Adding shmbridge validation test case

This test validates the encryption and access functionality of the shmbridge
partition by formatting it, applying fscrypt encryption, and verifying data
integrity through read/write operations.

- Compliant with qcom-linux-testkit structure
- Generates .res file for CI/CD
- Uses functestlib logging and dependency checks

Signed-off-by: Anil Yadav <[email protected]>

Author: qcom-anilyada

Runner/suites/Kernel/FunctionalArea/baseport/shmbridge/README.md

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+Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+SPDX-License-Identifier: BSD-3-Clause-Clear
+
+# shmbridge Validation Test
+
+## Overview
+
+This test case validates the encryption and access functionality of the `shmbridge` partition by:
+
+- Formatting the partition with ext4 and encryption options
+- Mounting it with `inlinecrypt`
+- Adding an encryption key using `fscryptctl`
+- Setting and verifying an encryption policy
+- Writing and reading a test file to confirm data integrity
+
+## Usage
+
+Instructions:
+
+1. Copy repo to Target Device: Use scp to transfer the scripts from the host to the target device. The scripts should be copied to any directory on the target device.
+2. Verify Transfer: Ensure that the repo have been successfully copied to any directory on the target device.
+3. Run Scripts: Navigate to the directory where these files are copied on the target device and execute the scripts as needed.
+
+Run a Kernel Baseport shmbridge test using:
+---
+#### Quick Example
+```
+git clone <this-repo>
+cd <this-repo>
+scp -r common Runner user@target_device_ip:<Path in device>
+ssh user@target_device_ip
+cd <Path in device>/Runner && ./run-test.sh shmbridge
+```
+
+## Prerequisites
+- `fscryptctl`, `mkfs.ext4` and `mount` must be available
+- Root access is required
+- Partition /dev/disk/by-partlabel/xbl_ramdump_a must exist and be accessible
+
+## Result Format
+
+Test result will be saved in shmbridge.res as:  
+#### Pass Criteria
+- Partition is found and formatted
+- Encryption key is added and policy is set
+- Test file is written and read successfully
+- `Test Passed` – if all validations succeed
+<!-- -->
+#### Fail Criteria
+- Partition not found
+- Encryption setup fails
+- Test file cannot be read or content mismatch
+- `Test Failed` – if any check fails
+
+## Output
+A .res file is generated in the same directory:
+
+`PASS shmbridge`  OR   `FAIL shmbridge`
+

Runner/suites/Kernel/FunctionalArea/baseport/shmbridge/run.sh

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+#!/bin/sh
+
+# Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+
+# Source init_env and functestlib.sh
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+INIT_ENV=""
+SEARCH="$SCRIPT_DIR"
+while [ "$SEARCH" != "/" ]; do
+    if [ -f "$SEARCH/init_env" ]; then
+        INIT_ENV="$SEARCH/init_env"
+        break
+    fi
+    SEARCH=$(dirname "$SEARCH")
+done
+
+if [ -z "$INIT_ENV" ]; then
+    echo "[ERROR] Could not find init_env (starting at $SCRIPT_DIR)" >&2
+    exit 1
+fi
+
+# shellcheck disable=SC1090
+. "$INIT_ENV"
+
+# shellcheck disable=SC1090,SC1091
+. "$TOOLS/functestlib.sh"
+
+TESTNAME="shmbridge"
+test_path=$(find_test_case_by_name "$TESTNAME") || {
+    log_fail "$TESTNAME : Test directory not found."
+    echo "FAIL $TESTNAME" > "./$TESTNAME.res"
+    exit 1
+}
+
+cd "$test_path" || exit 1
+res_file="./$TESTNAME.res"
+rm -f "$res_file"
+
+log_info "--------------------------------------------------------------------------"
+log_info "-------------------Starting $TESTNAME Testcase----------------------------"
+
+log_info "Checking if dependency: fscryptctl mkfs.ext4 mount is available"
+check_dependencies fscryptctl mkfs.ext4 mount 
+
+MOUNT_POINT="/mnt/overlay"
+PARTITION="/dev/disk/by-partlabel/xbl_ramdump_a"
+KEY_FILE="$MOUNT_POINT/stdkey"
+TEST_DIR="$MOUNT_POINT/test"
+TEST_FILE="$TEST_DIR/txt"
+
+log_info "Creating mount point at $MOUNT_POINT"
+mkdir -p "$MOUNT_POINT"
+
+log_info "Checking if partition exists"
+if [ ! -e "$PARTITION" ]; then
+    log_fail "Partition $PARTITION not found"
+    echo "FAIL $TESTNAME" > "$res_file"
+    exit 1
+fi
+
+log_info "Formatting partition with ext4 and encryption options"
+if ! mount | grep -q "$PARTITION"; then
+    mkfs.ext4 -F -O encrypt,stable_inodes "$PARTITION"
+else
+    log_warn "$PARTITION is already mounted; skipping format"
+fi
+
+log_info "Mounting partition to $MOUNT_POINT with inlinecrypt"
+mount "$PARTITION" -o inlinecrypt "$MOUNT_POINT"
+
+log_info "Generating 64-byte encryption key"
+dd if=/dev/urandom bs=1 count=64 > "$KEY_FILE"
+
+log_info "Adding encryption key using fscryptctl"
+identifier=$(fscryptctl add_key "$MOUNT_POINT" < "$KEY_FILE")
+
+mkdir -p "$TEST_DIR"
+
+log_info "Setting encryption policy on $TEST_DIR"
+fscryptctl set_policy --iv-ino-lblk-64 "$identifier" "$TEST_DIR"
+
+log_info "Verifying encryption policy"
+fscryptctl get_policy "$TEST_DIR"
+
+log_info "Writing test file"
+echo "hello" > "$TEST_FILE"
+sync
+echo 3 > /proc/sys/vm/drop_caches
+
+log_info "Reading test file"
+if cat "$TEST_FILE" | grep -q "hello"; then
+    log_pass "$TESTNAME : Test Passed"
+    echo "PASS $TESTNAME" > "$res_file"
+else
+    log_fail "$TESTNAME : Test Failed"
+    echo "FAIL $TESTNAME" > "$res_file"
+    exit 1
+fi
+
+log_info "-------------------Completed $TESTNAME Testcase----------------------------"
+
+