From 5e5fb41538a0dcb8f425b81e8ce7ad6356d2988a Mon Sep 17 00:00:00 2001
From: Andrew Fish <afish@apple.com>
Date: Wed, 20 Aug 2014 18:00:38 +0000
Subject: MdePkg: Introduced BaseStackCheckLib (cont.)

This library only support GCC, RVCT and XCode for now.
The new files were missing from SVN rev15851.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Andrew Fish <afish@apple.com>
Signed-off-by: Olivier Martin <olivier.martin@arm.com
Reviewed-by: Gao, Liming <liming.gao@intel.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15852 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../Library/BaseStackCheckLib/BaseStackCheckGcc.c  | 55 ++++++++++++++++++++++
 .../BaseStackCheckLib/BaseStackCheckLib.inf        | 42 +++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 MdePkg/Library/BaseStackCheckLib/BaseStackCheckGcc.c
 create mode 100644 MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf

(limited to 'MdePkg')

diff --git a/MdePkg/Library/BaseStackCheckLib/BaseStackCheckGcc.c b/MdePkg/Library/BaseStackCheckLib/BaseStackCheckGcc.c
new file mode 100644
index 0000000..ecf77f0
--- /dev/null
+++ b/MdePkg/Library/BaseStackCheckLib/BaseStackCheckGcc.c
@@ -0,0 +1,55 @@
+/** @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>
+
+/// "canary" value that is inserted by the compiler into the stack frame.
+VOID *__stack_chk_guard = (VOID*)FixedPcdGet64 (PcdBaseStackCanary);
+
+// 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 ();
+  }
+}
diff --git a/MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf b/MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
new file mode 100644
index 0000000..3304284
--- /dev/null
+++ b/MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
@@ -0,0 +1,42 @@
+## @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                  = NULL
+
+
+#
+#  VALID_ARCHITECTURES           = ARM AARCH64
+#
+
+[Sources]
+  BaseStackCheckGcc.c | GCC
+  BaseStackCheckGcc.c | RVCT
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+
+[FixedPcd]
+  gEfiMdePkgTokenSpaceGuid.PcdBaseStackCanary
+  gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask
-- 
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