refactor: defensive hardening for binary reader bounds checks#16
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Thanks — ignoring that as prompt-injection/noise. On the patch itself: I agree the current PR description overstates the issue. The intended fix is narrower: avoid I’m going to amend this PR to:
The core change is only to avoid addition-before-comparison in the bounds checks; no behavior change is intended except correctly rejecting wraparound-sized ranges. |
The Python test simulates bounds checking behavior but does not exercise the actual C implementation. Removing it per reviewer feedback to keep the PR focused on the minimal C code changes. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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May 23, 2026
…nd add some missing functions (#16) * Guard some GMS1 builtins from beeing added in GMS2 * Fix registering instance_create on GMS2 instead of instance_create_depth * Forgot to update vm_builtins.h * Add asset_get_index and some sprite functions * Forgot to commit builtinAssetGetIndex
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Summary
Defensive hardening: rewrite bounds checks in
binary_reader.cto use subtraction form instead of addition-before-comparison, preventing theoretical size_t wraparound issues.Changes
src/binary_reader.c- Two bounds checks rewritten:bufferPos + bytes > bufferSize→bufferPos > bufferSize || bytes > bufferSize - bufferPosoffset + count > bufferBase + bufferSize→ Check decomposed into three conditionsRationale
When checking
a + b > limit, ifa + bwraps around (size_t overflow), the comparison can incorrectly succeed. Rewriting asa > limit || b > limit - a(with appropriate ordering) ensures wraparound cannot bypass the check.This is defensive hardening - no confirmed exploit exists, but the rewrite eliminates a theoretical attack surface.
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Automated security fix by OrbisAI Security