1 /*
2  * Check decoding of setgroups/setgroups32 syscalls.
3  *
4  * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5  * Copyright (c) 2016-2017 The strace developers.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #ifdef __NR_setgroups32
32 
33 # define SYSCALL_NR	__NR_setgroups32
34 # define SYSCALL_NAME	"setgroups32"
35 # define GID_TYPE	unsigned int
36 
37 #else
38 
39 # include "tests.h"
40 # include <asm/unistd.h>
41 
42 # ifdef __NR_setgroups
43 
44 #  define SYSCALL_NR	__NR_setgroups
45 #  define SYSCALL_NAME	"setgroups"
46 #  if defined __NR_setgroups32 && __NR_setgroups != __NR_setgroups32
47 #   define GID_TYPE	unsigned short
48 #  else
49 #   define GID_TYPE	unsigned int
50 #  endif
51 
52 # endif
53 
54 #endif
55 
56 #ifdef GID_TYPE
57 
58 # include <stdio.h>
59 # include <unistd.h>
60 
61 void
62 printuid(GID_TYPE id)
63 {
64 	if (id == (GID_TYPE) -1U)
65 		printf("-1");
66 	else
67 		printf("%u", id);
68 }
69 
70 int
71 main(void)
72 {
73 	const char *errstr;
74 
75 	/* check how the first argument is decoded */
76 	long rc = syscall(SYSCALL_NR, 0, 0);
77 	printf("%s(0, NULL) = %s\n", SYSCALL_NAME, sprintrc(rc));
78 
79 	rc = syscall(SYSCALL_NR, F8ILL_KULONG_MASK, 0);
80 	printf("%s(0, NULL) = %s\n", SYSCALL_NAME, sprintrc(rc));
81 
82 	rc = syscall(SYSCALL_NR, 1, 0);
83 	printf("%s(1, NULL) = %s\n", SYSCALL_NAME, sprintrc(rc));
84 
85 	rc = syscall(SYSCALL_NR, (long) 0xffffffff00000001ULL, 0);
86 	printf("%s(1, NULL) = %s\n", SYSCALL_NAME, sprintrc(rc));
87 
88 	rc = syscall(SYSCALL_NR, -1U, 0);
89 	printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, -1, sprintrc(rc));
90 
91 	rc = syscall(SYSCALL_NR, -1L, 0);
92 	printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, -1, sprintrc(rc));
93 
94 	/* check how the second argument is decoded */
95 	TAIL_ALLOC_OBJECT_CONST_PTR(const GID_TYPE, g1);
96 	GID_TYPE *const g2 = tail_alloc(sizeof(*g2) * 2);
97 	GID_TYPE *const g3 = tail_alloc(sizeof(*g3) * 3);
98 
99 	rc = syscall(SYSCALL_NR, 0, g1 + 1);
100 	printf("%s(0, []) = %s\n", SYSCALL_NAME, sprintrc(rc));
101 
102 	rc = syscall(SYSCALL_NR, 1, g1);
103 	errstr = sprintrc(rc);
104 	printf("%s(1, [", SYSCALL_NAME);
105 	printuid(*g1);
106 	printf("]) = %s\n", errstr);
107 
108 	rc = syscall(SYSCALL_NR, 1, g1 + 1);
109 	printf("%s(1, %p) = %s\n", SYSCALL_NAME, g1 + 1, sprintrc(rc));
110 
111 	rc = syscall(SYSCALL_NR, 1, -1L);
112 	printf("%s(1, %#lx) = %s\n", SYSCALL_NAME, -1L, sprintrc(rc));
113 
114 	rc = syscall(SYSCALL_NR, 2, g1);
115 	errstr = sprintrc(rc);
116 	printf("%s(2, [", SYSCALL_NAME);
117 	printuid(*g1);
118 	printf(", %p]) = %s\n", g1 + 1, errstr);
119 
120 	g2[0] = -2;
121 	g2[1] = -3;
122 	rc = syscall(SYSCALL_NR, 2, g2);
123 	errstr = sprintrc(rc);
124 	printf("%s(2, [", SYSCALL_NAME);
125 	printuid(g2[0]);
126 	printf(", ");
127 	printuid(g2[1]);
128 	printf("]) = %s\n", errstr);
129 
130 	rc = syscall(SYSCALL_NR, 3, g2);
131 	errstr = sprintrc(rc);
132 	printf("%s(3, [", SYSCALL_NAME);
133 	printuid(g2[0]);
134 	printf(", ");
135 	printuid(g2[1]);
136 	printf(", %p]) = %s\n", g2 + 2, errstr);
137 
138 	g3[0] = 0;
139 	g3[1] = 1;
140 	rc = syscall(SYSCALL_NR, 3, g3);
141 	errstr = sprintrc(rc);
142 	printf("%s(3, [", SYSCALL_NAME);
143 	printuid(g3[0]);
144 	printf(", ");
145 	printuid(g3[1]);
146 	printf(", ...]) = %s\n", errstr);
147 
148 	rc = syscall(SYSCALL_NR, 4, g3);
149 	errstr = sprintrc(rc);
150 	printf("%s(4, [", SYSCALL_NAME);
151 	printuid(g3[0]);
152 	printf(", ");
153 	printuid(g3[1]);
154 	printf(", ...]) = %s\n", errstr);
155 
156 	rc = sysconf(_SC_NGROUPS_MAX);
157 	const unsigned ngroups_max = rc;
158 
159 	if ((unsigned long) rc == ngroups_max && (int) ngroups_max > 0) {
160 		rc = syscall(SYSCALL_NR, ngroups_max, g3);
161 		errstr = sprintrc(rc);
162 		printf("%s(%d, [", SYSCALL_NAME, ngroups_max);
163 		printuid(g3[0]);
164 		printf(", ");
165 		printuid(g3[1]);
166 		printf(", ...]) = %s\n", errstr);
167 
168 		rc = syscall(SYSCALL_NR, F8ILL_KULONG_MASK | ngroups_max, g3);
169 		errstr = sprintrc(rc);
170 		printf("%s(%d, [", SYSCALL_NAME, ngroups_max);
171 		printuid(g3[0]);
172 		printf(", ");
173 		printuid(g3[1]);
174 		printf(", ...]) = %s\n", errstr);
175 
176 		rc = syscall(SYSCALL_NR, ngroups_max + 1, g3);
177 		printf("%s(%d, %p) = %s\n", SYSCALL_NAME,
178 		       ngroups_max + 1, g3, sprintrc(rc));
179 	}
180 
181 	puts("+++ exited with 0 +++");
182 	return 0;
183 }
184 
185 #else
186 
187 SKIP_MAIN_UNDEFINED("__NR_setgroups")
188 
189 #endif
190