https://sourceware.org/bugzilla/show_bug.cgi?id=34867
Bug ID: 34867
Summary: GNU ld trusts an XCOFF64 relocation count before
validating the file extent
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 17186
--> https://sourceware.org/bugzilla/attachment.cgi?id=17186&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 118-byte XCOFF64 input with section[0].s_nreloc 0x10000001 makes GNU ld
request 0xe000000e bytes for external relocations and 0x80000008 bytes for its
csect cache before validating that the file contains those records; current and
2.46 reproduce under strict limits while a one-byte count=1 control avoids both
allocations.
Reproduction
============
1. Download and extract
`bfd-xcoff-relocation-count-prevalidation-memory-dos-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_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 118-byte XCOFF64 input with section[0].s_nreloc 0x10000001 makes GNU ld
request 0xe000000e bytes for external relocations and 0x80000008 bytes for its
csect cache before validating that the file contains those records; current and
2.46 reproduce under strict limits while a one-byte count=1 control avoids both
allocations.
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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