https://sourceware.org/bugzilla/show_bug.cgi?id=34827
Bug ID: 34827
Summary: GNU ld MSP430 branch expansion reads past the section
end
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 17147
--> https://sourceware.org/bugzilla/attachment.cgi?id=17147&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 --relax on the included MSP430 relocatable object, with
R_MSP430_10_PCREL at offset 0x803 in a 0x804-byte .text, reaches the
out-of-range branch expansion and performs a two-byte opcode load starting at
the final section byte at bfd/elf32-msp430.c:2167; the tested current ASan
build reproduces twice, GNU ld 2.46 Memcheck confirms the read, and the
offset-0x802 control is clean.
Reproduction
============
1. Download and extract
`bfd-msp430-relax-expansion-end-oob-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
===============
GNU ld --relax on the included MSP430 relocatable object, with
R_MSP430_10_PCREL at offset 0x803 in a 0x804-byte .text, reaches the
out-of-range branch expansion and performs a two-byte opcode load starting at
the final section byte at bfd/elf32-msp430.c:2167; the tested current ASan
build reproduces twice, GNU ld 2.46 Memcheck confirms the read, and the
offset-0x802 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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