From: Martin Liska <mliska@suse.cz>
Date: Tue, 11 Apr 2017 13:08:08 +0000 (+0200)
Subject: Do not instrument register variables in object-size sanitizer (PR sanitizer/70878).
X-Git-Tag: basepoints/gcc-8~102
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9f679370006ed036fb1545ebc272d4f1b39641a3;p=thirdparty%2Fgcc.git

Do not instrument register variables in object-size sanitizer (PR sanitizer/70878).

2017-04-11  Martin Liska  <mliska@suse.cz>

	PR sanitizer/70878
	* ubsan.c (instrument_object_size): Do not instrument register
	variables.
2017-04-11  Martin Liska  <mliska@suse.cz>

	PR sanitizer/70878
	* gcc.dg/ubsan/pr70878.c: New test.

From-SVN: r246837
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c56b4505a35d..71894ec9b4cf 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-04-11  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/70878
+	* ubsan.c (instrument_object_size): Do not instrument register
+	variables.
+
 2017-04-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/80381
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ebfe7392a985..116b5b2707dd 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-04-11  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/70878
+	* gcc.dg/ubsan/pr70878.c: New test.
+
 2017-04-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/80381
diff --git a/gcc/testsuite/gcc.dg/ubsan/pr70878.c b/gcc/testsuite/gcc.dg/ubsan/pr70878.c
new file mode 100644
index 000000000000..acd7fb05e4c4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ubsan/pr70878.c
@@ -0,0 +1,9 @@
+/* PR sanitizer/80878 */
+/* { dg-do compile { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
+/* { dg-options "-fsanitize=object-size" } */
+
+void * sbrk ()
+{
+ volatile register unsigned int sp_r1 __asm__ ("ebx");
+ return __builtin_strcat ((char*)sp_r1, 0); /* { dg-warning "cast to pointer from integer of different size" } */
+}
diff --git a/gcc/ubsan.c b/gcc/ubsan.c
index 323c1ccdb490..c01d63318c23 100644
--- a/gcc/ubsan.c
+++ b/gcc/ubsan.c
@@ -1806,7 +1806,11 @@ instrument_object_size (gimple_stmt_iterator *gsi, bool is_lhs)
   bool decl_p = DECL_P (inner);
   tree base;
   if (decl_p)
-    base = inner;
+    {
+      if (DECL_REGISTER (inner))
+	return;
+      base = inner;
+    }
   else if (TREE_CODE (inner) == MEM_REF)
     base = TREE_OPERAND (inner, 0);
   else