tests/lib/libc/sys/t_clone.c

   1 /* $NetBSD: t_clone.c,v 1.3 2011/12/12 20:55:44 joerg Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe.
   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
  32 #include <sys/cdefs.h>
  33 __COPYRIGHT("@(#) Copyright (c) 2008\
  34  The NetBSD Foundation, inc. All rights reserved.");
  35 __RCSID("$NetBSD: t_clone.c,v 1.3 2011/12/12 20:55:44 joerg Exp $");
  36
  37 #include <sys/mman.h>
  38 #include <sys/resource.h>
  39 #include <sys/types.h>
  40 #include <sys/wait.h>
  41
  42 #include <errno.h>
  43 #include <sched.h>
  44 #include <signal.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #include <atf-c.h>
  51
  52 #define STACKSIZE       (8 * 1024)
  53 #define FROBVAL         41973
  54 #define CHILDEXIT       0xa5
  55
  56 static int
  57 dummy(void *arg)
  58 {
  59
  60         return 0;
  61 }
  62
  63 static int
  64 clone_func(void *arg)
  65 {
  66         long *frobp = arg, diff;
  67
  68         printf("child: stack ~= %p, frobme = %p\n", &frobp, frobp);
  69         fflush(stdout);
  70
  71         if (frobp[0] != getppid())
  72                 return 1;
  73
  74         if (frobp[0] == getpid())
  75                 return 2;
  76
  77         diff = labs(frobp[1] - (long) &frobp);
  78
  79         if (diff > 1024)
  80                 return 3;
  81
  82         frobp[1] = FROBVAL;
  83
  84         return (CHILDEXIT);
  85 }
  86
  87 ATF_TC(clone_basic);
  88 ATF_TC_HEAD(clone_basic, tc)
  89 {
  90
  91         atf_tc_set_md_var(tc, "descr", "Checks clone(2)");
  92 }
  93
  94 ATF_TC_BODY(clone_basic, tc)
  95 {
  96         sigset_t mask;
  97         void *allocstack, *stack;
  98         pid_t pid;
  99         volatile long frobme[2];
 100         int stat;
 101
 102         allocstack = mmap(NULL, STACKSIZE, PROT_READ|PROT_WRITE|PROT_EXEC,
 103             MAP_PRIVATE|MAP_ANON, -1, (off_t) 0);
 104
 105         ATF_REQUIRE_ERRNO(errno, allocstack != MAP_FAILED);
 106
 107         stack = allocstack;
 108 #ifndef __MACHINE_STACK_GROWS_UP
 109         stack = (char *)stack + STACKSIZE;
 110 #endif
 111
 112         printf("parent: stack = %p, frobme = %p\n", stack, frobme);
 113         fflush(stdout);
 114
 115         frobme[0] = (long)getpid();
 116         frobme[1] = (long)stack;
 117
 118         sigemptyset(&mask);
 119         sigaddset(&mask, SIGUSR1);
 120
 121         ATF_REQUIRE_ERRNO(errno, sigprocmask(SIG_BLOCK, &mask, NULL) != -1);
 122
 123         switch (pid = __clone(clone_func, stack,
 124             CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|SIGUSR1,
 125             __UNVOLATILE(frobme))) {
 126         case 0:
 127                 atf_tc_fail("clone() returned 0");
 128                 /*NOTREACHED*/
 129         case -1:
 130                 atf_tc_fail("clone() failed: %s", strerror(errno));
 131                 /*NOTREACHED*/
 132         default:
 133                 while (waitpid(pid, &stat, __WCLONE) != pid)
 134                         continue;
 135         }
 136
 137         ATF_REQUIRE_MSG(WIFEXITED(stat) != 0, "child didn't exit");
 138
 139         printf("parent: childexit = 0x%x, frobme = %ld\n",
 140             WEXITSTATUS(stat), frobme[1]);
 141
 142         switch (WEXITSTATUS(stat)) {
 143         case CHILDEXIT:
 144                 ATF_REQUIRE_EQ(frobme[1], FROBVAL);
 145                 break;
 146         case 1:
 147                 atf_tc_fail("child: argument does not contain parent's pid");
 148                 /*NOTREACHED*/
 149         case 2:
 150                 atf_tc_fail("child: called in parent's pid");
 151                 /*NOTREACHED*/
 152         case 3:
 153                 atf_tc_fail("child: called with bad stack");
 154                 /*NOTREACHED*/
 155         default:
 156                 atf_tc_fail("child returned unknown code: %d",
 157                     WEXITSTATUS(stat));
 158                 /*NOTREACHED*/
 159         }
 160
 161         ATF_REQUIRE_ERRNO(errno, munmap(allocstack, STACKSIZE) != -1);
 162 }
 163
 164 ATF_TC(clone_null_stack);
 165 ATF_TC_HEAD(clone_null_stack, tc)
 166 {
 167
 168         atf_tc_set_md_var(tc, "descr",
 169             "Checks that clone(2) fails when stack pointer is NULL");
 170 }
 171
 172 ATF_TC_BODY(clone_null_stack, tc)
 173 {
 174         int rv;
 175
 176         rv = __clone(dummy, NULL,
 177             CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|SIGCHLD, NULL);
 178
 179         ATF_REQUIRE_EQ(rv, -1);
 180         ATF_REQUIRE_EQ(errno, EINVAL);
 181 }
 182
 183 ATF_TC(clone_null_func);
 184 ATF_TC_HEAD(clone_null_func, tc)
 185 {
 186
 187         atf_tc_set_md_var(tc, "descr",
 188             "Checks that clone(2) fails when function pointer is NULL");
 189 }
 190
 191 ATF_TC_BODY(clone_null_func, tc)
 192 {
 193         void *allocstack, *stack;
 194         int rv;
 195
 196         allocstack = mmap(NULL, STACKSIZE, PROT_READ|PROT_WRITE|PROT_EXEC,
 197             MAP_PRIVATE|MAP_ANON, -1, (off_t) 0);
 198         ATF_REQUIRE_ERRNO(errno, allocstack != MAP_FAILED);
 199         stack = allocstack;
 200 #ifndef __MACHINE_STACK_GROWS_UP
 201         stack = (char *)stack + STACKSIZE;
 202 #endif
 203
 204         errno = 0;
 205         rv = __clone(0, stack,
 206             CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|SIGCHLD, NULL);
 207
 208         ATF_REQUIRE_EQ(rv, -1);
 209         ATF_REQUIRE_EQ(errno, EINVAL);
 210
 211         ATF_REQUIRE_ERRNO(errno, munmap(allocstack, STACKSIZE) != -1);
 212 }
 213
 214 ATF_TC(clone_out_of_proc);
 215 ATF_TC_HEAD(clone_out_of_proc, tc)
 216 {
 217
 218         atf_tc_set_md_var(tc, "descr",
 219                 "Checks that clone(2) fails when running out of processes");
 220         atf_tc_set_md_var(tc, "require.user", "unprivileged");
 221 }
 222
 223 ATF_TC_BODY(clone_out_of_proc, tc)
 224 {
 225         struct rlimit rl;
 226         int rv;
 227
 228         ATF_REQUIRE_ERRNO(errno, getrlimit(RLIMIT_NPROC, &rl) != -1);
 229
 230         rl.rlim_cur = 0;
 231         rl.rlim_max = 0;
 232
 233         ATF_REQUIRE_ERRNO(errno, setrlimit(RLIMIT_NPROC, &rl) != -1);
 234
 235         errno = 0;
 236         rv = __clone(dummy, malloc(10240),
 237             CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|SIGCHLD, (void *)&rl);
 238
 239         ATF_REQUIRE_EQ(rv, -1);
 240         ATF_REQUIRE_EQ(errno, EAGAIN);
 241 }
 242
 243 ATF_TP_ADD_TCS(tp)
 244 {
 245
 246         ATF_TP_ADD_TC(tp, clone_basic);
 247         ATF_TP_ADD_TC(tp, clone_null_stack);
 248         ATF_TP_ADD_TC(tp, clone_null_func);
 249         ATF_TP_ADD_TC(tp, clone_out_of_proc);
 250
 251         return atf_no_error();
 252 }