https://sourceware.org/bugzilla/show_bug.cgi?id=34852
Bug ID: 34852
Summary: GNU ld s390 local IFUNC in an empty relocated section
dereferences NULL
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 17172
--> https://sourceware.org/bugzilla/attachment.cgi?id=17172&action=edit
repro
I'm reporting this bug on behalf of my team: Ananta Srikar Puranam, Emily West,
Dr. Swarn Priya, Dr. Peng Gao and Dr. Basavesh Ammanaghatta Shivakumar.
Summary
=======
GNU ld's ELF64 s390 backend allocates a local IFUNC IPLT entry for a relocation
targeting an empty section but never records its section pointer, then
dereferences NULL in elf_s390_finish_dynamic_sections; a one-byte size control
passes and current plus GNU ld 2.46 reproduce.
Reproduction
============
1. Download and extract
`bfd-s390-local-ifunc-empty-section-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 allocates a local IFUNC IPLT entry for a relocation
targeting an empty section but never records its section pointer, then
dereferences NULL in elf_s390_finish_dynamic_sections; a one-byte size control
passes and current 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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