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Rollup merge of #91675 - ivanloz:memtagsan, r=nagisa

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Add MemTagSanitizer Support

Add support for the LLVM [MemTagSanitizer](https://llvm.org/docs/MemTagSanitizer.html).

On hardware which supports it (see caveats below), the MemTagSanitizer can catch bugs similar to AddressSanitizer and HardwareAddressSanitizer, but with lower overhead.

On a tag mismatch, a SIGSEGV is signaled with code SEGV_MTESERR / SEGV_MTEAERR.

# Usage

`-Zsanitizer=memtag -C target-feature="+mte"`

# Comments/Caveats

* MemTagSanitizer is only supported on AArch64 targets with hardware support
* Requires `-C target-feature="+mte"`
* LLVM MemTagSanitizer currently only performs stack tagging.

# TODO

* Tests
* Example
This commit is contained in:
Matthias Krüger 2022-02-18 23:23:03 +01:00 • committed by GitHub
commit 0bb72a2c66
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15 changed files with 67 additions and 6 deletions
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13
compiler/rustc_codegen_llvm/src/attributes.rs
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@ -55,6 +55,19 @@ pub fn sanitize<'ll>(cx: &CodegenCx<'ll, '_>, no_sanitize: SanitizerSet, llfn: &
if enabled.contains(SanitizerSet::HWADDRESS) {
llvm::Attribute::SanitizeHWAddress.apply_llfn(Function, llfn);
}
if enabled.contains(SanitizerSet::MEMTAG) {
// Check to make sure the mte target feature is actually enabled.
let sess = cx.tcx.sess;
let features = llvm_util::llvm_global_features(sess).join(",");
let mte_feature_enabled = features.rfind("+mte");
let mte_feature_disabled = features.rfind("-mte");
if mte_feature_enabled.is_none() || (mte_feature_disabled > mte_feature_enabled) {
sess.err("`-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`");
}
llvm::Attribute::SanitizeMemTag.apply_llfn(Function, llfn);
}
}
/// Tell LLVM to emit or not emit the information necessary to unwind the stack for the function.