https://sourceware.org/bugzilla/show_bug.cgi?id=34835
Bug ID: 34835
Summary: GNU ld PPC64 dereferences a NULL symbol-hash array for
an empty 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 17155
--> https://sourceware.org/bugzilla/attachment.cgi?id=17155&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 ELF64 PPC64 relocation against symbol zero with sh_info zero and a
zero-sized symbol table makes ppc64_elf_check_relocs index a NULL sym_hashes
array at elf64-ppc.c:4819; current ASan/UBSan attributes a zero-page read,
unsanitized current and released GNU ld 2.46 SIGSEGV in final-link modes, a
one-byte populated malformed control is rejected cleanly, and a valid control
links.
Reproduction
============
1. Download and extract
`bfd-ppc64-empty-symtab-null-hash-array-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
===============
An ELF64 PPC64 relocation against symbol zero with sh_info zero and a
zero-sized symbol table makes ppc64_elf_check_relocs index a NULL sym_hashes
array at elf64-ppc.c:4819; current ASan/UBSan attributes a zero-page read,
unsanitized current and released GNU ld 2.46 SIGSEGV in final-link modes, a
one-byte populated malformed control is rejected cleanly, and a valid control
links.
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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