[$] The long road to a fix for CVE-2021-20316

Well-maintained free-software projects usually make a point of quicklyfixing known security problems, and the Sambaproject, which provides interoperability between Windows and Unixsystems, is no exception. So it is natural to wonder why the fix for CVE-2021-20316,a symbolic-link vulnerability, was well over two years in coming.Sometimes, a security bug can be fixed with a simple tweak to the code.Other times, the fix requires a massive rewrite of much of a projects'sinternal code. This particular vulnerability fell firmly into the lattercategory, necessitating a public rewrite of Samba's virtual filesystem(VFS) layer to address a non-disclosed vulnerability.