1 /* 2 * Copyright (c) 2016, Conrad Meyer 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 #include <sys/mman.h> 30 31 #include <err.h> 32 #include <stdint.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 36 /* 37 * This program is intended to create a bunch of segment mappings, then dump 38 * core. 39 */ 40 int 41 main(int argc __unused, char **argv __unused) 42 { 43 void *v; 44 size_t i, pages, page_size; 45 46 page_size = getpagesize(); 47 pages = UINT16_MAX + 1000; 48 v = mmap(NULL, pages * page_size, PROT_READ | PROT_WRITE, 49 MAP_ANON | MAP_PRIVATE, -1, 0); 50 if (v == NULL) 51 err(1, "mmap"); 52 for (i = 0; i < pages; i += 2) { 53 /* 54 * Alternate protections to interleave RW and R PT_LOAD 55 * segments. 56 */ 57 if (mprotect((char *)v + i * page_size, page_size, 58 PROT_READ) != 0) 59 err(1, "mprotect"); 60 } 61 62 /* Dump core. */ 63 abort(); 64 } 65