Add cachestat03 test

This test verifies that cachestat() syscall is properly failing with
relative error codes according to input parameters.

- EFAULT: cstat or cstat_range points to an illegal address
- EINVAL: invalid flags
- EBADF: invalid file descriptor
- EOPNOTSUPP: file descriptor is of a hugetlbfs file

Signed-off-by: Andrea Cervesato <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>

runtest/syscalls

@@ -64,6 +64,7 @@ cacheflush01 cacheflush01
 
 cachestat01 cachestat01
 cachestat02 cachestat02
+cachestat03 cachestat03
 
 chdir01 chdir01
 chdir01A symlink01 -T chdir01

testcases/kernel/syscalls/cachestat/.gitignore

@@ -1,2 +1,3 @@
 cachestat01
 cachestat02
+cachestat03

testcases/kernel/syscalls/cachestat/cachestat03.c

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <[email protected]>
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that cachestat() syscall is properly failing with relative
+ * error codes according to input parameters.
+ *
+ * - EFAULT: cstat or cstat_range points to an illegal address
+ * - EINVAL: invalid flags
+ * - EBADF: invalid file descriptor
+ * - EOPNOTSUPP: file descriptor is of a hugetlbfs file
+ */
+
+#define MNTPOINT "mnt"
+
+#include "cachestat.h"
+
+static int fd;
+static int fd_hugepage;
+static int invalid_fd = -1;
+static struct cachestat *cs;
+static struct cachestat *cs_null;
+static struct cachestat_range *cs_range;
+static struct cachestat_range *cs_range_null;
+
+static struct tcase {
+	int *fd;
+	struct cachestat_range **range;
+	struct cachestat **data;
+	int flags;
+	int exp_errno;
+	char *msg;
+} tcases[] = {
+	{&invalid_fd, &cs_range, &cs, 0, EBADF, "Invalid fd (-1)"},
+	{&fd, &cs_range_null, &cs, 0, EFAULT, "Invalid range (NULL)"},
+	{&fd, &cs_range, &cs_null, 0, EFAULT, "Invalid data (NULL)"},
+	{&fd, &cs_range, &cs, -1, EINVAL, "Invalid args (-1)"},
+	{&fd_hugepage, &cs_range, &cs, 0, EOPNOTSUPP, "Unsupported hugetlbfs"},
+};
+
+static void run(unsigned int i)
+{
+	struct tcase *tc = &tcases[i];
+
+	TST_EXP_FAIL(cachestat(*tc->fd, *tc->range, *tc->data, tc->flags),
+		tc->exp_errno, "%s", tc->msg);
+}
+
+static void setup(void)
+{
+	fd = SAFE_OPEN("test", O_CREAT | O_RDWR, 0700);
+	fd_hugepage = SAFE_OPEN(MNTPOINT"/test", O_CREAT | O_RDWR, 0700);
+}
+
+static void cleanup(void)
+{
+	SAFE_CLOSE(fd);
+	SAFE_CLOSE(fd_hugepage);
+}
+
+static struct tst_test test = {
+	.test = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.hugepages = {1, TST_NEEDS},
+	.tcnt = ARRAY_SIZE(tcases),
+	.min_kver = "6.5",
+	.needs_tmpdir = 1,
+	.bufs = (struct tst_buffers []) {
+		{&cs, .size = sizeof(struct cachestat)},
+		{&cs_range, .size = sizeof(struct cachestat_range)},
+		{}
+	},
+};