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