From 7b9dd97689db400f2408ed50b04857d7d73d83e5 Mon Sep 17 00:00:00 2001
From: Agando <roduccomm@gmail.com>
Date: Tue, 29 Sep 2026 15:56:27 +0200
Subject: newOS4 v4.6.15: reentrant print-capture stack, AI tail -f block,
 read-only sed in safeRead, security test harness (21 checks)

---
 modules/ext/shell.js | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

(limited to 'modules/ext/shell.js')

diff --git a/modules/ext/shell.js b/modules/ext/shell.js
index 80bc841..9966e0f 100644
--- a/modules/ext/shell.js
+++ b/modules/ext/shell.js
@@ -366,9 +366,8 @@ class ShellModule {
         }
 
         // > or >> — capture output, write to file
-        const originalPrint = this.terminal.print.bind(this.terminal);
         let output = '';
-        this.terminal.print = (text, type) => { output += text + '\n'; };
+        this.terminal._pushPrintCapture(buf => { output += buf; });
         let cmdOk = true;
 
         try {
@@ -386,13 +385,12 @@ class ShellModule {
                         fs.writeFile('__pipebuf__', pipeInput);
                     }
                     if (i < pipeParts.length - 1) {
-                        const captPrint = this.terminal.print.bind(this.terminal);
                         let capt = '';
-                        this.terminal.print = (t, ty) => { capt += t + '\n'; };
+                        this.terminal._pushPrintCapture(buf => { capt += buf; });
                         try {
                             await this.terminal.dispatchCommand(pCmd, pArgs);
                         } finally {
-                            this.terminal.print = captPrint;
+                            this.terminal._popPrintCapture();
                         }
                         pipeInput = capt.trim();
                     } else {
@@ -410,14 +408,18 @@ class ShellModule {
             }
         } catch(e) {
             cmdOk = false;
-            // Restore print before showing the error
-            this.terminal.print = originalPrint;
+            // Pop capture before showing the error
+            this.terminal._popPrintCapture();
             this.terminal.print('Error: ' + e.message, 'error');
             redirectInfo.exitOk = false;
             return;
         } finally {
-            // Always restore print — critical: without this, terminal is permanently broken
-            this.terminal.print = originalPrint;
+            // Always pop capture — critical: without this, terminal output stays captured
+            // (empty stack = normal DOM printing, so pop is idempotent-safe when already popped)
+            if (this.terminal._printCaptureStack && this.terminal._printCaptureStack.length > 0) {
+                // popped in catch path for error case; success path pops here
+                this.terminal._popPrintCapture();
+            }
         }
 
         const captured = output.trimEnd();
-- 
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