1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
4 * Copyright (c) Linux Test Project, 2020-2023
5 * Author: Saji Kumar.V.R <saji.kumar@wipro.com>
6 */
7
8/*\
9 * [Description]
10 *
11 * Test whether capset() can be used to modify the capabilities of a thread
12 * other than itself. Now, most linux distributions with kernel supporting
13 * VFS capabilities, this should be never permitted.
14 */
15
16#include <stdlib.h>
17#include <sys/types.h>
18#include <unistd.h>
19#include "tst_test.h"
20#include "lapi/syscalls.h"
21#include <linux/capability.h>
22
23static struct __user_cap_header_struct *header;
24static struct __user_cap_data_struct *data;
25static pid_t child_pid;
26
27static void verify_capset(void)
28{
29	child_pid = SAFE_FORK();
30	if (!child_pid)
31		pause();
32
33	tst_res(TINFO, "Test capset() for a different process");
34
35	header->pid = child_pid;
36
37	TST_EXP_FAIL(tst_syscall(__NR_capset, header, data), EPERM, "capset()");
38
39	SAFE_KILL(child_pid, SIGTERM);
40	SAFE_WAIT(NULL);
41}
42
43static void setup(void)
44{
45	header->version = 0x20080522;
46	TEST(tst_syscall(__NR_capget, header, data));
47	if (TST_RET == -1)
48		tst_brk(TBROK | TTERRNO, "capget data failed");
49}
50
51static struct tst_test test = {
52	.setup = setup,
53	.test_all = verify_capset,
54	.forks_child = 1,
55	.bufs = (struct tst_buffers []) {
56		{&header, .size = sizeof(*header)},
57		{&data, .size = 2 * sizeof(*data)},
58		{},
59	}
60};
61