https://sourceware.org/bugzilla/show_bug.cgi?id=34862
Bug ID: 34862
Summary: GNU BFD writes COFF1 relocation bytes into TMS320C54x
COFF0 output
Product: binutils
Version: 2.47
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 17181
--> https://sourceware.org/bugzilla/attachment.cgi?id=17181&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 BFD serializes a twelve-byte COFF1 relocation through coff_swap_reloc_out
while writing a ten-byte TMS320C54x COFF0 record; released 2.46 and current
2.47.50.20261016 exit 0 but emit the same malformed object whose relocation
reserved field becomes 2 and type becomes 0, and both an independent reader and
BFD objdump reject it.
Reproduction
============
1. Download and extract
`bfd-tic54x-coff0-relocation-layout-overlap-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:
LD_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 BFD serializes a twelve-byte COFF1 relocation through coff_swap_reloc_out
while writing a ten-byte TMS320C54x COFF0 record; released 2.46 and current
2.47.50.20261016 exit 0 but emit the same malformed object whose relocation
reserved field becomes 2 and type becomes 0, and both an independent reader and
BFD objdump reject it.
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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