1 /* Test that failing system calls do set errno to the correct value.
2
3 Copyright (C) 2017-2023 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20 #include <sys/cdefs.h>
21 #include <libc-diag.h>
22 #if __GNUC_PREREQ (7, 0)
23 /* Triggered by getgroup fortify wrapper. */
24 DIAG_IGNORE_NEEDS_COMMENT (7, "-Wstringop-overflow");
25 #endif
26
27 #include <errno.h>
28 #include <limits.h>
29 #include <grp.h>
30 #include <fcntl.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <sys/ioctl.h>
34 #include <sys/socket.h>
35 #include <sys/stat.h>
36 #include <sys/time.h>
37 #include <sys/resource.h>
38 #include <sys/types.h>
39 #include <sys/statfs.h>
40 #include <sys/mman.h>
41 #include <sys/uio.h>
42 #include <unistd.h>
43 #include <netinet/in.h>
44
45 /* This is not an exhaustive test: only system calls that can be
46 persuaded to fail with a consistent error code and no side effects
47 are included. Usually these are failures due to invalid arguments,
48 with errno code EBADF or EINVAL. The order of argument checks is
49 unspecified, so we must take care to provide arguments that only
50 allow _one_ failure mode.
51
52 Note that all system calls that can fail with EFAULT are permitted
53 to deliver a SIGSEGV signal instead, so we avoid supplying invalid
54 pointers in general, and we do not attempt to test system calls
55 that can only fail with EFAULT (e.g. gettimeofday, gethostname).
56
57 Also note that root-only system calls (e.g. acct, reboot) may, when
58 the test is run as an unprivileged user, fail due to insufficient
59 privileges before bothering to do argument checks, so those are not
60 tested either.
61
62 Also, system calls that take enum or a set of flags as argument is
63 not tested if POSIX doesn't specify exact binary values for all
64 flags, and so any value passed to flags may become valid.
65
66 Some tests assume "/bin/sh" names a file that exists and is not a
67 directory. */
68
69 #define test_wrp_rv(rtype, prtype, experr, syscall, ...) \
70 (__extension__ ({ \
71 errno = 0xdead; \
72 rtype ret = syscall (__VA_ARGS__); \
73 int err = errno; \
74 int fail; \
75 if (ret == (rtype) -1 && err == experr) \
76 fail = 0; \
77 else \
78 { \
79 fail = 1; \
80 if (ret != (rtype) -1) \
81 printf ("FAIL: " #syscall ": didn't fail as expected" \
82 " (return "prtype")\n", ret); \
83 else if (err == 0xdead) \
84 puts("FAIL: " #syscall ": didn't update errno\n"); \
85 else if (err != experr) \
86 printf ("FAIL: " #syscall \
87 ": errno is: %d (%s) expected: %d (%s)\n", \
88 err, strerror (err), experr, strerror (experr)); \
89 } \
90 fail; \
91 }))
92
93 #define test_wrp(experr, syscall, ...) \
94 test_wrp_rv(int, "%d", experr, syscall, __VA_ARGS__)
95
96 static int
97 do_test (void)
98 {
99 size_t pagesize = sysconf (_SC_PAGESIZE);
100 struct statfs sfs;
101 struct sockaddr sa;
102 socklen_t sl;
103 char buf[1];
104 struct iovec iov[1] = { { buf, 1 } };
105 struct sockaddr_in sin;
106 sin.sin_family = AF_INET;
107 sin.sin_port = htons (1026);
108 sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
109 struct msghdr msg;
110 memset(&msg, 0, sizeof msg);
111 msg.msg_iov = iov;
112 msg.msg_iovlen = 1;
113
114 int fails = 0;
115 fails |= test_wrp (EBADF, accept, -1, &sa, &sl);
116 fails |= test_wrp (EINVAL, access, "/", -1);
117 fails |= test_wrp (EBADF, bind, -1, (struct sockaddr *)&sin, sizeof sin);
118 fails |= test_wrp (ENOTDIR, chdir, "/bin/sh");
119 fails |= test_wrp (EBADF, close, -1);
120 fails |= test_wrp (EBADF, connect, -1, (struct sockaddr *)&sin, sizeof sin);
121 fails |= test_wrp (EBADF, dup, -1);
122 fails |= test_wrp (EBADF, dup2, -1, -1);
123 fails |= test_wrp (EBADF, fchdir, -1);
124 fails |= test_wrp (EBADF, fchmod, -1, 0);
125 fails |= test_wrp (EBADF, fcntl, -1, 0);
126 fails |= test_wrp (EBADF, fstatfs, -1, &sfs);
127 fails |= test_wrp (EBADF, fsync, -1);
128 fails |= test_wrp (EBADF, ftruncate, -1, 0);
129
130 #if __GNUC_PREREQ (7, 0)
131 DIAG_PUSH_NEEDS_COMMENT;
132 /* Avoid warnings about the second (size) argument being negative. */
133 DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wstringop-overflow");
134 #endif
135 fails |= test_wrp (EINVAL, getgroups, -1, 0);
136 #if __GNUC_PREREQ (7, 0)
137 DIAG_POP_NEEDS_COMMENT;
138 #endif
139 fails |= test_wrp (EBADF, getpeername, -1, &sa, &sl);
140 fails |= test_wrp (EBADF, getsockname, -1, &sa, &sl);
141 fails |= test_wrp (EBADF, getsockopt, -1, 0, 0, buf, &sl);
142 fails |= test_wrp (EBADF, ioctl, -1, TIOCNOTTY);
143 fails |= test_wrp (EBADF, listen, -1, 1);
144 fails |= test_wrp (EBADF, lseek, -1, 0, 0);
145 fails |= test_wrp (EINVAL, madvise, (void *) -1, -1, 0);
146 fails |= test_wrp_rv (void *, "%p", EBADF,
147 mmap, 0, pagesize, PROT_READ, MAP_PRIVATE, -1, 0);
148 fails |= test_wrp (EINVAL, mprotect, (void *) -1, pagesize, -1);
149 fails |= test_wrp (EINVAL, msync, (void *) -1, pagesize, -1);
150 fails |= test_wrp (EINVAL, munmap, (void *) -1, 0);
151 fails |= test_wrp (EISDIR, open, "/bin", EISDIR, O_WRONLY);
152 fails |= test_wrp (EBADF, read, -1, buf, 1);
153 fails |= test_wrp (EINVAL, readlink, "/", buf, sizeof buf);
154 fails |= test_wrp (EBADF, readv, -1, iov, 1);
155 fails |= test_wrp (EBADF, recv, -1, buf, 1, 0);
156 fails |= test_wrp (EBADF, recvfrom, -1, buf, 1, 0, &sa, &sl);
157 fails |= test_wrp (EBADF, recvmsg, -1, &msg, 0);
158 fails |= test_wrp (EINVAL, select, -1, 0, 0, 0, 0);
159 fails |= test_wrp (EBADF, send, -1, buf, 1, 0);
160 fails |= test_wrp (EBADF, sendmsg, -1, &msg, 0);
161 fails |= test_wrp (EBADF, sendto, -1, buf, 1, 0, &sa, sl);
162 fails |= test_wrp (EBADF, setsockopt, -1, 0, 0, buf, sizeof (*buf));
163 fails |= test_wrp (EBADF, shutdown, -1, SHUT_RD);
164 fails |= test_wrp (EBADF, write, -1, "Hello", sizeof ("Hello") );
165 fails |= test_wrp (EBADF, writev, -1, iov, 1 );
166
167 return fails;
168 }
169
170 #include "support/test-driver.c"