lib/roken/test-mem.c

   1 /*
   2  * Copyright (c) 1999 - 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37 #ifdef HAVE_SYS_MMAN_H
  38 #include <sys/mman.h>
  39 #endif
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <err.h>
  43 #include "roken.h"
  44
  45 #include "test-mem.h"
  46
  47 RCSID("$Id$");
  48
  49 /* #undef HAVE_MMAP */
  50
  51 struct {
  52     void *start;
  53     size_t size;
  54     void *data_start;
  55     size_t data_size;
  56     enum rk_test_mem_type type;
  57     int fd;
  58 } map;
  59
  60 struct sigaction sa, osa;
  61
  62 char *testname;
  63
  64 static RETSIGTYPE
  65 segv_handler(int sig)
  66 {
  67     int fd;
  68     char msg[] = "SIGSEGV i current test: ";
  69
  70     fd = open("/dev/stdout", O_WRONLY, 0600);
  71     if (fd >= 0) {
  72         write(fd, msg, sizeof(msg) - 1);
  73         write(fd, testname, strlen(testname));
  74         write(fd, "\n", 1);
  75         close(fd);
  76     }
  77     _exit(1);
  78 }
  79
  80 #define TESTREC()                                                       \
  81     if (testname)                                                       \
  82         errx(1, "test %s run recursively on %s", name, testname);       \
  83     testname = strdup(name);                                            \
  84     if (testname == NULL)                                               \
  85         errx(1, "malloc");
  86
  87
  88 void * ROKEN_LIB_FUNCTION
  89 rk_test_mem_alloc(enum rk_test_mem_type type, const char *name,
  90                   void *buf, size_t size)
  91 {
  92 #ifndef HAVE_MMAP
  93     unsigned char *p;
  94
  95     TESTREC();
  96
  97     p = malloc(size + 2);
  98     if (p == NULL)
  99         errx(1, "malloc");
 100     map.type = type;
 101     map.start = p;
 102     map.size = size + 2;
 103     p[0] = 0xff;
 104     p[map.size] = 0xff;
 105     map.data_start = p + 1;
 106 #else
 107     unsigned char *p;
 108     int flags, ret, fd;
 109     size_t pagesize = getpagesize();
 110
 111     TESTREC();
 112
 113     map.type = type;
 114
 115 #ifdef MAP_ANON
 116     flags = MAP_ANON;
 117     fd = -1;
 118 #else
 119     flags = 0;
 120     fd = open ("/dev/zero", O_RDONLY);
 121     if(fd < 0)
 122         err (1, "open /dev/zero");
 123 #endif
 124     map.fd = fd;
 125     flags |= MAP_PRIVATE;
 126
 127     map.size = size + pagesize - (size % pagesize) + pagesize * 2;
 128
 129     p = (unsigned char *)mmap(0, map.size, PROT_READ | PROT_WRITE,
 130                               flags, fd, 0);
 131     if (p == (unsigned char *)MAP_FAILED)
 132         err (1, "mmap");
 133
 134     map.start = p;
 135
 136     ret = mprotect ((void *)p, pagesize, 0);
 137     if (ret < 0)
 138         err (1, "mprotect");
 139
 140     ret = mprotect (p + map.size - pagesize, pagesize, 0);
 141     if (ret < 0)
 142         err (1, "mprotect");
 143
 144     switch (type) {
 145     case RK_TM_OVERRUN:
 146         map.data_start = p + map.size - pagesize - size;
 147         break;
 148     case RK_TM_UNDERRUN:
 149         map.data_start = p + pagesize;
 150         break;
 151     default:
 152         abort();
 153     }
 154 #endif
 155     sigemptyset (&sa.sa_mask);
 156     sa.sa_flags = 0;
 157 #ifdef SA_RESETHAND
 158     sa.sa_flags |= SA_RESETHAND;
 159 #endif
 160     sa.sa_handler = segv_handler;
 161     sigaction (SIGSEGV, &sa, &osa);
 162
 163     map.data_size = size;
 164     if (buf)
 165         memcpy(map.data_start, buf, size);
 166     return map.data_start;
 167 }
 168
 169 void ROKEN_LIB_FUNCTION
 170 rk_test_mem_free(const char *map_name)
 171 {
 172 #ifndef HAVE_MMAP
 173     unsigned char *p = map.start;
 174
 175     if (testname == NULL)
 176         errx(1, "test_mem_free call on no free");
 177
 178     if (p[0] != 0xff)
 179         errx(1, "%s: %s underrun %x\n", testname, map_name, p[0]);
 180     if (p[map.size] != 0xff)
 181         errx(1, "%s: %s overrun %x\n", testname, map_name, p[map.size - 1]);
 182     free(map.start);
 183 #else
 184     int ret;
 185
 186     if (testname == NULL)
 187         errx(1, "test_mem_free call on no free");
 188
 189     ret = munmap (map.start, map.size);
 190     if (ret < 0)
 191         err (1, "munmap");
 192     if (map.fd > 0)
 193         close(map.fd);
 194 #endif
 195     free(testname);
 196     testname = NULL;
 197
 198     sigaction (SIGSEGV, &osa, NULL);
 199 }