Add UCLIBC_HAS_SSP_COMPAT option guarding gcc-3.x ssp support

extra/Configs/Config.in

@@ -1304,11 +1304,21 @@ config UCLIBC_HAS_SSP
 	default n
 	help
 	  Add propolice smashing stack protector to the library.
-	  This requires a patched version of GCC or GCC 4.1, supporting the
+	  This requires GCC 4.1, supporting the -fstack-protector[-all]
+	  options. GCC does not have to provide libssp, the needed
+	  functions are added to ldso/libc instead.
+	  Most people will answer N.
+
+config UCLIBC_HAS_SSP_COMPAT
+	bool "Support for gcc-3.x propolice smashing stack protector"
+	depends on UCLIBC_HAS_SSP
+	default n
+	help
+	  Add gcc-3.x propolice smashing stack protector to the library.
+	  This requires a patched version of GCC, supporting the
 	  -fstack-protector[-all] options, with the __guard and
-	  __stack_smash_handler, respectively __stack_chk_guard and
-	  __stack_chk_fail functions removed from libgcc.
-	  These functions are added to libc instead.
+	  __stack_smash_handler functions removed from libgcc.
+	  These functions are added to ldso/libc instead.
 	  More information at:
 	  <http://www.research.ibm.com/trl/projects/security/ssp/>
 	  Most people will answer N.

ldso/ldso/ldso.c

@@ -89,11 +89,16 @@ extern void _start(void);
 #ifdef __UCLIBC_HAS_SSP__
 #include <dl-osinfo.h>
 uintptr_t stack_chk_guard;
-#ifndef THREAD_SET_STACK_GUARD
+# ifndef THREAD_SET_STACK_GUARD
 /* Only exported for architectures that don't store the stack guard canary
  * in local thread area.  */
 uintptr_t __stack_chk_guard attribute_relro;
+#  ifdef __UCLIBC_HAS_SSP_COMPAT__
 strong_alias(__stack_chk_guard,__guard)
+#  endif
+# elif __UCLIBC_HAS_SSP_COMPAT__
+uintptr_t __guard attribute_relro;
+# endif
 #endif
 #endif
 
@@ -268,6 +273,9 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, unsigned long load_addr,
 	stack_chk_guard = _dl_setup_stack_chk_guard ();
 # ifdef THREAD_SET_STACK_GUARD
 	THREAD_SET_STACK_GUARD (stack_chk_guard);
+#  ifdef __UCLIBC_HAS_SSP_COMPAT__
+	__guard = stack_chk_guard;
+#  endif
 # else
 	__stack_chk_guard = stack_chk_guard;
 # endif

libc/misc/internals/__uClibc_main.c

@@ -61,11 +61,15 @@ uintptr_t stack_chk_guard;
 /* for gcc-4.1 non-TLS */
 uintptr_t __stack_chk_guard attribute_relro;
 /* for gcc-3.x + Etoh ssp */
-#   ifdef __HAVE_SHARED__
+#   ifdef __UCLIBC_HAS_SSP_COMPAT__
+#    ifdef __HAVE_SHARED__
 strong_alias(__stack_chk_guard,__guard)
-#   else
+#    else
 uintptr_t __guard attribute_relro;
+#    endif
 #   endif
+#  elif defined __UCLIBC_HAS_SSP_COMPAT__
+uintptr_t __guard attribute_relro;
 #  endif
 # endif
 
@@ -210,9 +214,12 @@ void __uClibc_init(void)
     stack_chk_guard = _dl_setup_stack_chk_guard();
 #  ifdef THREAD_SET_STACK_GUARD
     THREAD_SET_STACK_GUARD (stack_chk_guard);
+#   ifdef __UCLIBC_HAS_SSP_COMPAT__
+    __guard = stack_chk_guard;
+#   endif
 #  else
     __stack_chk_guard = stack_chk_guard;
-#   ifndef __HAVE_SHARED__
+#   if !defined __HAVE_SHARED__ && defined __UCLIBC_HAS_SSP_COMPAT__
      __guard = stack_chk_guard;
 #   endif
 #  endif