[LTP] [PATCH v4] getcpu: Add testcase for EFAULT

[Ma Xinjian]

Add a testcase with the arguments point to an invalid address.

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.de>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Ma Xinjian <maxj.fnst@fujitsu.com>
---
 runtest/syscalls                            |  1 +
 testcases/kernel/syscalls/getcpu/getcpu02.c | 71 +++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 testcases/kernel/syscalls/getcpu/getcpu02.c

diff --git a/runtest/syscalls b/runtest/syscalls
index b8728c1c5..1537b5022 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -448,6 +448,7 @@ futimesat01 futimesat01
 getcontext01 getcontext01
 
 getcpu01 getcpu01
+getcpu02 getcpu02
 
 getcwd01 getcwd01
 getcwd02 getcwd02
diff --git a/testcases/kernel/syscalls/getcpu/getcpu02.c b/testcases/kernel/syscalls/getcpu/getcpu02.c
new file mode 100644
index 000000000..859cb0d3e
--- /dev/null
+++ b/testcases/kernel/syscalls/getcpu/getcpu02.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2024 FUJITSU LIMITED. All Rights Reserved.
+ * Copyright (c) Linux Test Project, 2024
+ * Author: Ma Xinjian <maxj.fnst@fujitsu.com>
+ *
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that getcpu(2) fails with EFAULT:
+ *
+ * 1) cpu_id points outside the calling process's address space.
+ * 2) node_id points outside the calling process's address space.
+ */
+
+#define _GNU_SOURCE
+
+#include "tst_test.h"
+#include "lapi/sched.h"
+
+static unsigned int cpu_id, node_id;
+
+static struct tcase {
+	unsigned int *cpu_id;
+	unsigned int *node_id;
+} tcases[] = {
+	{NULL, &node_id},
+	{&cpu_id, NULL}
+};
+
+static void check_getcpu(unsigned int n)
+{
+	struct tcase *tc = &tcases[n];
+	int status;
+	pid_t pid;
+
+	if (n == 0) {
+		tst_res(TINFO, "Make cpu_id point outside the calling process's address space.");
+		tc->cpu_id = tst_get_bad_addr(NULL);
+	} else if (n == 1) {
+		tst_res(TINFO, "Make node_id point outside the calling process's address space.");
+		tc->node_id = tst_get_bad_addr(NULL);
+	}
+
+	pid = SAFE_FORK();
+	if (!pid) {
+		TST_EXP_FAIL(getcpu(tc->cpu_id, tc->node_id), EFAULT);
+
+		exit(0);
+	}
+
+	SAFE_WAITPID(pid, &status, 0);
+
+	if (WIFSIGNALED(status) && WTERMSIG(status) == SIGSEGV) {
+		tst_res(TPASS, "getcpu() caused SIGSEGV");
+		return;
+	}
+
+	if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
+		return;
+
+	tst_res(TFAIL, "child %s", tst_strstatus(status));
+}
+
+static struct tst_test test = {
+	.test = check_getcpu,
+	.tcnt = ARRAY_SIZE(tcases),
+	.forks_child = 1,
+};
-- 
2.42.0