usercopy: Kernel memory overwrite attempt detected to SLAB object 'names_cache' (offset 3036, size 4068)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:100!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4420 Comm: syz-executor5 Not tainted 4.16.0-rc6+ #287
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:usercopy_abort+0xae/0xd0 mm/usercopy.c:88
RSP: 0018:ffff88019c50f968 EFLAGS: 00010282
RAX: 0000000000000069 RBX: ffffffff880b966c RCX: 0000000000000000
RDX: 0000000000000069 RSI: 1ffff100338a1ee2 RDI: ffffed00338a1f21
RBP: ffff88019c50f9c0 R08: 0000000000000000 R09: 1ffff100338a1e89
R10: 0000000000000a76 R11: ffffffff88583118 R12: ffffffff87520540
R13: ffffffff875237e0 R14: 0000000000000bdc R15: 0000000000000fe4
FS:  00000000015e1940(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000015ea978 CR3: 000000019c407002 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __check_heap_object+0xb5/0xc0 mm/slab.c:4430
 check_heap_object mm/usercopy.c:236 [inline]
 __check_object_size+0x272/0x530 mm/usercopy.c:259
 check_object_size include/linux/thread_info.h:112 [inline]
 strncpy_from_user+0xf4/0x430 lib/strncpy_from_user.c:116
 getname_flags+0x10e/0x580 fs/namei.c:149
 user_path_at_empty+0x2d/0x50 fs/namei.c:2569
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xe9/0x190 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3080 [inline]
 SYSC_newlstat+0x87/0xf0 fs/stat.c:350
 SyS_newlstat+0x1d/0x30 fs/stat.c:344
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454255
netlink: 28 bytes leftover after parsing attributes in process `syz-executor3'.
RSP: 002b:0000000000a3d9d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 00000000000004fe RCX: 0000000000454255
RDX: 0000000000a3d9f0 RSI: 0000000000a3d9f0 RDI: 0000000000a3da80
RBP: 0000000000a3f790 R08: 0000000000000000 R09: 0000000000000011
R10: 000000000000000a R11: 0000000000000246 R12: 00000000015e2940
R13: 0000000000000000 R14: 0000000000000e53 R15: 0000000000089282
Code: e8 f8 32 c1 ff 48 8b 45 c0 4c 8b 45 c8 4d 89 e9 48 8b 55 d0 41 57 48 89 d9 41 56 4c 89 e6 48 c7 c7 e0 06 52 87 50 e8 1a d9 aa ff <0f> 0b 49 c7 c5 80 04 52 87 4c 89 e8 4d 89 e8 e9 76 ff ff ff 0f 
RIP: usercopy_abort+0xae/0xd0 mm/usercopy.c:88 RSP: ffff88019c50f968
---[ end trace 8e9f1c11641703a7 ]---