Fix cksum oom panic

src/uu/cksum/src/cksum.rs

@@ -64,7 +64,24 @@ fn maybe_sanitize_length(
         // will have its extra bits set to zero.
         (Some(AlgoKind::Shake128 | AlgoKind::Shake256), Some(len)) => match len.parse::<usize>() {
             Ok(0) => Ok(None),
-            Ok(l) => Ok(Some(HashLength::from_bits(l))),
+            Ok(l) => {
+                const BITS_PER_BYTE: usize = 8;
+                const OOM_SAFETY_CUSHION_BYTES: usize = 65536;
+                let bytes_needed = l.div_ceil(BITS_PER_BYTE);
+
+                let mut test_buffer: Vec<u8> = Vec::new();
+
+                let safety_cushion = bytes_needed.saturating_add(OOM_SAFETY_CUSHION_BYTES);
+
+                if test_buffer.try_reserve(safety_cushion).is_err() {
+                    return Err(uucore::error::USimpleError::new(
+                        1,
+                        translate!("memory exhausted"),
+                    ));
+                }
+
+                Ok(Some(HashLength::from_bits(l)))
+            }
             Err(_) => Err(ChecksumError::InvalidLength(len.into()).into()),
         },
 
@@ -115,7 +132,6 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     if matches.get_flag(options::DEBUG) {
         print_cpu_debug_info();
     }
-
     checksum_main(algo_cli, length, matches, output_format)
 }
 

src/uu/false/src/false.rs

@@ -35,6 +35,7 @@ pub fn uu_app() -> Command {
         .version(crate_version!())
         .help_template(uucore::localized_help_template("false"))
         .about(translate!("false-about"))
+        .override_usage(translate!("false-usage"))
         // We provide our own help and version options, to ensure maximum compatibility with GNU.
         .disable_help_flag(true)
         .disable_version_flag(true)

src/uu/true/src/true.rs

@@ -40,6 +40,7 @@ pub fn uu_app() -> Command {
         .version(crate_version!())
         .help_template(uucore::localized_help_template("true"))
         .about(translate!("true-about"))
+        .override_usage(translate!("true-usage"))
         // We provide our own help and version options, to ensure maximum compatibility with GNU.
         .disable_help_flag(true)
         .disable_version_flag(true)