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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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4
compiler/rustc_typeck/src/collect.rs
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@ -3009,6 +3009,8 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
codegen_fn_attrs.no_sanitize |= SanitizerSet::CFI;
} else if item.has_name(sym::memory) {
codegen_fn_attrs.no_sanitize |= SanitizerSet::MEMORY;
} else if item.has_name(sym::memtag) {
codegen_fn_attrs.no_sanitize |= SanitizerSet::MEMTAG;
} else if item.has_name(sym::thread) {
codegen_fn_attrs.no_sanitize |= SanitizerSet::THREAD;
} else if item.has_name(sym::hwaddress) {
@ -3016,7 +3018,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
} else {
tcx.sess
.struct_span_err(item.span(), "invalid argument for `no_sanitize`")
.note("expected one of: `address`, `hwaddress`, `memory` or `thread`")
.note("expected one of: `address`, `cfi`, `hwaddress`, `memory`, `memtag`, or `thread`")
.emit();
}
}