re PR sanitizer/78651 (Incorrect exception handling when catch clause uses local…

re PR sanitizer/78651 (Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active)

2018-03-19  Maxim Ostapenko  <m.ostapenko@samsung.com>

gcc/

	PR sanitizer/78651
	* dwarf2asm.c (dw2_output_indirect_constant_1): Disable ASan before
	calling assemble_variable.

gcc/testsuite/

	PR sanitizer/78651
	* g++.dg/asan/pr78651.C: New test.

From-SVN: r258658

gcc/ChangeLog

+2018-03-19  Maxim Ostapenko  <m.ostapenko@samsung.com>
+
+	PR sanitizer/78651
+	* dwarf2asm.c (dw2_output_indirect_constant_1): Disable ASan before
+	calling assemble_variable.
+
 2018-03-19  Sudakshina Das  <sudi.das@arm.com>
 
 	PR target/81647

gcc/dwarf2asm.c

@@ -967,7 +967,13 @@ dw2_output_indirect_constant_1 (const char *sym, tree id)
     }
 
   sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
+  /* Disable ASan for decl because redzones cause ABI breakage between GCC and
+     libstdc++ for `.LDFCM*' variables.  See PR 78651 for details.  */
+  unsigned int save_flag_sanitize = flag_sanitize;
+  flag_sanitize &= ~(SANITIZE_ADDRESS | SANITIZE_USER_ADDRESS
+		     | SANITIZE_KERNEL_ADDRESS);
   assemble_variable (decl, 1, 1, 1);
+  flag_sanitize = save_flag_sanitize;
   assemble_integer (sym_ref, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
 
   return 0;

gcc/testsuite/ChangeLog

+2018-03-19  Maxim Ostapenko  <m.ostapenko@samsung.com>
+
+	PR sanitizer/78651
+	* g++.dg/asan/pr78651.C: New test.
+
 2018-03-19  Tom de Vries  <tom@codesourcery.com>
 
 	* gcc.dg/tree-ssa/pr84512.c: Don't require effective target

gcc/testsuite/g++.dg/asan/pr78651.C

+// PR sanitizer/78651
+// { dg-do run }
+// { dg-additional-options "-fpic" { target fpic } }
+
+struct A { };
+
+namespace {
+
+void thisThrows () {
+  throw A();
+}
+
+struct SomeRandomType {};
+}
+
+int main() {
+  try {
+    thisThrows();
+  }
+  catch (SomeRandomType) {
+    throw;
+  }
+  catch (A) {
+  }
+  return 0;
+}