BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:426 [inline] BUG: KASAN: slab-out-of-bounds in soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70 Read of size 64 at addr ffff88809699d950 by task syz-executor330/9522 CPU: 0 PID: 9522 Comm: syz-executor330 Not tainted 5.6.0-rc3-next-20200228-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.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:618 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 memcpy+0x20/0x50 mm/kasan/common.c:104 memcpy include/linux/string.h:426 [inline] soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70 bit_cursor+0x1230/0x1900 drivers/video/fbdev/core/bitblit.c:386 fbcon_cursor+0x477/0x650 drivers/video/fbdev/core/fbcon.c:1408 hide_cursor+0x85/0x280 drivers/tty/vt/vt.c:896 redraw_screen+0x5db/0x770 drivers/tty/vt/vt.c:1000 vc_do_resize+0xfe6/0x1340 drivers/tty/vt/vt.c:1296 vt_ioctl+0x1e8e/0x2450 drivers/tty/vt/vt_ioctl.c:906 tty_ioctl+0xedd/0x1440 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440269 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffc6b5a138 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 RDX: 0000000020000080 RSI: 000000000000560a RDI: 0000000000000004 RBP: 00000000006cb018 R08: 0000000000000001 R09: 00000000004002c8 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000401b50 R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9522: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:492 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:465 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x161/0x7a0 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2669 con_font_set drivers/tty/vt/vt.c:4550 [inline] con_font_op+0xd5d/0x1160 drivers/tty/vt/vt.c:4615 vt_ioctl+0x168c/0x2450 drivers/tty/vt/vt_ioctl.c:985 tty_ioctl+0xedd/0x1440 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9266: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:314 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:453 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 tomoyo_init_log+0x1479/0x1e50 security/tomoyo/audit.c:293 tomoyo_supervisor+0x2dd/0xe60 security/tomoyo/common.c:2097 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x17f/0x1f0 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:674 [inline] tomoyo_find_next_domain+0x1354/0x1f6c security/tomoyo/domain.c:881 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:107 [inline] tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:97 security_bprm_check+0x5c/0xb0 security/security.c:816 search_binary_handler+0x70/0x580 fs/exec.c:1675 exec_binprm fs/exec.c:1731 [inline] __do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851 do_execveat_common fs/exec.c:1897 [inline] do_execve fs/exec.c:1914 [inline] __do_sys_execve fs/exec.c:1990 [inline] __se_sys_execve fs/exec.c:1985 [inline] __x64_sys_execve+0x8a/0xb0 fs/exec.c:1985 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809699c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6480 bytes inside of 8192-byte region [ffff88809699c000, ffff88809699e000) The buggy address belongs to the page: page:ffffea00025a6700 refcount:1 mapcount:0 mapping:0000000032ac96ad index:0x0 head:ffffea00025a6700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00025a8f08 ffffea0002a20408 ffff8880aa0021c0 raw: 0000000000000000 ffff88809699c000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809699d800: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809699d880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809699d900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809699d980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809699da00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================