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authorSiddhesh Poyarekar <siddhesh@redhat.com>2012-09-05 21:49:00 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2012-09-05 21:49:30 +0530
commit6ef9cc37f0ea151a54e5c8a19950a6d5b6ff8a96 (patch)
tree7dfbbb3bbdde79ba6bc06a209102c988c53e6e1c /malloc/tst-malloc-usable.c
parent4d038ae3163aba04218b05f3983473b25c943b8b (diff)
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Return requested size for malloc_usable_size when MALLOC_CHECK_ > 0
[BZ #1349] malloc_usable_size returns the usable size in an allocated chunk, which may be >= the requested size. In the case of MALLOC_CHECK_ being exported to > 0 however, only the requested size is usable, since a magic value is written at the end of the request size to trap writes beyond request bounds. Hence, when MALLOC_CHECK_ is exported to > 0, malloc_usable_size() should return the request size.
Diffstat (limited to 'malloc/tst-malloc-usable.c')
-rw-r--r--malloc/tst-malloc-usable.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/malloc/tst-malloc-usable.c b/malloc/tst-malloc-usable.c
new file mode 100644
index 0000000000..18decd852c
--- /dev/null
+++ b/malloc/tst-malloc-usable.c
@@ -0,0 +1,49 @@
+/* Ensure that malloc_usable_size returns the request size with
+ MALLOC_CHECK_ exported to a positive value.
+
+ Copyright (C) 2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <malloc.h>
+#include <string.h>
+#include <stdio.h>
+
+static int
+do_test (void)
+{
+ size_t usable_size;
+ void *p = malloc (7);
+ if (!p)
+ {
+ printf ("memory allocation failed\n");
+ return 1;
+ }
+
+ usable_size = malloc_usable_size (p);
+ if (usable_size != 7)
+ {
+ printf ("malloc_usable_size: expected 7 but got %zu\n", usable_size);
+ return 1;
+ }
+
+ memset (p, 0, usable_size);
+ free (p);
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"