1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@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 <stdio.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <sys/mman.h>
32
33 int
main(void)34 main(void)
35 {
36 const size_t page_len = sysconf(_SC_PAGESIZE);
37 const size_t work_len = page_len * 2;
38 const size_t tail_len = work_len - 1;
39
40 void *p = mmap(NULL, page_len * 3, PROT_READ | PROT_WRITE,
41 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
42 if (p == MAP_FAILED || mprotect(p + work_len, page_len, PROT_NONE))
43 return 77;
44
45 memset(p, 0, work_len);
46 char *addr = p + work_len - tail_len;
47 memset(addr, '0', tail_len - 1);
48
49 char *argv[] = { NULL };
50 char *envp[] = { addr, NULL };
51 execve("", argv, envp);
52
53 printf("execve(\"\", [], [\"%0*u\"]) = -1 ENOENT (No such file or directory)\n",
54 (int) tail_len - 1, 0);
55 puts("+++ exited with 0 +++");
56
57 return 0;
58 }
59