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 #include <config.h>
  35
  36 #ifdef HAVE_SYS_MMAN_H
  37 #include <sys/mman.h>
  38 #endif
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <err.h>
  42 #include "roken.h"
  43
  44 #include "test-mem.h"
  45
  46 RCSID("$Id$");
  47
  48 /* #undef HAVE_MMAP */
  49
  50 struct {
  51     void *start;
  52     size_t size;
  53     void *data_start;
  54     size_t data_size;
  55     enum rk_test_mem_type type;
  56     int fd;
  57 } map;
  58
  59 struct sigaction sa, osa;
  60
  61 char *testname;
  62
  63 static RETSIGTYPE
  64 segv_handler(int sig)
  65 {
  66     int fd;
  67     char msg[] = "SIGSEGV i current test: ";
  68
  69     fd = open("/dev/stdout", O_WRONLY, 0600);
  70     if (fd >= 0) {
  71         write(fd, msg, sizeof(msg) - 1);
  72         write(fd, testname, strlen(testname));
  73         write(fd, "\n", 1);
  74         close(fd);
  75     }
  76     _exit(1);
  77 }
  78
  79 #define TESTREC()                                                       \
  80     if (testname)                                                       \
  81         errx(1, "test %s run recursively on %s", name, testname);       \
  82     testname = strdup(name);                                            \
  83     if (testname == NULL)                                               \
  84         errx(1, "malloc");
  85
  86
  87 void * ROKEN_LIB_FUNCTION
  88 rk_test_mem_alloc(enum rk_test_mem_type type, const char *name,
  89                   void *buf, size_t size)
  90 {
  91 #ifndef HAVE_MMAP
  92     unsigned char *p;
  93
  94     TESTREC();
  95
  96     p = malloc(size + 2);
  97     if (p == NULL)
  98         errx(1, "malloc");
  99     map.type = type;
 100     map.start = p;
 101     map.size = size + 2;
 102     p[0] = 0xff;
 103     p[map.size] = 0xff;
 104     map.data_start = p + 1;
 105 #else
 106     unsigned char *p;
 107     int flags, ret, fd;
 108     size_t pagesize = getpagesize();
 109
 110     TESTREC();
 111
 112     map.type = type;
 113
 114 #ifdef MAP_ANON
 115     flags = MAP_ANON;
 116     fd = -1;
 117 #else
 118     flags = 0;
 119     fd = open ("/dev/zero", O_RDONLY);
 120     if(fd < 0)
 121         err (1, "open /dev/zero");
 122 #endif
 123     map.fd = fd;
 124     flags |= MAP_PRIVATE;
 125
 126     map.size = size + pagesize - (size % pagesize) + pagesize * 2;
 127
 128     p = (unsigned char *)mmap(0, map.size, PROT_READ | PROT_WRITE,
 129                               flags, fd, 0);
 130     if (p == (unsigned char *)MAP_FAILED)
 131         err (1, "mmap");
 132
 133     map.start = p;
 134
 135     ret = mprotect ((void *)p, pagesize, 0);
 136     if (ret < 0)
 137         err (1, "mprotect");
 138
 139     ret = mprotect (p + map.size - pagesize, pagesize, 0);
 140     if (ret < 0)
 141         err (1, "mprotect");
 142
 143     switch (type) {
 144     case RK_TM_OVERRUN:
 145         map.data_start = p + map.size - pagesize - size;
 146         break;
 147     case RK_TM_UNDERRUN:
 148         map.data_start = p + pagesize;
 149         break;
 150     default:
 151         abort();
 152     }
 153 #endif
 154     sigemptyset (&sa.sa_mask);
 155     sa.sa_flags = 0;
 156 #ifdef SA_RESETHAND
 157     sa.sa_flags |= SA_RESETHAND;
 158 #endif
 159     sa.sa_handler = segv_handler;
 160     sigaction (SIGSEGV, &sa, &osa);
 161
 162     map.data_size = size;
 163     if (buf)
 164         memcpy(map.data_start, buf, size);
 165     return map.data_start;
 166 }
 167
 168 void ROKEN_LIB_FUNCTION
 169 rk_test_mem_free(const char *map_name)
 170 {
 171 #ifndef HAVE_MMAP
 172     unsigned char *p = map.start;
 173
 174     if (testname == NULL)
 175         errx(1, "test_mem_free call on no free");
 176
 177     if (p[0] != 0xff)
 178         errx(1, "%s: %s underrun %x\n", testname, map_name, p[0]);
 179     if (p[map.size] != 0xff)
 180         errx(1, "%s: %s overrun %x\n", testname, map_name, p[map.size - 1]);
 181     free(map.start);
 182 #else
 183     int ret;
 184
 185     if (testname == NULL)
 186         errx(1, "test_mem_free call on no free");
 187
 188     ret = munmap (map.start, map.size);
 189     if (ret < 0)
 190         err (1, "munmap");
 191     if (map.fd > 0)
 192         close(map.fd);
 193 #endif
 194     free(testname);
 195     testname = NULL;
 196
 197     sigaction (SIGSEGV, &osa, NULL);
 198 }