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Rollup merge of #127483 - BertalanD:no_sanitize-global-var, r=rcvalle

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Allow disabling ASan instrumentation for globals

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.

(cc https://github.com/rust-lang/rust/issues/39699)
This commit is contained in:
许杰友 Jieyou Xu (Joe) 2024-11-23 20:19:51 +08:00 • committed by GitHub
commit c6d36256a6
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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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@ -2051,6 +2051,25 @@ 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