1 /* 2 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv (at) altlinux.org> 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 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "tests.h" 29 #include <assert.h> 30 #include <dlfcn.h> 31 #include <fcntl.h> 32 #include <unistd.h> 33 #include <sys/mman.h> 34 #include <sys/wait.h> 35 #include <sys/sendfile.h> 36 37 int main(void) 38 { 39 const unsigned long pagesize = get_page_size(); 40 41 #ifdef __s390__ 42 /* 43 * The si_addr field is unreliable: 44 * https://marc.info/?l=linux-s390&m=142515870124248&w=2 45 */ 46 error_msg_and_skip("s390: si_addr is unreliable"); 47 #endif 48 49 /* write instruction pointer length to the log */ 50 assert(write(-1, NULL, 2 * sizeof(void *)) < 0); 51 52 /* just a noticeable line in the log */ 53 assert(munmap(&main, 0) < 0); 54 55 int pid = fork(); 56 if (pid < 0) 57 perror_msg_and_fail("fork"); 58 59 if (!pid) { 60 const unsigned long mask = ~(pagesize - 1); 61 unsigned long addr = (unsigned long) &main & mask; 62 unsigned long size = pagesize << 1; 63 64 #ifdef HAVE_DLADDR 65 Dl_info info; 66 if (dladdr(&main, &info)) { 67 const unsigned long base = 68 (unsigned long) info.dli_fbase & mask; 69 if (base < addr) { 70 size += addr - base; 71 addr = base; 72 } 73 } else 74 #endif 75 { 76 addr -= size; 77 size <<= 1; 78 } 79 80 /* SIGSEGV is expected */ 81 (void) munmap((void *) addr, size); 82 (void) munmap((void *) addr, size); 83 error_msg_and_skip("SIGSEGV did not happen"); 84 } 85 86 int status; 87 assert(wait(&status) == pid); 88 assert(WIFSIGNALED(status)); 89 assert(WTERMSIG(status) == SIGSEGV); 90 91 /* dump process map for debug purposes */ 92 close(0); 93 if (!open("/proc/self/maps", O_RDONLY)) 94 (void) sendfile(1, 0, NULL, pagesize); 95 96 return 0; 97 } 98
