asan.c (set_sanitized_sections): New function.

2015-04-17  Yury Gribov  <y.gribov@samsung.com>

gcc/
	* asan.c (set_sanitized_sections): New function.
	(section_sanitized_p): Ditto.
	(asan_protect_global): Optionally sanitize user-defined
	sections.
	* asan.h (set_sanitized_sections): Declare new function.
	* common.opt (fsanitize-sections): New option.
	* doc/invoke.texi (-fsanitize-sections): Document new option.
	* opts-global.c (handle_common_deferred_options): Handle new
	option.

gcc/testsuite/
	* c-c++-common/asan/user-section-1.c: New test.

From-SVN: r222168

1 files changed, 30 insertions, 1 deletions

diff --git a/gcc/asan.c b/gcc/asan.c
index 9e4a629..6706af7 100644
--- a/gcc/asan.c
+++ b/gcc/asan.c
@@ -272,6 +272,7 @@ along with GCC; see the file COPYING3.  If not see
 
 static unsigned HOST_WIDE_INT asan_shadow_offset_value;
 static bool asan_shadow_offset_computed;
+static const char *sanitized_sections;
 
 /* Sets shadow offset to value in string VAL.  */
 
@@ -294,6 +295,33 @@ set_asan_shadow_offset (const char *val)
   return true;
 }
 
+/* Set list of user-defined sections that need to be sanitized.  */
+
+void
+set_sanitized_sections (const char *secs)
+{
+  sanitized_sections = secs;
+}
+
+/* Checks whether section SEC should be sanitized.  */
+
+static bool
+section_sanitized_p (const char *sec)
+{
+  if (!sanitized_sections)
+    return false;
+  size_t len = strlen (sec);
+  const char *p = sanitized_sections;
+  while ((p = strstr (p, sec)))
+    {
+      if ((p == sanitized_sections || p[-1] == ',')
+	  && (p[len] == 0 || p[len] == ','))
+	return true;
+      ++p;
+    }
+  return false;
+}
+
 /* Returns Asan shadow offset.  */
 
 static unsigned HOST_WIDE_INT
@@ -1374,7 +1402,8 @@ asan_protect_global (tree decl)
 	 to be an array of such vars, putting padding in there
 	 breaks this assumption.  */
       || (DECL_SECTION_NAME (decl) != NULL
-	  && !symtab_node::get (decl)->implicit_section)
+	  && !symtab_node::get (decl)->implicit_section
+	  && !section_sanitized_p (DECL_SECTION_NAME (decl)))
       || DECL_SIZE (decl) == 0
       || ASAN_RED_ZONE_SIZE * BITS_PER_UNIT > MAX_OFILE_ALIGNMENT
       || !valid_constant_size_p (DECL_SIZE_UNIT (decl))