From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 7 May 2024 19:29:14 +0000 (+0200)
Subject: tree-inline: Remove .ASAN_MARK calls when inlining functions into no_sanitize callers... 
X-Git-Tag: basepoints/gcc-16~9251
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d4e25cf4f7c1f51a8824cc62bbb85a81a41b829a;p=thirdparty%2Fgcc.git

tree-inline: Remove .ASAN_MARK calls when inlining functions into no_sanitize callers [PR114956]

In r9-5742 we've started allowing to inline always_inline functions into
functions which have disabled e.g. address sanitization even when the
always_inline function is implicitly from command line options sanitized.

This mostly works fine because most of the asan instrumentation is done only
late after ipa, but as the following testcase the .ASAN_MARK ifn calls
gimplifier adds can result in ICEs.

Fixed by dropping those during inlining, similarly to how we drop
.TSAN_FUNC_EXIT calls.

2024-05-07  Jakub Jelinek  <jakub@redhat.com>

	PR sanitizer/114956
	* tree-inline.cc: Include asan.h.
	(copy_bb): Remove also .ASAN_MARK calls if id->dst_fn has asan/hwasan
	sanitization disabled.

	* gcc.dg/asan/pr114956.c: New test.
---

diff --git a/gcc/testsuite/gcc.dg/asan/pr114956.c b/gcc/testsuite/gcc.dg/asan/pr114956.c
new file mode 100644
index 000000000000..fb87d514f255
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/asan/pr114956.c
@@ -0,0 +1,26 @@
+/* PR sanitizer/114956 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fsanitize=address,null" } */
+
+int **a;
+void qux (int *);
+
+__attribute__((always_inline)) static inline int *
+foo (void)
+{
+  int b[1];
+  qux (b);
+  return a[1];
+}
+
+__attribute__((no_sanitize_address)) void
+bar (void)
+{
+  *a = foo ();
+}
+
+void
+baz (void)
+{
+  bar ();
+}
diff --git a/gcc/tree-inline.cc b/gcc/tree-inline.cc
index b9fe2099d4f8..f31a34ac4105 100644
--- a/gcc/tree-inline.cc
+++ b/gcc/tree-inline.cc
@@ -65,6 +65,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "symbol-summary.h"
 #include "symtab-thunks.h"
 #include "symtab-clones.h"
+#include "asan.h"
 
 /* I'm not real happy about this, but we need to handle gimple and
    non-gimple trees.  */
@@ -2226,13 +2227,26 @@ copy_bb (copy_body_data *id, basic_block bb,
 	    }
 	  else if (call_stmt
 		   && id->call_stmt
-		   && gimple_call_internal_p (stmt)
-		   && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
-	    {
-	      /* Drop TSAN_FUNC_EXIT () internal calls during inlining.  */
-	      gsi_remove (&copy_gsi, false);
-	      continue;
-	    }
+		   && gimple_call_internal_p (stmt))
+	    switch (gimple_call_internal_fn (stmt))
+	      {
+	      case IFN_TSAN_FUNC_EXIT:
+		/* Drop .TSAN_FUNC_EXIT () internal calls during inlining.  */
+		gsi_remove (&copy_gsi, false);
+		continue;
+	      case IFN_ASAN_MARK:
+		/* Drop .ASAN_MARK internal calls during inlining into
+		   no_sanitize functions.  */
+		if (!sanitize_flags_p (SANITIZE_ADDRESS, id->dst_fn)
+		    && !sanitize_flags_p (SANITIZE_HWADDRESS, id->dst_fn))
+		  {
+		    gsi_remove (&copy_gsi, false);
+		    continue;
+		  }
+		break;
+	      default:
+		break;
+	      }
 
 	  /* Statements produced by inlining can be unfolded, especially
 	     when we constant propagated some operands.  We can't fold