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-rw-r--r--debug/tst-chk1.c36
1 files changed, 35 insertions, 1 deletions
diff --git a/debug/tst-chk1.c b/debug/tst-chk1.c
index 487b071..e03f3db 100644
--- a/debug/tst-chk1.c
+++ b/debug/tst-chk1.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+/* Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
@@ -20,6 +20,7 @@
#include <assert.h>
#include <fcntl.h>
#include <locale.h>
+#include <obstack.h>
#include <paths.h>
#include <setjmp.h>
#include <signal.h>
@@ -31,6 +32,9 @@
#include <sys/socket.h>
#include <sys/un.h>
+#define obstack_chunk_alloc malloc
+#define obstack_chunk_free free
+
char *temp_filename;
static void do_prepare (void);
static int do_test (void);
@@ -705,6 +709,36 @@ do_test (void)
if (fprintf (fp, buf2 + 4, str5) != 7)
FAIL ();
+ char *my_ptr = NULL;
+ strcpy (buf2 + 2, "%n%s%n");
+ /* When the format string is writable and contains %n,
+ with -D_FORTIFY_SOURCE=2 it causes __chk_fail. */
+ CHK_FAIL2_START
+ if (asprintf (&my_ptr, buf2, str4, &n1, str5, &n1) != 14)
+ FAIL ();
+ else
+ free (my_ptr);
+ CHK_FAIL2_END
+
+ struct obstack obs;
+ obstack_init (&obs);
+ CHK_FAIL2_START
+ if (obstack_printf (&obs, buf2, str4, &n1, str5, &n1) != 14)
+ FAIL ();
+ CHK_FAIL2_END
+ obstack_free (&obs, NULL);
+
+ my_ptr = NULL;
+ if (asprintf (&my_ptr, "%s%n%s%n", str4, &n1, str5, &n1) != 14)
+ FAIL ();
+ else
+ free (my_ptr);
+
+ obstack_init (&obs);
+ if (obstack_printf (&obs, "%s%n%s%n", str4, &n1, str5, &n1) != 14)
+ FAIL ();
+ obstack_free (&obs, NULL);
+
if (freopen (temp_filename, "r", stdin) == NULL)
{
puts ("could not open temporary file");