From 134ef2a8cac1a5cc718739bd7d3b3472947c80d6 Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Thu, 21 Mar 2024 08:30:39 +0100
Subject: [PATCH] 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.
---
gcc/asan.cc | 4 ++++
gcc/testsuite/gcc.target/i386/pr111736.c | 23 +++++++++++++++++++++++
2 files changed, 27 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/i386/pr111736.c
diff --git a/gcc/asan.cc b/gcc/asan.cc
index cfe831064605..7f91cc616fca 100644
--- a/gcc/asan.cc
+++ b/gcc/asan.cc
@@ -2755,6 +2755,10 @@ 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
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" } } */
--
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