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
30 #ifndef MAX_HANDLE_SZ
31 # define MAX_HANDLE_SZ 128
32 #endif
33
34 typedef struct {
35 unsigned int handle_bytes;
36 int handle_type;
37 } file_handle_header;
38
SYS_FUNC(name_to_handle_at)39 SYS_FUNC(name_to_handle_at)
40 {
41 file_handle_header h;
42 const long addr = tcp->u_arg[2];
43
44 if (entering(tcp)) {
45 /* dirfd */
46 print_dirfd(tcp, tcp->u_arg[0]);
47
48 /* pathname */
49 printpath(tcp, tcp->u_arg[1]);
50 tprints(", ");
51
52 /* handle */
53 if (umove_or_printaddr(tcp, addr, &h)) {
54 tprints(", ");
55
56 /* mount_id */
57 printaddr(tcp->u_arg[3]);
58 tprints(", ");
59
60 /* flags */
61 printflags(at_flags, tcp->u_arg[4], "AT_???");
62
63 return RVAL_DECODED;
64 }
65 tprintf("{handle_bytes=%u", h.handle_bytes);
66
67 /*
68 * Abusing tcp->auxstr as a temporary storage.
69 * Will be used and cleared on syscall exit.
70 */
71 tcp->auxstr = (void *) (unsigned long) h.handle_bytes;
72
73 return 0;
74 } else {
75 unsigned int i = (unsigned long) tcp->auxstr;
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 tcp->auxstr = NULL;
97
98 /* mount_id */
99 printnum_int(tcp, tcp->u_arg[3], "%d");
100 tprints(", ");
101
102 /* flags */
103 printflags(at_flags, tcp->u_arg[4], "AT_???");
104 }
105 return 0;
106 }
107
SYS_FUNC(open_by_handle_at)108 SYS_FUNC(open_by_handle_at)
109 {
110 file_handle_header h;
111 const long addr = tcp->u_arg[1];
112
113 /* mount_fd */
114 printfd(tcp, tcp->u_arg[0]);
115 tprints(", ");
116
117 /* handle */
118 if (!umove_or_printaddr(tcp, addr, &h)) {
119 unsigned char f_handle[MAX_HANDLE_SZ];
120
121 tprintf("{handle_bytes=%u, handle_type=%d",
122 h.handle_bytes, h.handle_type);
123 if (h.handle_bytes > MAX_HANDLE_SZ)
124 h.handle_bytes = MAX_HANDLE_SZ;
125 if (!umoven(tcp, addr + sizeof(h), h.handle_bytes, &f_handle)) {
126 unsigned int i;
127
128 tprints(", f_handle=0x");
129 for (i = 0; i < h.handle_bytes; ++i)
130 tprintf("%02x", f_handle[i]);
131 }
132 tprints("}");
133 }
134 tprints(", ");
135
136 /* flags */
137 tprint_open_modes(tcp->u_arg[2]);
138
139 return RVAL_DECODED;
140 }
141