getrusage.test: check that getrusage parser does not access extra memory

Place struct rusage at the end of an allocated memory page followed by
an inaccessible page.

* tests/getrusage.c (main): Use tail_alloc.

1 files changed, 37 insertions, 9 deletions

diff --git a/tests/getrusage.c b/tests/getrusage.c
index 75a4de01b..99b4fa69c 100644
--- a/tests/getrusage.c
+++ b/tests/getrusage.c
@@ -1,3 +1,31 @@
+/*
+ * Copyright (c) 2016 Fei Jie <feij.fnst@cn.fujitsu.com>
+ * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 #include "tests.h"
 #include <sys/syscall.h>
 
@@ -10,21 +38,21 @@
 int
 main(void)
 {
-	struct rusage usage;
-	int rc = syscall(__NR_getrusage, RUSAGE_SELF, &usage);
+	struct rusage *const usage = tail_alloc(sizeof(struct rusage));
+	int rc = syscall(__NR_getrusage, RUSAGE_SELF, usage);
 	printf("getrusage(RUSAGE_SELF, {ru_utime={%lu, %lu}"
 	       ", ru_stime={%lu, %lu}, ru_maxrss=%lu, ru_ixrss=%lu"
 	       ", ru_idrss=%lu, ru_isrss=%lu, ru_minflt=%lu"
 	       ", ru_majflt=%lu, ru_nswap=%lu, ru_inblock=%lu"
 	       ", ru_oublock=%lu, ru_msgsnd=%lu, ru_msgrcv=%lu"
 	       ", ru_nsignals=%lu, ru_nvcsw=%lu, ru_nivcsw=%lu}) = %d\n",
-	       usage.ru_utime.tv_sec, usage.ru_utime.tv_usec,
-	       usage.ru_stime.tv_sec, usage.ru_stime.tv_usec,
-	       usage.ru_maxrss, usage.ru_ixrss, usage.ru_idrss,
-	       usage.ru_isrss, usage.ru_minflt, usage.ru_majflt,
-	       usage.ru_nswap, usage.ru_inblock, usage.ru_oublock,
-	       usage.ru_msgsnd, usage.ru_msgrcv, usage.ru_nsignals,
-	       usage.ru_nvcsw, usage.ru_nivcsw, rc);
+	       usage->ru_utime.tv_sec, usage->ru_utime.tv_usec,
+	       usage->ru_stime.tv_sec, usage->ru_stime.tv_usec,
+	       usage->ru_maxrss, usage->ru_ixrss, usage->ru_idrss,
+	       usage->ru_isrss, usage->ru_minflt, usage->ru_majflt,
+	       usage->ru_nswap, usage->ru_inblock, usage->ru_oublock,
+	       usage->ru_msgsnd, usage->ru_msgrcv, usage->ru_nsignals,
+	       usage->ru_nvcsw, usage->ru_nivcsw, rc);
 
 	puts("+++ exited with 0 +++");
 	return 0;