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Allow disabling ASan instrumentation for globals

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AddressSanitizer adds instrumentation to global variables unless the
[`no_sanitize_address`](https://llvm.org/docs/LangRef.html#global-attributes)
attribute is set on them.

This commit extends the existing `#[no_sanitize(address)]` attribute to
set this; previously it only had the desired effect on functions.
This commit is contained in:
Daniel Bertalan 2024-07-08 15:49:50 +02:00
parent 00ed73cdc0
commit 204b2281fa
10 changed files with 137 additions and 34 deletions
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19
compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
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@ -1999,6 +1999,25 @@ extern "C" bool LLVMRustLLVMHasZstdCompressionForDebugSymbols() {
return llvm::compression::zstd::isAvailable();
}
extern "C" void LLVMRustSetNoSanitizeAddress(LLVMValueRef Global) {
GlobalValue &GV = *unwrap<GlobalValue>(Global);
GlobalValue::SanitizerMetadata MD;
if (GV.hasSanitizerMetadata())
MD = GV.getSanitizerMetadata();
MD.NoAddress = true;
MD.IsDynInit = false;
GV.setSanitizerMetadata(MD);
}
extern "C" void LLVMRustSetNoSanitizeHWAddress(LLVMValueRef Global) {
GlobalValue &GV = *unwrap<GlobalValue>(Global);
GlobalValue::SanitizerMetadata MD;
if (GV.hasSanitizerMetadata())
MD = GV.getSanitizerMetadata();
MD.NoHWAddress = true;
GV.setSanitizerMetadata(MD);
}
// Operations on composite constants.
// These are clones of LLVM api functions that will become available in future
// releases. They can be removed once Rust's minimum supported LLVM version