55 lines
2.2 KiB
Rust
55 lines
2.2 KiB
Rust
use clippy_utils::diagnostics::span_lint_and_then;
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use clippy_utils::ty::is_type_diagnostic_item;
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use rustc_ast::ast::LitKind;
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use rustc_hir::{Expr, ExprKind};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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use rustc_span::sym;
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declare_clippy_lint! {
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/// ### What it does
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/// Checks for calls to `std::fs::Permissions.set_readonly` with argument `false`.
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///
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/// ### Why is this bad?
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/// On Unix platforms this results in the file being world writable,
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/// equivalent to `chmod a+w <file>`.
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/// ### Example
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/// ```no_run
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/// use std::fs::File;
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/// let f = File::create("foo.txt").unwrap();
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/// let metadata = f.metadata().unwrap();
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/// let mut permissions = metadata.permissions();
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/// permissions.set_readonly(false);
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/// ```
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#[clippy::version = "1.68.0"]
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pub PERMISSIONS_SET_READONLY_FALSE,
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suspicious,
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"Checks for calls to `std::fs::Permissions.set_readonly` with argument `false`"
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}
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declare_lint_pass!(PermissionsSetReadonlyFalse => [PERMISSIONS_SET_READONLY_FALSE]);
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impl<'tcx> LateLintPass<'tcx> for PermissionsSetReadonlyFalse {
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fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
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if let ExprKind::MethodCall(path, receiver, [arg], _) = &expr.kind
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&& is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(receiver), sym::FsPermissions)
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&& path.ident.name == sym!(set_readonly)
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&& let ExprKind::Lit(lit) = &arg.kind
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&& LitKind::Bool(false) == lit.node
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{
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span_lint_and_then(
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cx,
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PERMISSIONS_SET_READONLY_FALSE,
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expr.span,
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"call to `set_readonly` with argument `false`",
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|diag| {
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diag.note("on Unix platforms this results in the file being world writable");
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diag.help(
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"you can set the desired permissions using `PermissionsExt`. For more information, see\n\
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https://doc.rust-lang.org/std/os/unix/fs/trait.PermissionsExt.html",
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);
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},
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);
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}
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}
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}
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