Protection against stack-based memory corruption errors using SafeStack: compiler-rt runtime support library

This patch adds runtime support for the Safe Stack protection to compiler-rt
(see http://reviews.llvm.org/D6094 for the detailed description of the
Safe Stack).

This patch is our implementation of the safe stack on top of compiler-rt. The
patch adds basic runtime support for the safe stack to compiler-rt that
manages unsafe stack allocation/deallocation for each thread.

Original patch by Volodymyr Kuznetsov and others at the Dependable Systems
Lab at EPFL; updates and upstreaming by myself.

Differential Revision: http://reviews.llvm.org/D6096

llvm-svn: 239763

1 files changed, 28 insertions, 0 deletions

diff --git a/compiler-rt/lib/safestack/CMakeLists.txt b/compiler-rt/lib/safestack/CMakeLists.txt
new file mode 100644
index 00000000000..1c15d079dbb
--- /dev/null
+++ b/compiler-rt/lib/safestack/CMakeLists.txt
@@ -0,0 +1,28 @@
+add_custom_target(safestack)
+
+set(SAFESTACK_SOURCES safestack.cc)
+
+include_directories(..)
+
+set(SAFESTACK_CFLAGS ${SANITIZER_COMMON_CFLAGS})
+
+if(APPLE)
+  # Build universal binary on APPLE.
+  add_compiler_rt_osx_static_runtime(clang_rt.safestack_osx
+    ARCH ${SAFESTACK_SUPPORTED_ARCH}
+    SOURCES ${SAFESTACK_SOURCES}
+            $<TARGET_OBJECTS:RTInterception.osx>
+            $<TARGET_OBJECTS:RTSanitizerCommon.osx>
+    CFLAGS ${SAFESTACK_CFLAGS})
+  add_dependencies(safestack clang_rt.safestack_osx)
+else()
+  # Otherwise, build separate libraries for each target.
+  foreach(arch ${SAFESTACK_SUPPORTED_ARCH})
+    add_compiler_rt_runtime(clang_rt.safestack-${arch} ${arch} STATIC
+      SOURCES ${SAFESTACK_SOURCES}
+              $<TARGET_OBJECTS:RTInterception.${arch}>
+              $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
+      CFLAGS ${SAFESTACK_CFLAGS})
+    add_dependencies(safestack clang_rt.safestack-${arch})
+  endforeach()
+endif()