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Chaos mode MVP: Skip branch optimization in MachBuffer (#6039)

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* fuzz: Add chaos mode control plane

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fuzz: Skip branch optimization with chaos mode

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fuzz: Rename chaos engine -> control plane

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* chaos mode: refactoring ControlPlane to be passed through the call stack by reference

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Remo Senekowitsch <contact@remsle.dev>

* fuzz: annotate chaos todos

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fuzz: cleanup control plane

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fuzz: remove control plane from compiler context

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fuzz: move control plane into emit state

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fuzz: fix remaining compiler errors

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* fix tests

* refactor emission state ctrl plane accessors

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* centralize conditional compilation of chaos mode

Also cleanup a few straggling dependencies on cranelift-control
that aren't needed anymore.

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* add cranelift-control to published crates

prtest:full

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

* add cranelift-control to public crates

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>

---------

Co-authored-by: Falk Zwimpfer <24669719+FalkZ@users.noreply.github.com>
Co-authored-by: Moritz Waser <mzrw.dev@pm.me>
Co-authored-by: Remo Senekowitsch <contact@remsle.dev>
This commit is contained in:
Remo Senekowitsch
2023-04-05 21:28:46 +02:00
committed by GitHub
parent 064968b01d
commit 7eb8914090
61 changed files with 815 additions and 245 deletions
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[package]
authors = ["The Cranelift Project Developers"]
name = "cranelift-control"
version = "0.96.0"
description = "White-box fuzz testing framework"
license = "Apache-2.0 WITH LLVM-exception"
repository = "https://github.com/bytecodealliance/wasmtime"
readme = "README.md"
keywords = ["fuzz", "test"]
edition.workspace = true
[dependencies]
arbitrary = { version = "1.1.0" }
[features]
# Turn on chaos mode.
# Without this feature, a zero-sized dummy will be compiled
# for the control plane.
chaos = []

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This crate contains the control plane for "chaos mode". It can be used to
inject pseudo-random perturbations into specific sections in the code while
fuzzing. Its compilation is feature-gated to prevent any performance
impact on release builds.

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use arbitrary::Arbitrary;
/// The control plane of chaos mode.
/// Please see the [crate-level documentation](crate).
#[derive(Debug, Clone, Default)]
pub struct ControlPlane {
data: Vec<bool>,
}
impl Arbitrary<'_> for ControlPlane {
fn arbitrary<'a>(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
Ok(Self {
data: u.arbitrary()?,
})
}
}
impl ControlPlane {
/// Returns a pseudo-random boolean if the control plane was constructed
/// with `arbitrary`.
///
/// The default value `false` will always be returned if the
/// pseudo-random data is exhausted or the control plane was constructed
/// with `default`.
pub fn get_decision(&mut self) -> bool {
self.data.pop().unwrap_or_default()
}
}

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//! # Cranelift Control
//!
//! This is the home of the control plane of chaos mode, a compilation feature
//! intended to be turned on for certain fuzz targets. When the feature is
//! turned off, as is normally the case, [ControlPlane] will be a zero-sized
//! type and optimized away.
//!
//! While the feature is turned on, the struct [ControlPlane]
//! provides functionality to tap into pseudo-randomness at specific locations
//! in the code. It may be used for targeted fuzzing of compiler internals,
//! e.g. manipulate heuristic optimizations, clobber undefined register bits
//! etc.
//!
//! There are two ways to acquire a [ControlPlane]:
//! - [arbitrary] for the real deal
//! - [default] for an "empty" control plane which always returns default
//! values
//!
//! [arbitrary]: ControlPlane#method.arbitrary
//! [default]: ControlPlane#method.default
#[cfg(not(feature = "chaos"))]
mod zero_sized;
#[cfg(not(feature = "chaos"))]
pub use zero_sized::*;
#[cfg(feature = "chaos")]
mod chaos;
#[cfg(feature = "chaos")]
pub use chaos::*;

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//! Shims for ControlPlane when chaos mode is disabled. Enables
//! unconditional use of the type and its methods throughout cranelift.
/// A shim for ControlPlane when chaos mode is disabled.
/// Please see the [crate-level documentation](crate).
#[derive(Debug, Clone, Default)]
pub struct ControlPlane {
/// prevent direct instantiation (use `default` instead)
_private: (),
}
/// A shim for ControlPlane's `Arbitrary` implementation when chaos mode is
/// disabled. It doesn't consume any bytes and always returns a default
/// control plane.
impl arbitrary::Arbitrary<'_> for ControlPlane {
fn arbitrary<'a>(_u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
Ok(Self::default())
}
}
impl ControlPlane {
/// Returns a pseudo-random boolean. This variant is used when chaos
/// mode is disabled. It always returns `false`.
#[inline]
pub fn get_decision(&mut self) -> bool {
false
}
}