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fc22118d AK |
1 | /* |
2 | * Virtio 9p user. xattr callback | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <sys/types.h> | |
0d09e41a | 15 | #include "hw/virtio/virtio.h" |
fc22118d | 16 | #include "virtio-9p.h" |
353ac78d | 17 | #include "fsdev/file-op-9p.h" |
fc22118d AK |
18 | #include "virtio-9p-xattr.h" |
19 | ||
20 | ||
21 | static ssize_t mp_user_getxattr(FsContext *ctx, const char *path, | |
22 | const char *name, void *value, size_t size) | |
23 | { | |
faa44e3d | 24 | char buffer[PATH_MAX]; |
fc22118d AK |
25 | if (strncmp(name, "user.virtfs.", 12) == 0) { |
26 | /* | |
27 | * Don't allow fetch of user.virtfs namesapce | |
28 | * in case of mapped security | |
29 | */ | |
30 | errno = ENOATTR; | |
31 | return -1; | |
32 | } | |
faa44e3d | 33 | return lgetxattr(rpath(ctx, path, buffer), name, value, size); |
fc22118d AK |
34 | } |
35 | ||
36 | static ssize_t mp_user_listxattr(FsContext *ctx, const char *path, | |
37 | char *name, void *value, size_t size) | |
38 | { | |
39 | int name_size = strlen(name) + 1; | |
40 | if (strncmp(name, "user.virtfs.", 12) == 0) { | |
70fc55eb AK |
41 | |
42 | /* check if it is a mapped posix acl */ | |
43 | if (strncmp(name, "user.virtfs.system.posix_acl_", 29) == 0) { | |
44 | /* adjust the name and size */ | |
45 | name += 12; | |
46 | name_size -= 12; | |
47 | } else { | |
48 | /* | |
49 | * Don't allow fetch of user.virtfs namesapce | |
50 | * in case of mapped security | |
51 | */ | |
52 | return 0; | |
53 | } | |
fc22118d AK |
54 | } |
55 | if (!value) { | |
56 | return name_size; | |
57 | } | |
58 | ||
59 | if (size < name_size) { | |
60 | errno = ERANGE; | |
61 | return -1; | |
62 | } | |
63 | ||
9238c209 JM |
64 | /* name_size includes the trailing NUL. */ |
65 | memcpy(value, name, name_size); | |
fc22118d AK |
66 | return name_size; |
67 | } | |
68 | ||
69 | static int mp_user_setxattr(FsContext *ctx, const char *path, const char *name, | |
70 | void *value, size_t size, int flags) | |
71 | { | |
faa44e3d | 72 | char buffer[PATH_MAX]; |
fc22118d AK |
73 | if (strncmp(name, "user.virtfs.", 12) == 0) { |
74 | /* | |
75 | * Don't allow fetch of user.virtfs namesapce | |
76 | * in case of mapped security | |
77 | */ | |
78 | errno = EACCES; | |
79 | return -1; | |
80 | } | |
faa44e3d | 81 | return lsetxattr(rpath(ctx, path, buffer), name, value, size, flags); |
fc22118d AK |
82 | } |
83 | ||
84 | static int mp_user_removexattr(FsContext *ctx, | |
85 | const char *path, const char *name) | |
86 | { | |
faa44e3d | 87 | char buffer[PATH_MAX]; |
fc22118d AK |
88 | if (strncmp(name, "user.virtfs.", 12) == 0) { |
89 | /* | |
90 | * Don't allow fetch of user.virtfs namesapce | |
91 | * in case of mapped security | |
92 | */ | |
93 | errno = EACCES; | |
94 | return -1; | |
95 | } | |
faa44e3d | 96 | return lremovexattr(rpath(ctx, path, buffer), name); |
fc22118d AK |
97 | } |
98 | ||
99 | XattrOperations mapped_user_xattr = { | |
100 | .name = "user.", | |
101 | .getxattr = mp_user_getxattr, | |
102 | .setxattr = mp_user_setxattr, | |
103 | .listxattr = mp_user_listxattr, | |
104 | .removexattr = mp_user_removexattr, | |
105 | }; | |
106 | ||
107 | XattrOperations passthrough_user_xattr = { | |
108 | .name = "user.", | |
109 | .getxattr = pt_getxattr, | |
110 | .setxattr = pt_setxattr, | |
111 | .listxattr = pt_listxattr, | |
112 | .removexattr = pt_removexattr, | |
113 | }; |