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Apr 29, 2025
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Rust: Extract SelfParams from crate graph #19369

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6df5a1e
Rust: Extract `SelfParam`s from crate graph
hvitved Apr 24, 2025
7e20536
Rust: Adjust `clone` modeling
hvitved Apr 25, 2025
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45 changes: 37 additions & 8 deletions rust/extractor/src/crate_graph.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -383,25 +383,54 @@ fn emit_function(
assert_eq!(sig.binders.len(Interner), parameters.len());
let sig = sig.skip_binders();
let ty_vars = &[parameters];
let function_data = db.function_data(function);
let mut self_param = None;
let params = sig
.params()
.iter()
.map(|p| {
.enumerate()
.filter_map(|(idx, p)| {
let type_repr = emit_hir_ty(trap, db, ty_vars, p);
trap.emit(generated::Param {
id: trap::TrapId::Star,
attrs: vec![],
type_repr,
pat: None,
})

if idx == 0 && function_data.has_self_param() {
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Copilot AI Apr 25, 2025

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Consider extracting the self parameter logic into a separate helper function to improve clarity and reduce complexity in the parameter iteration block.

Copilot uses AI. Check for mistakes.

// Check if the self parameter is a reference
let (is_ref, is_mut) = match p.kind(Interner) {
chalk_ir::TyKind::Ref(mutability, _, _) => {
(true, matches!(mutability, chalk_ir::Mutability::Mut))
}
chalk_ir::TyKind::Raw(mutability, _) => {
(false, matches!(mutability, chalk_ir::Mutability::Mut))
}
_ => (false, false),
};

self_param = Some(trap.emit(generated::SelfParam {
id: trap::TrapId::Star,
attrs: vec![],
type_repr,
is_ref,
is_mut,
lifetime: None,
name: None,
Comment on lines +413 to +414
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Shouldn't the name be simply self? Is it possible to populate the lifetime field, or is it not important?

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I decided to not populate the name, since we also don't do that for non-self parameters. Lifetimes are currently not important.

}));
None
} else {
Some(trap.emit(generated::Param {
id: trap::TrapId::Star,
attrs: vec![],
type_repr,
pat: None,
}))
}
})
.collect();

let ret_type = emit_hir_ty(trap, db, ty_vars, sig.ret());

let param_list = trap.emit(generated::ParamList {
id: trap::TrapId::Star,
params,
self_param: None,
self_param,
});
let ret_type = ret_type.map(|ret_type| {
trap.emit(generated::RetTypeRepr {
Expand Down
4 changes: 3 additions & 1 deletion rust/ql/lib/codeql/rust/frameworks/stdlib/Clone.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,9 @@ final class CloneCallable extends SummarizedCallable::Range {
final override predicate propagatesFlow(
string input, string output, boolean preservesValue, string model
) {
input = "Argument[self]" and
// The `clone` method takes a `&self` parameter and dereferences it;
// make sure to not clone the reference itself
input = ["Argument[self].Reference", "Argument[self].WithoutReference"] and
output = "ReturnValue" and
preservesValue = true and
model = "generated"
Expand Down
6 changes: 6 additions & 0 deletions rust/ql/test/library-tests/dataflow/modeled/inline-flow.expected
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Original file line number Diff line number Diff line change
Expand Up @@ -8,18 +8,22 @@ models
| 7 | Summary: lang:core; crate::ptr::write; Argument[1]; Argument[0].Reference; value |
edges
| main.rs:12:9:12:9 | a [Some] | main.rs:13:10:13:19 | a.unwrap() | provenance | MaD:2 |
| main.rs:12:9:12:9 | a [Some] | main.rs:14:13:14:13 | a [Some] | provenance | |
| main.rs:12:9:12:9 | a [Some] | main.rs:14:13:14:21 | a.clone() [Some] | provenance | MaD:1 |
| main.rs:12:9:12:9 | a [Some] | main.rs:14:13:14:21 | a.clone() [Some] | provenance | generated |
| main.rs:12:13:12:28 | Some(...) [Some] | main.rs:12:9:12:9 | a [Some] | provenance | |
| main.rs:12:18:12:27 | source(...) | main.rs:12:13:12:28 | Some(...) [Some] | provenance | |
| main.rs:14:9:14:9 | b [Some] | main.rs:15:10:15:19 | b.unwrap() | provenance | MaD:2 |
| main.rs:14:13:14:13 | a [Some] | main.rs:14:13:14:21 | a.clone() [Some] | provenance | generated |
| main.rs:14:13:14:21 | a.clone() [Some] | main.rs:14:9:14:9 | b [Some] | provenance | |
| main.rs:19:9:19:9 | a [Ok] | main.rs:20:10:20:19 | a.unwrap() | provenance | MaD:5 |
| main.rs:19:9:19:9 | a [Ok] | main.rs:21:13:21:13 | a [Ok] | provenance | |
| main.rs:19:9:19:9 | a [Ok] | main.rs:21:13:21:21 | a.clone() [Ok] | provenance | MaD:4 |
| main.rs:19:9:19:9 | a [Ok] | main.rs:21:13:21:21 | a.clone() [Ok] | provenance | generated |
| main.rs:19:31:19:44 | Ok(...) [Ok] | main.rs:19:9:19:9 | a [Ok] | provenance | |
| main.rs:19:34:19:43 | source(...) | main.rs:19:31:19:44 | Ok(...) [Ok] | provenance | |
| main.rs:21:9:21:9 | b [Ok] | main.rs:22:10:22:19 | b.unwrap() | provenance | MaD:5 |
| main.rs:21:13:21:13 | a [Ok] | main.rs:21:13:21:21 | a.clone() [Ok] | provenance | generated |
| main.rs:21:13:21:21 | a.clone() [Ok] | main.rs:21:9:21:9 | b [Ok] | provenance | |
| main.rs:26:9:26:9 | a | main.rs:27:10:27:10 | a | provenance | |
| main.rs:26:9:26:9 | a | main.rs:28:13:28:21 | a.clone() | provenance | generated |
Expand Down Expand Up @@ -57,13 +61,15 @@ nodes
| main.rs:12:18:12:27 | source(...) | semmle.label | source(...) |
| main.rs:13:10:13:19 | a.unwrap() | semmle.label | a.unwrap() |
| main.rs:14:9:14:9 | b [Some] | semmle.label | b [Some] |
| main.rs:14:13:14:13 | a [Some] | semmle.label | a [Some] |
| main.rs:14:13:14:21 | a.clone() [Some] | semmle.label | a.clone() [Some] |
| main.rs:15:10:15:19 | b.unwrap() | semmle.label | b.unwrap() |
| main.rs:19:9:19:9 | a [Ok] | semmle.label | a [Ok] |
| main.rs:19:31:19:44 | Ok(...) [Ok] | semmle.label | Ok(...) [Ok] |
| main.rs:19:34:19:43 | source(...) | semmle.label | source(...) |
| main.rs:20:10:20:19 | a.unwrap() | semmle.label | a.unwrap() |
| main.rs:21:9:21:9 | b [Ok] | semmle.label | b [Ok] |
| main.rs:21:13:21:13 | a [Ok] | semmle.label | a [Ok] |
| main.rs:21:13:21:21 | a.clone() [Ok] | semmle.label | a.clone() [Ok] |
| main.rs:22:10:22:19 | b.unwrap() | semmle.label | b.unwrap() |
| main.rs:26:9:26:9 | a | semmle.label | a |
Expand Down
3 changes: 2 additions & 1 deletion rust/ql/test/library-tests/type-inference/type-inference.ql
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Expand Up @@ -4,7 +4,8 @@ import codeql.rust.internal.TypeInference as TypeInference
import TypeInference

query predicate inferType(AstNode n, TypePath path, Type t) {
t = TypeInference::inferType(n, path)
t = TypeInference::inferType(n, path) and
n.fromSource()
}

module ResolveTest implements TestSig {
Expand Down
13 changes: 13 additions & 0 deletions rust/ql/test/query-tests/security/CWE-089/CONSISTENCY/PathResolutionConsistency.expected
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@@ -0,0 +1,13 @@
multipleMethodCallTargets
| sqlx.rs:65:30:65:52 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:65:30:65:52 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:65:30:65:52 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:65:30:65:52 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:65:30:65:52 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:65:30:65:52 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:76:29:76:51 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:76:29:76:51 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:76:29:76:51 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:76:29:76:51 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:76:29:76:51 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |
| sqlx.rs:76:29:76:51 | unsafe_query_2.as_str() | file://:0:0:0:0 | fn as_str |