netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:33 instrument_copy_to_user include/linux/instrumented.h:121 [inline] _copy_to_user+0xbc/0x100 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:169 [inline] vcs_read+0x1ef7/0x23c0 drivers/tty/vt/vc_screen.c:456 vfs_read+0x3a9/0x11b0 fs/read_write.c:480 ksys_read+0x21b/0x4e0 fs/read_write.c:620 __do_sys_read fs/read_write.c:630 [inline] __se_sys_read fs/read_write.c:628 [inline] __x64_sys_read+0x8f/0xd0 fs/read_write.c:628 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was stored to memory at: vc_uniscr_copy_line+0x340/0x570 drivers/tty/vt/vt.c:565 vcs_read_buf_uni drivers/tty/vt/vc_screen.c:265 [inline] vcs_read+0x102d/0x23c0 drivers/tty/vt/vc_screen.c:436 vfs_read+0x3a9/0x11b0 fs/read_write.c:480 ksys_read+0x21b/0x4e0 fs/read_write.c:620 __do_sys_read fs/read_write.c:630 [inline] __se_sys_read fs/read_write.c:628 [inline] __x64_sys_read+0x8f/0xd0 fs/read_write.c:628 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was created at: __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5471 __alloc_pages_bulk+0x1de1/0x24b0 mm/page_alloc.c:5396 alloc_pages_bulk_array_mempolicy+0xc2f/0xf40 mm/mempolicy.c:2367 vm_area_alloc_pages mm/vmalloc.c:2915 [inline] __vmalloc_area_node mm/vmalloc.c:3011 [inline] __vmalloc_node_range+0xad6/0x2700 mm/vmalloc.c:3181 __vmalloc_node mm/vmalloc.c:3246 [inline] vmalloc+0x8c/0xa0 mm/vmalloc.c:3279 vc_uniscr_alloc drivers/tty/vt/vt.c:347 [inline] vc_do_resize+0x6d4/0x2ba0 drivers/tty/vt/vt.c:1249 vc_resize+0x5a/0x70 drivers/tty/vt/vt.c:1362 fbcon_modechanged+0xb81/0x15a0 drivers/video/fbdev/core/fbcon.c:2679 fbcon_update_vcs+0x36/0x40 drivers/video/fbdev/core/fbcon.c:2735 do_fb_ioctl+0xb7f/0xc50 drivers/video/fbdev/core/fbmem.c:1124 fb_ioctl+0x168/0x1a0 drivers/video/fbdev/core/fbmem.c:1201 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x92/0xd0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Bytes 0-15 of 48 are uninitialized Memory access of size 48 starts at ffff888011bb5000 Data copied to user address 0000000020002040 CPU: 0 PID: 14575 Comm: syz-executor.1 Not tainted 5.19.0-syzkaller-32655-g1b070a5d1a2c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 =====================================================