https://sourceware.org/bugzilla/show_bug.cgi?id=34854
Bug ID: 34854
Summary: GNU ld s390 static PLTOFF relocations dereference an
absent GOT
Product: binutils
Version: 2.46
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: basavesh.shivakumar at wsu dot edu
Target Milestone: ---
Created attachment 17174
--> https://sourceware.org/bugzilla/attachment.cgi?id=17174&action=edit
repro
Summary
=======
GNU ld's ELF64 s390 backend dereferences a NULL _GLOBAL_OFFSET_TABLE_ hash
entry for valid PLTOFF16/32/64 relocations in static final links; one-byte
controls link cleanly and current sanitizer plus GNU ld 2.46 reproduce.
Reproduction
============
1. Download and extract
`bfd-s390-pltoff-static-missing-got-null-dereference-reproducer.tar.gz`.
2. Run the following command with an ld.bfd or all-target `ld-new` binary that
supports the emulation used by the reproducer:
BFD=/path/to/ld-new sh repro.sh
The archive contains the fixed input files, independent controls, helper
scripts needed by `repro.sh`, and their checksums. The script uses a temporary
directory and does not modify the source tree.
Observed result
===============
GNU ld's ELF64 s390 backend dereferences a NULL _GLOBAL_OFFSET_TABLE_ hash
entry for valid PLTOFF16/32/64 relocations in static final links; one-byte
controls link cleanly and current sanitizer plus GNU ld 2.46 reproduce.
Expected result
===============
GNU ld should either produce the correct output or reject the input with a
normal diagnostic. It should not crash, hang, execute undefined behavior, read
outside an input-derived allocation, or produce the described malformed
output.
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