[ 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 '10.128.0.133' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.175151] audit: type=1400 audit(1598802025.521:8): avc: denied { execmem } for pid=6463 comm="syz-executor463" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 37.251850] ================================================================== [ 37.251879] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1d01/0x2260 [ 37.251886] Read of size 2 at addr ffffffff87cfe17e by task syz-executor463/6463 [ 37.251888] [ 37.251897] CPU: 1 PID: 6463 Comm: syz-executor463 Not tainted 4.19.142-syzkaller #0 [ 37.251901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.251904] Call Trace: [ 37.251915] dump_stack+0x1fc/0x2fe [ 37.251927] print_address_description.cold+0x5/0x219 [ 37.251936] kasan_report_error.cold+0x8a/0x1c7 [ 37.251944] ? vga16fb_imageblit+0x1d01/0x2260 [ 37.251951] __asan_report_load2_noabort+0x88/0x90 [ 37.251960] ? vga16fb_imageblit+0x1d01/0x2260 [ 37.251968] vga16fb_imageblit+0x1d01/0x2260 [ 37.251979] ? trace_hardirqs_off+0xef/0x200 [ 37.251987] ? fb_pad_aligned_buffer+0x13f/0x150 [ 37.251997] soft_cursor+0x514/0xa30 [ 37.252009] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.252017] bit_cursor+0x1239/0x1820 [ 37.252028] ? bit_update_start+0x1f0/0x1f0 [ 37.252035] ? fbcon_putcs+0x336/0x4f0 [ 37.252045] ? do_update_region+0x47c/0x630 [ 37.252053] ? fb_get_color_depth+0x11a/0x240 [ 37.252061] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 37.252069] ? get_color+0x20e/0x410 [ 37.252078] fbcon_cursor+0x555/0x760 [ 37.252084] ? bit_update_start+0x1f0/0x1f0 [ 37.252092] ? fbcon_set_palette+0x4d0/0x5f0 [ 37.252100] set_cursor+0x1dd/0x230 [ 37.252107] redraw_screen+0x5ee/0x870 [ 37.252115] ? vga16fb_update_fix+0x4a0/0x4a0 [ 37.252122] ? vc_init+0x440/0x440 [ 37.252131] ? fbcon_set_palette+0x4d0/0x5f0 [ 37.252141] fbcon_modechanged+0x6e9/0x9f0 [ 37.252152] fbcon_event_notify+0x197/0x1d80 [ 37.252163] notifier_call_chain+0xc0/0x230 [ 37.252174] blocking_notifier_call_chain+0x85/0xa0 [ 37.252182] fb_set_var+0xc51/0xe20 [ 37.252190] ? fb_set_suspend+0x130/0x130 [ 37.252197] ? __lock_acquire+0x6de/0x3ff0 [ 37.252209] ? lock_acquire+0x170/0x3c0 [ 37.252215] ? do_fb_ioctl+0x350/0xb50 [ 37.252230] ? _raw_spin_unlock_irq+0x24/0x80 [ 37.252246] ? lock_acquire+0x170/0x3c0 [ 37.252252] ? do_fb_ioctl+0x33e/0xb50 [ 37.252263] do_fb_ioctl+0x3cf/0xb50 [ 37.252271] ? register_framebuffer+0x9e0/0x9e0 [ 37.252279] ? avc_has_extended_perms+0xe4/0xea0 [ 37.252287] ? check_preemption_disabled+0x41/0x280 [ 37.252298] ? avc_has_extended_perms+0x86d/0xea0 [ 37.252306] ? __save_stack_trace+0xaf/0x190 [ 37.252316] ? avc_ss_reset+0x170/0x170 [ 37.252324] ? trace_hardirqs_off+0x64/0x200 [ 37.252331] ? __kasan_slab_free+0x186/0x1f0 [ 37.252340] ? kmem_cache_free+0x7f/0x260 [ 37.252346] ? putname+0xe1/0x120 [ 37.252360] ? debug_check_no_obj_freed+0x201/0x482 [ 37.252369] ? lock_downgrade+0x720/0x720 [ 37.252376] ? lock_acquire+0x170/0x3c0 [ 37.252385] fb_ioctl+0xdd/0x130 [ 37.252391] ? do_fb_ioctl+0xb50/0xb50 [ 37.252399] do_vfs_ioctl+0xcdb/0x12e0 [ 37.252407] ? selinux_file_ioctl+0x506/0x6c0 [ 37.252415] ? ioctl_preallocate+0x200/0x200 [ 37.252423] ? selinux_inode_link+0x20/0x20 [ 37.252431] ? putname+0xe1/0x120 [ 37.252440] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 37.252448] ? putname+0xe1/0x120 [ 37.252461] ksys_ioctl+0x9b/0xc0 [ 37.252471] __x64_sys_ioctl+0x6f/0xb0 [ 37.252478] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.252493] do_syscall_64+0xf9/0x620 [ 37.252502] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.252509] RIP: 0033:0x4403d9 [ 37.252517] 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 37.252521] RSP: 002b:00007ffe3f806728 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 37.252529] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403d9 [ 37.252533] RDX: 00000000200000c0 RSI: 0000000000004601 RDI: 0000000000000003 [ 37.252537] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 37.252541] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401be0 [ 37.252545] R13: 0000000000401c70 R14: 0000000000000000 R15: 0000000000000000 [ 37.252554] [ 37.252557] The buggy address belongs to the variable: [ 37.252564] transl_h+0x3e/0x40 [ 37.252566] [ 37.252568] Memory state around the buggy address: [ 37.252575] ffffffff87cfe000: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 37.252580] ffffffff87cfe080: fa fa fa fa 00 00 00 00 00 fa fa fa fa fa fa fa [ 37.252585] >ffffffff87cfe100: 04 fa fa fa fa fa fa fa 00 00 00 00 fa fa fa fa [ 37.252588] ^ [ 37.252593] ffffffff87cfe180: 00 00 00 00 fa fa fa fa 00 01 fa fa fa fa fa fa [ 37.252598] ffffffff87cfe200: 00 00 00 04 fa fa fa fa 00 00 04 fa fa fa fa fa [ 37.252601] ================================================================== [ 37.252603] Disabling lock debugging due to kernel taint [ 37.252607] Kernel panic - not syncing: panic_on_warn set ... [ 37.252607] [ 37.252614] CPU: 1 PID: 6463 Comm: syz-executor463 Tainted: G B 4.19.142-syzkaller #0 [ 37.252618] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.252619] Call Trace: [ 37.252627] dump_stack+0x1fc/0x2fe [ 37.252635] panic+0x26a/0x50e [ 37.252641] ? __warn_printk+0xf3/0xf3 [ 37.252649] ? lock_downgrade+0x720/0x720 [ 37.252656] ? print_shadow_for_address+0xb8/0x114 [ 37.252662] ? trace_hardirqs_on+0x55/0x210 [ 37.252670] kasan_end_report+0x43/0x49 [ 37.252676] kasan_report_error.cold+0xa7/0x1c7 [ 37.252684] ? vga16fb_imageblit+0x1d01/0x2260 [ 37.252690] __asan_report_load2_noabort+0x88/0x90 [ 37.252698] ? vga16fb_imageblit+0x1d01/0x2260 [ 37.252705] vga16fb_imageblit+0x1d01/0x2260 [ 37.252713] ? trace_hardirqs_off+0xef/0x200 [ 37.252719] ? fb_pad_aligned_buffer+0x13f/0x150 [ 37.252726] soft_cursor+0x514/0xa30 [ 37.252735] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.252741] bit_cursor+0x1239/0x1820 [ 37.252749] ? bit_update_start+0x1f0/0x1f0 [ 37.252756] ? fbcon_putcs+0x336/0x4f0 [ 37.252763] ? do_update_region+0x47c/0x630 [ 37.252770] ? fb_get_color_depth+0x11a/0x240 [ 37.252776] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 37.252783] ? get_color+0x20e/0x410 [ 37.252791] fbcon_cursor+0x555/0x760 [ 37.252796] ? bit_update_start+0x1f0/0x1f0 [ 37.252803] ? fbcon_set_palette+0x4d0/0x5f0 [ 37.252810] set_cursor+0x1dd/0x230 [ 37.252816] redraw_screen+0x5ee/0x870 [ 37.252823] ? vga16fb_update_fix+0x4a0/0x4a0 [ 37.252830] ? vc_init+0x440/0x440 [ 37.252838] ? fbcon_set_palette+0x4d0/0x5f0 [ 37.252846] fbcon_modechanged+0x6e9/0x9f0 [ 37.252855] fbcon_event_notify+0x197/0x1d80 [ 37.252862] notifier_call_chain+0xc0/0x230 [ 37.252871] blocking_notifier_call_chain+0x85/0xa0 [ 37.252877] fb_set_var+0xc51/0xe20 [ 37.252885] ? fb_set_suspend+0x130/0x130 [ 37.252891] ? __lock_acquire+0x6de/0x3ff0 [ 37.252900] ? lock_acquire+0x170/0x3c0 [ 37.252906] ? do_fb_ioctl+0x350/0xb50 [ 37.252915] ? _raw_spin_unlock_irq+0x24/0x80 [ 37.252926] ? lock_acquire+0x170/0x3c0 [ 37.252932] ? do_fb_ioctl+0x33e/0xb50 [ 37.252941] do_fb_ioctl+0x3cf/0xb50 [ 37.252948] ? register_framebuffer+0x9e0/0x9e0 [ 37.252955] ? avc_has_extended_perms+0xe4/0xea0 [ 37.252961] ? check_preemption_disabled+0x41/0x280 [ 37.252970] ? avc_has_extended_perms+0x86d/0xea0 [ 37.252976] ? __save_stack_trace+0xaf/0x190 [ 37.252984] ? avc_ss_reset+0x170/0x170 [ 37.252991] ? trace_hardirqs_off+0x64/0x200 [ 37.252998] ? __kasan_slab_free+0x186/0x1f0 [ 37.253005] ? kmem_cache_free+0x7f/0x260 [ 37.253010] ? putname+0xe1/0x120 [ 37.253020] ? debug_check_no_obj_freed+0x201/0x482 [ 37.253028] ? lock_downgrade+0x720/0x720 [ 37.253035] ? lock_acquire+0x170/0x3c0 [ 37.253041] fb_ioctl+0xdd/0x130 [ 37.253047] ? do_fb_ioctl+0xb50/0xb50 [ 37.253054] do_vfs_ioctl+0xcdb/0x12e0 [ 37.253062] ? selinux_file_ioctl+0x506/0x6c0 [ 37.253069] ? ioctl_preallocate+0x200/0x200 [ 37.253076] ? selinux_inode_link+0x20/0x20 [ 37.253083] ? putname+0xe1/0x120 [ 37.253090] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 37.253096] ? putname+0xe1/0x120 [ 37.253106] ksys_ioctl+0x9b/0xc0 [ 37.253114] __x64_sys_ioctl+0x6f/0xb0 [ 37.253121] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.253127] do_syscall_64+0xf9/0x620 [ 37.253136] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.253140] RIP: 0033:0x4403d9 [ 37.253146] 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 37.253149] RSP: 002b:00007ffe3f806728 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 37.253155] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403d9 [ 37.253159] RDX: 00000000200000c0 RSI: 0000000000004601 RDI: 0000000000000003 [ 37.253163] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 37.253167] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401be0 [ 37.253170] R13: 0000000000401c70 R14: 0000000000000000 R15: 0000000000000000 [ 37.254401] Kernel Offset: disabled [ 38.111452] Rebooting in 86400 seconds..