1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/compiler_stack_protect.c b/kernel/compiler_stack_protect.c
new file mode 100644
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+++ b/kernel/compiler_stack_protect.c
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+/*
+ * Copyright (c) 2012-2014 Wind River Systems, Inc.
+ *
+ * Licensed 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.
+ */
+
+/**
+ * @file
+ * @brief Compiler stack protection (kernel part)
+ *
+ * This module provides functions to support compiler stack protection
+ * using canaries.  This feature is enabled with configuration
+ * CONFIG_STACK_CANARIES=y.
+ *
+ * When this feature is enabled, the compiler generated code refers to
+ * function __stack_chk_fail and global variable __stack_chk_guard.
+ */
+
+#include <toolchain.h> /* compiler specific configurations */
+
+#include <kernel_structs.h>
+#include <toolchain.h>
+#include <sections.h>
+
+/**
+ *
+ * @brief Stack canary error handler
+ *
+ * This function is invoked when a stack canary error is detected.
+ *
+ * @return Does not return
+ */
+void FUNC_NORETURN _StackCheckHandler(void)
+{
+	/* Stack canary error is a software fatal condition; treat it as such.
+	 */
+
+	_NanoFatalErrorHandler(_NANO_ERR_STACK_CHK_FAIL, &_default_esf);
+}
+
+/* Global variable */
+
+/*
+ * Symbol referenced by GCC compiler generated code for canary value.
+ * The canary value gets initialized in _Cstart().
+ */
+void __noinit *__stack_chk_guard;
+
+/**
+ *
+ * @brief Referenced by GCC compiler generated code
+ *
+ * This routine is invoked when a stack canary error is detected, indicating
+ * a buffer overflow or stack corruption problem.
+ */
+FUNC_ALIAS(_StackCheckHandler, __stack_chk_fail, void);