[ OK ] Started System Logging Service. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.708914] audit: type=1400 audit(1598996730.446:8): avc: denied { execmem } for pid=6462 comm="syz-executor938" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 36.786029] ================================================================== [ 36.786059] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1d01/0x2260 [ 36.786065] Read of size 2 at addr ffffffff87cfe17e by task syz-executor938/6462 [ 36.786067] [ 36.786076] CPU: 0 PID: 6462 Comm: syz-executor938 Not tainted 4.19.142-syzkaller #0 [ 36.786080] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.786083] Call Trace: [ 36.786096] dump_stack+0x1fc/0x2fe [ 36.786107] print_address_description.cold+0x5/0x219 [ 36.786116] kasan_report_error.cold+0x8a/0x1c7 [ 36.786125] ? vga16fb_imageblit+0x1d01/0x2260 [ 36.786132] __asan_report_load2_noabort+0x88/0x90 [ 36.786140] ? vga16fb_imageblit+0x1d01/0x2260 [ 36.786149] vga16fb_imageblit+0x1d01/0x2260 [ 36.786160] ? trace_hardirqs_off+0xef/0x200 [ 36.786168] ? fb_pad_aligned_buffer+0x13f/0x150 [ 36.786177] soft_cursor+0x514/0xa30 [ 36.786189] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.786197] bit_cursor+0x1239/0x1820 [ 36.786208] ? bit_update_start+0x1f0/0x1f0 [ 36.786215] ? fbcon_putcs+0x336/0x4f0 [ 36.786226] ? do_update_region+0x47c/0x630 [ 36.786233] ? fb_get_color_depth+0x11a/0x240 [ 36.786241] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 36.786249] ? get_color+0x20e/0x410 [ 36.786259] fbcon_cursor+0x555/0x760 [ 36.786265] ? bit_update_start+0x1f0/0x1f0 [ 36.786272] ? fbcon_set_palette+0x4d0/0x5f0 [ 36.786280] set_cursor+0x1dd/0x230 [ 36.786288] redraw_screen+0x5ee/0x870 [ 36.786295] ? vga16fb_update_fix+0x4a0/0x4a0 [ 36.786302] ? vc_init+0x440/0x440 [ 36.786312] ? fbcon_set_palette+0x4d0/0x5f0 [ 36.786322] fbcon_modechanged+0x6e9/0x9f0 [ 36.786333] fbcon_event_notify+0x197/0x1d80 [ 36.786344] notifier_call_chain+0xc0/0x230 [ 36.786354] blocking_notifier_call_chain+0x85/0xa0 [ 36.786362] fb_set_var+0xc51/0xe20 [ 36.786371] ? fb_set_suspend+0x130/0x130 [ 36.786378] ? __lock_acquire+0x6de/0x3ff0 [ 36.786389] ? lock_acquire+0x170/0x3c0 [ 36.786396] ? do_fb_ioctl+0x350/0xb50 [ 36.786410] ? _raw_spin_unlock_irq+0x24/0x80 [ 36.786425] ? lock_acquire+0x170/0x3c0 [ 36.786432] ? do_fb_ioctl+0x33e/0xb50 [ 36.786443] do_fb_ioctl+0x3cf/0xb50 [ 36.786451] ? register_framebuffer+0x9e0/0x9e0 [ 36.786461] ? avc_has_extended_perms+0xe4/0xea0 [ 36.786468] ? check_preemption_disabled+0x41/0x280 [ 36.786479] ? avc_has_extended_perms+0x86d/0xea0 [ 36.786487] ? __save_stack_trace+0xaf/0x190 [ 36.786497] ? avc_ss_reset+0x170/0x170 [ 36.786510] ? trace_hardirqs_off+0x64/0x200 [ 36.786518] ? __kasan_slab_free+0x186/0x1f0 [ 36.786527] ? kmem_cache_free+0x7f/0x260 [ 36.786534] ? putname+0xe1/0x120 [ 36.786547] ? debug_check_no_obj_freed+0x201/0x482 [ 36.786557] ? lock_downgrade+0x720/0x720 [ 36.786564] ? lock_acquire+0x170/0x3c0 [ 36.786573] fb_ioctl+0xdd/0x130 [ 36.786579] ? do_fb_ioctl+0xb50/0xb50 [ 36.786587] do_vfs_ioctl+0xcdb/0x12e0 [ 36.786596] ? selinux_file_ioctl+0x506/0x6c0 [ 36.786604] ? ioctl_preallocate+0x200/0x200 [ 36.786612] ? selinux_inode_link+0x20/0x20 [ 36.786620] ? putname+0xe1/0x120 [ 36.786628] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 36.786637] ? putname+0xe1/0x120 [ 36.786650] ksys_ioctl+0x9b/0xc0 [ 36.786659] __x64_sys_ioctl+0x6f/0xb0 [ 36.786667] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.786675] do_syscall_64+0xf9/0x620 [ 36.786685] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.786691] RIP: 0033:0x4403d9 [ 36.786699] 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 [ 36.786703] RSP: 002b:00007ffcb72f6508 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 36.786710] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403d9 [ 36.786714] RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000003 [ 36.786718] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 36.786722] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401be0 [ 36.786726] R13: 0000000000401c70 R14: 0000000000000000 R15: 0000000000000000 [ 36.786735] [ 36.786738] The buggy address belongs to the variable: [ 36.786746] transl_h+0x3e/0x40 [ 36.786747] [ 36.786749] Memory state around the buggy address: [ 36.786756] ffffffff87cfe000: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 36.786761] ffffffff87cfe080: fa fa fa fa 00 00 00 00 00 fa fa fa fa fa fa fa [ 36.786766] >ffffffff87cfe100: 04 fa fa fa fa fa fa fa 00 00 00 00 fa fa fa fa [ 36.786769] ^ [ 36.786775] ffffffff87cfe180: 00 00 00 00 fa fa fa fa 00 01 fa fa fa fa fa fa [ 36.786780] ffffffff87cfe200: 00 00 00 04 fa fa fa fa 00 00 04 fa fa fa fa fa [ 36.786782] ================================================================== [ 36.786785] Disabling lock debugging due to kernel taint [ 36.786788] Kernel panic - not syncing: panic_on_warn set ... [ 36.786788] [ 36.786795] CPU: 0 PID: 6462 Comm: syz-executor938 Tainted: G B 4.19.142-syzkaller #0 [ 36.786799] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.786801] Call Trace: [ 36.786808] dump_stack+0x1fc/0x2fe [ 36.786816] panic+0x26a/0x50e [ 36.786822] ? __warn_printk+0xf3/0xf3 [ 36.786830] ? lock_downgrade+0x720/0x720 [ 36.786838] ? print_shadow_for_address+0xb8/0x114 [ 36.786843] ? trace_hardirqs_on+0x55/0x210 [ 36.786851] kasan_end_report+0x43/0x49 [ 36.786858] kasan_report_error.cold+0xa7/0x1c7 [ 36.786865] ? vga16fb_imageblit+0x1d01/0x2260 [ 36.786871] __asan_report_load2_noabort+0x88/0x90 [ 36.786879] ? vga16fb_imageblit+0x1d01/0x2260 [ 36.786887] vga16fb_imageblit+0x1d01/0x2260 [ 36.786894] ? trace_hardirqs_off+0xef/0x200 [ 36.786901] ? fb_pad_aligned_buffer+0x13f/0x150 [ 36.786908] soft_cursor+0x514/0xa30 [ 36.786917] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.786923] bit_cursor+0x1239/0x1820 [ 36.786931] ? bit_update_start+0x1f0/0x1f0 [ 36.786938] ? fbcon_putcs+0x336/0x4f0 [ 36.786945] ? do_update_region+0x47c/0x630 [ 36.786952] ? fb_get_color_depth+0x11a/0x240 [ 36.786958] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 36.786965] ? get_color+0x20e/0x410 [ 36.786973] fbcon_cursor+0x555/0x760 [ 36.786979] ? bit_update_start+0x1f0/0x1f0 [ 36.786986] ? fbcon_set_palette+0x4d0/0x5f0 [ 36.786992] set_cursor+0x1dd/0x230 [ 36.786999] redraw_screen+0x5ee/0x870 [ 36.787006] ? vga16fb_update_fix+0x4a0/0x4a0 [ 36.787012] ? vc_init+0x440/0x440 [ 36.787020] ? fbcon_set_palette+0x4d0/0x5f0 [ 36.787028] fbcon_modechanged+0x6e9/0x9f0 [ 36.787037] fbcon_event_notify+0x197/0x1d80 [ 36.787045] notifier_call_chain+0xc0/0x230 [ 36.787053] blocking_notifier_call_chain+0x85/0xa0 [ 36.787060] fb_set_var+0xc51/0xe20 [ 36.787067] ? fb_set_suspend+0x130/0x130 [ 36.787074] ? __lock_acquire+0x6de/0x3ff0 [ 36.787083] ? lock_acquire+0x170/0x3c0 [ 36.787089] ? do_fb_ioctl+0x350/0xb50 [ 36.787098] ? _raw_spin_unlock_irq+0x24/0x80 [ 36.787109] ? lock_acquire+0x170/0x3c0 [ 36.787115] ? do_fb_ioctl+0x33e/0xb50 [ 36.787124] do_fb_ioctl+0x3cf/0xb50 [ 36.787131] ? register_framebuffer+0x9e0/0x9e0 [ 36.787138] ? avc_has_extended_perms+0xe4/0xea0 [ 36.787144] ? check_preemption_disabled+0x41/0x280 [ 36.787153] ? avc_has_extended_perms+0x86d/0xea0 [ 36.787160] ? __save_stack_trace+0xaf/0x190 [ 36.787168] ? avc_ss_reset+0x170/0x170 [ 36.787175] ? trace_hardirqs_off+0x64/0x200 [ 36.787181] ? __kasan_slab_free+0x186/0x1f0 [ 36.787188] ? kmem_cache_free+0x7f/0x260 [ 36.787194] ? putname+0xe1/0x120 [ 36.787204] ? debug_check_no_obj_freed+0x201/0x482 [ 36.787212] ? lock_downgrade+0x720/0x720 [ 36.787218] ? lock_acquire+0x170/0x3c0 [ 36.787225] fb_ioctl+0xdd/0x130 [ 36.787231] ? do_fb_ioctl+0xb50/0xb50 [ 36.787238] do_vfs_ioctl+0xcdb/0x12e0 [ 36.787246] ? selinux_file_ioctl+0x506/0x6c0 [ 36.787253] ? ioctl_preallocate+0x200/0x200 [ 36.787260] ? selinux_inode_link+0x20/0x20 [ 36.787267] ? putname+0xe1/0x120 [ 36.787274] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 36.787280] ? putname+0xe1/0x120 [ 36.787290] ksys_ioctl+0x9b/0xc0 [ 36.787298] __x64_sys_ioctl+0x6f/0xb0 [ 36.787305] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.787312] do_syscall_64+0xf9/0x620 [ 36.787320] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.787324] RIP: 0033:0x4403d9 [ 36.787331] 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 [ 36.787334] RSP: 002b:00007ffcb72f6508 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 36.787340] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403d9 [ 36.787344] RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000003 [ 36.787348] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 36.787351] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401be0 [ 36.787355] R13: 0000000000401c70 R14: 0000000000000000 R15: 0000000000000000 [ 36.788534] Kernel Offset: disabled [ 37.645705] Rebooting in 86400 seconds..