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 "defs.h"
29 #include <fcntl.h>
30
31 #include "xlat/uffd_flags.h"
32
SYS_FUNC(userfaultfd)33 SYS_FUNC(userfaultfd)
34 {
35 printflags(uffd_flags, tcp->u_arg[0], "UFFD_???");
36
37 return RVAL_DECODED | RVAL_FD;
38 }
39
40 #ifdef HAVE_LINUX_USERFAULTFD_H
41 # include <linux/ioctl.h>
42 # include <linux/userfaultfd.h>
43
44 # include "xlat/uffd_api_flags.h"
45 # include "xlat/uffd_copy_flags.h"
46 # include "xlat/uffd_register_ioctl_flags.h"
47 # include "xlat/uffd_register_mode_flags.h"
48 # include "xlat/uffd_zeropage_flags.h"
49
50 static void
tprintf_uffdio_range(const struct uffdio_range * range)51 tprintf_uffdio_range(const struct uffdio_range *range)
52 {
53 tprintf("{start=%#" PRI__x64 ", len=%#" PRI__x64 "}",
54 range->start, range->len);
55 }
56
57 int
uffdio_ioctl(struct tcb * const tcp,const unsigned int code,const kernel_ulong_t arg)58 uffdio_ioctl(struct tcb *const tcp, const unsigned int code,
59 const kernel_ulong_t arg)
60 {
61 switch (code) {
62 case UFFDIO_API: {
63 struct uffdio_api ua;
64 if (entering(tcp)) {
65 tprints(", ");
66 if (umove_or_printaddr(tcp, arg, &ua))
67 return RVAL_DECODED | 1;
68 /* Features is intended to contain some flags, but
69 * there aren't any defined yet.
70 */
71 tprintf("{api=%#" PRI__x64
72 ", features=%#" PRI__x64,
73 ua.api, ua.features);
74 } else {
75 if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
76 tprintf(", features.out=%#" PRI__x64
77 ", ioctls=", ua.features);
78 printflags64(uffd_api_flags, ua.ioctls,
79 "_UFFDIO_???");
80 }
81 tprints("}");
82 }
83 return 1;
84 }
85
86 case UFFDIO_COPY: {
87 struct uffdio_copy uc;
88 if (entering(tcp)) {
89 tprints(", ");
90 if (umove_or_printaddr(tcp, arg, &uc))
91 return RVAL_DECODED | 1;
92 tprintf("{dst=%#" PRI__x64 ", src=%#" PRI__x64
93 ", len=%#" PRI__x64 ", mode=",
94 uc.dst, uc.src, uc.len);
95 printflags64(uffd_copy_flags, uc.mode,
96 "UFFDIO_COPY_???");
97 } else {
98 if (!syserror(tcp) && !umove(tcp, arg, &uc))
99 tprintf(", copy=%#" PRI__x64, uc.copy);
100 tprints("}");
101 }
102 return 1;
103 }
104
105 case UFFDIO_REGISTER: {
106 struct uffdio_register ur;
107 if (entering(tcp)) {
108 tprints(", ");
109 if (umove_or_printaddr(tcp, arg, &ur))
110 return RVAL_DECODED | 1;
111 tprints("{range=");
112 tprintf_uffdio_range(&ur.range);
113 tprints(", mode=");
114 printflags64(uffd_register_mode_flags, ur.mode,
115 "UFFDIO_REGISTER_MODE_???");
116 } else {
117 if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
118 tprints(", ioctls=");
119 printflags64(uffd_register_ioctl_flags,
120 ur.ioctls, "UFFDIO_???");
121 }
122 tprints("}");
123 }
124 return 1;
125 }
126
127 case UFFDIO_UNREGISTER:
128 case UFFDIO_WAKE: {
129 struct uffdio_range ura;
130 tprints(", ");
131 if (!umove_or_printaddr(tcp, arg, &ura))
132 tprintf_uffdio_range(&ura);
133 return RVAL_DECODED | 1;
134 }
135
136 case UFFDIO_ZEROPAGE: {
137 struct uffdio_zeropage uz;
138 if (entering(tcp)) {
139 tprints(", ");
140 if (umove_or_printaddr(tcp, arg, &uz))
141 return RVAL_DECODED | 1;
142 tprints("{range=");
143 tprintf_uffdio_range(&uz.range);
144 tprints(", mode=");
145 printflags64(uffd_zeropage_flags, uz.mode,
146 "UFFDIO_ZEROPAGE_???");
147 } else {
148 if (!syserror(tcp) && !umove(tcp, arg, &uz))
149 tprintf(", zeropage=%#" PRI__x64, uz.zeropage);
150 tprints("}");
151 }
152 return 1;
153 }
154
155 default:
156 return RVAL_DECODED;
157 }
158 }
159 #endif /* HAVE_LINUX_USERFAULTFD_H */
160