Run the echo fuzzer in the CI

.github/workflows/fuzzing.yml

@@ -42,6 +42,7 @@ jobs:
           - { name: fuzz_date, should_pass: false }
           - { name: fuzz_expr, should_pass: true }
           - { name: fuzz_printf, should_pass: false }
+          - { name: fuzz_echo, should_pass: false }
           - { name: fuzz_parse_glob, should_pass: true }
           - { name: fuzz_parse_size, should_pass: true }
           - { name: fuzz_parse_time, should_pass: true }

fuzz/fuzz_targets/fuzz_echo.rs

@@ -1,6 +1,6 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
-use uu_echo::uumain; // Changed from uu_printf to uu_echo
+use uu_echo::uumain;
 
 use rand::prelude::SliceRandom;
 use rand::Rng;
@@ -12,7 +12,7 @@ use crate::fuzz_common::{
     compare_result, generate_and_run_uumain, generate_random_string, run_gnu_cmd,
 };
 
-static CMD_PATH: &str = "/usr/bin/echo"; // Changed from "printf" to "echo"
+static CMD_PATH: &str = "echo";
 
 fn generate_echo() -> String {
     let mut rng = rand::thread_rng();
@@ -22,7 +22,6 @@ fn generate_echo() -> String {
     let include_n = rng.gen_bool(0.1); // 10% chance
     let include_e = rng.gen_bool(0.1); // 10% chance
     let include_E = rng.gen_bool(0.1); // 10% chance
-                                       // --help and --version are typically not included in fuzzing as they don't change output format
 
     if include_n {
         echo_str.push_str("-n ");
@@ -41,29 +40,25 @@ fn generate_echo() -> String {
     if include_e {
         // Add a 10% chance of including an escape sequence
         if rng.gen_bool(0.1) {
-            echo_str.push_str(&generate_escape_sequence(&mut rng)); // This function should handle echo-specific sequences
+            echo_str.push_str(&generate_escape_sequence(&mut rng));
         }
     }
 
     echo_str
 }
 
-// You should also modify the generate_escape_sequence function to include echo-specific sequences
 fn generate_escape_sequence(rng: &mut impl Rng) -> String {
     let escape_sequences = [
-        "\\\\", "\\a", "\\b", "\\c", "\\e", "\\f", "\\n", "\\r", "\\t", "\\v",
-        "\\0NNN", // You can randomly generate NNN
-        "\\xHH",  // You can randomly generate HH
-                  // ... other sequences
+        "\\\\", "\\a", "\\b", "\\c", "\\e", "\\f", "\\n", "\\r", "\\t", "\\v", "\\0NNN", "\\xHH",
     ];
     escape_sequences.choose(rng).unwrap().to_string()
 }
 
 fuzz_target!(|_data: &[u8]| {
-    let echo_input = generate_echo(); // Changed from generate_printf to generate_echo
-    let mut args = vec![OsString::from("echo")]; // Changed from "printf" to "echo"
+    let echo_input = generate_echo();
+    let mut args = vec![OsString::from("echo")];
     args.extend(echo_input.split_whitespace().map(OsString::from));
-    let rust_result = generate_and_run_uumain(&args, uumain); // uumain function from uu_echo
+    let rust_result = generate_and_run_uumain(&args, uumain);
 
     let gnu_result = match run_gnu_cmd(CMD_PATH, &args[1..], false) {
         Ok(result) => result,
@@ -88,6 +83,6 @@ fuzz_target!(|_data: &[u8]| {
         &gnu_result.stderr,
         rust_result.exit_code,
         gnu_result.exit_code,
-        false, // Set to true if you want to fail on stderr diff
+        true,
     );
 });