[Bug ld/20995] New: Read-only data in ELF libraries may be remapped writable at runtime

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20995

            Bug ID: 20995
           Summary: Read-only data in ELF libraries may be remapped
                    writable at runtime
           Product: binutils
           Version: 2.28 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: amodra at gmail dot com
  Target Milestone: ---

Variables defined in shared libraries are copied into an executable's .bss
section when code in the executable is non-PIC and thus would require dynamic
text relocations to access the variable directly in the shared library.  Recent
x86 toolchains also copy variables into the executable to gain a small speed
improvement.

The problem is that if the variable was originally read-only, the copy in .bss
is writable, potentially opening a security hole.

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