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Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +05301/*
Wei Liu267ae092015-11-18 18:31:52 +00002 * 9p user. xattr callback
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +05303 *
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
Peter Maydellfbc04122016-01-26 18:17:10 +000014#include "qemu/osdep.h"
Wei Liuebe74f82016-01-07 18:18:02 +000015#include "9p.h"
Aneesh Kumar K.V353ac782011-01-28 18:09:08 +053016#include "fsdev/file-op-9p.h"
Wei Liu267ae092015-11-18 18:31:52 +000017#include "9p-xattr.h"
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053018
19
20static ssize_t mp_user_getxattr(FsContext *ctx, const char *path,
21 const char *name, void *value, size_t size)
22{
Chen Gang4fa4ce72014-03-02 01:36:19 +080023 char *buffer;
24 ssize_t ret;
25
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053026 if (strncmp(name, "user.virtfs.", 12) == 0) {
27 /*
28 * Don't allow fetch of user.virtfs namesapce
29 * in case of mapped security
30 */
31 errno = ENOATTR;
32 return -1;
33 }
Chen Gang4fa4ce72014-03-02 01:36:19 +080034 buffer = rpath(ctx, path);
35 ret = lgetxattr(buffer, name, value, size);
36 g_free(buffer);
37 return ret;
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053038}
39
40static ssize_t mp_user_listxattr(FsContext *ctx, const char *path,
41 char *name, void *value, size_t size)
42{
43 int name_size = strlen(name) + 1;
44 if (strncmp(name, "user.virtfs.", 12) == 0) {
Aneesh Kumar K.V70fc55e2010-10-18 15:28:16 +053045
46 /* check if it is a mapped posix acl */
47 if (strncmp(name, "user.virtfs.system.posix_acl_", 29) == 0) {
48 /* adjust the name and size */
49 name += 12;
50 name_size -= 12;
51 } else {
52 /*
53 * Don't allow fetch of user.virtfs namesapce
54 * in case of mapped security
55 */
56 return 0;
57 }
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053058 }
59 if (!value) {
60 return name_size;
61 }
62
63 if (size < name_size) {
64 errno = ERANGE;
65 return -1;
66 }
67
Jim Meyering9238c202012-10-04 13:09:56 +020068 /* name_size includes the trailing NUL. */
69 memcpy(value, name, name_size);
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053070 return name_size;
71}
72
73static int mp_user_setxattr(FsContext *ctx, const char *path, const char *name,
74 void *value, size_t size, int flags)
75{
Chen Gang4fa4ce72014-03-02 01:36:19 +080076 char *buffer;
77 int ret;
78
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053079 if (strncmp(name, "user.virtfs.", 12) == 0) {
80 /*
81 * Don't allow fetch of user.virtfs namesapce
82 * in case of mapped security
83 */
84 errno = EACCES;
85 return -1;
86 }
Chen Gang4fa4ce72014-03-02 01:36:19 +080087 buffer = rpath(ctx, path);
88 ret = lsetxattr(buffer, name, value, size, flags);
89 g_free(buffer);
90 return ret;
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053091}
92
93static int mp_user_removexattr(FsContext *ctx,
94 const char *path, const char *name)
95{
Chen Gang4fa4ce72014-03-02 01:36:19 +080096 char *buffer;
97 int ret;
98
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +053099 if (strncmp(name, "user.virtfs.", 12) == 0) {
100 /*
101 * Don't allow fetch of user.virtfs namesapce
102 * in case of mapped security
103 */
104 errno = EACCES;
105 return -1;
106 }
Chen Gang4fa4ce72014-03-02 01:36:19 +0800107 buffer = rpath(ctx, path);
108 ret = lremovexattr(buffer, name);
109 g_free(buffer);
110 return ret;
Aneesh Kumar K.Vfc221182010-10-18 15:28:16 +0530111}
112
113XattrOperations mapped_user_xattr = {
114 .name = "user.",
115 .getxattr = mp_user_getxattr,
116 .setxattr = mp_user_setxattr,
117 .listxattr = mp_user_listxattr,
118 .removexattr = mp_user_removexattr,
119};
120
121XattrOperations passthrough_user_xattr = {
122 .name = "user.",
123 .getxattr = pt_getxattr,
124 .setxattr = pt_setxattr,
125 .listxattr = pt_listxattr,
126 .removexattr = pt_removexattr,
127};