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invalid_value: also detect transmute-from-0 (seen in the wild)
This commit is contained in:
Ralf Jung
parent
9ab1d5c73a
commit
a9efa738ab
@ -1879,12 +1879,38 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
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#[derive(Debug, Copy, Clone, PartialEq)]
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enum InitKind { Zeroed, Uninit };
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/// Information about why a type cannot be initialized this way.
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/// Contains an error message and optionally a span to point at.
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type InitError = (String, Option<Span>);
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/// Test if this constant is all-0.
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fn is_zero(expr: &hir::Expr) -> bool {
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use hir::ExprKind::*;
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use syntax::ast::LitKind::*;
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match &expr.node {
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Lit(lit) =>
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if let Int(i, _) = lit.node {
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i == 0
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} else {
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false
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},
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Tup(tup) =>
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tup.iter().all(is_zero),
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_ =>
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false
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}
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}
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/// Determine if this expression is a "dangerous initialization".
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fn is_dangerous_init(cx: &LateContext<'_, '_>, expr: &hir::Expr) -> Option<InitKind> {
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const ZEROED_PATH: &[Symbol] = &[sym::core, sym::mem, sym::zeroed];
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const UININIT_PATH: &[Symbol] = &[sym::core, sym::mem, sym::uninitialized];
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// `transmute` is inside an anonymous module (the `extern` block?);
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// `Invalid` represents the empty string and matches that.
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const TRANSMUTE_PATH: &[Symbol] =
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&[sym::core, sym::intrinsics, kw::Invalid, sym::transmute];
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if let hir::ExprKind::Call(ref path_expr, ref _args) = expr.node {
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if let hir::ExprKind::Call(ref path_expr, ref args) = expr.node {
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if let hir::ExprKind::Path(ref qpath) = path_expr.node {
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if let Some(def_id) = cx.tables.qpath_res(qpath, path_expr.hir_id)
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.opt_def_id()
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@ -1895,9 +1921,13 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
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if cx.match_def_path(def_id, &UININIT_PATH) {
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return Some(InitKind::Uninit);
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}
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if cx.match_def_path(def_id, &TRANSMUTE_PATH) {
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if is_zero(&args[0]) {
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return Some(InitKind::Zeroed);
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}
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}
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// FIXME: Also detect `MaybeUninit::zeroed().assume_init()` and
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// `MaybeUninit::uninit().assume_init()`.
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// FIXME: Also detect `transmute` from 0.
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}
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}
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}
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@ -1905,10 +1935,6 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
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None
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}
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/// Information about why a type cannot be initialized this way.
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/// Contains an error message and optionally a span to point at.
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type InitError = (String, Option<Span>);
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/// Return `Some` only if we are sure this type does *not*
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/// allow zero initialization.
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fn ty_find_init_error<'tcx>(
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@ -7,6 +7,7 @@
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#![deny(invalid_value)]
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use std::mem::{self, MaybeUninit};
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use std::num::NonZeroU32;
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enum Void {}
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@ -75,6 +76,11 @@ fn main() {
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let _val: NonBig = mem::zeroed();
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let _val: NonBig = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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// Transmute-from-0
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let _val: &'static i32 = mem::transmute(0usize); //~ ERROR: does not permit zero-initialization
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let _val: &'static [i32] = mem::transmute((0usize, 0usize)); //~ ERROR: does not permit zero-initialization
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let _val: NonZeroU32 = mem::transmute(0); //~ ERROR: does not permit zero-initialization
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// Some more types that should work just fine.
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let _val: Option<&'static i32> = mem::zeroed();
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let _val: Option<fn()> = mem::zeroed();
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@ -1,5 +1,5 @@
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error: the type `&'static T` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:27:32
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--> $DIR/uninitialized-zeroed.rs:28:32
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LL | let _val: &'static T = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -15,7 +15,7 @@ LL | #![deny(invalid_value)]
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= note: References must be non-null
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error: the type `&'static T` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:28:32
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--> $DIR/uninitialized-zeroed.rs:29:32
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LL | let _val: &'static T = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -26,7 +26,7 @@ LL | let _val: &'static T = mem::uninitialized();
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= note: References must be non-null
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error: the type `Wrap<&'static T>` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:30:38
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--> $DIR/uninitialized-zeroed.rs:31:38
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LL | let _val: Wrap<&'static T> = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -35,13 +35,13 @@ LL | let _val: Wrap<&'static T> = mem::zeroed();
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| help: use `MaybeUninit<T>` instead
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note: References must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:16:18
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--> $DIR/uninitialized-zeroed.rs:17:18
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LL | struct Wrap<T> { wrapped: T }
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| ^^^^^^^^^^
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error: the type `Wrap<&'static T>` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:31:38
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--> $DIR/uninitialized-zeroed.rs:32:38
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LL | let _val: Wrap<&'static T> = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -50,13 +50,13 @@ LL | let _val: Wrap<&'static T> = mem::uninitialized();
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| help: use `MaybeUninit<T>` instead
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note: References must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:16:18
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--> $DIR/uninitialized-zeroed.rs:17:18
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LL | struct Wrap<T> { wrapped: T }
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| ^^^^^^^^^^
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error: the type `!` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:38:23
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--> $DIR/uninitialized-zeroed.rs:39:23
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LL | let _val: ! = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -67,7 +67,7 @@ LL | let _val: ! = mem::zeroed();
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= note: The never type (`!`) has no valid value
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error: the type `!` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:39:23
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--> $DIR/uninitialized-zeroed.rs:40:23
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LL | let _val: ! = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -78,7 +78,7 @@ LL | let _val: ! = mem::uninitialized();
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= note: The never type (`!`) has no valid value
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error: the type `(i32, !)` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:41:30
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--> $DIR/uninitialized-zeroed.rs:42:30
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LL | let _val: (i32, !) = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -89,7 +89,7 @@ LL | let _val: (i32, !) = mem::zeroed();
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= note: The never type (`!`) has no valid value
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error: the type `(i32, !)` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:42:30
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--> $DIR/uninitialized-zeroed.rs:43:30
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LL | let _val: (i32, !) = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -100,7 +100,7 @@ LL | let _val: (i32, !) = mem::uninitialized();
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= note: The never type (`!`) has no valid value
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error: the type `Void` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:44:26
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--> $DIR/uninitialized-zeroed.rs:45:26
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LL | let _val: Void = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -111,7 +111,7 @@ LL | let _val: Void = mem::zeroed();
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= note: 0-variant enums have no valid value
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error: the type `Void` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:45:26
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--> $DIR/uninitialized-zeroed.rs:46:26
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LL | let _val: Void = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -122,7 +122,7 @@ LL | let _val: Void = mem::uninitialized();
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= note: 0-variant enums have no valid value
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error: the type `&'static i32` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:47:34
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--> $DIR/uninitialized-zeroed.rs:48:34
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LL | let _val: &'static i32 = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -133,7 +133,7 @@ LL | let _val: &'static i32 = mem::zeroed();
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= note: References must be non-null
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error: the type `&'static i32` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:48:34
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--> $DIR/uninitialized-zeroed.rs:49:34
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LL | let _val: &'static i32 = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -144,7 +144,7 @@ LL | let _val: &'static i32 = mem::uninitialized();
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= note: References must be non-null
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error: the type `Ref` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:50:25
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--> $DIR/uninitialized-zeroed.rs:51:25
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LL | let _val: Ref = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -153,13 +153,13 @@ LL | let _val: Ref = mem::zeroed();
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| help: use `MaybeUninit<T>` instead
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note: References must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:13:12
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--> $DIR/uninitialized-zeroed.rs:14:12
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LL | struct Ref(&'static i32);
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| ^^^^^^^^^^^^
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error: the type `Ref` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:51:25
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--> $DIR/uninitialized-zeroed.rs:52:25
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LL | let _val: Ref = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -168,13 +168,13 @@ LL | let _val: Ref = mem::uninitialized();
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| help: use `MaybeUninit<T>` instead
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note: References must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:13:12
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--> $DIR/uninitialized-zeroed.rs:14:12
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LL | struct Ref(&'static i32);
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| ^^^^^^^^^^^^
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error: the type `fn()` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:53:26
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--> $DIR/uninitialized-zeroed.rs:54:26
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LL | let _val: fn() = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -185,7 +185,7 @@ LL | let _val: fn() = mem::zeroed();
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= note: Function pointers must be non-null
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error: the type `fn()` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:54:26
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--> $DIR/uninitialized-zeroed.rs:55:26
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LL | let _val: fn() = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -196,7 +196,7 @@ LL | let _val: fn() = mem::uninitialized();
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= note: Function pointers must be non-null
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error: the type `Wrap<fn()>` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:56:32
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--> $DIR/uninitialized-zeroed.rs:57:32
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LL | let _val: Wrap<fn()> = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -205,13 +205,13 @@ LL | let _val: Wrap<fn()> = mem::zeroed();
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| help: use `MaybeUninit<T>` instead
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note: Function pointers must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:16:18
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--> $DIR/uninitialized-zeroed.rs:17:18
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LL | struct Wrap<T> { wrapped: T }
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| ^^^^^^^^^^
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error: the type `Wrap<fn()>` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:57:32
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--> $DIR/uninitialized-zeroed.rs:58:32
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LL | let _val: Wrap<fn()> = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -220,13 +220,13 @@ LL | let _val: Wrap<fn()> = mem::uninitialized();
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| help: use `MaybeUninit<T>` instead
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note: Function pointers must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:16:18
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--> $DIR/uninitialized-zeroed.rs:17:18
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LL | struct Wrap<T> { wrapped: T }
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| ^^^^^^^^^^
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error: the type `WrapEnum<fn()>` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:59:36
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--> $DIR/uninitialized-zeroed.rs:60:36
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LL | let _val: WrapEnum<fn()> = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -235,13 +235,13 @@ LL | let _val: WrapEnum<fn()> = mem::zeroed();
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| help: use `MaybeUninit<T>` instead
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|
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note: Function pointers must be non-null (in this enum field)
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--> $DIR/uninitialized-zeroed.rs:17:28
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--> $DIR/uninitialized-zeroed.rs:18:28
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|
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LL | enum WrapEnum<T> { Wrapped(T) }
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| ^
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error: the type `WrapEnum<fn()>` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:60:36
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--> $DIR/uninitialized-zeroed.rs:61:36
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|
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LL | let _val: WrapEnum<fn()> = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -250,13 +250,13 @@ LL | let _val: WrapEnum<fn()> = mem::uninitialized();
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| help: use `MaybeUninit<T>` instead
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|
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note: Function pointers must be non-null (in this enum field)
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--> $DIR/uninitialized-zeroed.rs:17:28
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--> $DIR/uninitialized-zeroed.rs:18:28
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|
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LL | enum WrapEnum<T> { Wrapped(T) }
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| ^
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error: the type `Wrap<(RefPair, i32)>` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:62:42
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--> $DIR/uninitialized-zeroed.rs:63:42
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|
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LL | let _val: Wrap<(RefPair, i32)> = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -265,13 +265,13 @@ LL | let _val: Wrap<(RefPair, i32)> = mem::zeroed();
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| help: use `MaybeUninit<T>` instead
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|
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note: References must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:14:16
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--> $DIR/uninitialized-zeroed.rs:15:16
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|
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LL | struct RefPair((&'static i32, i32));
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| ^^^^^^^^^^^^^^^^^^^
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error: the type `Wrap<(RefPair, i32)>` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:63:42
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--> $DIR/uninitialized-zeroed.rs:64:42
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|
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LL | let _val: Wrap<(RefPair, i32)> = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -280,13 +280,13 @@ LL | let _val: Wrap<(RefPair, i32)> = mem::uninitialized();
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| help: use `MaybeUninit<T>` instead
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|
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note: References must be non-null (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:14:16
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--> $DIR/uninitialized-zeroed.rs:15:16
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|
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LL | struct RefPair((&'static i32, i32));
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| ^^^^^^^^^^^^^^^^^^^
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error: the type `std::vec::Vec<i32>` does not permit zero-initialization
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--> $DIR/uninitialized-zeroed.rs:65:30
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--> $DIR/uninitialized-zeroed.rs:66:30
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|
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LL | let _val: Vec<i32> = mem::zeroed();
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| ^^^^^^^^^^^^^
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@ -301,7 +301,7 @@ LL | ptr: Unique<T>,
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| ^^^^^^^^^^^^^^
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error: the type `std::vec::Vec<i32>` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:66:30
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--> $DIR/uninitialized-zeroed.rs:67:30
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|
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LL | let _val: Vec<i32> = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -316,7 +316,7 @@ LL | ptr: Unique<T>,
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| ^^^^^^^^^^^^^^
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error: the type `bool` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:70:26
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--> $DIR/uninitialized-zeroed.rs:71:26
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|
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LL | let _val: bool = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -327,7 +327,7 @@ LL | let _val: bool = mem::uninitialized();
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= note: Booleans must be `true` or `false`
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error: the type `Wrap<char>` does not permit being left uninitialized
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--> $DIR/uninitialized-zeroed.rs:73:32
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--> $DIR/uninitialized-zeroed.rs:74:32
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|
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LL | let _val: Wrap<char> = mem::uninitialized();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -336,13 +336,13 @@ LL | let _val: Wrap<char> = mem::uninitialized();
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| help: use `MaybeUninit<T>` instead
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|
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note: Characters must be a valid unicode codepoint (in this struct field)
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--> $DIR/uninitialized-zeroed.rs:16:18
|
||||
--> $DIR/uninitialized-zeroed.rs:17:18
|
||||
|
|
||||
LL | struct Wrap<T> { wrapped: T }
|
||||
| ^^^^^^^^^^
|
||||
|
||||
error: the type `NonBig` does not permit being left uninitialized
|
||||
--> $DIR/uninitialized-zeroed.rs:76:28
|
||||
--> $DIR/uninitialized-zeroed.rs:77:28
|
||||
|
|
||||
LL | let _val: NonBig = mem::uninitialized();
|
||||
| ^^^^^^^^^^^^^^^^^^^^
|
||||
@ -352,5 +352,38 @@ LL | let _val: NonBig = mem::uninitialized();
|
||||
|
|
||||
= note: NonBig must be initialized inside its custom valid range
|
||||
|
||||
error: aborting due to 27 previous errors
|
||||
error: the type `&'static i32` does not permit zero-initialization
|
||||
--> $DIR/uninitialized-zeroed.rs:80:34
|
||||
|
|
||||
LL | let _val: &'static i32 = mem::transmute(0usize);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| this code causes undefined behavior when executed
|
||||
| help: use `MaybeUninit<T>` instead
|
||||
|
|
||||
= note: References must be non-null
|
||||
|
||||
error: the type `&'static [i32]` does not permit zero-initialization
|
||||
--> $DIR/uninitialized-zeroed.rs:81:36
|
||||
|
|
||||
LL | let _val: &'static [i32] = mem::transmute((0usize, 0usize));
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| this code causes undefined behavior when executed
|
||||
| help: use `MaybeUninit<T>` instead
|
||||
|
|
||||
= note: References must be non-null
|
||||
|
||||
error: the type `std::num::NonZeroU32` does not permit zero-initialization
|
||||
--> $DIR/uninitialized-zeroed.rs:82:32
|
||||
|
|
||||
LL | let _val: NonZeroU32 = mem::transmute(0);
|
||||
| ^^^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| this code causes undefined behavior when executed
|
||||
| help: use `MaybeUninit<T>` instead
|
||||
|
|
||||
= note: std::num::NonZeroU32 must be non-null
|
||||
|
||||
error: aborting due to 30 previous errors
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user