[LTP] [PATCH v3] getcpu: Add testcase for EFAULT

[Ma Xinjian]

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

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 | 97 +++++++++++++++++++++
 2 files changed, 98 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..f32660ef9
--- /dev/null
+++ b/testcases/kernel/syscalls/getcpu/getcpu02.c
@@ -0,0 +1,97 @@
+// 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 arguments point outside the calling process's address
+ *          space.
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+
+#include "tst_test.h"
+#include "lapi/sched.h"
+
+static void *bad_addr;
+
+static void setup(void)
+{
+	bad_addr = tst_get_bad_addr(NULL);
+}
+
+static void check_bad_cpu_id(void *bad_addr, unsigned int *node_id)
+{
+	int status;
+	pid_t pid;
+
+	pid = SAFE_FORK();
+	if (!pid) {
+		TST_EXP_FAIL(getcpu(bad_addr, 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 void check_bad_node_id(unsigned int *cpu_id, void *bad_addr)
+{
+	int status;
+	pid_t pid;
+
+	pid = SAFE_FORK();
+	if (!pid) {
+		TST_EXP_FAIL(getcpu(cpu_id, bad_addr), 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 void run_test(void)
+{
+	unsigned int cpu_id, node_id = 0;
+
+	check_bad_cpu_id(bad_addr, &node_id);
+	check_bad_node_id(&cpu_id, bad_addr);
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.test_all = run_test,
+	.forks_child = 1,
+};
-- 
2.42.0