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+/** @file
+ Base Stack Check library for GCC/clang.
+
+ Use -fstack-protector-all compiler flag to make the compiler insert
+ the __stack_chk_guard "canary" value into the stack and check the
+ value prior to exiting the function. If the "canary" is overwritten
+ __stack_chk_fail() is called. This is GCC specific code.
+
+ Copyright (c) 2012, Apple Inc. All rights reserved.<BR> This program
+ and the accompanying materials are licensed and made available under
+ the terms and conditions of the BSD License which accompanies this
+ distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Base.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+
+VOID
+__stack_chk_fail (
+ VOID
+ );
+
+
+/// "canary" value that is inserted by the compiler into the stack frame.
+VOID *__stack_chk_guard = (VOID*)0x0AFF;
+
+// If ASLR was enabled we could use
+//void (*__stack_chk_guard)(void) = __stack_chk_fail;
+
+/**
+ Error path for compiler generated stack "canary" value check code. If
+the stack canary has been overwritten this function gets called on
+exit of the function.
+**/
+VOID
+__stack_chk_fail (
+ VOID
+ )
+{
+ UINT8 DebugPropertyMask;
+
+ DEBUG ((DEBUG_ERROR, "STACK FAULT: Buffer Overflow in function
+ %a.\n", __builtin_return_address(0)));
+
+ //
+ // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings even
+if
+ // BaseDebugLibNull is in use.
+ //
+ DebugPropertyMask = PcdGet8 (PcdDebugPropertyMask);
+ if ((DebugPropertyMask & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {
+ CpuBreakpoint ();
+ } else if ((DebugPropertyMask & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {
+ CpuDeadLoop ();
+ }
+}
+
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+## @file
+# Stack Check Library
+#
+# Copyright (c) 2014, ARM Ltd. All rights reserved.<BR> # # This
+program and the accompanying materials # are licensed and made
+available under the terms and conditions of the BSD License # which
+accompanies this distribution. The full text of the license may be
+found at # http://opensource.org/licenses/bsd-license.php.
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
+BASIS, # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = BaseStackCheckLib
+ FILE_GUID = 5f6579f7-b648-4fdb-9f19-4c17e27e8eff
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = BaseStackCheckLib
+
+
+#
+# VALID_ARCHITECTURES = ARM AARCH64
+#
+
+[Sources]
+ BaseStackCheckGcc.c | GCC
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ BaseLib
+ DebugLib
+
+[Pcd]
+ gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask
+
--
1.8.5