https://sourceware.org/bugzilla/show_bug.cgi?id=34858
Bug ID: 34858
Summary: GNU ld SH load-alignment helper walks past section
contents
Product: binutils
Version: 2.47
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 17178
--> https://sourceware.org/bugzilla/attachment.cgi?id=17178&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 SH ELF object, whose R_SH_DATA span marker is
0x1044 while .text is 0x54 bytes, passes an out-of-section stop to
_bfd_sh_align_load_span and performs a two-byte instruction load beyond the
allocation; current ASan attributes the access to bfd/coff-sh.c:2403 while the
included patched source has the literal bfd_get_16 expression at line 2405, GNU
ld 2.46 Memcheck confirms repeated invalid reads, and the canonical in-section
span control is clean.
Reproduction
============
1. Download and extract `bfd-sh-align-load-span-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 SH ELF object, whose R_SH_DATA span marker is
0x1044 while .text is 0x54 bytes, passes an out-of-section stop to
_bfd_sh_align_load_span and performs a two-byte instruction load beyond the
allocation; current ASan attributes the access to bfd/coff-sh.c:2403 while the
included patched source has the literal bfd_get_16 expression at line 2405, GNU
ld 2.46 Memcheck confirms repeated invalid reads, and the canonical in-section
span 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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