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1/* Test that failing system calls do set errno to the correct value.
2 Linux sycalls version.
3
4 Copyright (C) 2017-2019 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
20
21#include <array_length.h>
22#include <errno.h>
23#include <fcntl.h>
24#include <mqueue.h>
25#include <sched.h>
26#include <signal.h>
27#include <stdbool.h>
28#include <stdio.h>
29#include <string.h>
30#include <time.h>
31#include <unistd.h>
32#include <sys/epoll.h>
33#include <sys/eventfd.h>
34#include <sys/file.h>
35#include <sys/fsuid.h>
36#include <sys/inotify.h>
37#include <sys/mman.h>
38#include <sys/poll.h>
39#include <sys/quota.h>
40#include <sys/resource.h>
41#include <sys/select.h>
42#include <sys/sendfile.h>
43#include <sys/swap.h>
44#include <sys/time.h>
45#include <sys/types.h>
46#include <sys/wait.h>
47
48/* This is not an exhaustive test: only system calls that can be
49 persuaded to fail with a consistent error code and no side effects
50 are included. Usually these are failures due to invalid arguments,
51 with errno code EBADF or EINVAL. The order of argument checks is
52 unspecified, so we must take care to provide arguments that only
53 allow _one_ failure mode.
54
55 Note that all system calls that can fail with EFAULT are permitted
56 to deliver a SIGSEGV signal instead, so we avoid supplying invalid
57 pointers in general, and we do not attempt to test system calls
58 that can only fail with EFAULT (e.g. gettimeofday, gethostname).
59
60 Also note that root-only system calls (e.g. acct, reboot) may, when
61 the test is run as an unprivileged user, fail due to insufficient
62 privileges before bothering to do argument checks, so those are not
63 tested either.
64
65 Also, system calls that take enum or a set of flags as argument is
66 not tested if POSIX doesn't specify exact binary values for all
67 flags, and so any value passed to flags may become valid.
68
69 Some tests assume "/bin/sh" names a file that exists and is not a
70 directory. */
71
72/* Evalutes to the arguments in a list initializer which can be used
73 as a single macro argument. */
74#define LIST(...) { __VA_ARGS__ }
75
76/* This macro is necessary to forward the output of LIST as a macro
77 argument. */
78#define LIST_FORWARD(...) __VA_ARGS__
79
80/* Return true if CODE is contained in the array [CODES, CODES +
81 COUNT]. */
82static bool
83check_error_in_list (int code, int *codes, size_t count)
84{
85 for (size_t i = 0; i < count; ++i)
86 if (codes[i] == code)
87 return true;
88 return false;
89}
90
91#define test_wrp_rv(rtype, prtype, experr_list, syscall, ...) \
92 (__extension__ ({ \
93 errno = 0xdead; \
94 int experr[] = experr_list; \
95 rtype ret = syscall (__VA_ARGS__); \
96 int err = errno; \
97 int fail; \
98 if ((ret == (rtype) -1) \
99 && check_error_in_list (err, experr, array_length (experr))) \
100 fail = 0; \
101 else \
102 { \
103 fail = 1; \
104 if (ret != (rtype) -1) \
105 printf ("FAIL: " #syscall ": didn't fail as expected" \
106 " (return "prtype")\n", ret); \
107 else if (err == 0xdead) \
108 puts ("FAIL: " #syscall ": didn't update errno"); \
109 else \
110 printf ("FAIL: " #syscall \
111 ": errno is: %d (%s) expected one of %s\n", \
112 err, strerror (err), #experr_list); \
113 } \
114 fail; \
115 }))
116
117#define test_wrp(experr, syscall, ...) \
118 test_wrp_rv(int, "%d", LIST (experr), syscall, __VA_ARGS__)
119
120#define test_wrp2(experr, syscall, ...) \
121 test_wrp_rv(int, "%d", LIST_FORWARD (experr), syscall, __VA_ARGS__)
122
123static int
124do_test (void)
125{
126 fd_set rs, ws, es;
127 int status;
128 off_t off;
129 stack_t ss;
130 struct dqblk dqblk;
131 struct epoll_event epoll_event;
132 struct pollfd pollfd;
133 struct sched_param sch_param;
134 struct timespec ts;
135 struct timeval tv;
136 unsigned char vec[16];
137 ss.ss_flags = ~SS_DISABLE;
138 ts.tv_sec = -1;
139
140 int fails = 0;
141 fails |= test_wrp (EINVAL, epoll_create, -1);
142 fails |= test_wrp (EINVAL, epoll_create1, EPOLL_CLOEXEC + 1);
143 fails |= test_wrp (EBADF, epoll_ctl, -1, EPOLL_CTL_ADD, 0, &epoll_event);
144 fails |= test_wrp (EBADF, epoll_wait, -1, &epoll_event, 1, 1);
145 fails |= test_wrp (EBADF, fdatasync, -1);
146 fails |= test_wrp (EBADF, flock, -1, LOCK_SH);
147 fails |= test_wrp (ESRCH, getpgid, -1);
148 /* Linux v3.8 (676a0675c) removed the test to check at least one valid
149 bit in flags (to return EINVAL). It was later added back in v3.9
150 (04df32fa1). */
151 fails |= test_wrp2 (LIST (EINVAL, EBADF), inotify_add_watch, -1, "/", 0);
152 fails |= test_wrp (EINVAL, mincore, (void *) -1, 0, vec);
153 /* mlock fails if the result of the addition addr+len was less than addr
154 (which indicates final address overflow), however on 32 bits binaries
155 running on 64 bits kernels, internal syscall address check won't result
156 in an invalid address and thus syscalls fails later in vma
157 allocation. */
158 fails |= test_wrp2 (LIST (EINVAL, ENOMEM), mlock, (void *) -1, 1);
159 fails |= test_wrp (EINVAL, nanosleep, &ts, &ts);
160 fails |= test_wrp (EINVAL, poll, &pollfd, -1, 0);
161 /* quotactl returns ENOSYS for kernels not configured with
162 CONFIG_QUOTA, and may return EPERM if called within certain types
163 of containers. */
164 fails |= test_wrp2 (LIST (ENODEV, ENOSYS, EPERM),
165 quotactl, Q_GETINFO, NULL, -1, (caddr_t) &dqblk);
166 fails |= test_wrp (EINVAL, sched_getparam, -1, &sch_param);
167 fails |= test_wrp (EINVAL, sched_getscheduler, -1);
168 fails |= test_wrp (EINVAL, sched_get_priority_max, -1);
169 fails |= test_wrp (EINVAL, sched_get_priority_min, -1);
170 fails |= test_wrp (EINVAL, sched_rr_get_interval, -1, &ts);
171 fails |= test_wrp (EINVAL, sched_setparam, -1, &sch_param);
172 fails |= test_wrp (EINVAL, sched_setscheduler, -1, 0, &sch_param);
173 fails |= test_wrp (EINVAL, select, -1, &rs, &ws, &es, &tv);
174 fails |= test_wrp (EBADF, sendfile, -1, -1, &off, 0);
175 fails |= test_wrp (EINVAL, sigaltstack, &ss, NULL);
176 fails |= test_wrp (ECHILD, wait4, -1, &status, 0, NULL);
177
178 return fails;
179}
180
181#include "support/test-driver.c"
182

Warning: That file was not part of the compilation database. It may have many parsing errors.