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[lld][Webassembly] Avoid a signed overflow on large sections (#178287 )

wasm sections sizes are specified as u32s, and thus can be as large as
4GB. wasm-ld currently stores the offset into a section as an int32_t
which overflows on large sections and results in a crash. This change
makes it a int64_t to accommodate any valid wasm section and allow
catching even larger sections instead of wrapping around.

This PR fixes the issue by storing the offset as a int64_t, as well as
adding extra checks to handle un-encodeable sections to fail instead of
producing garbage wasm binaries, and also adds lit tests to make sure it
works. I confirmed the test fails on `main` but passes with this fix.

Fixes: #178286

2026-02-10 12:04:05 -08:00

Inputs

[lld][WebAssembly] Improve import mismatch error reporting (#178715 )

2026-02-06 13:09:02 -08:00

lto

[lld][WebAssembly] Don't export deps for unused stub symbols (#173422 )

2025-12-23 16:58:06 -08:00

alias.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

allow-multiple-definition.s

[lld][WebAssembly] Add allow-multiple-definition flag (#97699 )

2024-09-04 08:50:10 -07:00

archive-export.test

[lld][WebAssembly] Fix visibility of __stack_pointer global (#161284 )

2025-09-29 15:45:48 -07:00

archive-local-sym.s

[lld][WebAssembly] Ignore local symbols when parsing lazy object files. (#104876 )

2024-08-19 21:51:40 -07:00

archive-weak-undefined.s

…

archive.ll

…

bad-archive-member.s

[lld][WebAssembly] Match the ELF linker in transitioning away from archive indexes. (#78658 )

2024-01-19 16:20:29 -08:00

bad-data-relocs.s

[lld][WebAssembly] Error on unexpected relocation types in -pie/-shared data sections (#162117 )

2025-10-06 16:30:40 -07:00

bss-only.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

bsymbolic.s

…

build-id.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

call-indirect.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

check-arch-32-in-64.test

…

check-arch-64-in-32.test

…

comdat-sections.s

…

comdats.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

command-exports-no-tors.s

…

command-exports.s

…

compact-imports.s

[WebAssembly] Add initial support for compact imports proposal (#176617 )

2026-02-10 10:57:45 -08:00

compress-relocs64.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

compress-relocs.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

conflict.test

…

corrupted.wasm.test

…

ctor-gc-setup.test

…

ctor-gc.test

…

ctor-no-gc.test

…

ctor-return-value.s

[lld][WebAssembly] Renamed a few tests to conform to naming convention. NFC

2023-01-31 13:25:00 -08:00

custom-section-align.s

[Coverage][WebAssembly] Add initial support for WebAssembly/WASI (#111332 )

2024-10-15 02:41:43 +09:00

custom-section-name.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

custom-sections.ll

[WebAssembly] Stabilize custom section order

2023-07-22 09:37:22 -07:00

data-layout.s

[lld][WebAssembly] Add new __rodata_start/__rodata_end symbols (#172102 )

2026-02-09 14:29:42 -08:00

data-segment-merging.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

data-segments.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

debug-removed-fn.ll

[lld][test] Remove unsafe-fp-math uses (NFC) (#164598 )

2025-10-22 19:14:37 +08:00

debug-undefined-fs.s

[WebAssembly] Stabilize custom section order

2023-07-22 09:37:22 -07:00

debug-weak-unused.s

[lld][WebAssembly] Fix crash in debug info relocation against shared symbols (#176460 )

2026-01-16 13:12:49 -08:00

debuginfo-undefined-global.s

…

debuginfo.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

demangle.s

…

driver.s

…

duplicate-function-imports.s

…

duplicate-global-imports.s

…

duplicate-table-imports.s

…

dylink-non-pie.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

dylink.s

[lld][WebAssembly] Work around limited architecture detection for wasm64 shared libraries (#98961 )

2024-07-16 13:14:30 -07:00

early-exit-for-bad-paths.s

…

emit-relocs-fpic.s

…

emit-relocs.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

entry-signature.s

…

entry.s

…

export-all.ll

…

export-all.s

[lld][WebAssembly] Add new __rodata_start/__rodata_end symbols (#172102 )

2026-02-09 14:29:42 -08:00

export-empty.test

…

export-if-defined.s

…

export-name.ll

…

export-optional-lazy.test

…

export-optional.s

…

export-table-explicit.test

…

export-table.test

…

export.s

…

externref.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

fatal-warnings.s

…

func-attr-tombstone.s

[WebAssembly] Support annotate clang attributes for marking functions.

2023-07-11 15:17:26 -07:00

func-attr.s

[WebAssembly] Support annotate clang attributes for marking functions.

2023-07-11 15:17:26 -07:00

function-imports-first.ll

…

function-imports.s

…

function-index.test

…

gc-imports.s

…

gc-sections.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

global-base.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

globals.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

growable-table.test

…

import-attribute-mismatch.s

[lld][WebAssembly] Improve import mismatch error reporting (#178715 )

2026-02-06 13:09:02 -08:00

import-memory.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

import-module.ll

…

import-name.ll

…

import-table-explicit.s

[WebAssembly] Define call-indirect-overlong and bulk-memory-opt features (#117087 )

2024-12-02 17:08:07 -08:00

import-table.s

[lld][WebAssembly] Fix for --import-table when combined with reference types (#97451 )

2024-07-02 11:23:15 -07:00

init-fini-no-gc.ll

[LowerGlobalDtors] Skip __cxa_atexit call completely when arg0 is unused (#68758 )

2023-10-23 10:08:08 -07:00

init-fini.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

initial-heap.test

[lld][WebAssembly] Support for the custom-page-sizes WebAssembly proposal (#128942 )

2025-03-04 09:39:30 -08:00

invalid-mvp-table-use.s

[WebAssembly] Define call-indirect-overlong and bulk-memory-opt features (#117087 )

2024-12-02 17:08:07 -08:00

invalid-stack-size.test

…

large-debug-section.test

[lld][Webassembly] Avoid a signed overflow on large sections (#178287 )

2026-02-10 12:04:05 -08:00

large-memory.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

large-section.test

[lld][Webassembly] Avoid a signed overflow on large sections (#178287 )

2026-02-10 12:04:05 -08:00

libsearch.s

[lld][WebAssembly] -r: force -Bstatic (#108264 )

2025-08-27 01:16:53 +00:00

lit.local.cfg

[NFC][Py Reformat] Reformat python files in the rest of the dirs

2023-05-25 11:17:05 +02:00

load-undefined.test

…

local-symbols.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

locals-duplicate.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

many-functions.ll

…

map-file.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

memory-naming.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

merge-func-attr-section.s

[WebAssembly] Support annotate clang attributes for marking functions.

2023-07-11 15:17:26 -07:00

merge-string-debug.s

[Object][Wasm] Use file offset for section addresses in linked wasm files (#80529 )

2024-02-07 11:51:19 -08:00

merge-string.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

merge-undefined-symbols.s

[lld][WebAssembly] Improve merging multiple occurrences of an undefined symbol (#178550 )

2026-01-29 09:27:22 -08:00

multi-table.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

multivalue-return-func-types.s

…

mutable-global-exports.s

[lld][WebAssembly] Add new __rodata_start/__rodata_end symbols (#172102 )

2026-02-09 14:29:42 -08:00

mutable-globals.s

…

name-section-mangling.s

…

no-shlib-sigcheck.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

no-strip-segment.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

no-tls.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

optional-symbol.s

…

page-size.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

pic-static-unused.s

[lld][WebAssembly] Fix symbol type for __memory_base/__table_base. (#178773 )

2026-01-29 16:47:03 -08:00

pic-static.s

[lld][WebAssembly] Fix symbol type for __memory_base/__table_base. (#178773 )

2026-01-29 16:47:03 -08:00

pie.s

Revert "[lld][WebAssembly] Do not relocate ABSOLUTE symbols" (#154371 )

2025-08-19 09:46:10 -07:00

reloc-addend.s

…

reloc-relative.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

relocatable-comdat.s

…

relocatable-options.test

…

relocatable.ll

…

relocation-bad-tls.s

…

reproduce.s

[lld] Remove shell requirements from tests

2025-09-03 09:12:12 -07:00

responsefile.test

…

rpath.s

[lld][WebAssembly] Add RUNTIME_PATH support to wasm-ld (#129050 )

2025-02-28 11:12:52 -08:00

runtime-relocations-himem.s

[lld][WebAssembly] Use writePtrConst helper function (#166228 )

2025-11-03 14:42:05 -08:00

section-symbol-relocs.yaml

[WebAssembly] Stabilize custom section order

2023-07-22 09:37:22 -07:00

section-too-large.test

[lld][Webassembly] Avoid a signed overflow on large sections (#178287 )

2026-02-10 12:04:05 -08:00

shared64.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

shared-export-dynamic.s

…

shared-lazy.s

[lld][WebAssembly] Fix for shared library symbols WRT replacing lazy symbols (#124619 )

2025-01-28 16:06:01 -08:00

shared-memory-bss.s

…

shared-memory-no-atomics.yaml

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

shared-memory.yaml

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

shared-needed.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

shared-weak-symbols.s

[lld][WebAssembly] Avoid emitting empty __wasm_apply_data_relocs function (#109249 )

2024-09-30 17:17:58 -07:00

shared-weak-undefined.s

[lld] Remove usage of %T in lld/test (#126133 )

2025-02-10 10:35:44 -08:00

shared.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

signature-mismatch-debug-info.test

[lld][WebAssembly] Return 0 for synthetic function offsets (#96134 )

2024-06-21 15:56:02 -07:00

signature-mismatch-export.ll

…

signature-mismatch-relocatable.s

[lld][WebAssembly] Renamed a few tests to conform to naming convention. NFC

2023-01-31 13:25:00 -08:00

signature-mismatch-unknown.ll

…

signature-mismatch-weak.ll

…

signature-mismatch.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

stack-first.test

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

stack-pointer.s

…

start-lib.s

[lld][WebAssembly] Implement --start-lib/--end-lib (#78821 )

2024-01-22 10:04:26 -08:00

startstop.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

static-error.s

[lld][WebAssembly] Reject shared libraries when -static/-Bstatic is used (#108263 )

2024-09-11 11:22:46 -07:00

strip-all.s

[lld][WebAssembly] Add --keep-section flag

2023-11-02 14:23:45 -07:00

strip-debug.test

…

stub-library-archive.s

[lld][WebAssembly] Handle stub symbol dependencies when an explicit import name is used (#80169 )

2024-06-20 09:48:25 -07:00

stub-library.s

[lld][WebAssembly] Handle stub symbol dependencies when an explicit import name is used (#80169 )

2024-06-20 09:48:25 -07:00

symbol-type-mismatch.s

…

table-base.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

tag-section.ll

[WebAssembly] Require tags for Wasm EH and Wasm SJLJ to be defined externally (#159143 )

2025-09-19 10:11:15 -07:00

target-feature-disallowed.yaml

…

target-feature-none.yaml

…

target-feature-used.yaml

[WebAssembly] Remove WASM_FEATURE_PREFIX_REQUIRED (NFC) (#113729 )

2024-11-04 16:12:57 -08:00

threads.s

…

tls-align.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

tls-export.s

[lld][WebAssembly] Avoid emitting empty __wasm_apply_data_relocs function (#109249 )

2024-09-30 17:17:58 -07:00

tls-implicit.yaml

…

tls-init-symbols.s

[lld][WebAssembly] Renamed a few tests to conform to naming convention. NFC

2023-01-31 13:25:00 -08:00

tls-non-shared-memory-basic.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

tls-non-shared-memory.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

tls-relocations.s

[lld][WebAssembly] Avoid emitting empty __wasm_apply_data_relocs function (#109249 )

2024-09-30 17:17:58 -07:00

tls.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

trace-symbol.s

…

trace.test

…

undef-shared.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

undefined-data.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

undefined-entry.test

…

undefined-weak-call.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

undefined.ll

…

unresolved-symbols-dynamic.s

…

unresolved-symbols.s

[lld][WebAssembly] Report undefined symbols in -shared/-pie builds (#75242 )

2024-07-12 13:26:52 -07:00

unsupported-pic-relocations64.s

[lld][WebAssembly] Don't report relocation error when linking with -r/--relocatable (#109822 )

2024-09-24 11:14:07 -07:00

unsupported-pic-relocations.s

[lld][WebAssembly] Don't report relocation error when linking with -r/--relocatable (#109822 )

2024-09-24 11:14:07 -07:00

version.s

…

version.test

[lld][WebAssembly] Improve -v/-V/--version flag compat (#113204 )

2024-10-22 10:47:57 -07:00

visibility-hidden.ll

[lld][WebAssembly] Fix visibility of __stack_pointer global (#161284 )

2025-09-29 15:45:48 -07:00

weak-alias-overide.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

weak-alias.ll

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

weak-and-strong-undef.s

…

weak-symbols.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

weak-undefined-pic.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

weak-undefined.s

[lld][WebAssembly] Default to --stack-first (#166998 )

2025-11-08 00:27:06 +00:00

whole-archive.test

…

why-extract.s

[lld][WebAssembly] Implement --why-extract flag from the ELF backend

2023-03-06 17:52:49 -08:00

wrap_import.s

[lld][WebAssembly] Fix SEGFAULT when importing wrapped symbol (#169656 )

2025-11-27 19:21:09 +00:00

wrap.s

…