[ 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 '10.128.10.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 203.747252] audit: type=1400 audit(1599560102.868:8): avc: denied { execmem } for pid=6471 comm="syz-executor148" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 270.849754] ================================================================== [ 270.849824] BUG: KASAN: slab-out-of-bounds in cfb_imageblit+0xe76/0x1040 [ 270.849831] Read of size 1 at addr ffff8882197560c0 by task syz-executor148/9887 [ 270.849833] [ 270.849844] CPU: 1 PID: 9887 Comm: syz-executor148 Not tainted 4.19.143-syzkaller #0 [ 270.849848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 270.849851] Call Trace: [ 270.849882] dump_stack+0x1fc/0x2fe [ 270.849895] print_address_description.cold+0x54/0x219 [ 270.849904] kasan_report_error.cold+0x8a/0x1c7 [ 270.849911] ? cfb_imageblit+0xe76/0x1040 [ 270.849917] __asan_report_load1_noabort+0x88/0x90 [ 270.849925] ? cfb_imageblit+0xe76/0x1040 [ 270.849932] cfb_imageblit+0xe76/0x1040 [ 270.849946] vga16fb_imageblit+0x6b4/0x2260 [ 270.849957] ? __lock_acquire+0x6de/0x3ff0 [ 270.849987] ? fb_get_buffer_offset+0x17e/0x330 [ 270.849995] bit_putcs+0x6e2/0xd10 [ 270.850010] ? bit_cursor+0x1820/0x1820 [ 270.850021] ? fb_get_color_depth+0x11a/0x240 [ 270.850029] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 270.850038] ? bit_cursor+0x1820/0x1820 [ 270.850045] fbcon_putcs+0x336/0x4f0 [ 270.850053] ? fb_flashcursor+0x440/0x440 [ 270.850070] do_con_write+0xbcd/0x1d90 [ 270.850086] ? do_con_trol+0x5970/0x5970 [ 270.850126] ? wait_for_completion_io+0x10/0x10 [ 270.850136] con_write+0x22/0xb0 [ 270.850163] n_tty_write+0x3c0/0xff0 [ 270.850181] ? n_tty_open+0x160/0x160 [ 270.850188] ? lock_acquire+0x170/0x3c0 [ 270.850195] ? do_wait_intr_irq+0x270/0x270 [ 270.850203] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 270.850210] ? __phys_addr+0x9a/0x110 [ 270.850219] ? __might_fault+0x50/0x1d0 [ 270.850228] tty_write+0x496/0x810 [ 270.850234] ? n_tty_open+0x160/0x160 [ 270.850246] __vfs_write+0xf7/0x770 [ 270.850253] ? tty_compat_ioctl+0x270/0x270 [ 270.850259] ? __put_page+0xcc/0x3a0 [ 270.850267] ? kernel_read+0x110/0x110 [ 270.850288] ? iov_iter_advance+0x7cc/0xd80 [ 270.850302] ? default_file_splice_read+0x814/0xa00 [ 270.850314] __kernel_write+0x109/0x370 [ 270.850323] write_pipe_buf+0x153/0x1f0 [ 270.850330] ? mark_held_locks+0xf0/0xf0 [ 270.850338] ? default_file_splice_read+0xa00/0xa00 [ 270.850346] ? splice_from_pipe_next.part.0+0x2ad/0x360 [ 270.850356] __splice_from_pipe+0x389/0x800 [ 270.850365] ? default_file_splice_read+0xa00/0xa00 [ 270.850375] default_file_splice_write+0xd8/0x180 [ 270.850383] ? generic_splice_sendpage+0x140/0x140 [ 270.850436] ? security_file_permission+0x1c0/0x220 [ 270.850446] ? generic_splice_sendpage+0x140/0x140 [ 270.850454] direct_splice_actor+0x115/0x160 [ 270.850463] splice_direct_to_actor+0x33f/0x8d0 [ 270.850473] ? generic_pipe_buf_nosteal+0x10/0x10 [ 270.850482] ? do_splice_to+0x160/0x160 [ 270.850494] do_splice_direct+0x1a7/0x270 [ 270.850506] ? splice_direct_to_actor+0x8d0/0x8d0 [ 270.850521] ? security_file_permission+0x1c0/0x220 [ 270.850540] do_sendfile+0x550/0xc30 [ 270.850560] ? do_compat_pwritev64+0x1b0/0x1b0 [ 270.850578] ? __se_sys_futex+0x28f/0x3b0 [ 270.850588] ? __se_sys_futex+0x298/0x3b0 [ 270.850598] __se_sys_sendfile64+0x147/0x160 [ 270.850606] ? __se_sys_sendfile+0x180/0x180 [ 270.850616] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 270.850624] ? trace_hardirqs_off_caller+0x69/0x210 [ 270.850632] ? do_syscall_64+0x21/0x620 [ 270.850641] do_syscall_64+0xf9/0x620 [ 270.850650] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 270.850657] RIP: 0033:0x446ad9 [ 270.850665] Code: e8 9c b4 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 8b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 270.850669] RSP: 002b:00007f123f15ad18 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 270.850676] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446ad9 [ 270.850681] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 [ 270.850685] RBP: 00000000006dbc50 R08: 65732f636f72702f R09: 65732f636f72702f [ 270.850689] R10: 0800000080004103 R11: 0000000000000246 R12: 00000000006dbc5c [ 270.850694] R13: 00007f123f15ad20 R14: 00007f123f15ad20 R15: 20c49ba5e353f7cf [ 270.850703] [ 270.850707] Allocated by task 1: [ 270.850716] kmem_cache_alloc_trace+0x12f/0x380 [ 270.850723] register_framebuffer+0x73d/0x9e0 [ 270.850729] vga16fb_probe+0x6b4/0x7b7 [ 270.850790] platform_drv_probe+0x8d/0x160 [ 270.850796] really_probe+0x58c/0x7e0 [ 270.850803] driver_probe_device+0xf9/0x200 [ 270.850809] __device_attach_driver+0x28b/0x310 [ 270.850815] bus_for_each_drv+0x159/0x1e0 [ 270.850821] __device_attach+0x226/0x440 [ 270.850827] bus_probe_device+0x1ea/0x2a0 [ 270.850832] device_add+0xac3/0x1610 [ 270.850838] platform_device_add+0x355/0x6e0 [ 270.850846] vga16fb_init+0x152/0x1c8 [ 270.850852] do_one_initcall+0xf1/0x734 [ 270.850865] kernel_init_freeable+0x9ab/0xa9d [ 270.850872] kernel_init+0xd/0x1bd [ 270.850878] ret_from_fork+0x24/0x30 [ 270.850880] [ 270.850883] Freed by task 0: [ 270.850885] (stack is not available) [ 270.850887] [ 270.850892] The buggy address belongs to the object at ffff8882197540c0 [ 270.850892] which belongs to the cache kmalloc-8192 of size 8192 [ 270.850898] The buggy address is located 0 bytes to the right of [ 270.850898] 8192-byte region [ffff8882197540c0, ffff8882197560c0) [ 270.850901] The buggy address belongs to the page: [ 270.850908] page:ffffea000865d500 count:1 mapcount:0 mapping:ffff88812c395080 index:0x0 compound_mapcount: 0 [ 270.850916] flags: 0x57ffe0000008100(slab|head) [ 270.850925] raw: 057ffe0000008100 ffffea0008697908 ffffea0008629d08 ffff88812c395080 [ 270.850933] raw: 0000000000000000 ffff8882197540c0 0000000100000001 0000000000000000 [ 270.850936] page dumped because: kasan: bad access detected [ 270.850938] [ 270.850940] Memory state around the buggy address: [ 270.850946] ffff888219755f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 270.850951] ffff888219756000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 270.850957] >ffff888219756080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 270.850959] ^ [ 270.850964] ffff888219756100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 270.850969] ffff888219756180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 270.850972] ================================================================== [ 270.850974] Disabling lock debugging due to kernel taint [ 270.850978] Kernel panic - not syncing: panic_on_warn set ... [ 270.850978] [ 270.850986] CPU: 1 PID: 9887 Comm: syz-executor148 Tainted: G B 4.19.143-syzkaller #0 [ 270.850990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 270.850991] Call Trace: [ 270.850998] dump_stack+0x1fc/0x2fe [ 270.851006] panic+0x26a/0x50e [ 270.851012] ? __warn_printk+0xf3/0xf3 [ 270.851020] ? lock_downgrade+0x720/0x720 [ 270.851027] ? print_shadow_for_address+0xb8/0x114 [ 270.851033] ? trace_hardirqs_on+0x55/0x210 [ 270.851040] kasan_end_report+0x43/0x49 [ 270.851047] kasan_report_error.cold+0xa7/0x1c7 [ 270.851053] ? cfb_imageblit+0xe76/0x1040 [ 270.851059] __asan_report_load1_noabort+0x88/0x90 [ 270.851065] ? cfb_imageblit+0xe76/0x1040 [ 270.851072] cfb_imageblit+0xe76/0x1040 [ 270.851082] vga16fb_imageblit+0x6b4/0x2260 [ 270.851090] ? __lock_acquire+0x6de/0x3ff0 [ 270.851096] ? fb_get_buffer_offset+0x17e/0x330 [ 270.851103] bit_putcs+0x6e2/0xd10 [ 270.851113] ? bit_cursor+0x1820/0x1820 [ 270.851121] ? fb_get_color_depth+0x11a/0x240 [ 270.851128] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 270.851134] ? bit_cursor+0x1820/0x1820 [ 270.851141] fbcon_putcs+0x336/0x4f0 [ 270.851148] ? fb_flashcursor+0x440/0x440 [ 270.851155] do_con_write+0xbcd/0x1d90 [ 270.851166] ? do_con_trol+0x5970/0x5970 [ 270.851174] ? wait_for_completion_io+0x10/0x10 [ 270.851181] con_write+0x22/0xb0 [ 270.851188] n_tty_write+0x3c0/0xff0 [ 270.851197] ? n_tty_open+0x160/0x160 [ 270.851204] ? lock_acquire+0x170/0x3c0 [ 270.851210] ? do_wait_intr_irq+0x270/0x270 [ 270.851216] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 270.851222] ? __phys_addr+0x9a/0x110 [ 270.851228] ? __might_fault+0x50/0x1d0 [ 270.851235] tty_write+0x496/0x810 [ 270.851241] ? n_tty_open+0x160/0x160 [ 270.851250] __vfs_write+0xf7/0x770 [ 270.851255] ? tty_compat_ioctl+0x270/0x270 [ 270.851261] ? __put_page+0xcc/0x3a0 [ 270.851267] ? kernel_read+0x110/0x110 [ 270.851274] ? iov_iter_advance+0x7cc/0xd80 [ 270.851283] ? default_file_splice_read+0x814/0xa00 [ 270.851292] __kernel_write+0x109/0x370 [ 270.851299] write_pipe_buf+0x153/0x1f0 [ 270.851306] ? mark_held_locks+0xf0/0xf0 [ 270.851313] ? default_file_splice_read+0xa00/0xa00 [ 270.851319] ? splice_from_pipe_next.part.0+0x2ad/0x360 [ 270.851327] __splice_from_pipe+0x389/0x800 [ 270.851335] ? default_file_splice_read+0xa00/0xa00 [ 270.851343] default_file_splice_write+0xd8/0x180 [ 270.851350] ? generic_splice_sendpage+0x140/0x140 [ 270.851358] ? security_file_permission+0x1c0/0x220 [ 270.851366] ? generic_splice_sendpage+0x140/0x140 [ 270.851373] direct_splice_actor+0x115/0x160 [ 270.851380] splice_direct_to_actor+0x33f/0x8d0 [ 270.851388] ? generic_pipe_buf_nosteal+0x10/0x10 [ 270.851395] ? do_splice_to+0x160/0x160 [ 270.851404] do_splice_direct+0x1a7/0x270 [ 270.851411] ? splice_direct_to_actor+0x8d0/0x8d0 [ 270.851419] ? security_file_permission+0x1c0/0x220 [ 270.851427] do_sendfile+0x550/0xc30 [ 270.851437] ? do_compat_pwritev64+0x1b0/0x1b0 [ 270.851444] ? __se_sys_futex+0x28f/0x3b0 [ 270.851450] ? __se_sys_futex+0x298/0x3b0 [ 270.851458] __se_sys_sendfile64+0x147/0x160 [ 270.851465] ? __se_sys_sendfile+0x180/0x180 [ 270.851472] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 270.851478] ? trace_hardirqs_off_caller+0x69/0x210 [ 270.851485] ? do_syscall_64+0x21/0x620 [ 270.851492] do_syscall_64+0xf9/0x620 [ 270.851500] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 270.851505] RIP: 0033:0x446ad9 [ 270.851511] Code: e8 9c b4 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 8b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 270.851514] RSP: 002b:00007f123f15ad18 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 270.851520] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446ad9 [ 270.851524] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 [ 270.851528] RBP: 00000000006dbc50 R08: 65732f636f72702f R09: 65732f636f72702f [ 270.851532] R10: 0800000080004103 R11: 0000000000000246 R12: 00000000006dbc5c [ 270.851536] R13: 00007f123f15ad20 R14: 00007f123f15ad20 R15: 20c49ba5e353f7cf [ 270.852719] Kernel Offset: disabled [ 271.849428] Rebooting in 86400 seconds..