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1 | /* | |
2 | * linux/fs/compat.c | |
3 | * | |
4 | * Kernel compatibililty routines for e.g. 32 bit syscall support | |
5 | * on 64 bit kernels. | |
6 | * | |
7 | * Copyright (C) 2002 Stephen Rothwell, IBM Corporation | |
8 | * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com) | |
9 | * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) | |
10 | * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs | |
11 | * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz) | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/compat.h> | |
19 | #include <linux/nfs4_mount.h> | |
20 | #include <linux/syscalls.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include "internal.h" | |
24 | ||
25 | struct compat_nfs_string { | |
26 | compat_uint_t len; | |
27 | compat_uptr_t data; | |
28 | }; | |
29 | ||
30 | static inline void compat_nfs_string(struct nfs_string *dst, | |
31 | struct compat_nfs_string *src) | |
32 | { | |
33 | dst->data = compat_ptr(src->data); | |
34 | dst->len = src->len; | |
35 | } | |
36 | ||
37 | struct compat_nfs4_mount_data_v1 { | |
38 | compat_int_t version; | |
39 | compat_int_t flags; | |
40 | compat_int_t rsize; | |
41 | compat_int_t wsize; | |
42 | compat_int_t timeo; | |
43 | compat_int_t retrans; | |
44 | compat_int_t acregmin; | |
45 | compat_int_t acregmax; | |
46 | compat_int_t acdirmin; | |
47 | compat_int_t acdirmax; | |
48 | struct compat_nfs_string client_addr; | |
49 | struct compat_nfs_string mnt_path; | |
50 | struct compat_nfs_string hostname; | |
51 | compat_uint_t host_addrlen; | |
52 | compat_uptr_t host_addr; | |
53 | compat_int_t proto; | |
54 | compat_int_t auth_flavourlen; | |
55 | compat_uptr_t auth_flavours; | |
56 | }; | |
57 | ||
58 | static int do_nfs4_super_data_conv(void *raw_data) | |
59 | { | |
60 | int version = *(compat_uint_t *) raw_data; | |
61 | ||
62 | if (version == 1) { | |
63 | struct compat_nfs4_mount_data_v1 *raw = raw_data; | |
64 | struct nfs4_mount_data *real = raw_data; | |
65 | ||
66 | /* copy the fields backwards */ | |
67 | real->auth_flavours = compat_ptr(raw->auth_flavours); | |
68 | real->auth_flavourlen = raw->auth_flavourlen; | |
69 | real->proto = raw->proto; | |
70 | real->host_addr = compat_ptr(raw->host_addr); | |
71 | real->host_addrlen = raw->host_addrlen; | |
72 | compat_nfs_string(&real->hostname, &raw->hostname); | |
73 | compat_nfs_string(&real->mnt_path, &raw->mnt_path); | |
74 | compat_nfs_string(&real->client_addr, &raw->client_addr); | |
75 | real->acdirmax = raw->acdirmax; | |
76 | real->acdirmin = raw->acdirmin; | |
77 | real->acregmax = raw->acregmax; | |
78 | real->acregmin = raw->acregmin; | |
79 | real->retrans = raw->retrans; | |
80 | real->timeo = raw->timeo; | |
81 | real->wsize = raw->wsize; | |
82 | real->rsize = raw->rsize; | |
83 | real->flags = raw->flags; | |
84 | real->version = raw->version; | |
85 | } | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | #define NFS4_NAME "nfs4" | |
91 | ||
92 | COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, | |
93 | const char __user *, dir_name, | |
94 | const char __user *, type, compat_ulong_t, flags, | |
95 | const void __user *, data) | |
96 | { | |
97 | char *kernel_type; | |
98 | void *options; | |
99 | char *kernel_dev; | |
100 | int retval; | |
101 | ||
102 | kernel_type = copy_mount_string(type); | |
103 | retval = PTR_ERR(kernel_type); | |
104 | if (IS_ERR(kernel_type)) | |
105 | goto out; | |
106 | ||
107 | kernel_dev = copy_mount_string(dev_name); | |
108 | retval = PTR_ERR(kernel_dev); | |
109 | if (IS_ERR(kernel_dev)) | |
110 | goto out1; | |
111 | ||
112 | options = copy_mount_options(data); | |
113 | retval = PTR_ERR(options); | |
114 | if (IS_ERR(options)) | |
115 | goto out2; | |
116 | ||
117 | if (kernel_type && options) { | |
118 | if (!strcmp(kernel_type, NFS4_NAME)) { | |
119 | retval = -EINVAL; | |
120 | if (do_nfs4_super_data_conv(options)) | |
121 | goto out3; | |
122 | } | |
123 | } | |
124 | ||
125 | retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options); | |
126 | ||
127 | out3: | |
128 | kfree(options); | |
129 | out2: | |
130 | kfree(kernel_dev); | |
131 | out1: | |
132 | kfree(kernel_type); | |
133 | out: | |
134 | return retval; | |
135 | } |