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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