feat: Expand safe directory traversal to all Unix platforms and fix related type conversions.

.vscode/cspell.dictionaries/acronyms+names.wordlist.txt

@@ -34,6 +34,7 @@ RISCV
 RNG # random number generator
 RNGs
 Solaris
+TOCTOU # time-of-check time-of-use
 UID # user ID
 UIDs
 UUID # universally unique identifier

src/uu/chmod/Cargo.toml

@@ -20,15 +20,12 @@ path = "src/chmod.rs"
 [dependencies]
 clap = { workspace = true }
 thiserror = { workspace = true }
-uucore = { workspace = true, features = [
-  "entries",
-  "fs",
-  "mode",
-  "perms",
-  "safe-traversal",
-] }
+uucore = { workspace = true, features = ["entries", "fs", "mode", "perms"] }
 fluent = { workspace = true }
 
+[target.'cfg(all(unix, not(target_os = "redox")))'.dependencies]
+uucore = { workspace = true, features = ["safe-traversal"] }
+
 [[bin]]
 name = "chmod"
 path = "src/main.rs"

src/uu/chmod/src/chmod.rs

@@ -18,7 +18,7 @@ use uucore::libc::mode_t;
 use uucore::mode;
 use uucore::perms::{TraverseSymlinks, configure_symlink_and_recursion};
 
-#[cfg(target_os = "linux")]
+#[cfg(all(unix, not(target_os = "redox")))]
 use uucore::safe_traversal::DirFd;
 use uucore::{format_usage, show, show_error};
 
@@ -338,7 +338,7 @@ impl Chmoder {
     }
 
     /// Handle symlinks during directory traversal based on traversal mode
-    #[cfg(not(target_os = "linux"))]
+    #[cfg(not(unix))]
     fn handle_symlink_during_traversal(
         &self,
         path: &Path,
@@ -419,7 +419,7 @@ impl Chmoder {
         r
     }
 
-    #[cfg(not(target_os = "linux"))]
+    #[cfg(not(unix))]
     fn walk_dir_with_context(&self, file_path: &Path, is_command_line_arg: bool) -> UResult<()> {
         let mut r = self.chmod_file(file_path);
 
@@ -450,7 +450,34 @@ impl Chmoder {
         r
     }
 
-    #[cfg(target_os = "linux")]
+    #[cfg(target_os = "redox")]
+    fn walk_dir_with_context(&self, file_path: &Path, is_command_line_arg: bool) -> UResult<()> {
+        let mut r = self.chmod_file(file_path);
+
+        // Determine whether to traverse symlinks based on context and traversal mode
+        let should_follow_symlink = match self.traverse_symlinks {
+            TraverseSymlinks::All => true,
+            TraverseSymlinks::First => is_command_line_arg, // Only follow symlinks that are command line args
+            TraverseSymlinks::None => false,
+        };
+
+        // If the path is a directory (or we should follow symlinks), recurse into it
+        if (!file_path.is_symlink() || should_follow_symlink) && file_path.is_dir() {
+            for dir_entry in file_path.read_dir()? {
+                let path = match dir_entry {
+                    Ok(entry) => entry.path(),
+                    Err(err) => {
+                        r = r.and(Err(err.into()));
+                        continue;
+                    }
+                };
+                r = self.walk_dir_with_context(path.as_path(), false).and(r);
+            }
+        }
+        r
+    }
+
+    #[cfg(all(unix, not(target_os = "redox")))]
     fn walk_dir_with_context(&self, file_path: &Path, is_command_line_arg: bool) -> UResult<()> {
         let mut r = self.chmod_file(file_path);
 
@@ -480,7 +507,7 @@ impl Chmoder {
         r
     }
 
-    #[cfg(target_os = "linux")]
+    #[cfg(all(unix, not(target_os = "redox")))]
     fn safe_traverse_dir(&self, dir_fd: &DirFd, dir_path: &Path) -> UResult<()> {
         let mut r = Ok(());
 
@@ -536,7 +563,7 @@ impl Chmoder {
         r
     }
 
-    #[cfg(target_os = "linux")]
+    #[cfg(all(unix, not(target_os = "redox")))]
     fn handle_symlink_during_safe_recursion(
         &self,
         path: &Path,
@@ -568,7 +595,7 @@ impl Chmoder {
         }
     }
 
-    #[cfg(target_os = "linux")]
+    #[cfg(all(unix, not(target_os = "redox")))]
     fn safe_chmod_file(
         &self,
         file_path: &Path,
@@ -598,7 +625,7 @@ impl Chmoder {
         Ok(())
     }
 
-    #[cfg(not(target_os = "linux"))]
+    #[cfg(not(unix))]
     fn handle_symlink_during_recursion(&self, path: &Path) -> UResult<()> {
         // Use the common symlink handling logic
         self.handle_symlink_during_traversal(path, false)

src/uu/cp/src/cp.rs

@@ -1566,6 +1566,7 @@ fn file_mode_for_interactive_overwrite(
             match path.metadata() {
                 Ok(me) => {
                     // Cast is necessary on some platforms
+                    #[allow(clippy::unnecessary_cast)]
                     let mode: mode_t = me.mode() as mode_t;
 
                     // It looks like this extra information is added to the prompt iff the file's user write bit is 0
@@ -1758,7 +1759,7 @@ pub(crate) fn copy_attributes(
         Ok(())
     })?;
 
-    #[cfg(feature = "selinux")]
+    #[cfg(all(feature = "selinux", target_os = "linux"))]
     handle_preserve(&attributes.context, || -> CopyResult<()> {
         // Get the source context and apply it to the destination
         if let Ok(context) = selinux::SecurityContext::of_path(source, false, false) {
@@ -2552,7 +2553,7 @@ fn copy_file(
         copy_attributes(source, dest, &options.attributes)?;
     }
 
-    #[cfg(feature = "selinux")]
+    #[cfg(all(feature = "selinux", target_os = "linux"))]
     if options.set_selinux_context && uucore::selinux::is_selinux_enabled() {
         // Set the given selinux permissions on the copied file.
         if let Err(e) =
@@ -2620,8 +2621,10 @@ fn handle_no_preserve_mode(options: &Options, org_mode: u32) -> u32 {
             target_os = "redox",
         ))]
         {
+            #[allow(clippy::unnecessary_cast)]
             const MODE_RW_UGO: u32 =
                 (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH) as u32;
+            #[allow(clippy::unnecessary_cast)]
             const S_IRWXUGO: u32 = (S_IRWXU | S_IRWXG | S_IRWXO) as u32;
             return if is_explicit_no_preserve_mode {
                 MODE_RW_UGO

src/uu/du/Cargo.toml

@@ -27,11 +27,13 @@ uucore = { workspace = true, features = [
   "parser-size",
   "parser-glob",
   "time",
-  "safe-traversal",
 ] }
 thiserror = { workspace = true }
 fluent = { workspace = true }
 
+[target.'cfg(all(unix, not(target_os = "redox")))'.dependencies]
+uucore = { workspace = true, features = ["safe-traversal"] }
+
 [target.'cfg(target_os = "windows")'.dependencies]
 windows-sys = { workspace = true, features = [
   "Win32_Storage_FileSystem",

src/uu/du/src/du.rs

@@ -25,7 +25,7 @@ use uucore::display::{Quotable, print_verbatim};
 use uucore::error::{FromIo, UError, UResult, USimpleError, set_exit_code};
 use uucore::fsext::{MetadataTimeField, metadata_get_time};
 use uucore::line_ending::LineEnding;
-#[cfg(target_os = "linux")]
+#[cfg(all(unix, not(target_os = "redox")))]
 use uucore::safe_traversal::DirFd;
 use uucore::translate;
 
@@ -164,7 +164,7 @@ impl Stat {
     }
 
     /// Create a Stat using safe traversal methods with `DirFd` for the root directory
-    #[cfg(target_os = "linux")]
+    #[cfg(all(unix, not(target_os = "redox")))]
     fn new_from_dirfd(dir_fd: &DirFd, full_path: &Path) -> std::io::Result<Self> {
         // Get metadata for the directory itself using fstat
         let safe_metadata = dir_fd.metadata()?;
@@ -293,9 +293,9 @@ fn read_block_size(s: Option<&str>) -> UResult<u64> {
     }
 }
 
-#[cfg(target_os = "linux")]
-// For now, implement safe_du only on Linux
-// This is done for Ubuntu but should be extended to other platforms that support openat
+#[cfg(all(unix, not(target_os = "redox")))]
+// Implement safe_du on Unix (except Redox which lacks full stat support)
+// This is done for TOCTOU safety
 fn safe_du(
     path: &Path,
     options: &TraversalOptions,
@@ -439,7 +439,8 @@ fn safe_du(
         const S_IFMT: u32 = 0o170_000;
         const S_IFDIR: u32 = 0o040_000;
         const S_IFLNK: u32 = 0o120_000;
-        let is_symlink = (lstat.st_mode & S_IFMT) == S_IFLNK;
+        #[allow(clippy::unnecessary_cast)]
+        let is_symlink = (lstat.st_mode as u32 & S_IFMT) == S_IFLNK;
 
         // Handle symlinks with -L option
         // For safe traversal with -L, we skip symlinks to directories entirely
@@ -450,12 +451,14 @@ fn safe_du(
             continue;
         }
 
-        let is_dir = (lstat.st_mode & S_IFMT) == S_IFDIR;
+        #[allow(clippy::unnecessary_cast)]
+        let is_dir = (lstat.st_mode as u32 & S_IFMT) == S_IFDIR;
         let entry_stat = lstat;
 
+        #[allow(clippy::unnecessary_cast)]
         let file_info = (entry_stat.st_ino != 0).then_some(FileInfo {
             file_id: entry_stat.st_ino as u128,
-            dev_id: entry_stat.st_dev,
+            dev_id: entry_stat.st_dev as u64,
         });
 
         // For safe traversal, we need to handle stats differently
@@ -465,6 +468,7 @@ fn safe_du(
             Stat {
                 path: entry_path.clone(),
                 size: 0,
+                #[allow(clippy::unnecessary_cast)]
                 blocks: entry_stat.st_blocks as u64,
                 inodes: 1,
                 inode: file_info,
@@ -476,7 +480,9 @@ fn safe_du(
             // For files
             Stat {
                 path: entry_path.clone(),
+                #[allow(clippy::unnecessary_cast)]
                 size: entry_stat.st_size as u64,
+                #[allow(clippy::unnecessary_cast)]
                 blocks: entry_stat.st_blocks as u64,
                 inodes: 1,
                 inode: file_info,
@@ -1096,14 +1102,14 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         let mut seen_inodes: HashSet<FileInfo> = HashSet::new();
 
         // Determine which traversal method to use
-        #[cfg(target_os = "linux")]
+        #[cfg(all(unix, not(target_os = "redox")))]
         let use_safe_traversal = traversal_options.dereference != Deref::All;
-        #[cfg(not(target_os = "linux"))]
+        #[cfg(not(all(unix, not(target_os = "redox"))))]
         let use_safe_traversal = false;
 
         if use_safe_traversal {
-            // Use safe traversal (Linux only, when not using -L)
-            #[cfg(target_os = "linux")]
+            // Use safe traversal (Unix except Redox, when not using -L)
+            #[cfg(all(unix, not(target_os = "redox")))]
             {
                 // Pre-populate seen_inodes with the starting directory to detect cycles
                 if let Ok(stat) = Stat::new(&path, None, &traversal_options) {
@@ -1158,9 +1164,9 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                     .send(Ok(StatPrintInfo { stat, depth: 0 }))
                     .map_err(|e| USimpleError::new(1, e.to_string()))?;
             } else {
-                #[cfg(target_os = "linux")]
+                #[cfg(unix)]
                 let error_msg = translate!("du-error-cannot-access", "path" => path.quote());
-                #[cfg(not(target_os = "linux"))]
+                #[cfg(not(unix))]
                 let error_msg =
                     translate!("du-error-cannot-access-no-such-file", "path" => path.quote());
 

src/uu/id/src/id.rs

@@ -62,9 +62,9 @@ macro_rules! cstr2cow {
 }
 
 fn get_context_help_text() -> String {
-    #[cfg(not(feature = "selinux"))]
+    #[cfg(not(all(feature = "selinux", target_os = "linux")))]
     return translate!("id-context-help-disabled");
-    #[cfg(feature = "selinux")]
+    #[cfg(all(feature = "selinux", target_os = "linux"))]
     return translate!("id-context-help-enabled");
 }
 
@@ -137,11 +137,11 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         cflag: matches.get_flag(options::OPT_CONTEXT),
 
         selinux_supported: {
-            #[cfg(feature = "selinux")]
+            #[cfg(all(feature = "selinux", target_os = "linux"))]
             {
                 uucore::selinux::is_selinux_enabled()
             }
-            #[cfg(not(feature = "selinux"))]
+            #[cfg(not(all(feature = "selinux", target_os = "linux")))]
             {
                 false
             }