bjoernager/rust
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Add SafeStack support to rustc

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Adds support for LLVM [SafeStack] which provides backward edge control
flow protection by separating the stack into two parts: data which is
only accessed in provable safe ways is allocated on the normal stack
(the "safe stack") and all other data is placed in a separate allocation
(the "unsafe stack").

SafeStack support is enabled by passing `-Zsanitizer=safestack`.

[SafeStack]: https://clang.llvm.org/docs/SafeStack.html
This commit is contained in:
Wesley Wiser 2023-05-19 19:30:15 -04:00
parent d22314e0f5
commit 019d75b44e
14 changed files with 71 additions and 10 deletions
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3
compiler/rustc_codegen_llvm/src/attributes.rs
View file

@ -88,6 +88,9 @@ pub fn sanitize_attrs<'ll>(
attrs.push(llvm::AttributeKind::SanitizeMemTag.create_attr(cx.llcx));
}
if enabled.contains(SanitizerSet::SAFESTACK) {
attrs.push(llvm::AttributeKind::SanitizeSafeStack.create_attr(cx.llcx));
}
attrs
}

1
compiler/rustc_codegen_llvm/src/llvm/ffi.rs
View file

@ -196,6 +196,7 @@ pub enum AttributeKind {
AllocSize = 37,
AllocatedPointer = 38,
AllocAlign = 39,
SanitizeSafeStack = 40,
}
/// LLVMIntPredicate