1 | /* Test that failing system calls do set errno to the correct value. |
2 | |
3 | Copyright (C) 2017-2024 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" |
171 | |