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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) International Business Machines Corp., 200i1
4  * Copyright (c) 2018 Xiao Yang <yangx.jy@cn.fujitsu.com>
5  */
6 
7 /*
8  * DESCRIPTION
9  * 1) Call sysctl(2) with nlen set to 0, and expect ENOTDIR.
10  * 2) Call sysctl(2) with nlen greater than CTL_MAXNAME, and expect ENOTDIR.
11  * 3) Call sysctl(2) with the address of oldname outside the address space of
12  *    the process, and expect EFAULT.
13  * 4) Call sysctl(2) with the address of soldval outside the address space of
14  *    the process, and expect EFAULT.
15  */
16 
17 #include <stdio.h>
18 #include <errno.h>
19 #include <unistd.h>
20 #include <linux/unistd.h>
21 #include <linux/sysctl.h>
22 
23 #include "tst_test.h"
24 #include "lapi/syscalls.h"
25 
26 static char osname[BUFSIZ];
27 static size_t length = BUFSIZ;
28 
29 static struct tcase {
30 	int name[2];
31 	int nlen;
32 	void *oldval;
33 	size_t *oldlen;
34 	int exp_err;
35 } tcases[] = {
36 	{{CTL_KERN, KERN_OSREV}, 0, osname, &length, ENOTDIR},
37 	{{CTL_KERN, KERN_OSREV}, CTL_MAXNAME + 1, osname, &length, ENOTDIR},
38 	{{CTL_KERN, KERN_OSRELEASE}, 2, (void *) -1, &length, EFAULT},
39 	{{CTL_KERN, KERN_VERSION}, 2, osname, (void *) -1, EFAULT},
40 };
41 
verify_sysctl(unsigned int n)42 static void verify_sysctl(unsigned int n)
43 {
44 	struct tcase *tc = &tcases[n];
45 	struct __sysctl_args args = {
46 		.name = tc->name,
47 		.nlen = tc->nlen,
48 		.oldval = tc->oldval,
49 		.oldlenp = tc->oldlen,
50 	};
51 
52 	TEST(tst_syscall(__NR__sysctl, &args));
53 	if (TST_RET != -1) {
54 		tst_res(TFAIL, "sysctl(2) succeeded unexpectedly");
55 		return;
56 	}
57 
58 	if (TST_ERR == tc->exp_err) {
59 		tst_res(TPASS | TTERRNO, "Got expected error");
60 	} else {
61 		tst_res(TFAIL | TTERRNO, "Got unexpected error, expected %s",
62 			tst_strerrno(tc->exp_err));
63 	}
64 }
65 
66 static struct tst_test test = {
67 	.tcnt = ARRAY_SIZE(tcases),
68 	.test = verify_sysctl,
69 };
70