Add GNU-stack annotation to Android code.

Change-Id: I3554e76370446fe42a2624114b9c8e1d8a3cec28

9 files changed, 59 insertions, 0 deletions

diff --git a/gcc-4.2.1/README.android b/gcc-4.2.1/README.android
index 710653899..ebaa4d75f 100644
--- a/gcc-4.2.1/README.android
+++ b/gcc-4.2.1/README.android
@@ -2,6 +2,25 @@ This is a modified version of gcc-4.2.1 for Android. It is based on a Google
 customized gcc-4.2.1.  The Google specific changes are documented in 
 README.google.  In addition, this gcc also contains the following changes.
 
+2010-04-29  Jing Yu  <jingyu@google.com>
+
+	Add GNU-stack to generated code to enhance security. Port from
+	http://gcc.gnu.org/ml/gcc-patches/2006-11/msg00119.html
+	and also add a local patch which enforces eabi target to include
+	the GNU-stack annotation.
+
+	Changed Files:
+
+	gcc/config/arm/linux-elf.h
+	gcc/config/arm/arm.c
+	gcc/config/arm/arm.h
+	gcc/config/arm/lib1funcs.asm
+	gcc/config/arm/crti.asm
+	gcc/config/arm/crtn.asm
+	gcc/config/arm/libunwind.S
+	gcc/config/arm/eabi.h
+
+
 2009-03-19  Doug Kwan  <dougkwan@google.com>
 
 	Fix two bugs that caused different code to be generated on Linux
diff --git a/gcc-4.2.1/gcc/config/arm/arm.c b/gcc-4.2.1/gcc/config/arm/arm.c
index aee29b630..ec34cb208 100644
--- a/gcc-4.2.1/gcc/config/arm/arm.c
+++ b/gcc-4.2.1/gcc/config/arm/arm.c
@@ -14468,6 +14468,10 @@ arm_file_end (void)
 {
   int regno;
 
+  if (NEED_INDICATE_EXEC_STACK)
+    /* Add .note.GNU-stack.  */
+    file_end_indicate_exec_stack ();
+
   if (! thumb_call_reg_needed)
     return;
 
diff --git a/gcc-4.2.1/gcc/config/arm/arm.h b/gcc-4.2.1/gcc/config/arm/arm.h
index 784142cfb..d4cb3d686 100644
--- a/gcc-4.2.1/gcc/config/arm/arm.h
+++ b/gcc-4.2.1/gcc/config/arm/arm.h
@@ -2595,4 +2595,10 @@ enum arm_builtins
 
   ARM_BUILTIN_MAX
 };
+
+/* Do not emit .note.GNU-stack by default.  */
+#ifndef NEED_INDICATE_EXEC_STACK
+#define NEED_INDICATE_EXEC_STACK        0
+#endif
+
 #endif /* ! GCC_ARM_H */
diff --git a/gcc-4.2.1/gcc/config/arm/crti.asm b/gcc-4.2.1/gcc/config/arm/crti.asm
index 166a3ce34..abacdd1e3 100644
--- a/gcc-4.2.1/gcc/config/arm/crti.asm
+++ b/gcc-4.2.1/gcc/config/arm/crti.asm
@@ -30,6 +30,11 @@
 #    This exception does not however invalidate any other reasons why
 #    the executable file might be covered by the GNU General Public License.
 # 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
 
 # This file just make a stack frame for the contents of the .fini and
 # .init sections.  Users may put any desired instructions in those
diff --git a/gcc-4.2.1/gcc/config/arm/crtn.asm b/gcc-4.2.1/gcc/config/arm/crtn.asm
index 360afae97..84facb933 100644
--- a/gcc-4.2.1/gcc/config/arm/crtn.asm
+++ b/gcc-4.2.1/gcc/config/arm/crtn.asm
@@ -30,6 +30,11 @@
 #    This exception does not however invalidate any other reasons why
 #    the executable file might be covered by the GNU General Public License.
 # 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
 
 # This file just makes sure that the .fini and .init sections do in
 # fact return.  Users may put any desired instructions in those sections.
diff --git a/gcc-4.2.1/gcc/config/arm/eabi.h b/gcc-4.2.1/gcc/config/arm/eabi.h
index d69598c00..afe81556c 100644
--- a/gcc-4.2.1/gcc/config/arm/eabi.h
+++ b/gcc-4.2.1/gcc/config/arm/eabi.h
@@ -129,3 +129,6 @@
 "%{mandroid: %(endfile_android) ;" \
 "          : %(endfile_default)}"
 
+/* Add .note.GNU-stack.  */
+#undef NEED_INDICATE_EXEC_STACK
+#define NEED_INDICATE_EXEC_STACK       1
diff --git a/gcc-4.2.1/gcc/config/arm/lib1funcs.asm b/gcc-4.2.1/gcc/config/arm/lib1funcs.asm
index 2792b35e3..7e0831ade 100644
--- a/gcc-4.2.1/gcc/config/arm/lib1funcs.asm
+++ b/gcc-4.2.1/gcc/config/arm/lib1funcs.asm
@@ -27,6 +27,13 @@ You should have received a copy of the GNU General Public License
 along with this program; see the file COPYING.  If not, write to
 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 Boston, MA 02110-1301, USA.  */
+
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
+
 /* ------------------------------------------------------------------------ */
 
 /* We need to know what prefix to add to function names.  */
diff --git a/gcc-4.2.1/gcc/config/arm/libunwind.S b/gcc-4.2.1/gcc/config/arm/libunwind.S
index 81e4236f6..47625e3c1 100644
--- a/gcc-4.2.1/gcc/config/arm/libunwind.S
+++ b/gcc-4.2.1/gcc/config/arm/libunwind.S
@@ -26,6 +26,12 @@
    the Free Software Foundation, 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.  */
 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
+
 #ifndef __symbian__
 
 #include "lib1funcs.asm"
diff --git a/gcc-4.2.1/gcc/config/arm/linux-elf.h b/gcc-4.2.1/gcc/config/arm/linux-elf.h
index acb13cd01..a746cf541 100644
--- a/gcc-4.2.1/gcc/config/arm/linux-elf.h
+++ b/gcc-4.2.1/gcc/config/arm/linux-elf.h
@@ -104,3 +104,7 @@
 
 /* The GNU/Linux profiler needs a frame pointer.  */
 #define SUBTARGET_FRAME_POINTER_REQUIRED current_function_profile
+
+/* Add .note.GNU-stack.  */
+#undef NEED_INDICATE_EXEC_STACK
+#define NEED_INDICATE_EXEC_STACK        1