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Miri call ABI check: ensure type size+align stay the same #97395

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May 31, 2022
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Miri call ABI check: ensure type size+align stay the same #97395

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9 changes: 8 additions & 1 deletion compiler/rustc_const_eval/src/interpret/terminator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,14 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
// No question
return true;
}
// Compare layout
if caller_abi.layout.size != callee_abi.layout.size
|| caller_abi.layout.align.abi != callee_abi.layout.align.abi
{
// This cannot go well...
// FIXME: What about unsized types?
return false;
}
// The rest *should* be okay, but we are extra conservative.
match (caller_abi.layout.abi, callee_abi.layout.abi) {
// Different valid ranges are okay (once we enforce validity,
// that will take care to make it UB to leave the range, just
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