linux/fs/ext3/xattr_trusted.c
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   1/*
   2 * linux/fs/ext3/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 "ext3.h"
   9#include "xattr.h"
  10
  11static size_t
  12ext3_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 size_t 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
  29static int
  30ext3_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 ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED,
  36                              name, buffer, size);
  37}
  38
  39static int
  40ext3_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 ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED, name,
  46                              value, size, flags);
  47}
  48
  49const struct xattr_handler ext3_xattr_trusted_handler = {
  50        .prefix = XATTR_TRUSTED_PREFIX,
  51        .list   = ext3_xattr_trusted_list,
  52        .get    = ext3_xattr_trusted_get,
  53        .set    = ext3_xattr_trusted_set,
  54};
  55
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