https://sourceware.org/bugzilla/show_bug.cgi?id=34807
Bug ID: 34807
Summary: GNU ld LoongArch mixed-backend NULL dereference
through an IRIX MIPS bad symbol table
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 17127
--> https://sourceware.org/bugzilla/attachment.cgi?id=17127&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
=======
A valid MIPS64 ET_REL object recognized through the IRIX-compatible MIPS vector
makes multi-target GNU ld diagnose a LoongArch architecture mismatch and then
dereference a NULL elf_link_hash_entry in RELOC_FOR_GLOBAL_SYMBOL; official
2.46 and current unsanitized builds SIGSEGV, while a one-byte RSS_UNDEF control
and traditional-vector route reject cleanly.
Reproduction
============
1. Download and extract
`bfd-loongarch-mixed-backend-bad-symtab-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
===============
A valid MIPS64 ET_REL object recognized through the IRIX-compatible MIPS vector
makes multi-target GNU ld diagnose a LoongArch architecture mismatch and then
dereference a NULL elf_link_hash_entry in RELOC_FOR_GLOBAL_SYMBOL; official
2.46 and current unsanitized builds SIGSEGV, while a one-byte RSS_UNDEF control
and traditional-vector route reject cleanly.
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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