [ 75.314430][ T9073] do_syscall_64+0xfa/0x790 [ 75.314441][ T9073] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.314449][ T9073] RIP: 0033:0x440309 [ 75.314458][ T9073] 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 [ 75.314462][ T9073] RSP: 002b:00007ffca76c49e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 75.314470][ T9073] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 75.314475][ T9073] RDX: 0000000020000340 RSI: 0000000000004601 RDI: 0000000000000003 [ 75.314480][ T9073] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 75.314484][ T9073] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 75.314489][ T9073] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 75.314499][ T9073] [ 75.314502][ T9073] The buggy address belongs to the variable: [ 75.314509][ T9073] transl_h+0x38/0x40 [ 75.314512][ T9073] [ 75.314514][ T9073] Memory state around the buggy address: [ 75.314522][ T9073] ffffffff88752100: 00 00 00 00 fa fa fa fa 00 00 00 00 00 fa fa fa [ 75.314528][ T9073] ffffffff88752180: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 [ 75.314534][ T9073] >ffffffff88752200: fa fa fa fa 00 00 00 00 fa fa fa fa 00 01 fa fa [ 75.314537][ T9073] ^ [ 75.314543][ T9073] ffffffff88752280: fa fa fa fa 00 00 00 04 fa fa fa fa 00 00 04 fa [ 75.314549][ T9073] ffffffff88752300: fa fa fa fa 00 00 00 00 00 00 02 fa fa fa fa fa [ 75.314552][ T9073] ================================================================== [ 75.314555][ T9073] Disabling lock debugging due to kernel taint [ 75.314559][ T9073] Kernel panic - not syncing: panic_on_warn set ... [ 75.314567][ T9073] CPU: 0 PID: 9073 Comm: syz-executor989 Tainted: G B 5.5.0-rc1-next-20191213-syzkaller #0 [ 75.314571][ T9073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.314573][ T9073] Call Trace: [ 75.314579][ T9073] dump_stack+0x197/0x210 [ 75.314589][ T9073] panic+0x2e3/0x75c [ 75.314596][ T9073] ? add_taint.cold+0x16/0x16 [ 75.314606][ T9073] ? trace_hardirqs_on+0x67/0x240 [ 75.314613][ T9073] ? trace_hardirqs_on+0x5e/0x240 [ 75.314621][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.314628][ T9073] end_report+0x47/0x4f [ 75.314635][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.314642][ T9073] __kasan_report.cold+0xe/0x41 [ 75.314649][ T9073] ? vga16fb_imageblit+0x1c8b/0x2200 [ 75.314657][ T9073] kasan_report+0x12/0x20 [ 75.314665][ T9073] __asan_report_load2_noabort+0x14/0x20 [ 75.314672][ T9073] vga16fb_imageblit+0x1c8b/0x2200 [ 75.314682][ T9073] soft_cursor+0x4fb/0xa30 [ 75.314690][ T9073] ? __lock_task_sighand+0x125/0x2f0 [ 75.314700][ T9073] bit_cursor+0x12fc/0x1a60 [ 75.314709][ T9073] ? bit_clear+0x530/0x530 [ 75.314715][ T9073] ? find_held_lock+0x35/0x130 [ 75.314725][ T9073] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 75.314732][ T9073] ? get_color+0x225/0x430 [ 75.314739][ T9073] fbcon_cursor+0x487/0x660 [ 75.314746][ T9073] ? bit_clear+0x530/0x530 [ 75.314754][ T9073] hide_cursor+0x9d/0x2b0 [ 75.314763][ T9073] redraw_screen+0x60b/0x7d0 [ 75.314771][ T9073] ? respond_string+0x2c0/0x2c0 [ 75.314780][ T9073] vc_do_resize+0x10c9/0x1460 [ 75.314788][ T9073] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.314800][ T9073] ? vc_uniscr_alloc+0xd0/0xd0 [ 75.314809][ T9073] vc_resize+0x4d/0x60 [ 75.314816][ T9073] fbcon_modechanged+0x367/0x790 [ 75.314825][ T9073] fbcon_update_vcs+0x42/0x50 [ 75.314832][ T9073] fb_set_var+0xb32/0xdd0 [ 75.314840][ T9073] ? fb_blank+0x1a0/0x1a0 [ 75.314846][ T9073] ? lock_acquire+0x190/0x410 [ 75.314856][ T9073] ? __mutex_lock+0x458/0x13c0 [ 75.314863][ T9073] ? down+0x50/0x90 [ 75.314876][ T9073] ? do_fb_ioctl+0x335/0x7d0 [ 75.314885][ T9073] do_fb_ioctl+0x390/0x7d0 [ 75.314893][ T9073] ? fb_mmap+0x520/0x520 [ 75.314900][ T9073] ? tomoyo_path_number_perm+0x214/0x520 [ 75.314906][ T9073] ? find_held_lock+0x35/0x130 [ 75.314915][ T9073] ? tomoyo_path_number_perm+0x214/0x520 [ 75.314923][ T9073] ? lock_downgrade+0x920/0x920 [ 75.314929][ T9073] ? lockdep_hardirqs_on+0x421/0x5e0 [ 75.314938][ T9073] ? tomoyo_path_number_perm+0x454/0x520 [ 75.314951][ T9073] ? trace_hardirqs_on+0x67/0x240 [ 75.314960][ T9073] fb_ioctl+0xe6/0x130 [ 75.314967][ T9073] ? do_fb_ioctl+0x7d0/0x7d0 [ 75.314974][ T9073] do_vfs_ioctl+0x977/0x14e0 [ 75.314983][ T9073] ? compat_ioctl_preallocate+0x220/0x220 [ 75.314988][ T9073] ? chown_common+0x5c0/0x5c0 [ 75.314996][ T9073] ? __kasan_check_write+0x14/0x20 [ 75.315004][ T9073] ? up_read+0x1cd/0x810 [ 75.315014][ T9073] ? tomoyo_file_ioctl+0x23/0x30 [ 75.315022][ T9073] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.315028][ T9073] ? security_file_ioctl+0x8d/0xc0 [ 75.315036][ T9073] ksys_ioctl+0xab/0xd0 [ 75.315044][ T9073] __x64_sys_ioctl+0x73/0xb0 [ 75.315052][ T9073] do_syscall_64+0xfa/0x790 [ 75.315061][ T9073] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.315066][ T9073] RIP: 0033:0x440309 [ 75.315073][ T9073] 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 [ 75.315076][ T9073] RSP: 002b:00007ffca76c49e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 75.315082][ T9073] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 75.315086][ T9073] RDX: 0000000020000340 RSI: 0000000000004601 RDI: 0000000000000003 [ 75.315090][ T9073] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 75.315094][ T9073] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 75.315098][ T9073] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 75.316534][ T9073] Kernel Offset: disabled [ 76.192609][ T9073] Rebooting in 86400 seconds..