fix: enhance uninstall security per audit review

- Validate bundle_id format (reverse-DNS) in stop_launch_services() to prevent glob injection attacks
    - Add common word exclusion list for LaunchAgents name search to avoid false positive matches (Music, Notes, Photos, etc.) - Add security comments explaining symlink handling in remove_file_list()
    - Improve brew_uninstall_cask() timeout handling: exit code 124 now returns failure immediately
    - Update SECURITY_AUDIT.md with remediation details

lib/core/app_protection.sh

@@ -768,14 +768,23 @@ find_app_files() {
     # Note: LaunchDaemons are system-level and handled in find_app_system_files()
     # Minimum 5-char threshold prevents false positives (e.g., "Time" matching system agents)
     # Short-name apps (e.g., Zoom, Arc) are still cleaned via bundle_id matching above
+    # Security: Common words are excluded to prevent matching unrelated plist files
     if [[ ${#app_name} -ge 5 ]] && [[ -d ~/Library/LaunchAgents ]]; then
-        while IFS= read -r -d '' plist; do
-            local plist_name=$(basename "$plist")
-            if [[ "$plist_name" =~ ^com\.apple\. ]]; then
-                continue
-            fi
-            files_to_clean+=("$plist")
-        done < <(command find ~/Library/LaunchAgents -maxdepth 1 -name "*$app_name*.plist" -print0 2> /dev/null)
+        # Skip common words that could match many unrelated LaunchAgents
+        # These are either generic terms or names that overlap with system/common utilities
+        local common_words="Music|Notes|Photos|Finder|Safari|Preview|Calendar|Contacts|Messages|Reminders|Clock|Weather|Stocks|Books|News|Podcasts|Voice|Files|Store|System|Helper|Agent|Daemon|Service|Update|Sync|Backup|Cloud|Manager|Monitor|Server|Client|Worker|Runner|Launcher|Driver|Plugin|Extension|Widget|Utility"
+        if [[ "$app_name" =~ ^($common_words)$ ]]; then
+            debug_log "Skipping LaunchAgent name search for common word: $app_name"
+        else
+            while IFS= read -r -d '' plist; do
+                local plist_name=$(basename "$plist")
+                # Skip Apple's LaunchAgents
+                if [[ "$plist_name" =~ ^com\.apple\. ]]; then
+                    continue
+                fi
+                files_to_clean+=("$plist")
+            done < <(command find ~/Library/LaunchAgents -maxdepth 1 -name "*$app_name*.plist" -print0 2> /dev/null)
+        fi
     fi
 
     # Handle specialized toolchains and development environments

lib/uninstall/batch.sh

@@ -72,12 +72,20 @@ decode_file_list() {
 # Note: find_app_files() and calculate_total_size() are in lib/core/common.sh.
 
 # Stop Launch Agents/Daemons for an app.
+# Security: bundle_id is validated to be reverse-DNS format before use in find patterns
 stop_launch_services() {
     local bundle_id="$1"
     local has_system_files="${2:-false}"
 
     [[ -z "$bundle_id" || "$bundle_id" == "unknown" ]] && return 0
 
+    # Validate bundle_id format: must be reverse-DNS style (e.g., com.example.app)
+    # This prevents glob injection attacks if bundle_id contains special characters
+    if [[ ! "$bundle_id" =~ ^[a-zA-Z0-9][-a-zA-Z0-9]*(\.[a-zA-Z0-9][-a-zA-Z0-9]*)+$ ]]; then
+        debug_log "Invalid bundle_id format for LaunchAgent search: $bundle_id"
+        return 0
+    fi
+
     if [[ -d ~/Library/LaunchAgents ]]; then
         while IFS= read -r -d '' plist; do
             launchctl unload "$plist" 2> /dev/null || true
@@ -135,6 +143,7 @@ remove_login_item() {
 }
 
 # Remove files (handles symlinks, optional sudo).
+# Security: All paths pass validate_path_for_deletion() before any deletion.
 remove_file_list() {
     local file_list="$1"
     local use_sudo="${2:-false}"
@@ -147,6 +156,12 @@ remove_file_list() {
             continue
         fi
 
+        # Symlinks are handled separately using rm (not safe_remove/safe_sudo_remove)
+        # because safe_sudo_remove() refuses symlinks entirely as a TOCTOU protection.
+        # This is safe because:
+        # 1. The path has already passed validate_path_for_deletion() above
+        # 2. rm on a symlink only removes the link itself, NOT the target
+        # 3. The symlink deletion is logged via operations.log
         if [[ -L "$file" ]]; then
             if [[ "$use_sudo" == "true" ]]; then
                 sudo rm "$file" 2> /dev/null && ((++count)) || true

lib/uninstall/brew.sh

@@ -196,15 +196,22 @@ brew_uninstall_cask() {
     fi
 
     # Run with timeout to prevent hangs from problematic cask scripts
+    local brew_exit=0
     if HOMEBREW_NO_ENV_HINTS=1 HOMEBREW_NO_AUTO_UPDATE=1 NONINTERACTIVE=1 \
         run_with_timeout "$timeout" brew uninstall --cask "$cask_name" 2>&1; then
         uninstall_ok=true
     else
         brew_exit=$?
         debug_log "brew uninstall timeout or failed with exit code: $brew_exit"
+        # Exit code 124 indicates timeout from run_with_timeout
+        # On timeout, fail immediately without verification to avoid inconsistent state
+        if [[ $brew_exit -eq 124 ]]; then
+            debug_log "brew uninstall timed out after ${timeout}s, returning failure"
+            return 1
+        fi
     fi
 
-    # Verify removal
+    # Verify removal (only if not timed out)
     local cask_gone=true app_gone=true
     HOMEBREW_NO_ENV_HINTS=1 brew list --cask 2> /dev/null | grep -qxF "$cask_name" && cask_gone=false
     [[ -n "$app_path" && -e "$app_path" ]] && app_gone=false