[GitHub] [mynewt-core] t3zeng commented on a change in pull request #2716: util: Add sensitive data mynewt util to hide data in coredumps

[GitBox <gi...@apache.org>]

t3zeng commented on a change in pull request #2716:
URL: https://github.com/apache/mynewt-core/pull/2716#discussion_r744953652



##########
File path: util/memprotect/src/memprotect.c
##########
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+#include "os/mynewt.h"
+#include "memprotect/memprotect.h"
+
+extern int __mynewt_protected_start, __mynewt_protected_end;
+
+/**
+ * Clear out sensitive memory area
+ */
+void
+memprotect_clear_data(void)
+{
+    uint32_t * ptr = (uint32_t *) &__mynewt_protected_start, idx;
+
+    for (idx = 0; i < (uint32_t *) &__mynewt_protected_end; idx+= sizeof(* ptr)) {
+        ptr[idx] = MYNEWT_VAL(MEMPROTECT_PATTERN);

Review comment:
       `MEMPROTECT_PATTERN` is in `util/memprotect/syscfg.yml`




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