1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2005 Roland McGrath <roland@redhat.com>
7 * Copyright (c) 2007-2015 Dmitry V. Levin <ldv@altlinux.org>
8 * Copyright (c) 2014-2018 The strace developers.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include "defs.h"
35
36 #define MS_MGC_VAL 0xc0ed0000 /* old magic mount flag number */
37 #define MS_MGC_MSK 0xffff0000 /* old magic mount flag mask */
38
39 #include "xlat/mount_flags.h"
40
SYS_FUNC(mount)41 SYS_FUNC(mount)
42 {
43 bool ignore_type = false;
44 bool ignore_data = false;
45 bool old_magic = false;
46 kernel_ulong_t flags = tcp->u_arg[3];
47
48 /* Discard magic */
49 if ((flags & MS_MGC_MSK) == MS_MGC_VAL) {
50 flags &= ~MS_MGC_MSK;
51 old_magic = true;
52 }
53
54 if (flags & MS_REMOUNT)
55 ignore_type = true;
56 else if (flags & (MS_BIND | MS_MOVE | MS_SHARED
57 | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
58 ignore_type = ignore_data = true;
59
60 printpath(tcp, tcp->u_arg[0]);
61 tprints(", ");
62
63 printpath(tcp, tcp->u_arg[1]);
64 tprints(", ");
65
66 if (ignore_type)
67 printaddr(tcp->u_arg[2]);
68 else
69 printstr(tcp, tcp->u_arg[2]);
70 tprints(", ");
71
72 if (old_magic) {
73 print_xlat(MS_MGC_VAL);
74 if (flags)
75 tprints("|");
76 }
77 if (flags || !old_magic)
78 printflags64(mount_flags, flags, "MS_???");
79 tprints(", ");
80
81 if (ignore_data)
82 printaddr(tcp->u_arg[4]);
83 else
84 printstr(tcp, tcp->u_arg[4]);
85
86 return RVAL_DECODED;
87 }
88