Better sanitize attr diagnostic #145182
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Better sanitize attr diagnostic #145182
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This change implements the #[sanitize(..)] attribute, which opts to
replace the currently unstable #[no_sanitize]. Essentially the new
attribute works similar as #[no_sanitize], just with more flexible
options regarding where it is applied. E.g. it is possible to turn
a certain sanitizer either on or off:
`#[sanitize(address = "on|off")]`
This attribute now also applies to more places, e.g. it is possible
to turn off a sanitizer for an entire module or impl block:
```rust
\#[sanitize(address = "off")]
mod foo {
fn unsanitized(..) {}
#[sanitize(address = "on")]
fn sanitized(..) {}
}
\#[sanitize(thread = "off")]
impl MyTrait for () {
...
}
```
This attribute is enabled behind the unstable `sanitize` feature.
This removes the #[no_sanitize] attribute, which was behind an unstable feature named no_sanitize. Instead, we introduce the sanitize attribute which is more powerful and allows to be extended in the future (instead of just focusing on turning sanitizers off). This also makes sanitize(kernel_address = ..) attribute work with -Zsanitize=address To do it the same as how clang disables address sanitizer, we now disable ASAN on sanitize(kernel_address = "off") and KASAN on sanitize(address = "off"). The same was added to clang in https://reviews.llvm.org/D44981.
rustbot
added
A-attributes
luca3s
commented
Aug 9, 2025
| error: invalid setting for `address` | ||
| --> $DIR/invalid-sanitize.rs:15:12 | ||
| | | ||
| LL | #[sanitize(address = "bogus")] |
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I would like for this to only mark the "bogus" part. I couldn't figure out how to get the correct span for that.
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☔ The latest upstream changes (presumably #145300) made this pull request unmergeable. Please resolve the merge conflicts. |
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Based on #142681
While working on a new sanitizer i noticed that the error messages here could be better.
This now differentiates between a wrong / nonexisting sanitizer and a wrong / nonexisting value for a valid sanitizer.
This is my first time doing a PR to rustc, so if i probably did something wrong.