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
33SYS_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
50static void
51tprintf_uffdio_range(const struct uffdio_range *range)
52{
53	tprintf("{start=%#" PRI__x64 ", len=%#" PRI__x64 "}",
54		range->start, range->len);
55}
56
57int
58uffdio_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