1 #include "reiserfs.h"
2 #include <linux/capability.h>
3 #include <linux/errno.h>
4 #include <linux/fs.h>
5 #include <linux/pagemap.h>
6 #include <linux/xattr.h>
7 #include "xattr.h"
8 #include <asm/uaccess.h>
9
10 static int
trusted_get(struct dentry * dentry,const char * name,void * buffer,size_t size,int handler_flags)11 trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
12 int handler_flags)
13 {
14 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
15 return -EINVAL;
16
17 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
18 return -EPERM;
19
20 return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
21 }
22
23 static int
trusted_set(struct dentry * dentry,const char * name,const void * buffer,size_t size,int flags,int handler_flags)24 trusted_set(struct dentry *dentry, const char *name, const void *buffer,
25 size_t size, int flags, int handler_flags)
26 {
27 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
28 return -EINVAL;
29
30 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
31 return -EPERM;
32
33 return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
34 }
35
trusted_list(struct dentry * dentry,char * list,size_t list_size,const char * name,size_t name_len,int handler_flags)36 static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
37 const char *name, size_t name_len, int handler_flags)
38 {
39 const size_t len = name_len + 1;
40
41 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
42 return 0;
43
44 if (list && len <= list_size) {
45 memcpy(list, name, name_len);
46 list[name_len] = '\0';
47 }
48 return len;
49 }
50
51 const struct xattr_handler reiserfs_xattr_trusted_handler = {
52 .prefix = XATTR_TRUSTED_PREFIX,
53 .get = trusted_get,
54 .set = trusted_set,
55 .list = trusted_list,
56 };
57