Arm backend: Add support for asan in executor_runner

A lightweight AddressSanitizer runtime tailored for the ExecuTorch
bare metal examples. The goal is to provide basic memory safety
diagnostics while keeping the runtime self-contained.

This uses the kernel asan so it is not full asan.

Signed-off-by: per.held@arm.com
Change-Id: I7ca5a6d39450b13ed461f0d1b91e1f17ab69a42e

Author: perheld

backends/arm/scripts/build_executorch.sh

@@ -5,7 +5,7 @@
 # LICENSE file in the root directory of this source tree.
 
 # Optional parameter:
-# --build_type= "Release" | "Debug" | "RelWithDebInfo" | "UndefinedSanitizer"
+# --build_type= "Release" | "Debug" | "RelWithDebInfo" | "UndefinedSanitizer" | "AddressSanitizer"
 # --etdump      build with devtools-etdump support
 
 set -eu
@@ -28,7 +28,7 @@ help() {
     echo "Usage: $(basename $0) [options]"
     echo "Options:"
     echo "  --et_build_root=<FOLDER>  Build output root folder to use, defaults to ${et_build_root}"
-    echo "  --build_type=<TYPE>       Build with Release, Debug, RelWithDebInfo or UndefinedSanitizer, default is ${build_type}"
+    echo "  --build_type=<TYPE>       Build with Release, Debug, RelWithDebInfo, UndefinedSanitizer or AddressSanitizer, default is ${build_type}"
     echo "  --devtools                Build Devtools libs"
     echo "  --etdump                  Adds Devtools etdump support to track timing, etdump area will be base64 encoded in the log"
     echo "  --toolchain=<TOOLCHAIN>   Toolchain can be specified (e.g. bare metal as arm-none-eabi-gcc or zephyr as arm-zephyr-eabi-gcc Default: ${toolchain}"

backends/arm/test/test_arm_baremetal.sh

@@ -404,4 +404,15 @@ test_undefinedbehavior_sanitizer() {
     echo "${TEST_SUITE_NAME}: PASS"
 }
 
+test_address_sanitizer() {
+    echo "${TEST_SUITE_NAME}: Test ethos-u executor_runner with ASAN"
+
+    mkdir -p arm_test/test_run
+    # Ethos-U85
+    echo "${TEST_SUITE_NAME}: Test target Ethos-U85"
+    examples/arm/run.sh --et_build_root=arm_test/test_run --target=ethos-u85-128 --model_name=examples/arm/example_modules/add.py --build_type=AddressSanitizer
+    echo "${TEST_SUITE_NAME}: PASS"
+}
+
+
 ${TEST_SUITE}

examples/arm/asan/CMakeLists.txt

@@ -0,0 +1,21 @@
+# Copyright 2025 Arm Limited and/or its affiliates.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+add_library(executorch_asan STATIC asan_runtime.c)
+
+target_compile_features(executorch_asan PRIVATE c_std_11)
+
+target_compile_options(
+  executorch_asan PRIVATE -fno-sanitize=address -fno-sanitize=kernel-address
+                          -fno-sanitize=undefined
+)
+
+set_target_properties(executorch_asan PROPERTIES OUTPUT_NAME "asan")
+
+install(
+  TARGETS executorch_asan
+  EXPORT ExecuTorchTargets
+  ARCHIVE DESTINATION lib
+)