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1 /*
2  * Check decoding of chown/chown32/lchown/lchown32/fchown/fchown32 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 #include <fcntl.h>
32 #include <stdio.h>
33 #include <unistd.h>
34
35 #ifdef UGID_TYPE_IS_SHORT
36 # define UGID_TYPE      short
37 # define GETEUID        syscall(__NR_geteuid)
38 # define GETEGID        syscall(__NR_getegid)
39 # define CHECK_OVERFLOWUID(arg) check_overflowuid(arg)
40 # define CHECK_OVERFLOWGID(arg) check_overflowgid(arg)
41 #else
42 # define UGID_TYPE      int
43 # define GETEUID        geteuid()
44 # define GETEGID        getegid()
45 # define CHECK_OVERFLOWUID(arg)
46 # define CHECK_OVERFLOWGID(arg)
47 #endif
48
49 #define UNLINK_SAMPLE                                   \
50         do {                                            \
51                 if (unlink(sample))                     \
52                         perror_msg_and_fail("unlink");  \
53         } while (0)
54
55 #define CLOSE_SAMPLE                                    \
56         do {                                            \
57                 if (close(fd))                          \
58                         perror_msg_and_fail("close");   \
59         } while (0)
60
61 #ifdef ACCESS_BY_DESCRIPTOR
62 # define SYSCALL_ARG1 fd
63 # define FMT_ARG1 "%d"
64 # define EOK_CMD CLOSE_SAMPLE
65 # define CLEANUP_CMD UNLINK_SAMPLE
66 #else
67 # define SYSCALL_ARG1 sample
68 # define FMT_ARG1 "\"%s\""
69 # define EOK_CMD UNLINK_SAMPLE
70 # define CLEANUP_CMD CLOSE_SAMPLE
71 #endif
72
73 static int
74 ugid2int(const unsigned UGID_TYPE id)
75 {
76         if ((unsigned UGID_TYPE) -1U == id)
77                 return -1;
78         else
79                 return id;
80 }
81
82 static void
83 print_int(const unsigned int num)
84 {
85         if (num == -1U)
86                 printf(", -1");
87         else
88                 printf(", %u", num);
89 }
90
91 static int
92 num_matches_id(const unsigned int num, const unsigned int id)
93 {
94         return num == id || num == -1U;
95 }
96
97 #define PAIR(val)       { val, gid }, { uid, val }
98
99 int
100 main(void)
101 {
102         static const char sample[] = SYSCALL_NAME "_sample";
103
104         unsigned int uid = GETEUID;
105         CHECK_OVERFLOWUID(uid);
106         unsigned int gid = GETEGID;
107         CHECK_OVERFLOWUID(gid);
108
109         const struct {
110                 const long uid, gid;
111         } tests[] = {
112                 { uid, gid },
113                 { (unsigned long) 0xffffffff00000000ULL | uid, gid },
114                 { uid, (unsigned long) 0xffffffff00000000ULL | gid },
115                 PAIR(-1U),
116                 PAIR(-1L),
117                 { 0xffff0000U | uid, gid },
118                 { uid, 0xffff0000U | gid },
119                 PAIR(0xffff),
120                 PAIR(0xc0deffffU),
121                 PAIR(0xfacefeedU),
122                 PAIR((long) 0xfacefeeddeadbeefULL)
123         };
124
125         int fd = open(sample, O_RDONLY | O_CREAT, 0400);
126         if (fd < 0)
127                 perror_msg_and_fail("open");
128
129         CLEANUP_CMD;
130
131         unsigned int i;
132         long expected = 0;
133
134         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
135                 const unsigned int unum = ugid2int(tests[i].uid);
136                 const unsigned int gnum = ugid2int(tests[i].gid);
137
138                 if (num_matches_id(unum, uid) &&
139                     num_matches_id(gnum, gid)) {
140                         if (expected)
141                                 continue;
142                 } else {
143                         if (!expected) {
144                                 expected = -1;
145                                 EOK_CMD;
146                         }
147                 }
148
149                 const long rc = syscall(SYSCALL_NR, SYSCALL_ARG1,
150                                         tests[i].uid, tests[i].gid);
151                 const char *errstr = sprintrc(rc);
152                 printf("%s(" FMT_ARG1, SYSCALL_NAME, SYSCALL_ARG1);
153                 print_int(unum);
154                 print_int(gnum);
155                 printf(") = %s\n", errstr);
156         }
157
158         puts("+++ exited with 0 +++");
159         return 0;
160 }