1 /*
2 * Check decoding of memfd_create syscall.
3 *
4 * Copyright (c) 2015-2017 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 #include "scno.h"
33
34 #ifdef __NR_memfd_create
35
36 # include <stdio.h>
37 # include <stdint.h>
38 # include <unistd.h>
39
40 # ifdef HAVE_LINUX_MEMFD_H
41 # include <linux/memfd.h>
42 # endif
43
44 # ifndef MFD_HUGE_SHIFT
45 # define MFD_HUGE_SHIFT 26
46 # endif
47
48 # ifndef MFD_HUGE_MASK
49 # define MFD_HUGE_MASK 0x3f
50 # endif
51
52 static const char *errstr;
53
54 static long
k_memfd_create(const kernel_ulong_t name,const kernel_ulong_t flags)55 k_memfd_create(const kernel_ulong_t name, const kernel_ulong_t flags)
56 {
57 const long rc = syscall(__NR_memfd_create, name, flags);
58 errstr = sprintrc(rc);
59 return rc;
60 }
61
62 int
main(void)63 main(void)
64 {
65 const size_t size = 255 - (sizeof("memfd:") - 1) + 1;
66 char *pattern = tail_alloc(size);
67 fill_memory_ex(pattern, size, '0', 10);
68
69 k_memfd_create((uintptr_t) pattern, 0);
70 printf("memfd_create(\"%.*s\"..., 0) = %s\n",
71 (int) size - 1, pattern, errstr);
72
73 kernel_ulong_t flags = (kernel_ulong_t) 0xfacefeed00000007ULL;
74 k_memfd_create((uintptr_t) pattern, flags);
75 printf("memfd_create(\"%.*s\"..., %s) = %s\n",
76 (int) size - 1, pattern,
77 "MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB",
78 errstr);
79
80 pattern[size - 1] = '\0';
81 flags = 30 << MFD_HUGE_SHIFT;
82 k_memfd_create((uintptr_t) pattern, flags);
83 printf("memfd_create(\"%s\", 30<<MFD_HUGE_SHIFT) = %s\n",
84 pattern, errstr);
85
86 pattern += size - 1;
87 flags = (kernel_ulong_t) -1ULL;
88 k_memfd_create(0, flags);
89 flags = -1U & ~(7 | (MFD_HUGE_MASK << MFD_HUGE_SHIFT));
90 printf("memfd_create(NULL, MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB"
91 "|%#x|%u<<MFD_HUGE_SHIFT) = %s\n",
92 (unsigned int) flags, MFD_HUGE_MASK, errstr);
93
94 puts("+++ exited with 0 +++");
95 return 0;
96 }
97
98 #else
99
100 SKIP_MAIN_UNDEFINED("__NR_memfd_create")
101
102 #endif
103