1 | /* Test for syscall interfaces. |
2 | Copyright (C) 2020-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | /* This test verifies that the x32 system call handling zero-extends |
20 | unsigned 32-bit arguments to the 64-bit argument registers for |
21 | system calls (bug 25810). The bug is specific to x32, but the test |
22 | should pass on all architectures. */ |
23 | |
24 | #include <stdio.h> |
25 | #include <stdlib.h> |
26 | #include <fcntl.h> |
27 | #include <sys/mman.h> |
28 | #include <support/check.h> |
29 | #include <support/xunistd.h> |
30 | |
31 | /* On x32, this can be passed in a single 64-bit integer register. */ |
32 | struct Array |
33 | { |
34 | size_t length; |
35 | void *ptr; |
36 | }; |
37 | |
38 | static int error_count; |
39 | |
40 | __attribute__ ((noclone, noinline)) |
41 | struct Array |
42 | allocate (size_t bytes) |
43 | { |
44 | if (!bytes) |
45 | return __extension__ (struct Array) {0, 0}; |
46 | |
47 | void *p = mmap (addr: 0x0, len: bytes, PROT_READ | PROT_WRITE, |
48 | MAP_PRIVATE | MAP_ANON, fd: -1, offset: 0); |
49 | if (p == MAP_FAILED) |
50 | return __extension__ (struct Array) {0, 0}; |
51 | |
52 | return __extension__ (struct Array) {bytes, p}; |
53 | } |
54 | |
55 | __attribute__ ((noclone, noinline)) |
56 | void |
57 | deallocate (struct Array b) |
58 | { |
59 | /* On x32, the 64-bit integer register containing `b' may be copied |
60 | to another 64-bit integer register to pass the second argument to |
61 | munmap. */ |
62 | if (b.length && munmap (addr: b.ptr, len: b.length)) |
63 | { |
64 | printf (format: "munmap error: %m\n" ); |
65 | error_count++; |
66 | } |
67 | } |
68 | |
69 | __attribute__ ((noclone, noinline)) |
70 | void * |
71 | do_mmap (void *addr, size_t length) |
72 | { |
73 | return mmap (addr: addr, len: length, PROT_READ | PROT_WRITE, |
74 | MAP_PRIVATE | MAP_ANON, fd: -1, offset: 0); |
75 | } |
76 | |
77 | __attribute__ ((noclone, noinline)) |
78 | void * |
79 | reallocate (struct Array b) |
80 | { |
81 | /* On x32, the 64-bit integer register containing `b' may be copied |
82 | to another 64-bit integer register to pass the second argument to |
83 | do_mmap. */ |
84 | if (b.length) |
85 | return do_mmap (addr: b.ptr, length: b.length); |
86 | return NULL; |
87 | } |
88 | |
89 | __attribute__ ((noclone, noinline)) |
90 | void |
91 | protect (struct Array b) |
92 | { |
93 | if (b.length) |
94 | { |
95 | /* On x32, the 64-bit integer register containing `b' may be copied |
96 | to another 64-bit integer register to pass the second argument |
97 | to mprotect. */ |
98 | if (mprotect (addr: b.ptr, len: b.length, |
99 | PROT_READ | PROT_WRITE | PROT_EXEC)) |
100 | { |
101 | printf (format: "mprotect error: %m\n" ); |
102 | error_count++; |
103 | } |
104 | } |
105 | } |
106 | |
107 | __attribute__ ((noclone, noinline)) |
108 | ssize_t |
109 | do_read (int fd, void *ptr, struct Array b) |
110 | { |
111 | /* On x32, the 64-bit integer register containing `b' may be copied |
112 | to another 64-bit integer register to pass the second argument to |
113 | read. */ |
114 | if (b.length) |
115 | return read (fd, ptr, b.length); |
116 | return 0; |
117 | } |
118 | |
119 | __attribute__ ((noclone, noinline)) |
120 | ssize_t |
121 | do_write (int fd, void *ptr, struct Array b) |
122 | { |
123 | /* On x32, the 64-bit integer register containing `b' may be copied |
124 | to another 64-bit integer register to pass the second argument to |
125 | write. */ |
126 | if (b.length) |
127 | return write (fd, ptr, b.length); |
128 | return 0; |
129 | } |
130 | |
131 | static int |
132 | do_test (void) |
133 | { |
134 | struct Array array; |
135 | |
136 | array = allocate (bytes: 1); |
137 | protect (b: array); |
138 | deallocate (b: array); |
139 | void *p = reallocate (b: array); |
140 | if (p == MAP_FAILED) |
141 | { |
142 | printf (format: "mmap error: %m\n" ); |
143 | error_count++; |
144 | } |
145 | array.ptr = p; |
146 | protect (b: array); |
147 | deallocate (b: array); |
148 | |
149 | int fd = xopen (path: "/dev/null" , O_RDWR, 0); |
150 | char buf[2]; |
151 | array.ptr = buf; |
152 | if (do_read (fd, ptr: array.ptr, b: array) == -1) |
153 | { |
154 | printf (format: "read error: %m\n" ); |
155 | error_count++; |
156 | } |
157 | if (do_write (fd, ptr: array.ptr, b: array) == -1) |
158 | { |
159 | printf (format: "write error: %m\n" ); |
160 | error_count++; |
161 | } |
162 | xclose (fd); |
163 | |
164 | return error_count ? EXIT_FAILURE : EXIT_SUCCESS; |
165 | } |
166 | |
167 | #include <support/test-driver.c> |
168 | |