[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.288883] audit: type=1400 audit(1599182638.627:8): avc: denied { execmem } for pid=6469 comm="syz-executor433" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 41.333853] ================================================================== [ 41.333892] BUG: KASAN: global-out-of-bounds in fbcon_resize+0x7b5/0x860 [ 41.333903] Read of size 4 at addr ffffffff87cd6258 by task syz-executor433/6475 [ 41.333906] [ 41.333920] CPU: 1 PID: 6475 Comm: syz-executor433 Not tainted 4.19.143-syzkaller #0 [ 41.333927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.333931] Call Trace: [ 41.333946] dump_stack+0x1fc/0x2fe [ 41.333965] print_address_description.cold+0x5/0x219 [ 41.333980] kasan_report_error.cold+0x8a/0x1c7 [ 41.333993] ? fbcon_resize+0x7b5/0x860 [ 41.334005] __asan_report_load4_noabort+0x88/0x90 [ 41.334020] ? fbcon_resize+0x7b5/0x860 [ 41.334034] fbcon_resize+0x7b5/0x860 [ 41.334053] ? display_to_var+0x7b0/0x7b0 [ 41.334085] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 41.334099] ? __kmalloc+0x38e/0x3c0 [ 41.334111] ? vc_do_resize+0x2ff/0x1410 [ 41.334124] ? display_to_var+0x7b0/0x7b0 [ 41.334138] vc_do_resize+0x53e/0x1410 [ 41.334159] ? console_lock+0x25/0x80 [ 41.334176] ? redraw_screen+0x870/0x870 [ 41.334191] ? lock_acquire+0x170/0x3c0 [ 41.334204] ? vt_ioctl+0xabe/0x2580 [ 41.334224] vt_ioctl+0xb23/0x2580 [ 41.334239] ? vt_waitactive+0x350/0x350 [ 41.334256] ? avc_has_extended_perms+0x86d/0xea0 [ 41.334271] ? futex_wake+0x159/0x480 [ 41.334289] ? avc_ss_reset+0x170/0x170 [ 41.334301] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 41.334318] ? tty_jobctrl_ioctl+0x4d/0xed0 [ 41.334330] ? vt_waitactive+0x350/0x350 [ 41.334343] tty_ioctl+0x5b0/0x15c0 [ 41.334357] ? tty_fasync+0x300/0x300 [ 41.334369] ? do_futex+0x163/0x1c40 [ 41.334384] ? mark_held_locks+0xf0/0xf0 [ 41.334400] ? __lock_acquire+0x6de/0x3ff0 [ 41.334418] ? exit_robust_list+0x2e0/0x2e0 [ 41.334432] ? __lock_acquire+0x6de/0x3ff0 [ 41.334445] ? tty_fasync+0x300/0x300 [ 41.334462] do_vfs_ioctl+0xcdb/0x12e0 [ 41.334483] ? selinux_file_ioctl+0x506/0x6c0 [ 41.334498] ? ioctl_preallocate+0x200/0x200 [ 41.334512] ? selinux_inode_link+0x20/0x20 [ 41.334529] ? __fget+0x356/0x510 [ 41.334562] ? do_dup2+0x450/0x450 [ 41.334585] ? __se_sys_futex+0x298/0x3b0 [ 41.334607] ksys_ioctl+0x9b/0xc0 [ 41.334624] __x64_sys_ioctl+0x6f/0xb0 [ 41.334637] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 41.334651] do_syscall_64+0xf9/0x620 [ 41.334669] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.334680] RIP: 0033:0x445959 [ 41.334692] Code: e8 fc b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 41.334699] RSP: 002b:00007fca8681edb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 41.334712] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445959 [ 41.334720] RDX: 0000000020001740 RSI: 0000000000005609 RDI: 0000000000000004 [ 41.334727] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 41.334734] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 41.334742] R13: 00007ffe7f98542f R14: 00007fca8681f9c0 R15: 20c49ba5e353f7cf [ 41.334760] [ 41.334764] The buggy address belongs to the variable: [ 41.334774] font_vga_8x16+0x58/0x60 [ 41.334777] [ 41.334781] Memory state around the buggy address: [ 41.334792] ffffffff87cd6100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.334802] ffffffff87cd6180: 00 00 00 00 fa fa fa fa 00 fa fa fa fa fa fa fa [ 41.334811] >ffffffff87cd6200: 00 00 00 00 00 fa fa fa fa fa fa fa 00 00 00 00 [ 41.334816] ^ [ 41.334825] ffffffff87cd6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.334834] ffffffff87cd6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 41.334839] ================================================================== [ 41.334843] Disabling lock debugging due to kernel taint [ 41.334849] Kernel panic - not syncing: panic_on_warn set ... [ 41.334849] [ 41.334861] CPU: 1 PID: 6475 Comm: syz-executor433 Tainted: G B 4.19.143-syzkaller #0 [ 41.334867] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.334870] Call Trace: [ 41.334881] dump_stack+0x1fc/0x2fe [ 41.334895] panic+0x26a/0x50e [ 41.334906] ? __warn_printk+0xf3/0xf3 [ 41.334921] ? lock_downgrade+0x720/0x720 [ 41.334934] ? print_shadow_for_address+0xb8/0x114 [ 41.334946] ? trace_hardirqs_on+0x55/0x210 [ 41.334960] kasan_end_report+0x43/0x49 [ 41.334973] kasan_report_error.cold+0xa7/0x1c7 [ 41.334986] ? fbcon_resize+0x7b5/0x860 [ 41.334997] __asan_report_load4_noabort+0x88/0x90 [ 41.335012] ? fbcon_resize+0x7b5/0x860 [ 41.335025] fbcon_resize+0x7b5/0x860 [ 41.335041] ? display_to_var+0x7b0/0x7b0 [ 41.335065] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 41.335076] ? __kmalloc+0x38e/0x3c0 [ 41.335087] ? vc_do_resize+0x2ff/0x1410 [ 41.335099] ? display_to_var+0x7b0/0x7b0 [ 41.335112] vc_do_resize+0x53e/0x1410 [ 41.335129] ? console_lock+0x25/0x80 [ 41.335143] ? redraw_screen+0x870/0x870 [ 41.335157] ? lock_acquire+0x170/0x3c0 [ 41.335168] ? vt_ioctl+0xabe/0x2580 [ 41.335184] vt_ioctl+0xb23/0x2580 [ 41.335198] ? vt_waitactive+0x350/0x350 [ 41.335212] ? avc_has_extended_perms+0x86d/0xea0 [ 41.335224] ? futex_wake+0x159/0x480 [ 41.335240] ? avc_ss_reset+0x170/0x170 [ 41.335251] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 41.335266] ? tty_jobctrl_ioctl+0x4d/0xed0 [ 41.335278] ? vt_waitactive+0x350/0x350 [ 41.335290] tty_ioctl+0x5b0/0x15c0 [ 41.335303] ? tty_fasync+0x300/0x300 [ 41.335314] ? do_futex+0x163/0x1c40 [ 41.335328] ? mark_held_locks+0xf0/0xf0 [ 41.335343] ? __lock_acquire+0x6de/0x3ff0 [ 41.335358] ? exit_robust_list+0x2e0/0x2e0 [ 41.335371] ? __lock_acquire+0x6de/0x3ff0 [ 41.335383] ? tty_fasync+0x300/0x300 [ 41.335397] do_vfs_ioctl+0xcdb/0x12e0 [ 41.335411] ? selinux_file_ioctl+0x506/0x6c0 [ 41.335424] ? ioctl_preallocate+0x200/0x200 [ 41.335438] ? selinux_inode_link+0x20/0x20 [ 41.335452] ? __fget+0x356/0x510 [ 41.335467] ? do_dup2+0x450/0x450 [ 41.335479] ? __se_sys_futex+0x298/0x3b0 [ 41.335497] ksys_ioctl+0x9b/0xc0 [ 41.335511] __x64_sys_ioctl+0x6f/0xb0 [ 41.335524] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 41.335537] do_syscall_64+0xf9/0x620 [ 41.335552] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.335560] RIP: 0033:0x445959 [ 41.335581] Code: e8 fc b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 41.335587] RSP: 002b:00007fca8681edb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 41.335598] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445959 [ 41.335604] RDX: 0000000020001740 RSI: 0000000000005609 RDI: 0000000000000004 [ 41.335611] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 41.335618] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 41.335626] R13: 00007ffe7f98542f R14: 00007fca8681f9c0 R15: 20c49ba5e353f7cf [ 41.336940] Kernel Offset: disabled [ 42.007079] Rebooting in 86400 seconds..