1 /*- 2 * Copyright (c) 2014 EMC Corp. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/limits.h> 29 #include <sys/resource.h> 30 #include <sys/stat.h> 31 #include <sys/sysctl.h> 32 #include <sys/time.h> 33 #include <sys/wait.h> 34 35 #include <errno.h> 36 #include <fcntl.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <strings.h> 42 #include <unistd.h> 43 44 #include <atf-c.h> 45 46 static volatile sig_atomic_t done; 47 48 #define AFILE "afile" 49 #define EXPANDBY 1000 50 #define PARALLEL 4 51 #define RENDEZVOUS "rendezvous" 52 #define VALUE "value" 53 54 ATF_TC_WITHOUT_HEAD(dup2__simple); 55 ATF_TC_BODY(dup2__simple, tc) 56 { 57 int fd1, fd2; 58 struct stat sb1, sb2; 59 60 ATF_REQUIRE((fd1 = open(AFILE, O_CREAT, 0644)) != -1); 61 fd2 = 27; 62 ATF_REQUIRE(dup2(fd1, fd2) != -1); 63 ATF_REQUIRE(fstat(fd1, &sb1) != -1); 64 ATF_REQUIRE(fstat(fd2, &sb2) != -1); 65 ATF_REQUIRE(bcmp(&sb1, &sb2, sizeof(sb1)) == 0); 66 } 67 68 ATF_TC(dup2__ebadf_when_2nd_arg_out_of_range); 69 ATF_TC_HEAD(dup2__ebadf_when_2nd_arg_out_of_range, tc) 70 { 71 atf_tc_set_md_var(tc, "descr", "Regression test for r234131"); 72 } 73 74 ATF_TC_BODY(dup2__ebadf_when_2nd_arg_out_of_range, tc) 75 { 76 int fd1, fd2, ret; 77 78 ATF_REQUIRE((fd1 = open(AFILE, O_CREAT, 0644)) != -1); 79 fd2 = INT_MAX; 80 ret = dup2(fd1, fd2); 81 ATF_CHECK_EQ(-1, ret); 82 ATF_CHECK_EQ(EBADF, errno); 83 } 84 85 static void 86 handler(int s __unused) 87 { 88 done++; 89 } 90 91 static void 92 openfiles2(size_t n) 93 { 94 size_t i; 95 int r; 96 97 errno = 0; 98 for (i = 0; i < n; i++) { 99 r = open(AFILE, O_RDONLY); 100 if (r < 0) { 101 fprintf(stderr, "open: %s\n", strerror(errno)); 102 _exit(1); 103 } 104 } 105 kill(getppid(), SIGUSR1); 106 107 for (;;) { 108 if (access(RENDEZVOUS, R_OK) != 0) 109 break; 110 usleep(1000); 111 } 112 _exit(0); 113 } 114 115 static void 116 openfiles(size_t n) 117 { 118 int i, fd; 119 120 signal(SIGUSR1, handler); 121 ATF_REQUIRE((fd = open(AFILE, O_CREAT, 0644)) != -1); 122 close(fd); 123 ATF_REQUIRE((fd = open(RENDEZVOUS, O_CREAT, 0644)) != -1); 124 close(fd); 125 done = 0; 126 for (i = 0; i < PARALLEL; i++) 127 if (fork() == 0) 128 openfiles2(n / PARALLEL); 129 while (done != PARALLEL) { 130 usleep(1000); 131 ATF_REQUIRE_EQ_MSG(0, waitpid(-1, NULL, WNOHANG), 132 "a child exited unexpectedly"); 133 } 134 unlink(RENDEZVOUS); 135 for (i = 0; i < PARALLEL; i++) 136 ATF_CHECK_MSG(wait(NULL) > 0, "wait: %s", strerror(errno)); 137 } 138 139 ATF_TC_WITH_CLEANUP(kern_maxfiles__increase); 140 ATF_TC_HEAD(kern_maxfiles__increase, tc) 141 { 142 atf_tc_set_md_var(tc, "require.user", "root"); 143 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects"); 144 atf_tc_set_md_var(tc, "descr", 145 "Check kern.maxfiles expansion"); 146 } 147 148 ATF_TC_BODY(kern_maxfiles__increase, tc) 149 { 150 size_t oldlen; 151 int maxfiles, oldmaxfiles, current; 152 char buf[80]; 153 struct rlimit rl; 154 155 oldlen = sizeof(maxfiles); 156 if (sysctlbyname("kern.maxfiles", &maxfiles, &oldlen, NULL, 0) == -1) 157 atf_tc_fail("getsysctlbyname(%s): %s", "kern.maxfiles", 158 strerror(errno)); 159 if (sysctlbyname("kern.openfiles", ¤t, &oldlen, NULL, 0) == -1) 160 atf_tc_fail("getsysctlbyname(%s): %s", "kern.openfiles", 161 strerror(errno)); 162 163 oldmaxfiles = maxfiles; 164 165 /* Store old kern.maxfiles in a symlink for cleanup */ 166 snprintf(buf, sizeof(buf), "%d", oldmaxfiles); 167 if (symlink(buf, VALUE) == 1) 168 atf_tc_fail("symlink(%s, %s): %s", buf, VALUE, 169 strerror(errno)); 170 171 maxfiles += EXPANDBY; 172 if (sysctlbyname("kern.maxfiles", NULL, 0, &maxfiles, oldlen) == -1) 173 atf_tc_fail("getsysctlbyname(%s): %s", "kern.maxfiles", 174 strerror(errno)); 175 176 rl.rlim_cur = rl.rlim_max = maxfiles; 177 ATF_REQUIRE_EQ_MSG(0, setrlimit(RLIMIT_NOFILE, &rl), 178 "setrlimit(RLIMIT_NOFILE, %d): %s", maxfiles, strerror(errno)); 179 180 openfiles(oldmaxfiles - current + EXPANDBY / 2); 181 } 182 183 ATF_TC_CLEANUP(kern_maxfiles__increase, tc) 184 { 185 size_t oldlen; 186 int n, oldmaxfiles; 187 char buf[80]; 188 189 if ((n = readlink(VALUE, buf, sizeof(buf))) > 0) { 190 buf[MIN((size_t)n, sizeof(buf) - 1)] = '\0'; 191 if (sscanf(buf, "%d", &oldmaxfiles) == 1) { 192 oldlen = sizeof(oldmaxfiles); 193 (void) sysctlbyname("kern.maxfiles", NULL, 0, 194 &oldmaxfiles, oldlen); 195 } 196 } 197 (void)unlink(VALUE); 198 (void)unlink(AFILE); 199 } 200 201 ATF_TP_ADD_TCS(tp) 202 { 203 204 ATF_TP_ADD_TC(tp, dup2__simple); 205 ATF_TP_ADD_TC(tp, dup2__ebadf_when_2nd_arg_out_of_range); 206 ATF_TP_ADD_TC(tp, kern_maxfiles__increase); 207 208 return (atf_no_error()); 209 } 210