================================================================== BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:348 [inline] BUG: KASAN: global-out-of-bounds in fbcon_get_font+0x28d/0x5b0 drivers/video/fbdev/core/fbcon.c:2443 Read of size 32 at addr ffffffff87ad63e0 by task syz-executor.3/30191 CPU: 1 PID: 30191 Comm: syz-executor.3 Not tainted 4.19.111-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.cold+0x5/0x212 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:348 [inline] fbcon_get_font+0x28d/0x5b0 drivers/video/fbdev/core/fbcon.c:2443 con_font_get drivers/tty/vt/vt.c:4409 [inline] con_font_op+0x1f7/0x1130 drivers/tty/vt/vt.c:4568 vt_ioctl+0xc6c/0x2310 drivers/tty/vt/vt_ioctl.c:918 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff2f7a5ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff2f7a5b6d4 RCX: 000000000045c849 RDX: 0000000020000080 RSI: 0000000000004b60 RDI: 0000000000000004 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000036a R14: 00000000004c5db0 R15: 000000000076bf0c The buggy address belongs to the variable: fontdata_8x16+0x1000/0x1120 Memory state around the buggy address: ffffffff87ad6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff87ad6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffff87ad6380: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa ^ ffffffff87ad6400: 06 fa fa fa fa fa fa fa 05 fa fa fa fa fa fa fa ffffffff87ad6480: 06 fa fa fa fa fa fa fa 00 00 03 fa fa fa fa fa ==================================================================