================================================================== BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:376 [inline] BUG: KASAN: global-out-of-bounds in soft_cursor+0x442/0xa50 drivers/video/fbdev/core/softcursor.c:70 Read of size 31 at addr ffffffff87cf6952 by task syz-executor.5/21448 CPU: 0 PID: 21448 Comm: syz-executor.5 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x5/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report+0x6f/0x80 mm/kasan/report.c:409 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:376 [inline] soft_cursor+0x442/0xa50 drivers/video/fbdev/core/softcursor.c:70 bit_cursor+0xf7a/0x1580 drivers/video/fbdev/core/bitblit.c:377 fbcon_cursor+0x48e/0x650 drivers/video/fbdev/core/fbcon.c:1290 fbcon_scroll+0x2b7/0x31e0 drivers/video/fbdev/core/fbcon.c:1647 con_scroll+0x2c5/0x360 drivers/tty/vt/vt.c:327 lf+0x226/0x270 drivers/tty/vt/vt.c:1141 do_con_write+0xf9b/0x19b0 drivers/tty/vt/vt.c:2414 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x352/0xda0 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x410/0x740 drivers/tty/tty_io.c:1043 __vfs_write+0xe4/0x630 fs/read_write.c:480 __kernel_write+0xf5/0x330 fs/read_write.c:501 write_pipe_buf+0x143/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x326/0x7a0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] default_file_splice_write+0xc5/0x150 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1018 splice_direct_to_actor+0x27c/0x730 fs/splice.c:973 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1496 [inline] SyS_sendfile64+0x9b/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4665f9 RSP: 002b:00007f1acae90188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000020000040 RSI: 0000000000000006 RDI: 0000000000000007 RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008001 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffec823d9cf R14: 00007f1acae90300 R15: 0000000000022000 The buggy address belongs to the variable: str__msr__trace_system_name+0xf2/0xb00 Memory state around the buggy address: ffffffff87cf6800: fa fa fa fa 00 03 fa fa fa fa fa fa 04 fa fa fa ffffffff87cf6880: fa fa fa fa 00 03 fa fa fa fa fa fa 05 fa fa fa >ffffffff87cf6900: fa fa fa fa 00 06 fa fa fa fa fa fa 00 00 00 03 ^ ffffffff87cf6980: fa fa fa fa 00 02 fa fa fa fa fa fa 00 00 07 fa ffffffff87cf6a00: fa fa fa fa 00 00 07 fa fa fa fa fa 00 00 01 fa ==================================================================