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Linux/fs/ext2/xattr_trusted.c

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  1 /*
  2  * linux/fs/ext2/xattr_trusted.c
  3  * Handler for trusted extended attributes.
  4  *
  5  * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
  6  */
  7 
  8 #include "ext2.h"
  9 #include "xattr.h"
 10 
 11 static size_t
 12 ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
 13                 const char *name, size_t name_len, int type)
 14 {
 15         const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
 16         const size_t total_len = prefix_len + name_len + 1;
 17 
 18         if (!capable(CAP_SYS_ADMIN))
 19                 return 0;
 20 
 21         if (list && total_len <= list_size) {
 22                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
 23                 memcpy(list+prefix_len, name, name_len);
 24                 list[prefix_len + name_len] = '\0';
 25         }
 26         return total_len;
 27 }
 28 
 29 static int
 30 ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
 31                 void *buffer, size_t size, int type)
 32 {
 33         if (strcmp(name, "") == 0)
 34                 return -EINVAL;
 35         return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
 36                               buffer, size);
 37 }
 38 
 39 static int
 40 ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
 41                 const void *value, size_t size, int flags, int type)
 42 {
 43         if (strcmp(name, "") == 0)
 44                 return -EINVAL;
 45         return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
 46                               value, size, flags);
 47 }
 48 
 49 const struct xattr_handler ext2_xattr_trusted_handler = {
 50         .prefix = XATTR_TRUSTED_PREFIX,
 51         .list   = ext2_xattr_trusted_list,
 52         .get    = ext2_xattr_trusted_get,
 53         .set    = ext2_xattr_trusted_set,
 54 };
 55 

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