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
31 #include "xlat/name_to_handle_at_flags.h"
32
33 #ifndef MAX_HANDLE_SZ
34 # define MAX_HANDLE_SZ 128
35 #endif
36
37 typedef struct {
38 unsigned int handle_bytes;
39 int handle_type;
40 } file_handle_header;
41
SYS_FUNC(name_to_handle_at)42 SYS_FUNC(name_to_handle_at)
43 {
44 file_handle_header h;
45 const kernel_ulong_t addr = tcp->u_arg[2];
46
47 if (entering(tcp)) {
48 /* dirfd */
49 print_dirfd(tcp, tcp->u_arg[0]);
50
51 /* pathname */
52 printpath(tcp, tcp->u_arg[1]);
53 tprints(", ");
54
55 /* handle */
56 if (umove_or_printaddr(tcp, addr, &h)) {
57 tprints(", ");
58
59 /* mount_id */
60 printaddr(tcp->u_arg[3]);
61 tprints(", ");
62
63 /* flags */
64 printflags(name_to_handle_at_flags, tcp->u_arg[4],
65 "AT_???");
66
67 return RVAL_DECODED;
68 }
69 tprintf("{handle_bytes=%u", h.handle_bytes);
70
71 set_tcb_priv_ulong(tcp, h.handle_bytes);
72
73 return 0;
74 } else {
75 unsigned int i = get_tcb_priv_ulong(tcp);
76
77 if ((!syserror(tcp) || EOVERFLOW == tcp->u_error)
78 && !umove(tcp, addr, &h)) {
79 unsigned char f_handle[MAX_HANDLE_SZ];
80
81 if (i != h.handle_bytes)
82 tprintf(" => %u", h.handle_bytes);
83 if (!syserror(tcp)) {
84 tprintf(", handle_type=%d", h.handle_type);
85 if (h.handle_bytes > MAX_HANDLE_SZ)
86 h.handle_bytes = MAX_HANDLE_SZ;
87 if (!umoven(tcp, addr + sizeof(h), h.handle_bytes,
88 f_handle)) {
89 tprints(", f_handle=0x");
90 for (i = 0; i < h.handle_bytes; ++i)
91 tprintf("%02x", f_handle[i]);
92 }
93 }
94 }
95 tprints("}, ");
96
97 /* mount_id */
98 printnum_int(tcp, tcp->u_arg[3], "%d");
99 tprints(", ");
100
101 /* flags */
102 printflags(name_to_handle_at_flags, tcp->u_arg[4], "AT_???");
103 }
104 return 0;
105 }
106
SYS_FUNC(open_by_handle_at)107 SYS_FUNC(open_by_handle_at)
108 {
109 file_handle_header h;
110 const kernel_ulong_t addr = tcp->u_arg[1];
111
112 /* mount_fd */
113 printfd(tcp, tcp->u_arg[0]);
114 tprints(", ");
115
116 /* handle */
117 if (!umove_or_printaddr(tcp, addr, &h)) {
118 unsigned char f_handle[MAX_HANDLE_SZ];
119
120 tprintf("{handle_bytes=%u, handle_type=%d",
121 h.handle_bytes, h.handle_type);
122 if (h.handle_bytes > MAX_HANDLE_SZ)
123 h.handle_bytes = MAX_HANDLE_SZ;
124 if (!umoven(tcp, addr + sizeof(h), h.handle_bytes, &f_handle)) {
125 unsigned int i;
126
127 tprints(", f_handle=0x");
128 for (i = 0; i < h.handle_bytes; ++i)
129 tprintf("%02x", f_handle[i]);
130 }
131 tprints("}");
132 }
133 tprints(", ");
134
135 /* flags */
136 tprint_open_modes(tcp->u_arg[2]);
137
138 return RVAL_DECODED;
139 }
140