https://sourceware.org/bugzilla/show_bug.cgi?id=34812
Bug ID: 34812
Summary: GNU ld MIPS dereferences a NULL per-BFD GOT after GOT
preallocation is skipped
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 17132
--> https://sourceware.org/bugzilla/attachment.cgi?id=17132&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
=======
MIPS final relocation continues with a NULL per-BFD GOT after either a
diagnosed N32/O32 ABI mismatch or skipped preallocation for a non-ALLOC
relocation target; TLS and CALL_LO16 variants dereference g->got_entries at
elfxx-mips.c:3914 and 3926 in current and released GNU ld, while correct-ABI
and exact SHF_ALLOC controls pass and LLD does not process-fail.
Reproduction
============
1. Download and extract
`bfd-mips-abi-mismatch-missing-got-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
===============
MIPS final relocation continues with a NULL per-BFD GOT after either a
diagnosed N32/O32 ABI mismatch or skipped preallocation for a non-ALLOC
relocation target; TLS and CALL_LO16 variants dereference g->got_entries at
elfxx-mips.c:3914 and 3926 in current and released GNU ld, while correct-ABI
and exact SHF_ALLOC controls pass and LLD does not process-fail.
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.
--
You are receiving this mail because:
You are on the CC list for the bug.
