1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2015-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "defs.h"
30 #include "print_fields.h"
31 #include <fcntl.h>
32
33 #include "xlat/uffd_flags.h"
34
SYS_FUNC(userfaultfd)35 SYS_FUNC(userfaultfd)
36 {
37 printflags(uffd_flags, tcp->u_arg[0], "UFFD_???");
38
39 return RVAL_DECODED | RVAL_FD;
40 }
41
42 #ifdef HAVE_LINUX_USERFAULTFD_H
43 # include <linux/ioctl.h>
44 # include <linux/userfaultfd.h>
45
46 # include "xlat/uffd_api_features.h"
47 # include "xlat/uffd_api_flags.h"
48 # include "xlat/uffd_copy_flags.h"
49 # include "xlat/uffd_register_ioctl_flags.h"
50 # include "xlat/uffd_register_mode_flags.h"
51 # include "xlat/uffd_zeropage_flags.h"
52
53 static void
tprintf_uffdio_range(const struct uffdio_range * range)54 tprintf_uffdio_range(const struct uffdio_range *range)
55 {
56 PRINT_FIELD_X("{", *range, start);
57 PRINT_FIELD_X(", ", *range, len);
58 tprints("}");
59 }
60
61 #define PRINT_FIELD_UFFDIO_RANGE(prefix_, where_, field_) \
62 do { \
63 STRACE_PRINTF("%s%s=", (prefix_), #field_); \
64 tprintf_uffdio_range(&(where_).field_); \
65 } while (0)
66
67 int
uffdio_ioctl(struct tcb * const tcp,const unsigned int code,const kernel_ulong_t arg)68 uffdio_ioctl(struct tcb *const tcp, const unsigned int code,
69 const kernel_ulong_t arg)
70 {
71 switch (code) {
72 case UFFDIO_API: {
73 uint64_t *entering_features;
74 struct uffdio_api ua;
75
76 if (entering(tcp)) {
77 tprints(", ");
78 if (umove_or_printaddr(tcp, arg, &ua))
79 break;
80 PRINT_FIELD_X("{", ua, api);
81 PRINT_FIELD_FLAGS(", ", ua, features, uffd_api_features,
82 "UFFD_FEATURE_???");
83 entering_features = malloc(sizeof(*entering_features));
84 if (entering_features) {
85 *entering_features = ua.features;
86 set_tcb_priv_data(tcp, entering_features, free);
87 }
88
89 return 0;
90 }
91
92 if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
93 entering_features = get_tcb_priv_data(tcp);
94
95 if (!entering_features
96 || *entering_features != ua.features) {
97 PRINT_FIELD_FLAGS(" => ", ua, features,
98 uffd_api_features,
99 "UFFD_FEATURE_???");
100 }
101
102 PRINT_FIELD_FLAGS(", ", ua, ioctls, uffd_api_flags,
103 "_UFFDIO_???");
104 }
105
106 tprints("}");
107
108 break;
109 }
110
111 case UFFDIO_COPY: {
112 struct uffdio_copy uc;
113
114 if (entering(tcp)) {
115 tprints(", ");
116 if (umove_or_printaddr(tcp, arg, &uc))
117 return RVAL_IOCTL_DECODED;
118 PRINT_FIELD_X("{", uc, dst);
119 PRINT_FIELD_X(", ", uc, src);
120 PRINT_FIELD_X(", ", uc, len);
121 PRINT_FIELD_FLAGS(", ", uc, mode, uffd_copy_flags,
122 "UFFDIO_COPY_???");
123
124 return 0;
125 }
126
127 if (!syserror(tcp) && !umove(tcp, arg, &uc))
128 PRINT_FIELD_X(", ", uc, copy);
129
130 tprints("}");
131
132 break;
133 }
134
135 case UFFDIO_REGISTER: {
136 struct uffdio_register ur;
137
138 if (entering(tcp)) {
139 tprints(", ");
140 if (umove_or_printaddr(tcp, arg, &ur))
141 return RVAL_IOCTL_DECODED;
142 PRINT_FIELD_UFFDIO_RANGE("{", ur, range);
143 PRINT_FIELD_FLAGS(", ", ur, mode,
144 uffd_register_mode_flags,
145 "UFFDIO_REGISTER_MODE_???");
146
147 return 0;
148 }
149
150 if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
151 PRINT_FIELD_FLAGS(", ", ur, ioctls,
152 uffd_register_ioctl_flags,
153 "UFFDIO_???");
154 }
155
156 tprints("}");
157
158 break;
159 }
160
161 case UFFDIO_UNREGISTER:
162 case UFFDIO_WAKE: {
163 struct uffdio_range ura;
164
165 tprints(", ");
166
167 if (!umove_or_printaddr(tcp, arg, &ura))
168 tprintf_uffdio_range(&ura);
169
170 break;
171 }
172
173 case UFFDIO_ZEROPAGE: {
174 struct uffdio_zeropage uz;
175
176 if (entering(tcp)) {
177 tprints(", ");
178 if (umove_or_printaddr(tcp, arg, &uz))
179 return RVAL_IOCTL_DECODED;
180 PRINT_FIELD_UFFDIO_RANGE("{", uz, range);
181 PRINT_FIELD_FLAGS(", ", uz, mode, uffd_zeropage_flags,
182 "UFFDIO_ZEROPAGE_???");
183
184 return 0;
185 }
186
187 if (!syserror(tcp) && !umove(tcp, arg, &uz))
188 PRINT_FIELD_X(", ", uz, zeropage);
189
190 tprints("}");
191
192 break;
193 }
194
195 default:
196 return RVAL_DECODED;
197 }
198
199 return RVAL_IOCTL_DECODED;
200 }
201 #endif /* HAVE_LINUX_USERFAULTFD_H */
202