Add Test Validating Stack is not Executable in playTests.sh

tests/playTests.sh

@@ -304,6 +304,15 @@ zstd -d -f tmp_corrupt.zst --no-check
 zstd -d -f tmp_corrupt.zst --check --no-check # final flag overrides
 zstd -d -f tmp.zst --no-check
 
+if [ "$isWindows" = false ]; then
+  if [ -n "$(which readelf)" ]; then
+    println "test: check if binary has executable stack"
+    file "$ZSTD_BIN"
+    readelf -lW "$ZSTD_BIN"
+    readelf -lW "$ZSTD_BIN" | grep 'GNU_STACK .* RW ' || die "zstd binary has executable stack!"
+  fi
+fi
+
 println "\n===> zstdgrep tests"
 ln -sf "$ZSTD_BIN" zstdcat
 rm -f tmp_grep