1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) 2017 Xiao Yang <yangx.jy@cn.fujitsu.com>
5 */
6
7/*
8 * DESCRIPTION
9 *  1) Test for EPERM when the super-user tries to increase RLIMIT_NOFILE
10 *     beyond the system limit.
11 *  2) Test for EINVAL when rlim->rlim_cur is greater than rlim->rlim_max.
12 */
13
14#include <errno.h>
15#include <sys/time.h>
16#include <sys/resource.h>
17#include <linux/fs.h>
18#include "tst_test.h"
19
20#if !defined(NR_OPEN)
21// Taken from definition in /usr/include/linux/fs.h
22# define NR_OPEN (1024*1024)
23#endif
24
25#define NR_OPEN_PATH "/proc/sys/fs/nr_open"
26
27static struct rlimit rlim1, rlim2;
28static unsigned int nr_open = NR_OPEN;
29
30static struct tcase {
31	struct rlimit *rlimt;
32	int exp_err;
33} tcases[] = {
34	{&rlim1, EPERM},
35	{&rlim2, EINVAL}
36};
37
38static void verify_setrlimit(unsigned int n)
39{
40	struct tcase *tc = &tcases[n];
41
42	TEST(setrlimit(RLIMIT_NOFILE, tc->rlimt));
43	if (TST_RET != -1) {
44		tst_res(TFAIL, "call succeeded unexpectedly "
45			"(nr_open=%u rlim_cur=%lu rlim_max=%lu)", nr_open,
46			(unsigned long)(tc->rlimt->rlim_cur),
47			(unsigned long)(tc->rlimt->rlim_max));
48		return;
49	}
50
51	if (TST_ERR != tc->exp_err) {
52		tst_res(TFAIL | TTERRNO, "setrlimit() should fail with %s, got",
53			tst_strerrno(tc->exp_err));
54	} else {
55		tst_res(TPASS | TTERRNO, "setrlimit() failed as expected");
56	}
57}
58
59static void setup(void)
60{
61	if (!access(NR_OPEN_PATH, F_OK))
62		SAFE_FILE_SCANF(NR_OPEN_PATH, "%u", &nr_open);
63
64	SAFE_GETRLIMIT(RLIMIT_NOFILE, &rlim1);
65	rlim2.rlim_max = rlim1.rlim_cur;
66	rlim2.rlim_cur = rlim1.rlim_max + 1;
67	rlim1.rlim_max = nr_open + 1;
68}
69
70static struct tst_test test = {
71	.setup = setup,
72	.tcnt = ARRAY_SIZE(tcases),
73	.test = verify_setrlimit,
74	.needs_root = 1
75};
76