1 /*
2 * Check decoding of "old mmap" edition of mmap syscall.
3 *
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31 #include <asm/unistd.h>
32
33 /*
34 * On s390x and m68k, this is the mmap syscall used by glibc, so,
35 * from one side, it's already covered by another test, and, from another side,
36 * it would require additional efforts to filter out mmap calls made by glibc.
37 */
38
39 #if defined __NR_mmap && \
40 ( defined __arm__ \
41 || defined __i386__ \
42 || (defined __s390__ && !defined __s390x__) \
43 )
44
45 # include <stdio.h>
46 # include <string.h>
47 # include <sys/mman.h>
48 # include <unistd.h>
49
50 int
main(void)51 main(void)
52 {
53 long rc = syscall(__NR_mmap, 0);
54 printf("mmap(NULL) = %ld %s (%m)\n", rc, errno2name());
55
56 const unsigned int args1_c[6] = {
57 0xdeadbeef, /* addr */
58 0xfacefeed, /* len */
59 PROT_READ|PROT_EXEC, /* prot */
60 MAP_FILE|MAP_FIXED, /* flags */
61 -2U, /* fd */
62 0xbadc0ded /* offset */
63 };
64 const unsigned int page_size = get_page_size();
65 const unsigned int args2_c[6] = {
66 0,
67 page_size,
68 PROT_READ|PROT_WRITE,
69 MAP_PRIVATE|MAP_ANONYMOUS,
70 -1U,
71 0xfaced000 & -page_size
72 };
73 void *args = tail_memdup(args1_c, sizeof(args1_c));
74
75 rc = syscall(__NR_mmap, args);
76 printf("mmap(%#x, %u, PROT_READ|PROT_EXEC, MAP_FILE|MAP_FIXED"
77 ", %d, %#x) = %ld %s (%m)\n",
78 args1_c[0], args1_c[1], args1_c[4], args1_c[5],
79 rc, errno2name());
80
81 memcpy(args, args2_c, sizeof(args2_c));
82 rc = syscall(__NR_mmap, args);
83 printf("mmap(NULL, %u, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS"
84 ", %d, %#x) = %#lx\n",
85 args2_c[1], args2_c[4], args2_c[5], rc);
86
87 void *addr = (void *) rc;
88 if (mprotect(addr, page_size, PROT_NONE))
89 perror_msg_and_fail("mprotect(%p, %u, PROT_NONE)",
90 addr, page_size);
91
92 puts("+++ exited with 0 +++");
93 return 0;
94 }
95
96 #else
97
98 SKIP_MAIN_UNDEFINED("__NR_mmap && (__arm__ || __i386__"
99 " || (__s390__ && !__s390x__))")
100
101 #endif
102