Editing Rebasing (section)

=={{anchor|DCSS}}Shared libraries==
Rebasing is the process of creating a [[shared library]] image in such a way that it is guaranteed to use [[virtual memory]] without conflicting with any other [[Library (computer science)|shared libraries]] loadable in the system. 

IBM [[VM (operating system)|VM/370]] ''discontinuous saved segments'' (DCSS) were an early example of this technique, though not called ''rebasing''.  The technique is used extensively on [[Win32]] platforms to avoid the overhead of address relocation of system [[Dynamic-link library|DLL]]s by the loader. 

Some security extensions to [[Linux]]/[[X86 architecture|x86]] use rebasing to force the use of code addresses below <code>0x00ffffff</code> in order to introduce a <code>0x00</code> byte into all code pointers;{{cn|reason=I'm not disputing this, but I think a couple of sources discussing this in better details would be interesting here for some readers|date=July 2022}} This eliminates a certain class of [[buffer overflow]] security problems related to improper checking of [[null-terminated string]]s, common in the [[C (programming language)|C]] [[programming language]].