================================================================== BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: slab-out-of-bounds in vc_do_resize+0xe2e/0x1d00 drivers/tty/vt/vt.c:1286 Read of size 4 at addr ffff8880a500faa0 by task syz-executor.0/7095 CPU: 1 PID: 7095 Comm: syz-executor.0 Not tainted 5.8.0-rc7-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+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:183 [inline] check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192 memcpy+0x25/0x60 mm/kasan/common.c:105 scr_memcpyw include/linux/vt_buffer.h:49 [inline] vc_do_resize+0xe2e/0x1d00 drivers/tty/vt/vt.c:1286 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl fs/ioctl.c:753 [inline] __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c369 Code: 8d 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f16624a4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000d540 RCX: 000000000045c369 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffd8d31687f R14: 00007f16624a59c0 R15: 000000000078bfac Allocated by task 3893: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x24b/0x330 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:669 [inline] tomoyo_encode2+0x25a/0x560 security/tomoyo/realpath.c:45 tomoyo_encode security/tomoyo/realpath.c:80 [inline] tomoyo_realpath_from_path+0x5d6/0x630 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x1b6/0x900 security/tomoyo/file.c:771 security_file_open+0x50/0xc0 security/security.c:1574 do_dentry_open+0x3cd/0x1070 fs/open.c:815 do_open fs/namei.c:3243 [inline] path_openat+0x278d/0x37f0 fs/namei.c:3360 do_filp_open+0x191/0x3a0 fs/namei.c:3387 do_sys_openat2+0x463/0x770 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_open fs/open.c:1201 [inline] __se_sys_open fs/open.c:1199 [inline] __x64_sys_open+0x1af/0x1e0 fs/open.c:1199 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 3893: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 tomoyo_check_open_permission+0x6e2/0x900 security/tomoyo/file.c:786 security_file_open+0x50/0xc0 security/security.c:1574 do_dentry_open+0x3cd/0x1070 fs/open.c:815 do_open fs/namei.c:3243 [inline] path_openat+0x278d/0x37f0 fs/namei.c:3360 do_filp_open+0x191/0x3a0 fs/namei.c:3387 do_sys_openat2+0x463/0x770 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_open fs/open.c:1201 [inline] __se_sys_open fs/open.c:1199 [inline] __x64_sys_open+0x1af/0x1e0 fs/open.c:1199 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880a500fa80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of 32-byte region [ffff8880a500fa80, ffff8880a500faa0) The buggy address belongs to the page: page:ffffea00029403c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a500ffc1 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029dfcc8 ffffea0002565fc8 ffff8880aa4001c0 raw: ffff8880a500ffc1 ffff8880a500f000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a500f980: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a500fa00: 00 04 fc fc fc fc fc fc fb fb fb fb fc fc fc fc >ffff8880a500fa80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880a500fb00: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc ffff8880a500fb80: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================