Auto merge of #90460 - pietroalbini:bidi-stable, r=nikomatsakis,pietroalbini 1.56.1

[stable] Fix CVE-2021-42574 and prepare Rust 1.56.1

This PR implements new lints to mitigate the impact of [CVE-2021-42574], caused by the presence of bidirectional-override Unicode codepoints in the compiled source code. [See the advisory][advisory] for more information about the vulnerability.

The changes in this PR will be released later today as part of Rust 1.56.1.

[CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
[advisory]: https://blog.rust-lang.org/2021/11/01/cve-2021-42574.html

1 files changed, 39 insertions, 0 deletions

diff --git a/src/test/ui/parser/unicode-control-codepoints.rs b/src/test/ui/parser/unicode-control-codepoints.rs
new file mode 100644
index 00000000000..5af0b585a12
--- /dev/null
+++ b/src/test/ui/parser/unicode-control-codepoints.rs
@@ -0,0 +1,39 @@
+fn main() {
+    // if access_level != "us‫e‪r" { // Check if admin
+    //~^ ERROR unicode codepoint changing visible direction of text present in comment
+    println!("us\u{202B}e\u{202A}r");
+    println!("{:?}", r#"us\u{202B}e\u{202A}r"#);
+    println!("{:?}", b"us\u{202B}e\u{202A}r");
+    //~^ ERROR unicode escape in byte string
+    //~| ERROR unicode escape in byte string
+    println!("{:?}", br##"us\u{202B}e\u{202A}r"##);
+
+    println!("{:?}", "/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only ");
+    //~^ ERROR unicode codepoint changing visible direction of text present in literal
+
+    println!("{:?}", r##"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only "##);
+    //~^ ERROR unicode codepoint changing visible direction of text present in literal
+    println!("{:?}", b"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only ");
+    //~^ ERROR non-ASCII character in byte constant
+    //~| ERROR non-ASCII character in byte constant
+    //~| ERROR non-ASCII character in byte constant
+    //~| ERROR non-ASCII character in byte constant
+    println!("{:?}", br##"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only "##);
+    //~^ ERROR raw byte string must be ASCII
+    //~| ERROR raw byte string must be ASCII
+    //~| ERROR raw byte string must be ASCII
+    //~| ERROR raw byte string must be ASCII
+    println!("{:?}", '‮');
+    //~^ ERROR unicode codepoint changing visible direction of text present in literal
+}
+
+//"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only */"
+//~^ ERROR unicode codepoint changing visible direction of text present in comment
+
+/**  '‮'); */fn foo() {}
+//~^ ERROR unicode codepoint changing visible direction of text present in doc comment
+
+/**
+ *
+ *  '‮'); */fn bar() {}
+//~^^^ ERROR unicode codepoint changing visible direction of text present in doc comment