[Bug dynamic-link/18685] New: Avoid mapping past end of shared object

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18685

            Bug ID: 18685
           Summary: Avoid mapping past end of shared object
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: siddhesh at redhat dot com
  Target Milestone: ---

Some valid ELF objects, like .debug files may refer to sections outside
themselves since they're loaded and patched up to their parent ELF.  Calling
ldd on them may result in a segfault since it may try to read beyond the end of
the mapping.  Red Hat bz:

https://bugzilla.redhat.com/show_bug.cgi?id=741105

has an example, although I haven't been able to find a sample reproducer file
immediately.  This patch has been carried in Fedora and RHEL for a couple of
years now.

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