1/*
2 * Check decoding of lookup_dcookie syscall.
3 *
4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "tests.h"
31
32#include <asm/unistd.h>
33
34#ifdef __NR_lookup_dcookie
35
36# include <inttypes.h>
37# include <limits.h>
38# include <stdio.h>
39# include <unistd.h>
40
41static void
42do_lookup_cookie(uint64_t cookie, char *buf, kernel_ulong_t len)
43{
44	long rc;
45	const char *errstr;
46
47# if (LONG_MAX > INT_MAX) \
48  || (defined __x86_64__ && defined __ILP32__) \
49  || defined LINUX_MIPSN32
50	rc = syscall(__NR_lookup_dcookie, cookie, buf, len);
51# else
52	rc = syscall(__NR_lookup_dcookie, LL_VAL_TO_PAIR(cookie), buf, len);
53# endif
54
55	errstr = sprintrc(rc);
56	printf("lookup_dcookie(%" PRIu64 ", ", cookie);
57
58	/* Here, we trust successful return code */
59	if ((rc >= 0) && (rc < (long) INT_MAX)) {
60		printf("%.*s, ", (int) rc, buf);
61	} else {
62		if (buf != NULL)
63			printf("%p, ", buf);
64		else
65			printf("NULL, ");
66	}
67
68	printf("%" PRIu64 ") = %s\n", (uint64_t) len, errstr);
69}
70
71int
72main(void)
73{
74	enum { BUF_SIZE = 4096 };
75
76	static const uint64_t bogus_cookie =
77		(uint64_t) 0xf157feeddeadfaceULL;
78	static const kernel_ulong_t bogus_len =
79		(kernel_ulong_t) 0xbadc0dedda7a1057ULL;
80
81	char *buf = tail_alloc(BUF_SIZE);
82
83	do_lookup_cookie(0, NULL, 0);
84	do_lookup_cookie(bogus_cookie, buf + BUF_SIZE, bogus_len);
85	do_lookup_cookie(bogus_cookie, buf, BUF_SIZE);
86
87	puts("+++ exited with 0 +++");
88
89	return 0;
90}
91
92#else
93
94SKIP_MAIN_UNDEFINED("__NR_lookup_dcookie");
95
96#endif
97