From: Richard Biener <rguenther@suse.de>
Date: Thu, 21 Mar 2024 07:30:39 +0000 (+0100)
Subject: tree-optimization/111736 - avoid address sanitizing of __seg_gs
X-Git-Tag: releases/gcc-12.4.0~178
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e89b5ed62a5a06fb8918ffa1616f0f37c8d359c3;p=thirdparty%2Fgcc.git

tree-optimization/111736 - avoid address sanitizing of __seg_gs

The following more thoroughly avoids address sanitizing accesses
to non-generic address-spaces.

	PR tree-optimization/111736
	* asan.cc (instrument_derefs): Do not instrument accesses
	to non-generic address-spaces.

	* gcc.target/i386/pr111736.c: New testcase.

(cherry picked from commit 134ef2a8cac1a5cc718739bd7d3b3472947c80d6)
---

diff --git a/gcc/asan.cc b/gcc/asan.cc
index 0c5afa36cb85..24cf2b8376ba 100644
--- a/gcc/asan.cc
+++ b/gcc/asan.cc
@@ -2712,6 +2712,10 @@ instrument_derefs (gimple_stmt_iterator *iter, tree t,
   if (VAR_P (inner) && DECL_HARD_REGISTER (inner))
     return;
 
+  /* Accesses to non-generic address-spaces should not be instrumented.  */
+  if (!ADDR_SPACE_GENERIC_P (TYPE_ADDR_SPACE (TREE_TYPE (inner))))
+    return;
+
   poly_int64 decl_size;
   if ((VAR_P (inner) || TREE_CODE (inner) == RESULT_DECL)
       && offset == NULL_TREE
diff --git a/gcc/testsuite/gcc.target/i386/pr111736.c b/gcc/testsuite/gcc.target/i386/pr111736.c
new file mode 100644
index 000000000000..231fdd07e803
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr111736.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fsanitize=address" } */
+
+int __seg_gs m;
+
+int foo (void)
+{
+  return m;
+}
+
+extern int  __seg_gs n;
+
+int bar (void)
+{
+  return n;
+}
+
+int baz (int __seg_gs *o)
+{
+  return *o;
+}
+
+/* { dg-final { scan-assembler-not "asan_report_load" } } */