This repository has been archived by the owner on Nov 1, 2020. It is now read-only.
Fix RhpCallFilterFunclet stack alignment on ARM #7744
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The number of registers pushed to the stack in the RhpCallFilterFunclet prolog on ARM made the stack misaligned (it needs to be aligned on 8 bytes), so the filter funclet and its transitive callees all had misaligned stack. While in many cases this doesn't cause issues, there are cases where it can cause runtime failures or crashes. For example, when the exception filter call chain invokes a varargs function with certain combination of parameter sizes when some of the arguments are supposed to be 8 byte aligned.
This change fixes the problem by pushing one more register as a padding in the RhpCallFilterFunclet (and popping it in the epilog).