https://sourceware.org/bugzilla/show_bug.cgi?id=34839
Bug ID: 34839
Summary: GNU ld PPC64 stub grouping reads past foreign input
section data
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 17159
--> https://sourceware.org/bugzilla/attachment.cgi?id=17159&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 all-target GNU ld forced to emit PPC64 diagnoses a valid x86-64 relocatable
as incompatible, then PPC64 stub grouping reads the has_14bit_branch bit
through an unchecked cast of the foreign section data; current ASan reports a
one-byte heap OOB read, while a one-field PPC64 control and matching x86 route
pass.
Reproduction
============
1. Download and extract
`bfd-ppc64-stub-group-mixed-backend-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:
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 all-target GNU ld forced to emit PPC64 diagnoses a valid x86-64 relocatable
as incompatible, then PPC64 stub grouping reads the has_14bit_branch bit
through an unchecked cast of the foreign section data; current ASan reports a
one-byte heap OOB read, while a one-field PPC64 control and matching x86 route
pass.
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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