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