CVE-2023-53172 fsverity: reject FS_IOC_ENABLE_VERITY on mode 3 fds

In the Linux kernel, the following vulnerability has been resolved: fsverity: reject FSIOCENABLEVERITY on mode 3 fds Commit 56124d6c87fd "fsverity: support enabling with tree block size fmode & FMODEREAD' in kernelread became reachable by fuzz tests. This happens if FSIOCENABLEVERITY is called on...