Correct ssp code

Avoid using strong_alias in ssp, some archs dislike it.
Make stack_chk_guard static.
Export __stack_smash_handler only if compatibility option is enabled.

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>

ldso/ldso/ldso.c

@@ -102,15 +102,13 @@ extern void _start(void);
 
 #ifdef __UCLIBC_HAS_SSP__
 # include <dl-osinfo.h>
-uintptr_t stack_chk_guard;
+static uintptr_t stack_chk_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 defined __UCLIBC_HAS_SSP_COMPAT__
+# endif
+# ifdef __UCLIBC_HAS_SSP_COMPAT__
 uintptr_t __guard attribute_relro;
 # endif
 #endif
@@ -944,12 +942,12 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE 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
+# ifdef __UCLIBC_HAS_SSP_COMPAT__
+	__guard = stack_chk_guard;
+# endif
 #endif
 
 

libc/misc/internals/__uClibc_main.c

@@ -45,22 +45,15 @@ void *__libc_stack_end = NULL;
 
 # ifdef __UCLIBC_HAS_SSP__
 #  include <dl-osinfo.h>
+static uintptr_t stack_chk_guard;
 #  ifndef THREAD_SET_STACK_GUARD
 /* Only exported for architectures that don't store the stack guard canary
  * in thread local area. */
-#   include <stdint.h>
-uintptr_t stack_chk_guard;
 /* for gcc-4.1 non-TLS */
 uintptr_t __stack_chk_guard attribute_relro;
+#  endif
 /* for gcc-3.x + Etoh ssp */
-#   ifdef __UCLIBC_HAS_SSP_COMPAT__
-#    ifdef __HAVE_SHARED__
-strong_alias(__stack_chk_guard,__guard)
-#    else
-uintptr_t __guard attribute_relro;
-#    endif
-#   endif
-#  elif defined __UCLIBC_HAS_SSP_COMPAT__
+#  ifdef __UCLIBC_HAS_SSP_COMPAT__
 uintptr_t __guard attribute_relro;
 #  endif
 # endif
@@ -251,18 +244,14 @@ void __uClibc_init(void)
 #ifndef SHARED
 # ifdef __UCLIBC_HAS_SSP__
     /* Set up the stack checker's canary.  */
+    stack_chk_guard = _dl_setup_stack_chk_guard();
 #  ifdef THREAD_SET_STACK_GUARD
-    uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard();
     THREAD_SET_STACK_GUARD (stack_chk_guard);
-#   ifdef __UCLIBC_HAS_SSP_COMPAT__
-    stack_chk_guard = _dl_setup_stack_chk_guard();
-    __guard = stack_chk_guard;
-#   endif
 #  else
     __stack_chk_guard = stack_chk_guard;
-#   if !defined __HAVE_SHARED__ && defined __UCLIBC_HAS_SSP_COMPAT__
-     __guard = stack_chk_guard;
-#   endif
+#  endif
+#  ifdef __UCLIBC_HAS_SSP_COMPAT__
+    __guard = stack_chk_guard;
 #  endif
 # endif
 #endif

libc/sysdeps/linux/common/ssp.c

@@ -71,6 +71,7 @@ static attribute_noreturn void terminate(void)
 	_exit(127);
 }
 
+#ifdef __UCLIBC_HAS_SSP_COMPAT__
 void __stack_smash_handler(char func[], int damaged __attribute__ ((unused))) attribute_noreturn __cold;
 void __stack_smash_handler(char func[], int damaged)
 {
@@ -84,6 +85,7 @@ void __stack_smash_handler(char func[], int damaged)
 	while(1)
 		terminate();
 }
+#endif
 
 void __stack_chk_fail(void) attribute_noreturn __cold;
 void __stack_chk_fail(void)
@@ -114,4 +116,3 @@ void __chk_fail(void)
 	while(1)
 		terminate();
 }
-