1/* $NetBSD: t_dup.c,v 1.10 2024/05/20 00:27:53 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jukka Ruohonen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31#include <sys/cdefs.h> 32__RCSID("$NetBSD: t_dup.c,v 1.10 2024/05/20 00:27:53 christos Exp $"); 33 34#include <sys/resource.h> 35#include <sys/stat.h> 36#include <sys/wait.h> 37 38#include <atf-c.h> 39#include <errno.h> 40#include <fcntl.h> 41#include <limits.h> 42#include <stdbool.h> 43#include <stdio.h> 44#include <stdlib.h> 45#include <string.h> 46#include <unistd.h> 47#include <sysexits.h> 48 49static char path[] = "dup"; 50static void check_mode(bool, bool, bool); 51 52static void 53check_mode(bool _dup, bool _dup2, bool _dup3) 54{ 55 int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR }; 56 int perm[5] = { 0700, 0400, 0600, 0444, 0666 }; 57 struct stat st, st1; 58 int fd, fd1, fd2; 59 size_t i, j; 60 61 /* 62 * Check that a duplicated descriptor 63 * retains the mode of the original file. 64 */ 65 for (i = 0; i < __arraycount(mode); i++) { 66 67 for (j = 0; j < __arraycount(perm); j++) { 68 69 fd1 = open(path, mode[i] | O_CREAT, perm[j]); 70 fd2 = open("/etc/passwd", O_RDONLY); 71 72 ATF_REQUIRE(fd1 >= 0); 73 ATF_REQUIRE(fd2 >= 0); 74 75 if (_dup != false) 76 fd = dup(fd1); 77 else if (_dup2 != false) 78 fd = dup2(fd1, fd2); 79 else if (_dup3 != false) 80 fd = dup3(fd1, fd2, O_CLOEXEC); 81 else { 82 fd = -1; 83 } 84 85 ATF_REQUIRE(fd >= 0); 86 87 (void)memset(&st, 0, sizeof(struct stat)); 88 (void)memset(&st1, 0, sizeof(struct stat)); 89 90 ATF_REQUIRE(fstat(fd, &st) == 0); 91 ATF_REQUIRE(fstat(fd1, &st1) == 0); 92 93 if (st.st_mode != st1.st_mode) 94 atf_tc_fail("invalid mode"); 95 96 (void)close(fd); 97 (void)close(fd1); 98 (void)close(fd2); 99 (void)unlink(path); 100 } 101 } 102} 103 104ATF_TC(dup2_basic); 105ATF_TC_HEAD(dup2_basic, tc) 106{ 107 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)"); 108} 109 110ATF_TC_BODY(dup2_basic, tc) 111{ 112 int fd, fd1, fd2; 113 114 fd1 = open("/etc/passwd", O_RDONLY); 115 fd2 = open("/etc/passwd", O_RDONLY); 116 117 ATF_REQUIRE(fd1 >= 0); 118 ATF_REQUIRE(fd2 >= 0); 119 120 fd = dup2(fd1, fd2); 121 ATF_REQUIRE(fd >= 0); 122 123 if (fd != fd2) 124 atf_tc_fail("invalid descriptor"); 125 126 (void)close(fd); 127 (void)close(fd1); 128 129 ATF_REQUIRE(close(fd2) != 0); 130} 131 132ATF_TC(dup2_err); 133ATF_TC_HEAD(dup2_err, tc) 134{ 135 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)"); 136} 137 138ATF_TC_BODY(dup2_err, tc) 139{ 140 int fd; 141 142 fd = open("/etc/passwd", O_RDONLY); 143 ATF_REQUIRE(fd >= 0); 144 145 errno = 0; 146 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1); 147 148 errno = 0; 149 ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1); 150 151 errno = 0; 152 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1); 153 154 /* 155 * Note that this should not fail with EINVAL. 156 */ 157 ATF_REQUIRE(dup2(fd, fd) != -1); 158 159 (void)close(fd); 160} 161 162ATF_TC(dup2_max); 163ATF_TC_HEAD(dup2_max, tc) 164{ 165 atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits"); 166} 167 168ATF_TC_BODY(dup2_max, tc) 169{ 170 struct rlimit res; 171 172 (void)memset(&res, 0, sizeof(struct rlimit)); 173 (void)getrlimit(RLIMIT_NOFILE, &res); 174 175 errno = 0; 176 ATF_REQUIRE_ERRNO(EBADF, dup2(STDERR_FILENO, res.rlim_cur + 1) == -1); 177} 178 179ATF_TC_WITH_CLEANUP(dup2_mode); 180ATF_TC_HEAD(dup2_mode, tc) 181{ 182 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)"); 183} 184 185ATF_TC_BODY(dup2_mode, tc) 186{ 187 check_mode(false, true, false); 188} 189 190ATF_TC_CLEANUP(dup2_mode, tc) 191{ 192 (void)unlink(path); 193} 194 195 196ATF_TC(dup3_err); 197ATF_TC_HEAD(dup3_err, tc) 198{ 199 atf_tc_set_md_var(tc, "descr", 200 "Test error conditions of dup3(2) (PR lib/45148)"); 201} 202 203ATF_TC_BODY(dup3_err, tc) 204{ 205 int fd; 206 207 fd = open("/etc/passwd", O_RDONLY); 208 ATF_REQUIRE(fd >= 0); 209 210 errno = 0; 211 ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, fd, O_CLOEXEC) == -1); 212 213 errno = 0; 214 ATF_REQUIRE_ERRNO(EINVAL, dup3(-1, -1, O_CLOEXEC) == -1); 215 216 errno = 0; 217 ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1); 218 219 errno = 0; 220 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1); 221 222 errno = 0; 223 ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1); 224 225 (void)close(fd); 226} 227 228ATF_TC(dup3_max); 229ATF_TC_HEAD(dup3_max, tc) 230{ 231 atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits"); 232} 233 234ATF_TC_BODY(dup3_max, tc) 235{ 236 struct rlimit res; 237 238 (void)memset(&res, 0, sizeof(struct rlimit)); 239 (void)getrlimit(RLIMIT_NOFILE, &res); 240 241 errno = 0; 242 ATF_REQUIRE_ERRNO(EBADF, dup3(STDERR_FILENO, 243 res.rlim_cur + 1, O_CLOEXEC) == -1); 244} 245 246ATF_TC_WITH_CLEANUP(dup3_mode); 247ATF_TC_HEAD(dup3_mode, tc) 248{ 249 atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)"); 250} 251 252ATF_TC_BODY(dup3_mode, tc) 253{ 254 check_mode(false, false, true); 255} 256 257ATF_TC_CLEANUP(dup3_mode, tc) 258{ 259 (void)unlink(path); 260} 261 262ATF_TC(dup_err); 263ATF_TC_HEAD(dup_err, tc) 264{ 265 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)"); 266} 267 268ATF_TC_BODY(dup_err, tc) 269{ 270 271 errno = 0; 272 ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1); 273} 274 275ATF_TC_WITH_CLEANUP(dup_max); 276ATF_TC_HEAD(dup_max, tc) 277{ 278 atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits"); 279} 280 281ATF_TC_BODY(dup_max, tc) 282{ 283 struct rlimit res; 284 int *buf, fd, sta; 285 size_t i, n; 286 pid_t pid; 287 288 pid = fork(); 289 ATF_REQUIRE(pid >= 0); 290 291 if (pid == 0) { 292 293 /* 294 * Open a temporary file until the 295 * maximum number of open files is 296 * reached. Ater that dup(2) family 297 * should fail with EMFILE. 298 */ 299 (void)closefrom(0); 300 (void)memset(&res, 0, sizeof(struct rlimit)); 301 302 n = 10; 303 res.rlim_cur = res.rlim_max = n; 304 if (setrlimit(RLIMIT_NOFILE, &res) != 0) 305 _exit(EX_OSERR); 306 307 buf = calloc(n, sizeof(int)); 308 309 if (buf == NULL) 310 _exit(EX_OSERR); 311 312 buf[0] = mkstemp(path); 313 314 if (buf[0] < 0) 315 _exit(EX_OSERR); 316 317 for (i = 1; i < n; i++) { 318 319 buf[i] = open(path, O_RDONLY); 320 321 if (buf[i] < 0) 322 _exit(EX_OSERR); 323 } 324 325 errno = 0; 326 fd = dup(buf[0]); 327 328 if (fd != -1 || errno != EMFILE) 329 _exit(EX_DATAERR); 330 331 _exit(EXIT_SUCCESS); 332 } 333 334 (void)wait(&sta); 335 336 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 337 338 if (WEXITSTATUS(sta) == EX_OSERR) 339 atf_tc_fail("system call error"); 340 341 if (WEXITSTATUS(sta) == EX_DATAERR) 342 atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE"); 343 344 atf_tc_fail("unknown error"); 345 } 346 347 (void)unlink(path); 348} 349 350ATF_TC_CLEANUP(dup_max, tc) 351{ 352 (void)unlink(path); 353} 354 355ATF_TC_WITH_CLEANUP(dup_mode); 356ATF_TC_HEAD(dup_mode, tc) 357{ 358 atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)"); 359} 360 361ATF_TC_BODY(dup_mode, tc) 362{ 363 check_mode(true, false, false); 364} 365 366ATF_TC_CLEANUP(dup_mode, tc) 367{ 368 (void)unlink(path); 369} 370 371ATF_TP_ADD_TCS(tp) 372{ 373 374 ATF_TP_ADD_TC(tp, dup2_basic); 375 ATF_TP_ADD_TC(tp, dup2_err); 376 ATF_TP_ADD_TC(tp, dup2_max); 377 ATF_TP_ADD_TC(tp, dup2_mode); 378 ATF_TP_ADD_TC(tp, dup3_err); 379 ATF_TP_ADD_TC(tp, dup3_max); 380 ATF_TP_ADD_TC(tp, dup3_mode); 381 ATF_TP_ADD_TC(tp, dup_err); 382 ATF_TP_ADD_TC(tp, dup_max); 383 ATF_TP_ADD_TC(tp, dup_mode); 384 385 return atf_no_error(); 386} 387