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 #ifdef HAVE_SIGACTION
  58
  59 struct sigaction sa, osa;
  60
  61 #else
  62
  63 void (* osigh)(int);
  64
  65 #endif
  66
  67 char *testname;
  68
  69 static RETSIGTYPE
  70 segv_handler(int sig)
  71 {
  72     int fd;
  73     ssize_t ret;
  74     char msg[] = "SIGSEGV i current test: ";
  75
  76     fd = open("/dev/stdout", O_WRONLY, 0600);
  77     if (fd >= 0) {
  78         ret = write(fd, msg, sizeof(msg) - 1);
  79         if (ret != -1)
  80             ret = write(fd, testname, strlen(testname));
  81         if (ret != -1)
  82             ret = write(fd, "\n", 1);
  83         close(fd);
  84     }
  85     _exit(1);
  86 }
  87
  88 #define TESTREC()                                                       \
  89     if (testname)                                                       \
  90         errx(1, "test %s run recursively on %s", name, testname);       \
  91     testname = strdup(name);                                            \
  92     if (testname == NULL)                                               \
  93         errx(1, "malloc");
  94
  95
  96 ROKEN_LIB_FUNCTION void * ROKEN_LIB_CALL
  97 rk_test_mem_alloc(enum rk_test_mem_type type, const char *name,
  98                   void *buf, size_t size)
  99 {
 100 #ifndef HAVE_MMAP
 101     unsigned char *p;
 102
 103     TESTREC();
 104
 105     p = malloc(size + 2);
 106     if (p == NULL)
 107         errx(1, "malloc");
 108     map.type = type;
 109     map.start = p;
 110     map.size = size + 2;
 111     p[0] = 0xff;
 112     p[map.size-1] = 0xff;
 113     map.data_start = p + 1;
 114 #else
 115     unsigned char *p;
 116     int flags, ret, fd;
 117     size_t pagesize = getpagesize();
 118
 119     TESTREC();
 120
 121     map.type = type;
 122
 123 #ifdef MAP_ANON
 124     flags = MAP_ANON;
 125     fd = -1;
 126 #else
 127     flags = 0;
 128     fd = open ("/dev/zero", O_RDONLY);
 129     if(fd < 0)
 130         err (1, "open /dev/zero");
 131 #endif
 132     map.fd = fd;
 133     flags |= MAP_PRIVATE;
 134
 135     map.size = size + pagesize - (size % pagesize) + pagesize * 2;
 136
 137     p = (unsigned char *)mmap(0, map.size, PROT_READ | PROT_WRITE,
 138                               flags, fd, 0);
 139     if (p == (unsigned char *)MAP_FAILED)
 140         err (1, "mmap");
 141
 142     map.start = p;
 143
 144     ret = mprotect ((void *)p, pagesize, 0);
 145     if (ret < 0)
 146         err (1, "mprotect");
 147
 148     ret = mprotect (p + map.size - pagesize, pagesize, 0);
 149     if (ret < 0)
 150         err (1, "mprotect");
 151
 152     switch (type) {
 153     case RK_TM_OVERRUN:
 154         map.data_start = p + map.size - pagesize - size;
 155         break;
 156     case RK_TM_UNDERRUN:
 157         map.data_start = p + pagesize;
 158         break;
 159     default:
 160         abort();
 161     }
 162 #endif
 163 #ifdef HAVE_SIGACTION
 164     sigemptyset (&sa.sa_mask);
 165     sa.sa_flags = 0;
 166 #ifdef SA_RESETHAND
 167     sa.sa_flags |= SA_RESETHAND;
 168 #endif
 169     sa.sa_handler = segv_handler;
 170     sigaction (SIGSEGV, &sa, &osa);
 171 #else
 172     osigh = signal(SIGSEGV, segv_handler);
 173 #endif
 174
 175     map.data_size = size;
 176     if (buf)
 177         memcpy(map.data_start, buf, size);
 178     return map.data_start;
 179 }
 180
 181 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
 182 rk_test_mem_free(const char *map_name)
 183 {
 184 #ifndef HAVE_MMAP
 185     unsigned char *p = map.start;
 186
 187     if (testname == NULL)
 188         errx(1, "test_mem_free call on no free");
 189
 190     if (p[0] != 0xff)
 191         errx(1, "%s: %s underrun %x\n", testname, map_name, p[0]);
 192     if (p[map.size-1] != 0xff)
 193         errx(1, "%s: %s overrun %x\n", testname, map_name, p[map.size - 1]);
 194     free(map.start);
 195 #else
 196     int ret;
 197
 198     if (testname == NULL)
 199         errx(1, "test_mem_free call on no free");
 200
 201     ret = munmap (map.start, map.size);
 202     if (ret < 0)
 203         err (1, "munmap");
 204     if (map.fd > 0)
 205         close(map.fd);
 206 #endif
 207     free(testname);
 208     testname = NULL;
 209
 210 #ifdef HAVE_SIGACTION
 211     sigaction (SIGSEGV, &osa, NULL);
 212 #else
 213     signal (SIGSEGV, osigh);
 214 #endif
 215 }