[Bug dynamic-link/24974] New: Support preloading new symbol versions

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24974

            Bug ID: 24974
           Summary: Support preloading new symbol versions
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

It should be possible to LD_PRELOAD completely new symbol versions for another
DSO.  This should be controlled by a new LD_* environment variable.  By
default, such errors should still be fatal.

If the referencing object is linked with BIND_NOW, we could drop the coverage
check by default.  In this case, if the versioned symbol is not provided by
some other means, binding the symbol will fail, and the version coverage check
is therefore redundant.  On the other hand, adding yet another special case to
BIND_NOW might be too confusing.

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