https://sourceware.org/bugzilla/show_bug.cgi?id=34850
Bug ID: 34850
Summary: GNU ld RX relaxation reads past a missing companion
relocation
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 17170
--> https://sourceware.org/bugzilla/attachment.cgi?id=17170&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
=======
An RX relaxation operand expression missing its final R_RX_ABS16UL relocation
makes rx_offset_for_reloc read beyond a four-entry relocation array;
current-head ASan and released GNU ld 2.46 and 2.47 under Memcheck reproduce
the over-read, while the complete five-entry control is clean.
Reproduction
============
1. Download and extract
`bfd-rx-relax-missing-companion-relocation-read-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=/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
===============
An RX relaxation operand expression missing its final R_RX_ABS16UL relocation
makes rx_offset_for_reloc read beyond a four-entry relocation array;
current-head ASan and released GNU ld 2.46 and 2.47 under Memcheck reproduce
the over-read, while the complete five-entry control is clean.
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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