[LTP] [PATCH] getrandom: Add negative tests for getrandom

[Yang Xu]

Add negative cases for getrandom(), when errno is EFAULT or EINVAL

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 runtest/syscalls                              |  1 +
 .../kernel/syscalls/getrandom/.gitignore      |  1 +
 .../kernel/syscalls/getrandom/getrandom05.c   | 46 +++++++++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 testcases/kernel/syscalls/getrandom/getrandom05.c

diff --git a/runtest/syscalls b/runtest/syscalls
index cc1e39c05..62eb4c1cd 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -504,6 +504,7 @@ getrandom01 getrandom01
 getrandom02 getrandom02
 getrandom03 getrandom03
 getrandom04 getrandom04
+getrandom05 getrandom05
 
 getresgid01 getresgid01
 getresgid01_16 getresgid01_16
diff --git a/testcases/kernel/syscalls/getrandom/.gitignore b/testcases/kernel/syscalls/getrandom/.gitignore
index ef06ece9d..e47d8b3f4 100644
--- a/testcases/kernel/syscalls/getrandom/.gitignore
+++ b/testcases/kernel/syscalls/getrandom/.gitignore
@@ -2,3 +2,4 @@
 /getrandom02
 /getrandom03
 /getrandom04
+/getrandom05
diff --git a/testcases/kernel/syscalls/getrandom/getrandom05.c b/testcases/kernel/syscalls/getrandom/getrandom05.c
new file mode 100644
index 000000000..a50228d3d
--- /dev/null
+++ b/testcases/kernel/syscalls/getrandom/getrandom05.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2024 FUJITSU LIMITED. All Rights Reserved.
+ * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that getrandom(2) fails with
+ *
+ * - EFAULT when buf address is outside the accessible address space
+ * - EINVAL when flag is invalid
+ */
+
+#include <sys/random.h>
+#include "tst_test.h"
+
+static char buff_efault[64];
+static char buff_einval[64];
+
+static struct test_case_t {
+	char *buff;
+	size_t size;
+	unsigned int flag;
+	int expected_errno;
+	char *desc;
+} tcases[] = {
+	{NULL, sizeof(buff_efault), 0, EFAULT,
+		"buf address is outside the accessible address space"},
+	{buff_einval, sizeof(buff_einval), -1, EINVAL, "flag is invalid"},
+};
+
+static void verify_getrandom(unsigned int i)
+{
+	struct test_case_t *tc = &tcases[i];
+
+	TST_EXP_FAIL(getrandom(tc->buff, tc->size, tc->flag),
+		tc->expected_errno, "%s", tc->desc);
+}
+
+static struct tst_test test = {
+	.tcnt = ARRAY_SIZE(tcases),
+	.test = verify_getrandom,
+	.needs_root = 1,
+};
-- 
2.39.3