re PR sanitizer/58443 (ubsan doesn't properly honor fsanitize= flags)

2013-09-18  Marek Polacek  <polacek@redhat.com>

	PR sanitize/58443
cp/
	* typeck.c (cp_build_binary_op): Properly honor -fsanitize options.
	Remove unnecessary check.

c/
	* c-typeck.c (build_binary_op): Properly honor -fsanitize options.
	Remove unnecessary check.

testsuite/
	* g++.dg/ubsan/div-by-zero-1.C: Use the integer-divide-by-zero option
	instead of the shift option.
	* c-c++-common/ubsan/pr58443-1.c: New test.
	* c-c++-common/ubsan/pr58443-3.c: New test.
	* c-c++-common/ubsan/pr58443-2.c: New test.

From-SVN: r202701

gcc/c/ChangeLog

 2013-09-18  Marek Polacek  <polacek@redhat.com>
 
+	PR sanitize/58443
+	* c-typeck.c (build_binary_op): Properly honor -fsanitize options.
+	Remove unnecessary check.
+
+2013-09-18  Marek Polacek  <polacek@redhat.com>
+
 	PR sanitizer/58411
 	* c-typeck.c (build_binary_op): Don't sanitize function if it has the
 	no_sanitize_undefined attribute.

gcc/c/c-typeck.c

@@ -10496,7 +10496,7 @@ build_binary_op (location_t location, enum tree_code code,
 	return error_mark_node;
     }
 
-  if (flag_sanitize & SANITIZE_UNDEFINED
+  if ((flag_sanitize & (SANITIZE_SHIFT | SANITIZE_DIVIDE))
       && current_function_decl != 0
       && !lookup_attribute ("no_sanitize_undefined",
 			    DECL_ATTRIBUTES (current_function_decl))
@@ -10507,9 +10507,9 @@ build_binary_op (location_t location, enum tree_code code,
       op1 = c_save_expr (op1);
       op0 = c_fully_fold (op0, false, NULL);
       op1 = c_fully_fold (op1, false, NULL);
-      if (doing_div_or_mod)
+      if (doing_div_or_mod && (flag_sanitize & SANITIZE_DIVIDE))
 	instrument_expr = ubsan_instrument_division (location, op0, op1);
-      else if (doing_shift)
+      else if (doing_shift && (flag_sanitize & SANITIZE_SHIFT))
 	instrument_expr = ubsan_instrument_shift (location, code, op0, op1);
     }
 
@@ -10537,7 +10537,7 @@ build_binary_op (location_t location, enum tree_code code,
     ret = build1 (EXCESS_PRECISION_EXPR, semantic_result_type, ret);
   protected_set_expr_location (ret, location);
 
-  if ((flag_sanitize & SANITIZE_UNDEFINED) && instrument_expr != NULL)
+  if (instrument_expr != NULL)
     ret = fold_build2 (COMPOUND_EXPR, TREE_TYPE (ret),
 		       instrument_expr, ret);
 

gcc/cp/ChangeLog

 2013-09-18  Marek Polacek  <polacek@redhat.com>
 
+	PR sanitize/58443
+	* typeck.c (cp_build_binary_op): Properly honor -fsanitize options.
+	Remove unnecessary check.
+
+2013-09-18  Marek Polacek  <polacek@redhat.com>
+
 	PR sanitizer/58411
 	* typeck.c (cp_build_binary_op): Don't sanitize function if it has the
 	no_sanitize_undefined attribute.

gcc/cp/typeck.c

@@ -4884,7 +4884,7 @@ cp_build_binary_op (location_t location,
   if (build_type == NULL_TREE)
     build_type = result_type;
 
-  if ((flag_sanitize & SANITIZE_UNDEFINED)
+  if ((flag_sanitize & (SANITIZE_SHIFT | SANITIZE_DIVIDE))
       && !processing_template_decl
       && current_function_decl != 0
       && !lookup_attribute ("no_sanitize_undefined",
@@ -4898,7 +4898,7 @@ cp_build_binary_op (location_t location,
 								  tf_none));
       op1 = maybe_constant_value (fold_non_dependent_expr_sfinae (op1,
 								  tf_none));
-      if (doing_div_or_mod)
+      if (doing_div_or_mod && (flag_sanitize & SANITIZE_DIVIDE))
 	{
 	  /* For diagnostics we want to use the promoted types without
 	     shorten_binary_op.  So convert the arguments to the
@@ -4912,7 +4912,7 @@ cp_build_binary_op (location_t location,
 	    }
 	  instrument_expr = ubsan_instrument_division (location, cop0, cop1);
 	}
-      else if (doing_shift)
+      else if (doing_shift && (flag_sanitize & SANITIZE_SHIFT))
 	instrument_expr = ubsan_instrument_shift (location, code, op0, op1);
     }
 
@@ -4926,7 +4926,7 @@ cp_build_binary_op (location_t location,
       && !TREE_OVERFLOW_P (op1))
     overflow_warning (location, result);
 
-  if ((flag_sanitize & SANITIZE_UNDEFINED) && instrument_expr != NULL)
+  if (instrument_expr != NULL)
     result = fold_build2 (COMPOUND_EXPR, TREE_TYPE (result),
 			  instrument_expr, result);
 

gcc/testsuite/ChangeLog

+2013-09-18  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitize/58443
+	* g++.dg/ubsan/div-by-zero-1.C: Use the integer-divide-by-zero option
+	instead of the shift option.
+	* c-c++-common/ubsan/pr58443-1.c: New test.
+	* c-c++-common/ubsan/pr58443-3.c: New test.
+	* c-c++-common/ubsan/pr58443-2.c: New test.
+
 2013-09-18  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/58417

gcc/testsuite/c-c++-common/ubsan/pr58443-1.c

+/* PR sanitizer/58443 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=shift,unreachable -w" } */
+
+int
+foo (int u, int o)
+{
+  return u / o;
+}
+
+/* { dg-final { scan-assembler-not "__ubsan_handle_divrem_overflow" } } */

gcc/testsuite/c-c++-common/ubsan/pr58443-2.c

+/* PR sanitizer/58443 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=unreachable,integer-divide-by-zero -w" } */
+
+int
+foo (int u, int o)
+{
+  return u >> o;
+}
+
+/* { dg-final { scan-assembler-not "__ubsan_handle_shift_out_of_bounds" } } */

gcc/testsuite/c-c++-common/ubsan/pr58443-3.c

+/* PR sanitizer/58443 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=undefined -w" } */
+
+int
+foo (int u, int o)
+{
+  return u >> o;
+}
+
+int
+bar (int u, int o)
+{
+  return u / o;
+}
+
+/* { dg-final { scan-assembler "__ubsan_handle_divrem_overflow" } } */
+/* { dg-final { scan-assembler "__ubsan_handle_shift_out_of_bounds" } } */

gcc/testsuite/g++.dg/ubsan/div-by-zero-1.C

 /* { dg-do compile } */
-/* { dg-options "-fsanitize=shift -w" } */
+/* { dg-options "-fsanitize=integer-divide-by-zero -w" } */
 
 void
 foo (int i)